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Loop Checking and Field Instrument Testing ProcedureCategory: Implementation Loop Analysis Loop Performance UsabilitySubmitted by Katherine Bonfante on Thu, 10/04/2012 - 10:00Everybody knows that loop checking and field instrument testing is the last piece of the puzzle in each project before commencing the commissioning of any system. It is time-consuming and depends upon the completion of other systems like piping, electrical equipment, control valves etc.

Each contractor or company has its own procedure and common practices for instrument loop checking and functional testing. I found this forum is good place to discuss this topic in more detail, for example:

1. Can we have a common or guide line procedure for loop checking?

2. Can we illustrate all the required drawings, specification and forms required for loop checking?

3. Can we build a flow chart for loop checking which illustrates the rule of operation, maintenance, engineering and inspection for example?

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Comments Submitted by santhiraj sathanna on Fri, 09/06/2013 - 08:58

This is a very good topic for discussion.

We do the following in our organisation

1.A detailed loop check format is prepared for each project 2.Above is based on latest I/O list , P&ID and process narrative. 3.For each I/O point, all connected details/elements like PLC/DCS I/O module,Panel Terminal Block, Marshalling panel Terminal Block, Junction Box Terminal Block,Instrument/Final Control element tag, Service description,calibration range,cable tag.... 4.We do this testing by involving owner's as well as prime EPC bidder's Engineer as witnesses. After successful completion, the document gets signed by them.

We follow the same procedure for commissioning the logic as well as to demonstrate the same to end user!

This is time consuming and we do it religiously to eliminate last minute surprises.

Reply Submitted by on Tue, 10/29/2013 - 12:24

I fully agree with all 3 points. A guide is really needed. I takes much time to get agreed such procedure in every new project and a unified approach would be very effective here. To the second point I may add that a list of such documents would be very useful as well to avoid creating of a huge dossier and got all needed papers in place. Templates for certificates would be fine. As to the third point I'd a recommended list of personal of performing and witnessing parties. Mikhail Aravin, Senoir Instrument Commissioning Engineer.

Reply Submitted by Edward Smigo on Fri, 12/27/2013 - 10:45

The loop testing procedure can vary depending on the instrumentation and I/O infrastructure. A foundation fieldbus or Profibus PA based system would be different from a system using conventional or HART instrumentation on a system with HART I/O cards.

While one can perform a loop test with a handheld communicator when HART I/O is not present on the automation system that process would require multiple people similar to performing loop tests with conventional instruments. One benefit HART instrumentation has over conventional is the non intrusive nature of the testing. One does not need to break the loop to insert a mA simulator. HART instruments have a Loop Test method that allows the tester to drive the mA output of the instrument from a hand held communicator or an Asset Management Software application, When using Asset Management software, testing can be done more efficiently because a single person can be commanding devices from one window and observing results on another. An additional benefit when using Asset Management software is that multiple instruments can be put into loop test simutaneously which allows one to incorporate interlock logic checks along with the loop tests which further streamlines the comissioning process.

Since loop tests are often the final step before start-up, and projects schedules often slip, there is always pressure on the loop testing team to gain efficiencies to pull in the plant startup milestone.

Reply Submitted by Tom Dotts on Tue, 12/30/2014 - 08:30

Unfortunately, even today's large manufacturers have lost qualified process control specialists and engineers, leaving sometimes, unqualified personnel to decide how a "system" should be validated. A systematic approach is necessary and a legitimate step towards ensuring the "completeness" of even the smallest of project, upgrade or change to or within a BPCS or SIS on the plant floor. Of course regulations apply to safeties, but many times the even the fundamentals of instrumentation go unchecked and now become a liability. Standardization is needed - especially within chemical and petro-chemical applications. T.Dotts, Contract EI&C Technician / Project manager.

Reply Submitted by Charles Palmer on Wed, 01/14/2015 - 03:23

I would like to share some perspectives : Loop testing and plant commissioning done in-house is one aspect. Naturally the requirement for policies and procedures is mandatory ( as in both cases) Things change slightly when this work is been done under contract by a 3rd party. Once again the policies and procedures are required. FAT and SAT procedures should be issued to the supplier/contractor within 30 days of contract signature. As a Consultant, I have witnessed so many poor FAT and SAT company procedures in many different countries ( Cultures if you like). This has compounded poor FAT testing into total SAT failures as the fault could not be isolated to Panel or Field . Many hours could have been saved if the bookwork had been done up front.

