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1
Salt Spray Test
Chamber Models:
S120/450/1000/2000iP
(Original Instructions)
Ascott Analytical Equipment Limited,
Unit 6 Gerard, Lichfield Road Industrial Estate, Tamworth, Staffs. B79 7UW Great Britain
Telephone: +44 (0) 1827 318040 Fax: +44 (0) 1827 318049 E-Mail: [email protected] Website: www.ascott-analytical.com
2
Contents
Part 1: Health and Safety
Part 2: Installation
Part 3: Operation
Part 4: Care & Maintenance
Part 5: Optional Accessories
3
Introduction - General Description
of machine operation
Part 1 - Health & Safety
1.1 Health and Safety Policy
1.2 Transporting and Lifting
Part 2 - Installation
2.1 Operating Environment
2.2 Positioning
2.3 External Services
2.3.1 External Utilities
2.3.1.1 Compressed Air Inlet
2.3.1.2 De-ionised Water Supply
2.3.1.3 Electrical Supply 2.3.1.4 Salt Solution Reservoir
2.3.1.5 Exhaust and Drains
2.3.1.5.1 Condensate Drain
2.3.1.5.2 Air Saturator Drain
2.3.1.5.3 Exhaust Vent to Atmosphere
2.3.1.5.4 Chamber Base Drain
2.4 Atomiser Set up
4
Part 3 - Operation
3.1 Help 3.1.1 Human Machine Interface (HMI) Screen
3.1.2 Contact Details
3.2 Set up
3.2.1 Initial Power Up – Ascott Main Menu
3.2.2 User Access
3.2.3 Settings – Supervisor Mode 3.2.3.1 Set Password
3.2.3.2 Set Holdback 3.2.3.3 Set Air Saturator Temp
3.2.3.4 Set Pump speeds (Vertical)
3.2.3.5 Set Purge Time
3.2.3.6 Disable Alarm Sounder
3.2.3.7 Calibration
3.2.3.8 Set Ramping
3.2.3.9 Power Fail Recovery
3.2.3.10 Set Test Type
3.2.3.11 Air Saturator Fill Method
3.2.3.12 Set Background Colour
5
3.3 Programming
3.3.1 Program Menu
3.3.2 Edit Program
3.3.2.1 Editing Program
3.3.2.2 Open Program
3.3.2.3 Step Number
3.3.2.4 Mode
3.3.2.5 Program Functions
3.3.2.6 Step Temperature Set Value
3.3.2.7 Step Time Set Value
3.3.2.8 Step Relative Humidity Set
3.3.2.9 Saving/Cancelling an Edited Program
3.3.2.10 Program Repeats
3.3.2.11 Save
3.3.2.12 Save as
3.3.3 Program View
3.3.4 Program Delete
3.3.5 Example CCT Program
6
3.4 Chamber Operation
3.4.1 Running a Program 3.4.1.1 Main Menu
3.4.1.2 Program Load
3.4.1.3 Program Run
3.4.1.4 Program Stop
3.4.1.5 Program Pause
3.4.1.6 Program Fast Forward
3.4.1.7 Run Settings
3.4.1.8 Trending
3.4.1.9 Total Chamber Hours
3.4.2 View Running Program 3.4.2.1 Step Number
3.4.2.2 Step Function
3.4.2.3 Step Temperature
3.4.2.4 Step Time
3.4.2.5 Step
3.4.2.6 Program Run Time
3.4.3 Canopy
3.4.4 Air Saturator Mode
3.4.5 Message Bar
3.4.6 Controls
3.4.6.1 Emergency Stop
3.4.6.2 Air Pressure Gauge & Regulator
3.4.6.3 Flow Meter(s) & Peristaltic Pump(s)
3.4.7 Setting Up Procedure
3.4.7.1 Determine the test parameters
3.4.7.2 Set up chamber
3.4.7.3 Set the Salt Fog Fallout Rate
3.4.8 Shut down procedure
7
3.5 Alarms 3.5.1 Alarm Status
Part 4 – Care & Maintenance
4.1 Routine Maintenance 4.1.1 Daily Checks
4.1.2 After Use
4.1.3 Weekly Maintenance
4.1.4 Three–Monthly Maintenance
4.2 Unscheduled Maintenance 4.2.1 Storage & Contamination
4.2.2 Deionised Water Inlet Filter
4.2.3 Clean or Unblock Salt Spray Atomiser
4.2.4 Maintenance & Replacement of Humidity sensor
4.3 Sample Daily Check Sheet
Part 5 – Fault Finding and
Problem Solving.
8
Introduction - General
Description of machine operation
The Salt Spray test (also know as a salt fog or salt mist) has been
the benchmark corrosion test in many industries for decades
The Ascott Salt Spray chambers (iS) meet the requirements of
basic, continuous salt spray tests conducted at a single
temperature only, such as ASTM B117 and similar international test
standards, and may be used with pH neutral salt solutions (NSS) or
those acidified by the addition of Acetic Acid (ASS) or Cupric Acid
(CASS).
Ascott Premium Salt Spray models (iP) can perform the same basic
salt spray tests, but in addition are equipped with extra features
which enable them to undertake ‘modified’ tests such as those
defined in ASTM G85. Here conventional salt spray is often
combined with one other climate, in a two-part cycle, to
accelerate the test. For example: salt spray and condensation
humidity (SWAAT) or salt spray and drying (PROHESION) or salt
spray and SO2 testing.
9
Part 1 - Health & Safety 1.1 Health and Safety Policy
The manufacturer is required to ensure, for reasons of Health and
Safety at Work that, as far as is reasonably practicable, the articles
which we design, produce and supply are as safe as possible and of
minimal risk to health.
We are required to provide information on the safety and handling
precautions to be observed when installing, operating and
maintaining our product. Such advice is contained in this manual.
We should also like to point out, however that you as users have an
important responsibility in the provision and maintenance of safe
working practices and conditions.
Accordingly we draw to your attention the following matters:
i. This apparatus should only be used as intended and within its
design parameters by suitably qualified and trained personnel
who have read and understood the relevant sections of this
manual.
ii This manual should be readily available to such personnel at all
times.
iii In addition to that which is written in the manual, normal
common-sense safety precautions must be taken at all times
to avoid the possibility of accidents.
iv Installation, maintenance and connection to electrical
supplies should only be carried out by suitably trained
personnel.
v. We would recommend that users produce their own risk
assessment for the entire testing process for which this
apparatus will be used.
vi. The normal operation noise levels for the chamber are shown
below and if they exceed these parameters then there is a
problem with the chamber. Please obtain advise from your
10
local agent / distributor or Ascott themselves to ascertain
problem. Some accessories may deviate from these levels.
