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DESCRIPTION
MANUAL
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SENTRYNET 3
CHEMICAL
FLOW CONTROLLER
User Manual
Contents
DESCRIPTION ............................................................................................ 4
FEATURES ................................................................................................... 4
SENTRY TYPES ............................................................................................ 13
Standard Sentry Control .............................................................. 13
Solar Pump Sentry Control .......................................................... 14
FLOW SETTINGS ......................................................................................... 15
K Factor .......................................................................................... 15
Pump Full Scale ............................................................................ 15
Accumulated Flow ...................................................................... 15
CONTROL SETTINGS ................................................................................. 16
Chemical Flowrate SetPoint [SP]................................................ 16
SP Entry ........................................................................................... 16
Pump Full Scale ............................................................................ 16
Control Failure Detection ............................................................ 16
GENERAL SETTINGS .................................................................................. 17
Averaging ...................................................................................... 17
Modbus Address ........................................................................... 17
Chemical Flow Units ..................................................................... 17
Product Flow Units ........................................................................ 18
Notes on Flow Units ...................................................................... 18
USER INTERFACE ....................................................................................... 19
Password Protection .................................................................... 19
Value Entry Types ......................................................................... 19
Numerical Value Entry Procedure ............................................. 19
CAUTION ................................................................................................... 22
MENUS ....................................................................................................... 22
Contents
DETECTING NO FLOW CONDITION ..................................................... 26
HANDLING NO FLOW CONDITION ..................................................... 26
CONTROL METHOD ................................................................................. 27
SYSTEM SETTINGS MENU ACCESS ........................................................... 29
SYSTEM SETTINGS DEFINITIONS ................................................................ 29
Setting Default Values ................................................................. 29
mA Trim .......................................................................................... 29
Input Options ................................................................................. 30
Baudrate & Parity ......................................................................... 30
Sentry Type .................................................................................... 30
Radio Configuration/Radio Diagnostics ................................... 30
DIGITAL COMMUNICATIONS .................................................................. 32
Physical Communication Methods ........................................... 32
Communications Protocol .......................................................... 32
WIRELESS MENUS ...................................................................................... 33
RADIO MENU ACCESS ............................................................................. 33
RADIO CONFIGURATION SETTINGS ....................................................... 33
Please fill-in the information below for tuture reference. .................. 38
IDENTIFICATION ........................................................................................ 38
FLOW SETTINGS ......................................................................................... 38
CONTROL SETTINGS ................................................................................. 38
GENERAL SETTINGS .................................................................................. 39
SYSTEM SETTINGS ...................................................................................... 39
Overview 1
P 4 / 40
DESCRIPTION
The SentryNet3 is a programmable flow monitor/controller, which maintains
chemical injection to a product flow stream at the desired rate.
The SentryNet3 controls the chemical flowrate in one of two modes: manual
or automatic. In manual mode, the output to the pump is fixed as a
percentage of the full-scale output of the chemical pump. In the automatic
mode, the flowrate is maintained at the desired setpoint by dynamically
controlling the output to the metering pump.
In automatic control mode, the flowrate setpoint may be entered manually
as a flowrate, or it can be calculated using measurements received from
external transmitters. Two optional 4-20mA transmitter inputs may be
connected: a product flow meter and a chemical analyzer. The product
flow meter measures the flowrate in the uncontrolled product flow stream.
The chemical analyzer indicates the amount of impurities in the product flow
stream. The SentryNet3 then maintains the chemical flowrate required to
neutralize the impurities in the product flow stream.