Reply Submitted by Sankar Kumar R on Tue, 02/24/2015 - 03:43

I would like to summarize the requirement prior to start the loop check activity as follows:

1. SAT of DCS/ESD/F&G and IAMS system shall be completed and ready with all pre-requisites completed. 2. Total IO's shall be divided into loops & Loop Folder shall be prepared and approved from PMC/Client. 3. Loop folder shall contain the following documents as a minimum : a) Loop test record format (To enter the details of the Instrument subjected to loop check and the master instrument used). b) Instrument Data sheet(s) related with the loop. c) P&ID sheet related to the Instrument(s) d) Instrument(s) loop drawing (derived from Intools which shall contain termination details from Field through JB's to Rack Room) e) C&E sheet (For logic checks) f) IO Point Database (To refer : Ranges, Alarm Points, Controller action etc) g) Calibration sheet of Instruments in

loop. h) Observation sheet (To note down any observations during loop check/logic check activity for necessary corrective action). 4. Prerequisites like HVAC, Utilities shall be ensured 5. Loop check shall be carried with Handheld communicator / Calibrators or from IAMS system (For both FF & HART devices). 6. The checks shall be witnessed & loop folder documents shall be signed by DCS contractor, EPC contractor, PMC & Client.

The preparation of above said document is time consuming but these will ease the loop / logic checks as all data's will be available in a single folder.

This is the procedure we are following in our Greenfield Petrochemical Project.

Instrument Calibration, Loop Testing and System Start Up

Instrument Calibration is a necessary and important part of any instrument system.  The accuracy of the information produced by any instrument is dependent on it.  

Instrument Sciences and Technologies Inc.  recognizes the importance of calibration and has tailored the company policies and procedures to ensure you receive the highest level of quality and accuracy your process requires.  After all, your end-product quality and customers count on it.

We have a full, experienced staff of highly qualified Instrument Technicians ready to serve you. All technicians performing calibrations and loop check are EPRI level II and/or ISA level III qualified.  

We own over 400 individual pieces of NIST (National Institute of Standards and Technology) traceable calibration and test equipment.  This inventory is meticulously logged, tracked, and evaluated per our Quality Manual's documented procedures.  All equipment is either annually or semi-annually recalibrated and certified by an independent testing laboratory to NIST standards. Any instrument calibrated with this equipment is NIST traceable.

Some of our calibration services include:

Custom tailored customer/site specific recurring calibration program.  Inventory is taken of your instruments to determine the condition and frequency of calibration required.  A Technician arrives at your site when required to perform these calibrations, leaving you with a Calibration Certificate and up to date Calibration sticker affixed to the instrument.  If the instrument needs repair, replacement, or relocation, this service can be performed during this process.

Project specific calibration.  We are an unlimited resource of Certified Instrument Technicians for your project.  Our technicians are experienced in all the industries we serve, whether it is a Class 100 clean room, the top of a smokestack, or a confined space.

Field and Bench Calibrations.  One way to save time and cost during construction of your project is to have your instruments calibrated prior to installation.  We call this "Bench Calibration". Our calibration facility is set up on site and staffed with technicians.  We take care and custody of your instruments.  We then calibrate, certify and document every instrument.  Generally, calibration can be done quicker prior to it's installation.  Instruments pre-installed will be field calibrated.

In-house calibrations.  Send us your instrument.  We will calibrate it, certify it, and return it to you with your new calibration certificate and sticker.

Calibration for Validation. Experienced and professional Start-Up and Turnaround teams.

Instrument Loop Testing. Writing of Standard Operating Procedures for Calibration.

 

 

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Question

WHAT IS LOOP CHECKING ?

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Answer

# 1

Dear Instrumentation Friends,

The Loop checking is defined as pre-Commissioning activitywhich is initiated after installation of instruments at xlocation to y location

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instruments or systems.

Loop checking is basically done to ensure the instrumentsinstalled at x and y location has continuity signal witheach other potential's.

If we want to loop check the continuity from instrument tojunction box this is acheieved by laying a cable betweeninstrument and jounction box.

Normally after installation and cable laying duringconstruction activity is to be ensured that instrument andcable and junction termianls and cable which is layedunderground or above ground & is not damaged to confirm thisdamage it is mandatory to carry out loop checking betweeninstruments-junction box- Dcs that is from field to controlroom.

Simple Process:- is short the two cores of cable at one endand check with digital multimeter at other end if thecircuit resistance is ok then the same cores have the contunity which means that the cable cores are'nt damaged.

above procedure also helps to identify the particular cablecores for specific system founction

Above process is called as Cold Loop Checking loop checkingwithout any external sorce simulation.hencecalled as coldloop check. 

Is This Answer Correct ?   

46 Yes 4 No

 

Answer

# 2

Usually used term in Distributed Control System design-after the logic for the process has been programmed into the DCS software,the controller cabinet alongwith the IO modules is interfaced to the server on which the logic resides.The IOs are assigned as required and circuit continuity check is carried out-LOOP CHECKING..Outputs are forced to some value(universal) or forced high(binary) and the signal level is checked at the output Terminal block of the IO module.Similarly for Input checks, Voltage/Current is fed via a calibrator at the Input Terminal Block (1 by 1) and signal is detected via the monitoring mode on the DCS software..This is to ensure circuit continuity and scaling(signal limits)-it requires

nachiket dani

time and usually done as pre-FAT or FAT procedure. 

Is This Answer Correct ?   