Declared Dual-Number Noise Declaration
Manufacturer Ascott Analytical Equipment Ltd
Type Cyclic Corrosion Test Chambers (CC1000iP)
Declared Dual Number Noise Emission Values according to EN ISO 4871
A-Weighted Emission Sound Pressure Level at the Work Station
Measured value Lpa in decibels 51.59
Uncertainty Kpa in decibels 1.50
A-Weighted Emission Sound Power Level
Measured Value Lwa in Decibels 69.02
Uncertainty Kwa in decibels 1.50
The determination, declaration and verification of air bourne noise emission have been carried out in accordance with EN 14462 as required within clause 5.5.2 (Noise reduction at source at the design stage) of EN12921-1:2005+A1:2010.
Values determined according to the noise test code EN 14462 using the basic standards EN ISO 11201 (Grade 2) and EN ISO 3744.
vii. Training is available if required. Please contact Ascott or your
Agent / Distributor for more details.
viii. No specific PPE is required during standard operation of the
chamber as the chamber is designed to purge the
atmosphere before opening the canopy to the chamber
working area. Some accessories may require PPE to be worn.
All accessories that utilise sub zero temperatures will require
gloves to be worn when handling anything inside the
chamber. Accessory ACC46 – SO2 testing facility must follow
the instructions for the accessory as the atmosphere and bi
products can be extremely hazardous.
ix. Under no circumstances should anyone be inside the
chamber during operation or exposed to the corrosive
atmosphere of the chamber. All leaks must be reported and
11
repaired. Chamber must be isolated immediately if any
atmosphere or water leaks are detected.
x. No structural changes or fitting of customers own tools /
accessories without first contacting Ascott or its associates.
xi. In the event of a breakdown consult Ascott or its associates
immediately as further damage to the chamber and / or
personnel may occur.
xii. Ascott chambers will have the following safety labels attached
to the side panel work.
Warning people of potential electric shock.
Warning people of hot water, confined space and sharp edges.
xiii. The control panel also has two labels to identify the Air Pressure
Gauge for the chamber and the regulator for the air
12
supply.
Denotes Pressure Guage
Denotes Pressure Regulator
xiv. Inside the control compartment the earthing point of the
chamber is clearly identified with the following symbol
13
1.2 Transport and Lifting
i. Lifting of the chamber should only be done with a fork truck and lifted using the designated lifting points at the rear of the chamber. The lifting points are identified with the following logos
– ii. When transporting the chamber ensure it is locked and strapped
into position preferably chocked up off the castors using the chassis frame. No loads are to be put on the top. Drains must be emptied before loading.
14
Installation Manual
For Models:
S120/450/1000/2000iP
1
Part 2 – Installation
CAUTION
THE EQUIPMENT SHOULD ONLY BE INSTALLED BY SUITABLY QUALIFIED
PERSONNEL. DAMAGE CAUSED DUE TO INCORRECT INSTALLATION
WILL NOT BE COVERED BY THE WARRANTY.
2.1 Operating Environment
This equipment is designed for internal use only, in an environment
controlled to within the following limits:-
Storage
Ambient Temperature: +5 to +30°C (no icing)
Ambient Humidity: < 85% RH (no condensation)
Operation
Ambient Temperature: +18 to +23°C (no icing)
Ambient Humidity: <50% RH (no condensation)
Note: The minimum operating temperature achievable inside a basic
chamber (without accessories) will depend directly upon the actual
ambient temperature of the environment in which it is located
2
2.2 Positioning
Move the Cyclic Corrosion Test Chamber into position on a clear, clean
stable, level floor as shown:
Chamber
The rear castors can be locked
when the chamber has been
positioned.
(Not fitted to 120L chambers)
3
2.3 External Services
2.3.1 External Utilities
Note: All hoses and pipes up to 3 metres (10ft) in length, and the power cable are
supplied with the chamber.
Air Saturator Automatic Water
Inlet (De-ionised Water) 12.5 mm (½”)
bore hose Air Saturator Drain (No connection)
Compressed air inlet 12.5 mm (½”)
bore hose
2.3.1.1 Compressed Air Inlet
Note: The compressed air supply must be clean, dry and oil free. It must have a
minimum pressure of 4.0 bar (57 psi) and a maximum pressure of 6.0 bar (87 psi). Between
these pressures, the flow rate should be at least 75 litres per minute (2.6 cubic feet per
minute) equating to a free flow at atmospheric pressure of approximately 102 standard
litres per minute (3.6 standard cubic feet per minute).
(i). Connect the 12.5 mm (1/2”)bore air hose supplied, between the
air inlet at the rear of the chamber and the compressed air
supply. (See above).
2.3.1.2 De-ionised Water Supply
Note: The de-ionised water supply must have a minimum pressure of 0.5 bar (7PSI) and a
maximum of 5 bar (72PSI).
Connect the 12.5 mm (1/2”) bore water hose supplied, between the two water inlet hose connections at the rear
of the chamber and the de-ionised water supply. (See above).
4
2.3.1.3 Electrical Supply
We recommend this equipment is connected to an electrical supply
protected by a residual current device (earth leakage circuit breaker).
Before connecting this equipment to an electrical supply, check the
information given on the equipment rating plate and ensure that:
Your supply is Single phase A.C. (Alternating Current) of the stated
frequency with Neutral (If Fitted) nominally at Earth potential.
Your supply voltage is within the stated range.
The current rating is within the capacity of your supply outlet.
Your plug or outlet circuit is suitably fused.
Isolates the chamber from the
electricity supply.
5
WARNING: THIS APPARATUS MUST BE EARTHED
A rotary electrical isolator switch is mounted in a prominent position on the
chamber. This isolates the chamber from the incoming electrical supply (live
and neutral) when the switch is rotated to the '0' position, and can be
padlocked in this position if required. The electrical supply is connected when
this switch is rotated to the '1' position.
Resetable Thermal Over current trip
switches
2.3.1.4 Salt Solution Reservoir
(i). Position the Salt Solution Reservoir to the left of the chamber.
Salt Solution Reservoir – The side wall
has a hole to allow the salt solution
hose to pass through.
Salt solution inlet hose
6
(ii). Feed the end of the 6 mm salt solution hose that is fitted with a
filter, into the Salt Solution Reservoir ensuring that the filter unit lies
at the bottom of the reservoir.
2.3.1.5 Exhaust and Drains
2.3.1.5.1 Condensate Drain
7
Drain – 22 mm (7/8”) diameter
pipe
(i). Connect the 22 mm (7/8”) diameter push-fit pipe to the rear of
the chamber.
(ii). Connect the other end to the service drain.
2.3.1.5.2 Air Saturator Drain
Note: If chambers are left unused for any length of time it is recommended that the
air saturator is drained to prevent the build up of algae which could cause system
blockages or of bacteria which might present a potential health risk.