FEATURES
Controls, measures and displays flowrate from a variety of chemical flow
meters
Flow control based on user settable (manual) or dynamic flow setpoint
Flowrate K factor user settable from 1,000 to 120,000 pulses/gal
Convenient K factor calibration feature
Selectable flowrate units
Setpoints automatically calculated based on remote input signals
4-20mA and relay outputs for chemical feed pump control
Alarm relay output to indicate control failure
Display of chemical flowrate and totalizer
Modbus serial communication options: RS-485, RS-232, Wireless, Ethernet
Safety/failsafe features
Overview
P 5 / 40
Sent r y3Fl ow Cont r ol l er
Magnetic Switches(User Interface)
Chemical Flow MeterPump
Chem
ical A
dditiv
e
Antenna(Class 1 Div 1)
Pump Control:4-20mA and Pulse signals
Flowmeter Input
Product Flow
Product Flow Meter(Optional)
Analyzer(Optional)
Communications:ModbusWireless orRS-485
Power:10-30VDC
3/4 NPT CONDUIT FEEDTHROUGH HUBS Figure 1. SentryNet 3 external interfaces
Specifications 2
P 6 / 40
USER INTERFACE
Display 2 line x 16-character LCD with backlight.
User Interface 2 magnetic switches (activated through glass window)
COMMUNICATIONS
Modbus Selectable: RS-485, RS-232, Ethernet, Wireless: Non-
mesh radio, Mesh radio.
Standard COM settings: 9600,N,8,1
FLOWMETER INPUT
Pulses per sec 0 300. Flowrate fullscale depends on the flowmeter K
factor
mA INPUTS
2 x 4-20 mA inputs representing Product Flow and
Analyzer values to automatically set the flow control
setpoint.
CONTROL MODES
Auto Feed forward/feedback control method
Manual User sets control output value from 0 100%.
OUTPUTS / RELAYS
4-20mA and pulse outputs are simultaneously
available to maintain flow control
mA output 0.1% or 0.02mA resolution. Load resistance depends on
supplied power supply voltage.
Relays 2 SPST 3 Amp solid state relays. AC or DC type
available.
Specifications
P 7 / 40
Relay 1: No Flow condition / Loss of Control (normally
energized)
Relay 2: Pump output (solid state relay contacts). Max
pulses per second = 130.
POWER
Volts 10 30 Vdc
Current 130 mA max. @ 12 Vdc
65 mA max. @ 24 Vdc
MECHANICAL SPECIFICATIONS
Enclosure Explosion proof.
Weight 3.75 kg (8.25 lb)
3/4 NPT CONDUIT FEEDTHROUGH HUBS
Figure 2. Top view Figure 3. Front view
ENVIRONMENTAL SPECIFICATIONS
Operating Temp. -20 to 60 C.
Specifications
P 8 / 40
Relative Humidity 90% max. with no condensation.
Installation 3
P 9 / 40
IMPORTANT: Shut off power supply for the SentryNet3 prior to electrical hookup.
All SentryNet3 connections are located in the rear compartment of the
enclosure.
Figure 4. SentryNet3 connections (rear view)
+12
VDC
GN
D
GND
D+
D-
Power RS-485
+ - + - + - + - + - + - + - + -
Prod
uct
Fl
ow
Anal
yzer
mA In
Pum
p Co
ntro
l
mA Out
Not U
sed
Freq In
Flow
met
er
Not U
sed
Relays
Alar
m
Pum
,p
Contro
l
Startup 4
P 10 / 40
1. Apply power to the SentryNet3.
2. The initial splash screens will display the S/N and software revision.
3. The optional radio module will be checked. One of following
messages will be displayed:
4. If no radio module is installed:
5. If a meshing radio is installed:
6. If a non-meshing radio is installed:
Checking Radio
NonMesh Radio ok
Checking Radio
No Radio Found
Checking Radio
Meshing Radio ok
Startup
P 11 / 40
7. The main screen is displayed:
8. The top line shows the current chemical additive flowrate and the
setpoint (SP) in the selected flowrate units (quarts per day in the above
example).
9. The second line shows the control output in percent (%) and the
Control Mode: Man = Manual Control, Auto = Auto Control
10. There are three other data screens. Activate the A switch using the
magnet to scroll through each screen.
11. This screen shows the accumulated flow (volume) in the selected units.
The accumulated flow may be cleared at any time [see Configuration
section for details].
12. This screen shows the chemical flowrate. Two values are shown. The
Raw value is the internal flowrate used for control. The Avg value is
for display only it is the average of the last five Raw value readings
for a more stable reading.
13.