Air Saturator Drain
Do not connect anything to the Air
Saturator Drain; it is provided for
maintenance purposes only.
8
To drain when required:
Reduce the air pressure on the
control panel to zero. Then use a flat
blade screwdriver to open the drain
tap.
2.3.1.5.3 Exhaust Vent to Atmosphere
Exhaust –50mm (2”) diameter
pipe for all S chambers.
(i). Connect the exhaust pipe provided to the exhaust outlet to the
rear of the chamber.
(ii). If the length of the vent pipe route is greater than 5 metres, a
larger diameter pipe may be required.
(iii). Route the other end to outside atmosphere, maintaining a
straight run-up or run-down to avoid sags where condensate may
collect and cause backpressure.
9
2.3.1.5.4 Manual Base Drain
Drains the chamber completely.
With the tap handle in the vertical
(closed) position, salt fog
condensate will accumulate in the
chamber base to a predetermined
level, before draining to waste. This
assists in maintaining a high humidity
during testing, and is the correct
position for most continuous salt
spray tests.
With the tap handle in the horizontal
(open) position, salt fog condensate
will drain away. This drains the
chamber interior for cleaning.
2.4 Atomiser Set up
10
On 450L/1000L & 2000L chambers, the atomiser is mounted in a PVC
holder located on the rear wall of the chamber. It is locked into
position using plastic thumbscrews. Position and lock the atomiser so
that when atomising, the spray impacts in the centre of the inside of the
canopy viewing window when the canopy is closed. This position can
be adjusted to achieve even fallout results during salt spray testing.
11
On 120L chambers, the atomiser is mounted in a PVC holder located on
a sideways moveable mount. Position the atomiser so that when
atomising, the spray impacts in the sealing gasket between the canopy
and the GRP chamber, when the canopy is closed. This position can be
adjusted left to right to achieve even fallout results during salt spray
testing.
Note: Please see the care and maintenance section for details of how to remove
and maintain the atomiser.
12
Operation Manual
For Models:
S120/450/1000/2000iP
13
Part 3 – Operation
3.1 Help
3.1.1 Human Machine Interface (HMI) Screen
The chamber control system utilises a Human Machine Interface (HMI)
screen mounted in the chamber control panel. This operates in
conjunction with a Programmable Logic Controller (PLC) mounted within
the chamber. The HMI screen is touch sensitive and uses ‘virtual’ push
buttons for the selection of various functions.
Run Indicator
Illuminates green while the HMI
is powered and operating
correctly.
(Orange/red illumination
indicates a problem).
Display
Full colour VGA LCD screen
with backlight.
Screen Saver Mode
If the HMI is not touched for 10
minutes it will enter screen saver
mode to preserve the life of the
HMI, the chamber will continue
to function as normal. To
illuminate the HMI, simply touch
the roaming screen switch.
14
The HMI screen uses a menu driven format, where functions are
selected from a variety of ‘pop-up’ pages. Most ‘pop-up’ pages
usually have an (escape) button, located in the top right hand
corner.
Touching will return the
HMI display to the previous
page.
3.1.2 Contact Details
To access the chamber serial number, PLC/ HMI software revision
numbers and for Ascott contact details; touch the button or
touch the logo.
This page displays three pieces
of information required by an
Ascott engineer if contact with
Ascott is to be made. They
are:
Chamber serial number, PLC
software revision number and
HMI software revision number.
Touch the button to
return to the Main Menu page
shown above.
15
3.2 Set up
3.2.1 Initial Power Up – Ascott Main Menu
When the chamber is first switched on, after a few moments, the
following page will be displayed and after 20seconds an alarm will
sound.
Ascott Main Menu Page:
When operating the chamber,
repeatedly touch the
button to return to the Ascott
Main Menu page.
On start up alarm will start after
20 secs. Press the flashing
Alarm warning.
Then press the mute button to
silence.
Then hit the Esc button to
return to Main Menu.
16
3.2.2 User Access
The chamber has two operating modes, ‘Operator’ and ‘Supervisor’.
‘Supervisor’ mode allows access to an additional chamber settings
menu and is password protected
At the Ascott Main Menu Page, touching displays the following
page:
To enter the settings menu
available in ‘Supervisor’
mode a 4 digit code will
need to be entered. This is
default set to 1234 but can
be changed within the
Settings Menu.
Entering the 4 digit code displays the following page:
Pressing , all of the
test chamber settable
parameters can be viewed
and adjusted.
See ‘Settings-Supervisor
Mode’ below for details of
these parameters.
17
3.2.3 Settings – Supervisor Mode
The button will only be visible if the correct access code has
been input. See Access, above.
Note: In each Settings page touch to save the setting and exit
back to the supervisor ‘Settings Menu’.
Note: The settings that appear within this menu depend upon the optional
accessories (if any) ordered with the chamber.
At the Ascott ‘Main Menu’ Page, touching brings up the
following pages:
Settings Menu, Page 1
Touch to display page 2.
Settings Menu, Page 2
Touch to display page 1 settings.
Touch to display page 3.
18
These are global settings that apply to all programs and therefore need
only be set once.
Detailed descriptions for each setting follow.
3.2.3.1 Set Password
Touching brings up the following page:
Touch the button to
display a numeric keypad which
will enable a new password to be
entered and saved.
The current password is displayed in the left-hand window (factory set to
1234).
3.2.3.2 Set Holdback
Touching brings up the following page:
Settings Menu, Page 3
Touch to display page 2 settings.
19
H
o
l
d
b
a
c
k
Holdback creates a ‘tolerance band’ around the set value for
temperature. With holdback on, the program step timer will not start until
the temperature inside the chamber is within the tolerance band. A
HOLDBACK ON message will appear within the main run page and the
chamber will continue to function normally in this holdback state.
This function can be useful in providing a ‘guaranteed soak time’ at a
particular set temperature. However, if an unrealistically small tolerance
band is set, especially when the chamber has been programmed for
automatic temperature cycling, then the programmed step times might
easily be exceeded due to the effect of holdback.
3.2.3.3 Set Air Saturator Temp
This is the target set temperature for the air saturator.
Touching the button brings up the following page:
Touch the button to
activate/ deactivate the
holdback facility. To adjust the
holdback tolerance setting, touch
current value displayed on the
button to reveal a
numeric keypad, the new setting
can then be entered and saved..
To adjust the set value of the air
saturator, touch the current value
displayed in the button to
display a numeric keypad, the
new setting can then be entered
and saved. Refer to the test
standard being run for the air
saturator set value.
The maximum permitted set value
is 63C.