14. The final screen shows the setpoint (SP).
Chem Flow (QPD)
Avg 5.0 Raw 4.7
Chem Vol
7.8Qrt
5.0QPD SP 4.5
Out: 53.0% Man
Startup
P 12 / 40
Fixed = manually set by user via the magnetic switches.
Ext = set by external input. The value is calculated based on the
input value of Product Flow meter and/or the Analyzer.
The bottom line shows the SP in flowrate units, whether set
manually [Fixed] or by the Analyzer [Ext].
SP:Fixed
= 5 QPD
Definitions 5
P 13 / 40
SENTRY TYPES
There are two SentryNet3 types:
Solar Pump
Standard
The main difference between the two types is in the pump pulse control
signals.
The pump type selection is made in the Systems menu, which is not exposed
during field setup. Switching between the two types requires a change in
pumps.
Standard Sentry Control
The Standard SentryNet3 controls the pump by adjusting the strokes per
minute. The on-dwell time is determined by the maximum number of pulses
per minute programmed in the Pump Full Scale section of the Control
Settings menu.
Fixed Dwell [On Time]
1 minute
1 2 25
25 strokes/min@ 50% output
ExamplePump Full Scale = 50 strokes.minOutput = 50%
Figure 5. Standard SentyNet3 pump control pulses
Definitions
P 14 / 40
Solar Pump Sentry Control
The Solar Pump SentryNet3 controls the pump by adjusting the dwell time
over a fixed period. The fixed period is field settable. The maximum number
of strokes per minute is 6 and the maximum dwell time for each stroke is 3
seconds.
Variable Dwell1.5 seconds
@ 50% output
1 minute
1
4 strokes/minSet by Pump Full Scale
ExamplePump Full Scale = 4 strokes.minOutput = 50%Dwell time = 1.5 sec. Range = 0 to 3 sec (3 sec max. Dwell Time is fixed)
4
Figure 6. Solar SentryNet 3 pump control pulses
Definitions
P 15 / 40
FLOW SETTINGS
K Factor
The K factor is fixed by the flow meter. It is the number of pulses per gallon
generated by the chemical flowmeter. The SentryNet3 accepts values
between 1,000 to 120,000 pulses per gallon.
Although this value is set by the flow meter, the actual value in a particular
installation is affected by external influences such as pressure and fluid type
and so may be different than the value listed by the manufacturer. The
SentryNet3 allows K Factor calibration to trim the value for each application.
Pump Full Scale
This value is determined by the chemical pump. It equals the actual
maximum flowrate the pump is capable of in a particular installation. Factors
such as pressure can affect the pump full scale. The Pump FS value is used in
the automatic control mode to calculate the initial control output value
setting.
Accumulated Flow
The chemical output is totalized and saved by the SentryNet3. It is displayed
in the units selected and may be cleared at any time.
Definitions
P 16 / 40
CONTROL SETTINGS
Chemical Flowrate SetPoint [SP]
The SP is the desired chemical flowrate value to be maintained by the
SentryNet3 in the automatic control mode. It is either specified directly in the
selected flowrate units or it is automatically and dynamically set by data
from external transmitters: Product Flowmeter and/or Analyzer.
SP Entry
If neither a Product Flowmeter nor an Analyzer are configured, then the
SentryNet3 will prompt for the SP in the selected flow units e.g., Quarts per
Day (QPD).
If an Analyzer, but no Product Flowmeter is configured, then the SentryNet3
will:
Read the chemical addition ppm value from the Analyzer
Prompt for a fixed Product Flowrate value
Calculate the chemical flowrate SP: (ppm * Product
Flowrate)/1000,000
The entered Product Flowrate is assumed to be a contant.
If a Product Flow meter, but no Analyzer is configured, then the SentryNet3
will:
Prompt for a fixed chemical addition ppm value
Read the flowrate from the Product Flowmeter
Calculate the chemical flowrate SP: (ppm *
ProductFlowrate)/1000,000
Pump Full Scale
This value sets the maximum pump control output range in strokes per
minute. See the start of this section [SENTRYNET TYPES] for details.