20
3.2.3.4 Set Pump speeds
Note: If a chamber is fitted with a Multi-Solution Salt Spray Facility (Optional accessory
ref.: ACC86) or Water Fog Humidity (optional accessory ref; ACC32) then the
instructions that follow for setting the Pump Speed(s) may change. Please refer to the
supplementary instructions, which will have been provided in the optional accessories
section at the back of this manual
This sets the speed of rotation of the peristaltic pump(s) in the usual salt
spray (vertically up) mode of operation. It is adjustable from 0-99%.
Increasing pump speed will increase the salt spray fall-out rates
collected inside the chamber and vice versa.
Depending on the size of test chamber, touching the
button will bring up one of the two following pages:
If a single pump is fitted:
To adjust the pump speed, press the
current value displayed in the
button, this will display a numeric
keypad where the new pump speed
can be entered and saved.
If two pumps are fitted (2000L) the
following page will be displayed.
Adjusting the pump speeds is the
same process as described
above.
Each pump speed can be
individually set to allow fallout to
be independently controlled from
left to right.
21
3.2.3.5 Set Purge Time
Touching the button will bring up the following page:
‘Normal’ purge time is the number
of seconds of air purging of the
chamber interior that will take
place automatically, if salt spray
or SO2 testing has occurred,
before the chamber canopy can
be opened.
Purge before function ‘3/7’ is the
number of seconds of air purging
of the chamber interior that will
take place automatically at the
beginning of function 3 (Wetting
)and function 7, Cooling
(optional accessory).
Both may be adjusted by touching
the value to show a numeric touch
pad, and then a new value can
be entered.
Touch to save the settings
and exit back to the supervisor
‘Settings Menu’.
Notes:
‘Normal’ purge time is factory set to 450 seconds. This can not be reduced but may be
increased if required.
Purge before function ‘3/7’ is factory set to 0 seconds. Users may decide that if a Wetting or
Cooling phase is programmed to follow a salt spray or SO2 phase, it may be desirable to
incorporate a period of air purging to minimise the salt spray/SO2 remaining in the chamber
atmosphere, before a Wetting or Cooling phase begins.
22
3.2.3.6 Disable Alarm Sounder
Touching the button will bring up the following
page:
If a chamber alarm condition
arises, a visual alarm indicator on
the control panel illuminates and
an audible alarm sounds.
Touching the ‘SOUNDER ENABLED’
button will enable/disable the
alarm sounder. The sounder is
factory set to on.
Touch to save the settings
and exit back to the supervisor
‘Settings Menu’.
Note: If the alarm sounder is switched off, the audible alarm will still sound when the
canopy is opened or closed. For safety reasons this cannot be disabled.
3.2.3.7 Calibration
Touching the button will bring up the following
page:
23
Note: Warning message and
touch to access Calibration
pages.
By reference to independent, calibrated temperature/humidity
measuring sensors, users can cross check and adjust chamber values
for the following parameters. One parameter is displayed on each
page and these can be scrolled to by touching the buttons:
Chamber temperature can be
offset by adding or subtracting °C
to the displayed value (result) To
do this, touch the or
‘press here’ buttons to
display a numeric key pad and
enter the required offset value.
Air saturator temperature can be
offset by adding or subtracting °C
to the displayed value (result). To
do this, touch the or
24
‘press here’ buttons to
display a numeric key pad and
enter the required offset value.
Chamber humidity can be offset
by adding or subtracting %RH to
the displayed value (result). To do
this, touch the or
‘press here’ buttons to
display a numeric key pad and
enter the required offset value.
Liquid Immersion (Fn6)
temperature can be offset by
adding or subtracting °C to the
displayed value (result). To do this,
touch the or
‘press here’ buttons to display a
numeric key pad and enter the
required offset value.
(Note; the maximum offset is 9.9.)
3.2.3.8 Set Ramping
Touching the button will bring up the following page:
25
Touching the button
will enable/disable the program
ramping facility within ‘main
programs’.
With ramping set to on, when a main program is run, programmed
changes in temperature and/or humidity set values will occur linearly over
the duration of the programmed step time (for all step times greater than
1 minute) i.e.; the temperature/humidity will ramp to the new set value(s).
With ramping set to off, when a main program is run, programmed
changes in temperature and/or humidity set values will occur as quickly
as the chamber is capable of achieving, over the duration of the
programmed step time.
Note: If any program step changes are required to occur linearly over time, then
ramping must be set to on. If all program step changes are required to occur as quickly
as possible, then ramping should be set to off as this will simplify programming and
maximise the number of function steps available per program.
3.2.3.9 Power Fail Recovery
Touching the button will bring up either of the
following pages, depending on how the chamber has been set up:
With power fail recovery mode set
to ; following
an interruption to the chamber
electrical supply, the chamber will
automatically continue any
running program from exactly the
same point in the program that it
was at when the electrical supply
was first interrupted. The total
hours counter will not have reset,
and will therefore accurately
26
reflect the total run time.
If power fail recovery mode is set
to ; following an
interruption to the chamber
electrical supply, the chamber will
automatically pause any running
program. The operator then has
the choice of continuing or
stopping the test.
Touching either of these buttons toggles the power fail recover mode
between and mode. Set as required.
3.2.3.10 Set Test Type
WARNING !
It is important that the following procedure is complied with to prevent
damage to the humidity sensor.
The chamber is fitted with an
automatic ‘air curtain’ which will
protect the humidity sensor with a jet
of compressed air during salt spray
testing with acidic solutions.
The humidity sensor does not
function when this is operational.
Touching brings up a menu with the following 4
choices;
27
Select the most appropriate
choice for the type of testing to be
undertaken. All but ‘Neutral Salt
Spray (NSS)’ testing will activate
the air curtain.
The humidity display icon changes
to show when this is active.
3.2.3.11 Air Saturator Fill Method
Note: This setting only applies to chambers fitted with the Manual Filling Air Saturator
Option (optional accessory ref.: ACC66). Please refer to the supplementary instructions,
which will have been provided in the optional accessories section at the back of this
manual.
Touching the button will bring up the following
page.
If the chamber is not connected
to a permanent supply of mains
pressure, de-ionised water and
the manual fill optional accessory
has been fitted, set to ‘manual’.
This will allow manual filling of the
air saturator.
28
3.2.3.12 Set Background Colour
Touching the button will bring up the following
page.
Adjust the background colour of
the HMI to your preference:
Press the buttons to scroll
through the palette of colours in
sequence. A reference number is
displayed for each colour.
Alternatively, match the screen
background to one of the more
commonly used canopy colours
by touching one of the coloured
buttons.
Touching will save the settings
and exit back to the supervisor
settings menu.
3.3 Programming
3.3.1 Program Menu
Note; at the end of this programming section, an example program has been included,
with step by step instructions on how to create it.
Touching brings up the following Program Menu page:
29
Touching allows the user
to edit an existing program, or
create a new program.
Touching allows the user to
view all the steps of an existing
program and their operating
sequence.
Touching allows the user
to delete an existing program.
3.3.2 Edit Program
3.3.2.1 Editing Program This allows the operator to edit a program in full. Here the operator can
edit all of the programmable parameters and number of cycle repeat
Touching opens up the following page:
From this page the user can
choose to edit a main, sub
or single line program.
The differences between
the program types are
detailed below.
30
i) Programs Main
A main program can comprise of a number of step functions or sub
programs, linked together in a sequence to form a test cycle. Each step
can have independent settings for temperature, time and where
applicable, relative humidity.
Up to 10 main programs, each comprising of up to 30 separate steps can
be stored.
Touching brings up the following page:
Scroll through the list of programs
using the buttons.
Highlight the program to be
edited by touching the
corresponding button. i.e.
. This will cause
the program number to flash
confirming that it has been
selected.
iii) Programs Single
A single program is used for operating a single function, at a single
steady state temperature, for a programmed period of time.
Up to 5 single programs, each comprising of 1 step can be stored.
Touching opens the following page:
31
Highlight the program to be
edited by touching the
corresponding button. i.e.
. This will cause
the program number to flash
confirming that it has been
selected.
3.3.2.2 Open Program
Once a Main or Single program type has been selected, touching
in any program edit page opens the following page:
This is the ‘program edit’ page,
where from here the complete
program can be written, the
following steps will guide an
operator through the process.
The actual buttons displayed will
depend upon the function
selected.
Touching opens the following page:
32
This page allows the program title
to be entered or amended.
Using letters and numbers the user
can name programs using up to
16 characters, including spaces.
The button must be
touched to confirm the new title.
Touching the button opens the following page:
The new title will be displayed in
the and
windows.
To create a program, follow the steps detailed below.
3.3.2.3 Step Number
A step is an individual programmable segment of a program. A main
program can be made of up to 30 steps. A sub program can be made
of up to 7 steps. A single program is made from a single step.
All programs start at step number 1.
Scroll through the program steps
using the buttons located
beneath the current step number
until the required step number is
displayed.
33
3.3.2.4 Mode
The function required to be run in each program step is displayed inside the
button.
Touching the button within the button brings up the following
page:
If editing or
these are the step function
choices.
Note: The page displayed in this table
represents a chamber with various
optional accessories fitted. The actual
buttons displayed will depend upon
which options have been fitted to the
chamber.
The above functions are described in detail below.
Once selected, the screen will automatically return the ‘program edit’
page.
34
3.3.2.5 Program Functions
Note; A selected function will be active during an entire program step.
i) Function Off.
If selected, no function will be active during this step of the program;
however a time can still be entered for the step. This can be used to
operate as a ‘delayed’ start to a test commencing.
ii) Conventional Salt Spray.
Note: If this chamber has been fitted with a Multi-Solution Salt Spray Facility (Optional
accessory ref.: ACC86) then these instructions may change. Please refer to the
supplementary instructions, which will have been provided at the back of this manual,
if this facility has been fitted.
During this mode of operation salt fog is sprayed directly up towards the
canopy window and dispersed so that it ‘falls-out’ uniformly inside the
chamber. The chamber relative humidity is not controlled during this
mode of operation.
Conventional Salt Spray has a maximum operating temperature of
+50C.
iii) Temperature Controlled Air Flushing
During this mode of operation fresh air drawn from outside the chamber
is continuously blown into the chamber via an air heater. Relative
humidity is uncontrolled and will depend largely upon the ambient
humidity of the room in which the chamber is located.
The chamber air temperature is adjustable from ambient up to +50C.
iv) Condensation Humidity / Wetting
At the start of this function, the base drain automatically opens to allow
any liquid accumulated to drain away. The chamber then fills the small
tank located in the bottom of the chamber with fresh water. Heat is
generated using the immersion heater positioned in the small tank in
35
the bottom of the chamber. Set temperatures of 10~15C above
ambient will ensure that high relative humidity levels of 95~100%RH are
achieved during this mode.
The chamber air temperature is adjustable from ambient up to +50C.
3.3.2.6 Step Temperature Set Value
This is the target set value for temperature to be achieved at the end of
the step time, for this particular step.
Touching the buttons within the button increases/
decreases the set temperature by 0.1C each time a button is touched.
Alternatively, for large value changes, touching brings up a
numeric key pad where larger values can be entered and saved.
3.3.2.7 Step Time Set Value
Step time is the duration of a program step. It can be set from 1 minute,
(Rapid Step) to 99 hours 59 minutes (Ramp/Dwell).
Touching the buttons of the button increases/ decreases the
step time by 1 minute each time a button is touched. Alternatively, for
large value changes, touching the button brings up a numeric
key pad where larger values can be entered and saved.
Note; A rapid step is a step that will take the actual chamber values of
temperature and humidity to the set values programmed within each
step as quickly as the chamber can physically manage. To program a
rapid step the time within that step must be set to 1 minute. This type of
step should be used when rapid conditional changes within the test
space are required.
36
3.3.2.9 Saving/Cancelling an Edited Program
Once a program has been edited, pressing brings up the following
page:
On this page, the number of
required program repeats (see
below) can be set, and the
program can be saved or
cancelled.
Touching the button will display the following page;
Touching will cancel the
‘SAVE AS’.
Touching will return to the ‘SAVE AS’ page.
3.3.2.10 Program Repeats
This is used to set the number of times a program is repeated. A setting of
0 means the program will run once only with no repeats. A setting of 99
means the program will repeat continuously. Any other setting means the
program will be repeated the set number of times.
For main programs, this is used to select the number of times an entire
program is to be repeated. For sub programs, this will determine the
number of times the sub program is repeated within a main program. For
single programs this can be used to extend the maximum duration of the
program, which would otherwise be limited to the 99 hours & 59 minutes
maximum step time. For example, if a single program duration of 250
37
hours is required; this could be achieved by setting a step time of 25 hours
and setting the number of program repeats to 9. ((1 x 25) + (9 x 25) = 250).
Touching brings up a numeric key pad where values can be
entered.
3.3.2.11 Save
Touching saves an edited program under its current program
number.
3.3.2.12 Save as
Touching gives the user the opportunity to save a previously
saved program under another program number, by bringing up the
following page:
The current program number will be
flashing. Touch the new program
number as required, which will then
start to flash confirming its selection;
touch to save the
program under this program
number.
3.3.3 Program View
This allows the operator to view a written program in full without risk of
making any changes. Here the operator can view all of the
programmable parameters and number of cycle repeats.
38
Touching in the Program Menu page brings up the following
page.
From this page the user can
choose whether to view a main,
sub or single line program.
The method for viewing a program is similar regardless of whether it is a
Main, Sub or Single program being deleted. An example of
how to view a Sub program follows.