Control Failure Detection
The SentryNet3 will activate a Control Failure alarm [activates Alarm Relay] if
the chemical flowrate (or Process Variable: PV) deviates from the SP by more
Definitions
P 17 / 40
than the Alarm Tolerance [entered in percent] for at least the Alarm Time
Delay. The Alarm Tolerance and Alarm Delay are field settable.
GENERAL SETTINGS
Averaging
Averaging is only used by the Standard SentryNet3.
The Standard SentryNet3 uses relatively high pump strokes, producing bursts
of pulses from the flowmeter. Averaging is used to smooth out the
calculated flowrate from the flowmeter pulses.
The Solar Pump version of the SentryNet3 counts pulses over the relatively
long pump stroke cycle [typically 1- 2 strokes per minute] and due to this
synchronization, is relatively immune from flow fluctuations.
Modbus Address
The SentryNet3 functions as a Modbus slave. It is accessible by an external
Modbus master via the following communication methods:
Wireless in a meshed network. An optional Meshing radio must be
installed.
Wireless in a non-meshed network. An optional non-meshing radio
must be installed.
RS-485
RS-232
Selection between the methods is via hardware configuration. In all cases, a
Modbus slave requires a unique Modbus Address to distinguish it from other
slaves in a communications network.
Chemical Flow Units
The chemical flowrate may be displayed in a number of units:
QPD (Quarts per Day)
LPD (Litres per Day)
GPD (Gallons per Day)
The accumulated flow units are automatically adjusted based on the
chemical flowrate units i.e., quarts, litres, gallons.
Definitions
P 18 / 40
Menu prompts will automatically use the selected units.
Product Flow Units
The Product flowrate may be displayed in a number of units:
GPD (Gallons per Day)
BPD (Barrels per Day)
Notes on Flow Units
The SentyNet3 uses GPD and gallons as primary units.
Flow and volume are converted to selected units such as LPD, QPD,
and BPD only for display and for value entry. Once a value, such as
the Setpoint, is entered in the selected units, it is converted and saved
as GPD. Flow and volume values in selected units are not held in
memory, but converted only when necessary.
All flow and volume related values acquired via Modbus (digital
communications/network) are in GPD or gallons, respectively.
User Interface 6
P 19 / 40
USER INTERFACE
Menu navigation and configuration are performed using two magnetically
activated switches labeled A and B.
In the text below, pressing a key refers to the following sequence of actions:
1. Start with the magnet at least one inch vertically above the desired
magnetic switch
2. Then bring the magnet straight down to touch the glass window to
activate the switch
3. After value entry, lift the magnet vertically up and away from the switch.
The above procedure ensures only the desired switch is activated.
The A key is typically used to select the next menu item while the B key is
used to confirm entry.
Password Protection
Configuration values are password protected against inadvertent
modifications.
Information may be viewed without restriction, but the password entry screen
is activated as soon as an attempt is made to change a value.
Value Entry Types
There are two kinds of value entries:
Numerical
Selection between multiple states
Numerical values may only be entered within an allowed range. If the value
is not within the range, the entered value is cleared to the minimum or the
maximum value is displayed and the entry procedure is restarted.
Numerical Value Entry Procedure
This procedure applies to the entry of all numerical values, including the
password.
User Interface
P 20 / 40
The current value is displayed and the cursor flashes over the most
significant digit.
To accept the value without making any changes, press and hold the
B key until the value entry screen is exited.
To change the current digit, press the A key repeatedly. The digit value
will increase to 9 then roll over to 0.
Press the B key to advance to the next digit.
Repeat the above two steps until all digits are set as desired.
If the entered value is not within the allowed limits, the entered value is
cleared and value entry is restarted.
M
en
u O
vervie
w
7
P 2
1 / 4
0
From
an
y o
f the
Disp
lay sc
ree
ns, p
ress a
nd
ho
ld th
e A
ke
y fo
r 3 se
c. to
en
ter
the
Se
tting
s scre
en
s.