Scroll through the list of programs
using the buttons.
Highlight the program to be
viewed by touching the
corresponding button. i.e.
. This will cause
the program number to flash.
Touch to display the page
shown below.
39
The selected program number
and title will be highlighted at the
top of the page.
This page shows the program
steps: 1 step for single programs,
up to 7 steps for sub programs,
and up to 30 steps for main
programs. For main and sub
programs, the view is spread over
more than 1 page, which can be
scrolled through by touching the
buttons.
3.3.4 Program Delete
This allows the operator to delete a written program in full.
Touching opens up the following page:
From this page the user can
choose whether to delete
a main, sub or single line
program.
The method for deleting a program is similar regardless of whether it is a
Main, Sub or Single program being deleted. An example of
how to delete a Main program follows.
Touching brings up the following page:
40
From this page redundant
programs can be deleted to make
space for creating new programs.
Scroll through the list of programs
using the buttons.
Highlight the program to be
deleted by touching the
corresponding button, ie;
.
This will cause the program
number to flash.
Touch to display the page
shown below;
The selected program number and
title will be highlighted at the top of
the page.
Touch to delete the highlighted program.
Touch to cancel program delete and return to the Program Menu page.
41
3.4 Chamber Operation 3.4.1 Running a Program 3.4.1.1 Main Menu
Touch the button to return to the ‘Main Menu’ page
‘Main Menu’ Page.
Touching opens the ‘Run’ page:
This is the page from which
programs are loaded, started,
monitored and paused/stopped.
The page has a ‘Message bar’,
above the row of buttons.
The page has an ‘Alarm Status
button’ below the row of buttons.
The page display mimics the programming page and is laid out in
a similar way. The actual page display may differ slightly from the page
shown above, depending upon the chamber model, its optional
accessories, and the type of program loaded.
Note: ‘XXXXXXXXX’ as shown above in the program number and title boxes
will be replaced by the number and name of the program when loaded.
As usual, touching the button will escape to the previous page.
42
3.4.1.2 Program Load
Touching opens the following page:
Here user first chooses the type of
program they wish to load; the
actual program can be selected
from the list previously created
during program edit.
If a program is running, a warning
message is displayed advising the
user that a program cannot be
loaded while a program is running.
Touch to clear message.
Scroll through the available
programs using the
buttons.
Highlight the program to be
loaded by touching the
corresponding button. I.E.
. This will cause
the program number to flash
confirming that it has been
selected.
43
Once a program has been selected press the page will revert
to the ‘Run’ page.
If the loaded program contains a
salt spray or SO2 step, the Message
Bar will indicate;
This allows limited access to the
Supervisor settings page for
determining the test type. Select
the appropriate type from the
choices given. See the instruction
manual section which covers
Supervisor settings for further
information.
3.4.1.3 Program Run
Touching will start the loaded program running, either from the
very beginning, or from the beginning of a program step selected via
the button (see below). Touching the button also zero’s
the Program Run Time counter.
Note: Programs should be run only with the canopy closed. However it is possible to
run a loaded program for up to 5 minutes with the canopy open, for test purposes.
3.4.1.4 Program Stop
Touching will stop the loaded program. Confirmation is required
because once a program is stopped it can only be restarted from the
beginning of the program. The program run time counter will also be
zeroed.
44
3.4.1.5 Program Pause
Touching will pause a running program. During program pause,
the button will flash continuously. Touching or once
more will allow the program to run again from the same point in the
program from when the pause button was first touched.
Note: During program pause, the step time counter and the program total run
time counter are also paused.
3.4.1.6 Program Fast Forward
This button will only appear if a program is stopped and not running.
Touching enables the user to fast forward to the program step of
their choice and start the program from there, rather than the very
beginning, if required.
3.4.1.7 Run Settings
Touching the button brings up the ‘Run Settings’ page.
This is the page from which some
chamber settings can be
checked or altered.
The page has a ‘Message bar’,
above the row of buttons.
The page has an ‘Alarm Status
button’ below the row of buttons.
Press or to return to the ‘Run’ page.
45
3.4.1.8 Trending
This facility allows the user to monitor the chamber temperature and
relative humidity against time, graphically.
Touching the button brings up the following page:
Touch to
view the temperature profile.
Touch to
view the relative humidity profile.
Touch to scroll the display
back/forward in 30 minute steps.
Touch to go to the
previous/next page of display
data.
This is a graphical representation of the set temperature/humidity
(dashed line) and actual temperature/humidity (solid line) against time.
Each page displays data logged over a 300 minute period of time.
The page displayed on first entering the Trending facility relates to the
current time. Previous pages of data can be viewed covering a total
time of 72 hours. Data over 72 hours old is continually discarded as new
data is logged.
Press to return to the ‘Run Settings’ page.
46
3.4.1.9 Total Chamber Hours Run
Touching the button brings up the following display.
This will display the total number of
hours the chamber has run and
can not be reset.
3.4.2 View Running Program
Touching the screen in this area allows the user to view the
program that is currently loaded.
Scroll through the program using
the buttons.
Touch to return to the ‘Run’ page.
47
3.4.2.1 Step Number
This shows the step number for the program step about to be run - if the
program has yet to be started, or the current step - if the program is
running.
3.4.2.2 Step Function
This shows the step function for the program step about to be run - if the
program has yet to be started, or the current step - if the program is
running.
3.4.2.3 Step Temperature
This shows the temperature set value (SV) and the temperature actual
value (PV) for the program step about to be run - if the program has yet
to be started, or the current step - if the program is running.
Touch to reveal the chamber PID control terms and
heat output.
3.4.2.4 Step Time
This shows the step time set (SV) and the step time elapsed (PV) for the
program step about to be run - if the program has yet to be started, or
the current step - if the program is running.
3.4.2.5 Step Humidity
48
This shows the humidity set value (SV) and the humidity actual value
(PV) for the program step about to be run - if the program has yet to be
started, or the current step - if the program is running.
Note: This will only appear if the step function is a humidity step.
Touch to reveal the
chamber PID control terms and
humidity output.
3.4.2.6 Program Run Time
This shows the total elapsed program run time in hours. Touching this
display will reveal any part hours elapsed as minutes, if required. Starting
a program will zero’s this timer.
3.4.3 Canopy
Touching the button in any page opens one of the following
pages:
If the canopy is closed and a
program is running, a warning
message is displayed advising the
user that the canopy can not be
opened while a program is
running. Touch to clear
message.
49
If the canopy is closed with no
program running, touch to
open. If no program with Salt spray
or SO2 has been run an alarm will
sound for a few seconds and then
the canopy will open
automatically.
Pressing or will close this
page.