A AA
Hold for 3 Seconds Main Menu
General Settings
Averaging
Modbus Address
B
Chem Flow Units
Product Flow units
Exit
A
A
A
A
Main MenuControl Settings
SetPoint
Pump FS
A
B
Control Fail Set
Exit
A
A
Main MenuFlow Settings
K-Factor
K-Factor Trim
A
B
Chem Flow FS
Exit
A
A
A
A
Main Display Screen
Chem Volume
Chem Flow
A
SetPointValue
B
ControlMode:Man
B
B
B
BSet Out%
A
ControlMode:Auto
B
AB
B
B
Clear Accum Flow
A
B
SentryNet 3 Programming Menu Flow Chart
A
A
A
Main MenuDiagnosticA
Pulses: Freq:
Pulse/StrkCount/strk
B
PFlow%Analyzer%
Exit
A MainMenuExit
B
A
B
Configuration 8
P 22 / 40
CAUTION
This section assumes the reader has read through the Definition section.
Only qualified personnel should attempt to modify the configuration values.
Improper settings can cause instrument failure and/or damage.
MENUS
The configuration setting flowcharts are detailed in the following pages. They
should be used in conjunction with the Definitions and User Interface sections.
C
onfig
uratio
n
P 2
3 / 4
0 "A" to toggle up and "B" to accept move to next digit
Flow SettingsMain Menu
Flow Settings
B
To Determine this value operate the pump at 100% output and use value displayed
after system is stable. The units QPD,LPD,or GPD are set in the General
Settings Menu
The number of pulses per gallon generated by the chemical flow meter. This number can be manually set or determined
by following the proceedure in the K-Factor Trim section below
Flow Settings K-Factor:
Flow SettingsK-Factor Trim
A
A
K-Factor:pls/gal13900
B
K Trim: Test mL =10
B
B B K Trim: Out %=0
K Trim: ReadyB=YesB
K Trim: PumpingPumped: 0mL B
Flow SettingsChem Flow FS
Flow SettingsExit
A
Flow SettingsClear Accum
Flow
A
B Chem Flow FS: QPD100 B
B Clear Total FlowB=Clear B
B=Flow DonePumped: XXXX
K Trim: Real mL=XXXX BB
B
B
See expanded explaination in manual under Chemical meter calibration
Used to reset the total volume of chemical
pumped to zero
C
onfig
uratio
n
P 2
4 / 4
0
This paramater only pertains to pumps driven
by the relay output-settings can be from 1 to
120
This value can be entered manually or calculated by the Sentry based on the
analog inputs. The units of volume are determined by
a setting in the General Settings Menu
Control Settings
The default allows the actual flow rate to be over or under the current Set
Point by 25% for 60 seconds before triggering
analarm
Main MenuControl Settings
Control SettingsSet Point
Control SettingsPump FS
A
Control SettingsControl Fail Set
A
A
Set Point: QPD4
B
PMP FS: Strks/Min10
B
B B
Control SettingsExit
B Cont Fail:Tolrnc%: 25 BCont Fail:Delay
sec: 60 B
B
B
"A" to toggle up and "B" to accept move to next digit
C
onfig
uratio
n
P 2
5 / 4
0
The number of pulse counts required to update
the display and control functions
They unquie number address for this unit if on a communication network. Number between 1 and
255
The units of volume desired for displaying
chemical totals and flow rate. QPD-LPD-GPD use
A to toggle
The units of volume desired for displaying product flow rate. BPD-GPD use A to toggle
General SettingsMain Menu
General Settings
B
General SettingsAveraging
General SettingsModbus Address
A
General SettingsChem Flow Units
A
A
500B
255
B
B B
General SettingsProd Flow Units
A
B Chem Flow: QPDSet to: QPD B
B Prod Flow: BPDSet to: BPD
B
General SettingsExit
B"A" to toggle up and "B" to accept move to next digit
Reference 9
P 26 / 40
This section describes features and utilities of the SentryNet3 not detailed in
the previous sections.
DETECTING NO FLOW CONDITION
If flowmeter pulses are not received for two minutes, then a No Flow
condition is flagged.
If a No Flow condition is active when Chemical flowrate is required, then a
No Flow Alarm is activated.
Note: Chemical flowrate is required when the control mode is in the Auto
mode and the Chemical flowrate is not at the desired Setpoint.