If the canopy is closed with no
program running but a program
has been run with salt spray or
SO2 then the chamber will
automatically purge itself for a
minimum of 450 seconds
Once the purge is complete touch
to open; an alarm will sound
for a few seconds and then the
canopy will open automatically.
Pressing or will close this
page.
50
If the canopy is open touch and
hold to close. An alarm will
sound for a few seconds and then
the canopy will close. The
button must be held until the
canopy has fully closed.
Pressing or will close this
page.
3.4.4 Air Saturator Mode
Touching the button brings up the following page:
This page allows the user to select
if they wish the chamber air
saturator to be active or inactive.
Touch the required button to
select.
Press to return to the ‘Run Settings’ page.
In the mode of operation, compressed air for the salt spray
atomiser is bubbled through the chamber air saturator. This is the
factory set condition, since this is a requirement of most salt spray test
standards.
Note: the chamber will automatically revert to this mode whenever the
chamber power is switched off and back on again.
51
In air mode the air saturator is bypassed. This is the correct mode
for testing to ASTM G85, annex A5.
The run settings page button will display when the air saturator is
active and will display when it is inactive.
3.4.5 Message Bar
A message bar is provided where shown, this is used to display a range
of messages to the user, including alarms. In the context of running a
program, the message bar will display the message ‘Program
Completed’ when the running program and any repeats have been
completed.
For certain program types the
Message bar will also flash:
See the ‘Set Test Type’ section of
the manual for details.
3.4.6 Controls
3.4.6.1 Emergency Stop
52
Pressing the chamber emergency
stop button during canopy
opening or closing will ‘freeze’ the
canopy in its current position.
An audible alarm sounds. When the emergency stop button is returned
to its normal position, the HMI screen will return to the canopy
Open/Close screen.
3.4.6.2 Air Pressure Gauge & Regulator
Air Pressure Gauge and Regulator
These indicate and control the pressure of the compressed air supply to
the atomiser(s).
To adjust the air pressure:
(i). Pull out the regulator knob to unlock.
(ii). Rotate anticlockwise to decrease the pressure and clockwise to
increase it.
(iii). Push in the regulator knob to lock.
53
3.4.6.3 Flow Meter(s) & Peristaltic Pump(s)
Flow meters and Peristaltic
pumps
(2000L- pictured)
450L and 1000L chambers are fitted with one flow meter and one
peristaltic pump. 2000L chambers are fitted with two flow meters, and
two peristaltic pumps, one of each for each atomiser. The flow meter(s)
monitor the flow rate of salt solution from the reservoir to the atomiser(s).
The peristaltic pump(s) draw salt solution from the reservoir and pass it
to the atomiser(s).
3.4.7 Setting Up Procedure
3.4.7.1 Determine the test parameters
(i). Cyclic Corrosion Test to be performed.
(ii). Composition of the salt solution.
(iii). Atomiser air, dry/moist, heated/unheated.
(iv). Salt fog fall out rate.
(v). Test duration/number of cycles.
54
3.4.7.2 Set up chamber
(i). Ensure mains isolator is ON.
(ii). Load the test samples into the chamber.
(iii). Prepare the salt solution and transfer it to the salt solution
reservoir.
(iv). Ensure that the salt solution reservoir is connected to the
chamber.
(v). Ensure that the drain and exhaust are connected and not
blocked.
(vi). Load required test program.
(vii). Run the loaded test program.
(viii). Adjust the pressure regulator and/or the salt solution flow rate to
give the required salt fog fall-out rate.
3.4.7.3 Set the Salt Fog Fallout Rate
(Usually carried out in advance of testing of components)
The method for measuring the Salt Fog Fallout Rate is specified as being
a 100 mm-diameter funnel in conjunction with a measuring cylinder
graduated in millilitres. This procedure is used to collect salt fog fallout
at various points across the chamber workspace (no closer than 100
mm from the chamber walls or atomiser) for set periods of time.
From these measurements the average fog fallout rate and the spread
of the fog throughout the chamber can be determined.
Generally, the spread of the fog within the chamber is controlled by the
air pressure, and the density of the fog is controlled by the salt solution
flow rate.
With the atomiser positioned centrally in the chamber, increasing the air
pressure will tend to increase the salt fog fallout at the extremes of the
55
chamber, whilst decreasing the air pressure will tend to increase the
fallout in the centre of the chamber.
Increasing the salt solution flow rate will increase the salt fog fallout at
any point in the chamber, whilst decreasing the flow rate will reduce
the fallout at any point.
Only very small adjustments to the air pressure and flow rate should be
made at any one time, before rechecking the results.
(i). Set the air pressure to 1.4 bar (20 psi).
(ii). Set the initial flow rate so that the peak flow is approximately 10
to 15 ml/min. The ball in the flow meter will fluctuate up and
down with every half revolution of the peristaltic pump.
(iii). Adjust the air pressure to obtain an even spread of fog within the
chamber, regardless of the actual amount of fallout collected.
(iv). Adjust the flow rate to bring the fallout within the limits specified in
the test standard.
(v). Recheck the spread of the fog and repeat operations iii and iv
above until satisfactory.
3.4.8 Shut down procedure:
(i). Stop any running programs.
(ii). Switch electrical isolator to OFF.
3.5 Alarms
3.5.1 Alarm Status
Touching brings up the following page:
56
Touch to silence audible
warning
Touch to reset any
alarms that are no longer active
Touch to review alarms
history (see below).
This page will list any active alarms. Note that active alarms will sound an
audible warning unless this has been disabled (within supervisor settings).
A list of all possible alarm conditions and their meaning is given in the
care and maintenance section of this instruction manual.
Touching brings up the following page:
This page lists all of the
alarm conditions that have
occurred, together with
their frequency of
occurrence.
Press to return to the previous page.
57
Care &
Maintenance
Manual
for Models:
S120/450/1000/2000iP
58
Part 4 – Care And
Maintenance.
4.1 Routine Maintenance
Routine maintenance is recommended to keep the chamber in good
working order. The following maintenance is recommended for a
chamber that is in regular use.
4.1.1 Daily Checks
Record chamber variable parameters on the Daily Check Sheet. A
sample Daily Check Sheet is provided at the end of this manual.
Ensure drain is clear.
Ensure exhaust is clear.
4.1.2 After Use
Clean the chamber interior and canopy by washing with warm water
and mild detergent.
If the chamber is not going to be used for a period of one week or
longer, refer to section 9.1 for recommended storage instructions.
4.1.3 Weekly Maintenance
Atomiser ‘salt in’
Luer fitting
assembly
Atomiser Body & filter
spacer Atomiser Nozzle
Atomiser Cap
Salt Solution Inlet
Hose
Salt solution Filter
Housing (filter fitted) Plastic spacer
Compressed Air Inlet
Hose & Atomiser ‘air in’
Luer fitting assembly
59
1) Check that the chamber service connections are secure and are not
leaking.