HANDLING NO FLOW CONDITION
This feature is always turned on and is not selectable.
When a No Flow Alarm or Control Failure (See Control Definitions section) is
first detected, the control output value is captured and saved. The pump
control output is slowly ramped up to try and revive the pump. If this action
does not succeed, then the output is forced to and maintained at the
previously captured output. Here are the details:
In the event of a pump not working, or temporarily stalled (?), the SentryNet3
will detect a No Flow Alarm or a Control Failure. At this point, the following
sequence is initiated:
1. The current control output value is stored i.e., pump on at 45%
2. Every 30 seconds, the pump output is ramped upward in an effort to bring
the flow back from 0.
3. If there is still no flow for 2 minutes, then the output is forced to the stored
value recorded when the No Flow condition was first detected.
4. A No Flow alarm is now latched: the Alarm Relay is activated. A latched
condition can only be reset by cycling the power to the SentryNet3.
5. The control mode is left in AUTO mode.
Reference
P 27 / 40
CONTROL METHOD
The SentryNet3 maintains the chemical flowrate to the desired Setpoint by
pump control.
If the Setpoint changes (see below) by more than 5%, then the pump output
is recalculated (see below). If not, then the output is gradually ramped up or
down to maintain the desired chemical flowrate Setpoint.
Setpoint changes may be made either in static mode by the user or
dynamically by an external Product flowmeter / Analyzer (See Control
Definitions section).
The pump output is recalculated based on the pump fullscale (Chem Flow
Fullscale see Flow Definitions section) and the desired Setpoint.
Pump output percent = 100 * (Setpoint/Chem Flow Fullscale)
D
iagn
ostics
10
P 2
8 / 4
0
Se
e th
e M
en
u O
ve
rvie
w se
ctio
n o
n h
ow
to g
et to
the
Dia
gn
ostic
s scre
en
.
Diagnostics Menu
All Items in this menu are read only and are
displayed for information and troubleshooting
purposes.
This item is only displayed when the Sunpump type is selected in the Sentry Type item in the System
Settings Menu
This item only appears when either a product flow meter and/or analyzer is selected in the Input Options item in the system settings menu. Only the
activated input(s) will display
Main MenuDiagnostics
DiagnosticsPulses:Freq:
DiagnosticsPulses/Stroke:Counts/Stroke:
A
DiagnosticsProd Flow %:Analyzer %:
A
A
DiagnosticsExit
B
B
"A" to toggle up and "B" to accept move to next digit
Displays pulses accumulated this cycle and the frequency of the last cycle of
pulses-this will "roll over" at the number of pulses set in the Averaging setting of
the General menu
System Settings 11
P 29 / 40
WARNING
SentryNet3 System settings are not available for field modification. They affect fundamental parameters, which must only be modified by qualified users.
See the end of this section for the Systems Settings menu flowchart.
SYSTEM SETTINGS MENU ACCESS
1. From any of the Display screens, press and hold the A key for 3 seconds to
enter the Flow Settings screen.
2. Press the A key two times to display the General Settings screen option.
3. Press the B key to enter the General Settings screen.
4. Press the A key repeatedly to display the General Settings Exit screen.
5. Press and hold the B key for 3 seconds at the General Settings Exit screen
to display the hidden System Settings screen.
SYSTEM SETTINGS DEFINITIONS
Setting Default Values
This setting forces factory default values to Flow, Control, General, and
System settings. These values will overwrite existing values so Setting Defaults
must be used with caution.
mA Trim
This procedure is performed once at the factory and is not typically required
to be performed again.
The mA output is affected by electronic component tolerances. This
procedure trims the mA output by calculating the correction factor. The
SentryNet3 will force the output to 20 mA. The user must measure the actual
output using a mA meter and enter this value. The SentryNet3 will then
calculate the new correction factor.
System Settings
P 30 / 40
For example, 19.85 mA may actually be measured instead of 20. If you enter
this value at the prompt, the SentryNet3 will recalculate the mA trim.
Input Options
See Chemical Flowrate Setpoint definition in the Control Settings Definitions
section.
This menu sets whether or not a Product Flowmeter and or Analyzer is
connected to the SentryNet3. These external devices affect how the
chemical flowrate Setpoint value is calculated.
Baudrate & Parity
Baudrate and parity are settings used for digital communications.
This menu is used only if a radio module is not installed. Radios use fixed
baudrate and parity values.
Sentry Type
See Sentry Types in the Definitions section. Either the Solar Pump or Standard
SentryNet3 may be selected. This setting must be matched by application
hardware such as pump types and should not be changed unless the
hardware is compatible.
Radio Configuration/Radio Diagnostics
These menus are only available if a radio module is detected. See the Radio
section for details.
Syste
m S
ettings
P 3
1 / 4
0
System Settings Without RadioMain Menu
System Settings
System SettingsSet Defaults
System SettingsTrim mA Output
A
System SettingsInput Options
System SettingsExit
A
A
Set DefaultsA=Abort B=OK
B
Trim mA OutmA=20.00
B
B B
System SettingsBaud Rate/Parity
A
BInput Options
Prod Flowmetr=No B
BBaud Rate/Parity
Baud=9600 B
System SettingsSentry Type
A
Baud Rate/ParityParity=None B
Input OptionsSentry=Standard
Input OptionsAnalyzer=No B
B B
B
B
"A" to toggle up and "B" to accept move to next digit
Used to set unit to factory defaults
Used to adjust the SN3's 4 to 20mA output for fine
tuning with field equipment
Used to select the type of input that is to be used as
a pacing source
Used to set the baud rate and parity of the
communications port-this will not be visible if the
SN3 detects an on board radio
Used to set the operation mode
Communications 12
P 32 / 40
DIGITAL COMMUNICATIONS
Digital communication requires two independent specifications:
Physical communication method
Communications protocol
For example, in a telephone conversation, the physical communication
method is the telephone system, and the protocol is the language spoken.
One physical method may support many protocols and vice versa.
Physical Communication Methods
The SentryNet3 supports the following physical communication methods:
RS-232 (3 wire: Transmit, Receive, Ground)
RS-485 (3 wire: D+, D-, Ground)
Ethernet (wired)
Wi-Fi (wireless Ethernet)
Non-mesh Radio (transparent or wire replacement mode)
Mesh Radio (multiple SentryNet3 units route messages in a wireless
network).
Communications Protocol
The SentryNet3 supports the Modbus protocol. Modbus is a Master Slave
protocol where there is a single network master and multiple network slaves.
Slaves and master are connected in a network using one of the physical
communiation methods listed above. Slaves only reply when queried by the
master.
The SentryNet3 is a Modbus slave.
Each SentryNet3 on a network must have a unique number called a Modbus
Address. This address must be set prior to connecting a SentryNet3 to a
network. Multiple SentryNet3s with the same Modbus Address will cause
communication errors.
Wireless Radio 13
P 33 / 40
WARNING
A radio module must be installed to enable wireless communications.
Radio configuration values are intended to be fixed for most applications. Changes must be made throughout the network and NOT on an individual basis.
WIRELESS MENUS
There are two radio menus:
Radio Configuration Settings [see warning above]
Radio Diagnostics [these are for display only]
RADIO MENU ACCESS
The two radio menus are the final 2 entries in System Settings. See the
flowchart below. The radio menus are only visible if a radio module is
installed.
RADIO CONFIGURATION SETTINGS
Parameter Description Value
PL Transmit Power Level.
0 = 1 mW
1 = 10 mW
2 = 100 mW
3 = 500 mW
4 = 1 W
4
DH Destination High Address
This is only required for mesh radio applications.
The value must match the Source High Address of the Modbus
master
varies
DL Destination Low Address
This is only required for mesh radio applications.