2) Switch off the power supply to the chamber.
3) Withdraw the atomiser and filter assembly from its support, taking care
not to damage the two hose connections.
4) Check the salt solution filter material for discoloration.
5) Detach the compressed air inlet hose (BLACK) by rotating the collar of
the ‘air in’ fitting assembly anti clockwise.(See 9.4)
6) Unscrew the atomiser body and cap as a complete assembly, from
the salt solution filter housing. If the atomiser and cap are dirty or have
been giving poor fallout results, clean the atomiser.(See 9.4)
7) Withdraw the salt solution filter material from the salt solution filter
housing using tweezers.
8) Wash the filter material in warm water and mild detergent.
9) If the filter material is badly contaminated or damaged, discard it and
replace it with new filter material.
10) Reassemble the salt solution filter.
(1)
i. Roll the filter material into a
cylindrical shape and insert into
the filter housing (1&2).
ii. Screw the atomiser body, nozzle
and cap onto the filter housing
ensuring Re-attach the
compressed air inlet hose (3).
iii. Refit the atomiser and filter (2)
60
(3)
assembly onto its mount.
iv. Switch on the power supply to
the chamber.
4.1.4 Three–Monthly Maintenance
Change the silicone rubber tube of the peristaltic pump every three
months or earlier if it splits or becomes deformed with usage.
Replace the tube as follows:
(1)
i. Switch off the chamber.
ii. Release the two clamps that hold the
silicone rubber tube in the pump body
(1).
iii. Pull gently on end of silicone rubber tube,
whilst turning the pump roller clockwise
by hand, to withdraw the tube from the
pump (2).
iv. Unscrew the cap of the plastic
compression fitting on both ends of the
silicone tube (3).
v. Pull the two silicone tube ends out of the
compression fittings and retain the olive
and cap for re-use.
vi. Cut a length of new silicone rubber
tubing to exactly the same length as the
original tubing and fit the compression
fitting cap and olive to each end.
vii. Reconnect one end of the new tube to
(2)
(3)
61
(4)
the left compression fitting.
viii. Place the tube into the left clamp (4)
ix. Whilst turning the pump roller clockwise
by hand, feed the pipe under the pump
roller mechanism until the whole length
has been drawn correctly into the pump.
Ensure that the tube is not twisted or
stretched, and lies naturally in the pump.
x. Clamp the other end of the new tube
into the right clamp (5).
xi. Reconnect the remaining end of the new
tube to the right compression fitting (6).
xii. Restart pump, and release right clamp for
a few minutes to allow the silicone rubber
tubing to find its natural position.
(5)
(6)
62
4.2 Unscheduled Maintenance
4.2.1 Storage & Contamination
If the chamber is to stand unused for a period of more than one week,
or if contamination by algae growth is detected in the salt solution
reservoir, the following procedure is recommended:
i. Switch off the chamber.
ii. Drain the air saturator (refer to section 3.7).
iii. Discard any salt solution remaining in the reservoir.
iv. Clean the reservoir thoroughly.
v. Partly fill the reservoir with a biocidal sterilising agent solution and
replace the salt filter housing in the reservoir.
vi. Switch on the chamber and run it in the Salt Spray mode of
operation for approximately five minutes, with the canopy
closed. This will flush all the salt solution hoses and fittings with the
sterilising agent.
vii. Switch off the chamber and leave to stand until required for use.
viii. Discard the sterilising agent and clean the tank thoroughly.
ix. Refill the reservoir with salt water and run for approximately five
minutes to flush any remaining sterilising agent.
4.2.2 Deionised Water Inlet Filter
i. Detach deionised water supply hose from the bulkhead fitting at
the rear of the chamber.
i. Withdraw the wire mesh filter from inside the bulkhead fitting.
ii. Scrub the filter clean with a brush under running water, or replace
the filter.
iii. Re-insert the filter into the bulkhead fitting.
iv. Reconnect the deionised water supply.
63
4.2.3 Clean or Unblock Salt Spray Atomiser
Atomiser ‘salt in’ Luer
fitting assembly
Atomiser Body & filter
spacer
Atomiser Nozzle
Atomiser Cap
Salt Solution Inlet
Hose
Salt solution Filter
Housing (filter fitted) Plastic spacer
Compressed Air Inlet Hose &
Atomiser ‘air in’ Luer fitting
assembly
(1)
(2)
i. Open the chamber canopy
ii. Switch off the power supply to the
chamber.
iii. Withdraw the atomiser and filter
assembly from its support, taking
care not to damage the two hoses.
iv. Detach the compressed air inlet
Hose (1).
v. Unscrew the atomiser cap (2).
vi. Wash the atomiser cap in warm
running water.
vii. Unscrew the atomiser body, nozzle
and cap from the salt solution filter
housing.
viii. Wash the atomiser body and nozzle
in warm running water.
ix. If the nozzle is blocked, clear the
obstruction with fine wire. Take care
not to damage the cone.
Reassemble the Salt Spray Atomiser.
64
4.2.4 Maintenance & Replacement of Humidity
sensor
Sensor in normal position, within protective plastic sheath,
revealing only the tip of the sensor, to minimise the number
of water droplets running over the sensor.
The hose attachment supplies compressed air forming an
air curtain during acidic salt spray tests.
Filter cap – keep clean by rinsing with fresh water
periodically.
Protective plastic sheath removed to reveal entire humidity
sensor probe.
Filter cap unscrews from sensor to reveal electronic sensing
element inside.
This filter can be removed for cleaning or replacement. In
either case, the chamber must not be operated until the
filter has been correctly screwed back into position (finger
tight only).
The entire sensing probe can be removed from its
mounting if it is in need of replacement. It is held in place
by a locking ring, which needs to be rotated to release the
probe. Full fitting instructions are provided with
replacement probes.
65
4.3 Sample Daily Check Sheet
Daily Checks for Month: ……………………………
Day
Chamber
Temp (°C)
Air Saturator
Temp (°C)
Air
Pressure
(Bar)
Fallout
(ml/80cm²
/hour)
pH
of Fallout
Water
Conductivity
(µs)
%
Concentration
of Salt Solution
/Specific
Gravity
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
66
Part 5 – Fault Finding and
Problem Solving.
Technical Support and solutions to common
faults or problems can be found by logging on
line to Ascott’s Chamber Doctor application.
Access is free for the first 12 months from
receiving the chamber. Further access can be
obtained by contacting Ascott Technical
Support.
Silver and Gold Technical support packages,
where direct access to an Ascott engineer
after warranty periods expire can also be
purchased. Please contact Ascott Technical
Support for assistance on Tel: +44 1827 318040
or Fax +44 1827 318049