The value must match the Source Low Address of the Modbus
master
varies
HP Hopping Channel 3
ID Network ID 1222
NH Network Hops
Sets the maximum number of hops expected in a network route
7
Wireless Radio
P 34 / 40
NN Network Delay Slots 3
NQ Network Route Requests 3
NR Network Retries 1
W
ireless
Radio
P 3
5 / 4
0
System Settings With Meshing RadioMain Menu
System Settings
System SettingsSet Defaults
System SettingsTrim mA Output
A
System SettingsInput Options
System SettingsExit
A
A
Set DefaultsA=Abort B=OKB
Trim mA OutmA=20.00
B
B B
A
B Input OptionsProd Flowmetr=No B
BSystem Settings
Sentry Type
A
BInput OptionsSentry=Standard
Input OptionsAnalyzer=No B
B
B
B
"A" to toggle up and "B" to accept move to next digit
Used to set unit to factory defaults
Used to adjust the SN3's 4 to 20mA output for fine
tuning with field equipment-see manual for
proceedureUsed to select the type of input that is to be used as
a pacing source
Used to set the operation mode
System SettingsRadio Config B
System SettingsRadio Diag
A
See:Mesh Radio Config page
VB:0:00 Temp:00RSS: 0
GD: 0 ER: 0 TR: 0
HV:0000 VR:0000 SH:00000000SL:00000000 A
A
A A A A
W
ireless
Radio
P 3
6 / 4
0
Meshing Radio Config PageSystem Settings
Radio Config
Radio ConfigSet Defaults
Radio:Dest AddrDH:00000000
A
Radio:Dest AddrDL:00000000
Radio:Net HopsNH:07
A
A
Set DefaultsA=Abort B=OKB B
B
A
B
B
BRadio:Tx Pwr LvlPL:4
A
B
B
B
B
"A" to toggle up and "B" to accept move to next digit
Radio:Hopping ChHP:3
B
Radio:Net AddrID:1222
Radio:Net delNN:03
Radio:Net Rt Req
NQ:03
Radio:Net RetryNR:01
Radio:Diag Freq003
A
A
A
A
A
A
A
A
A
A
B
Troubleshooting 14
P 37 / 40
CONDITION REMEDY 1.
2.
Settings Sheets 15
P 38 / 40
Please fill-in the information below for tuture reference.
IDENTIFICATION
Checked by
Model Number
Serial Number
Hardware Rev.
Software Rev.
FLOW SETTINGS
PARAMETER DESCRIPTION FACTORY
SETTING
USER
SETTING
K Factor Flowmeter output: pulses per gallon 13,900
Chem Flow Full
Scale
Maximum flowrate capability of the
chemical addition pump
25 (GPD)
CONTROL SETTINGS
PARAMETER DESCRIPTION FACTORY
SETTING
USER
SETTING
Control Mode Automatic or Manual [Fixed] Manual
SetPoint [SP] Desired chemical flowrate 1.0 (GPD)
Pump Full Scale Maximum pump output range in strokes per
minute
30 strks/min
Alarm Tolerance Control Failure Detection: The SentryNet3 will
activate a Control Failure alarm if the
chemical flowrate [or Process Variable: PV]
deviates from the SP by more than the Alarm
25 %
Settings Sheets
P 39 / 40
Tolerance [entered in percent] for at least
the Alarm Timedelay
Alarm Delay See Alarm Tolerance 60 sec.
GENERAL SETTINGS
PARAMETER DESCRIPTION FACTORY
SETTING
USER
SETTING
Averaging Only used by the Standard SentryNet3 [not
the Solar Pump version]. The number of
samples per average to smoothen out the
calculated chemical flowrate
500
Modbus
Average
Unique Network Address for each slave
device in a Modbus network
1
Chemical
Flowrate units
Chemical flowrate units used for display, and
configuration [e.g. entering the SetPoint]
QPD
Product Flowrate
Units
Product flowrate units used for setting the
SetPoint.
BPD
SYSTEM SETTINGS
PARAMETER DESCRIPTION FACTORY
SETTING
USER
SETTING
Input Options Product Flowmeter Installed
Analyzer installed
No
No
SentryNet3 Type Standard or Solar Pump version Standard
Comm Settings Baud rate
Parity
9600
None
Product Flowrate
Units
Product flowrate units used for setting the
SetPoint.
BPD
Contacts 16
P 40 / 40
For additional technical support, contact:
(Provide physical address, email, phone and fax number)