33 Yes 8 No

 

Answer

# 3

Loop check activity is checking entire loop functionality, from field to DCS or Esd or plc or any logical system. It is necesary to check not only continuity of signal, but also range of calibration, alarms, set points and any signal included in the loop folder. For DCS will be tested with hart comunicator or temperature generator, 4-20mA, depends of witch instrument is involved. For Esd (emergency shut down system) loop check will be done with proper instrumentation tools to produce the specific presure or requaired level... For valves you must check all signals as open, close, hi and low limit switch, reset buttons, hand switches , feedback must be check and a lot of other things must be checked .. Loops are direct, revers, split range .. it is not easy and it is not only the continuity check to do. 

Is This Answer Correct ?   

20 Yes 2 No

scheau vlad

 

Answer

# 4

Loop CheckDefinition:Loop Check: An operational check of the field, controller and HMI elements of a control loop. A Loop Check is intended to ensure the integrity of the following.• The field sensing device is properly installed in accordance with engineering specifications.• The field sensing device is calibrated in accordance with engineering specifications.• The field sensing device is properly connected to it’s communication path to the Distributive Control System Controller. (e.g. Current Loop, Multiple device Bus Communication Protocol, etc.)• The field sensing device develops and transmits a proper analogous signal in response to a variable impressed upon it or a simulation command issued to it.• The corresponding logic in the DCS Controller is ranged accordingly for the field sensing device analog and engineering units.• The HMI of the DCS Controller accurately displays the engineering unit response to the signal of the field 

bill munz

sensing device.• Alarm points are properly entered into the logic of the DCS Controller and the HMI displays and logs these appropriately as they are reached.• Where control functionality is required, that the signal from the field sensing device is received by the control algorithm and generates the appropriate corrective output signal.• If present, the field control device, (e.g. Control Valve, Variable Speed Control etc.), is properly installed in accordance with engineering specifications.• The field control device is calibrated in accordance with engineering specifications.• The field sensing device is properly connected to it’s communication path to the Distributive Control System Controller. (e.g. Current Loop, Multiple device Bus Communication Protocol, etc.• The Field control device responds appropriately to the corrective signal received from the DCS Controller and that this action is appropriate to the desire process variable. • Where specified, the response action of the valve is correctly transmitted to the

DCS Controller and displayed on the HMI.• SUMMARY The Loop Check is intended to locate and identify deficiencies in the Field/Controller/HMI interface. This includes, but is not limited to, wiring and cabling issues, engineering issues and mechanical installation issues. It is not the focus of the Loop Check to correct any deficiencies found. Full information concerning the deficiency is captured and passed on to the appropriate parties for correction. Minor corrections can be accepted, but this should be limited in scope. 

Procedure:• A list of Loops is collected and identified by Tag Number. • Loops are grouped by Location, Availability, System, Equipment or other criteria. (Note: Locational Grouping of Loops results in the most efficient execution of Loop Check. The field team can be routed in a logical geographical progression of one device to another adjacent device without time loss for accessing different floors, buildings, plant sections etc.

Loop availability can prevent this. If at all possible, Loop availability should be planned to accommodate Locational Grouping)• Each loop is assigned a separate unique folder. o Each Loop Folder is populated with either a comprehensive Loop Sheet, and/or individual elements, consisting of the following Field Device Tag Number Field Device Parameters• Calibrated Zero Process Value and corresponding Analog (common 4 ma)• Calibrated Full Process Value and corresponding Analog (common 20ma)• Action Field Device Accessory List (e.g. Transmitter 3 Valve manifold, Valve Pneumatic Latch etc.) Field Device Physical Location Field Device instructions as appropriate Field Device Wiring connection data. (Terminals, polarity) Wiring Routing information (e.g. Junction Boxes, Terminals etc) DCS I/O Marshalling Information, (Cabinet,Terminals, Polarity)

 DCS I/O Card or Module information. DCS Parameters• Ranges • Alarm points DCS HMI Graphics assignments• From the Pending Loops file, the Console Engineer and the Field Technician draw the Loop Folders to be checked in that time period.• The Console Engineer and the Field Technician review the contents of each Loop Folder in the group to be checked, comparing parameters for parity and completeness of data.• A sequence of Check is agreed to.• The Console Engineer prepares his record keeping tool, tracker, for the loops to be checked in the agreed upon sequence.• The Field Technician evaluates the test equipment to be used, collects same and proceeds to the first device to be checked. • The Field Technician communicates to the Console Engineer the Tag of the device he is at• The Console Engineer calls up the appropriate I/O channel• The Console Engineer calls up the appropriate HMI graphic or graphics

• Transmitterso The Field Technician reviews the installation and process connections to ensure they are in accordance with the specification details and good installation practice. o Either by impressed signal, (“Pump Up”) or Communicator command, the Field Technician drives the transmitter output signal through it’s range. Slowing at Alarm Points so the Console Engineer can confirm alarm action. (NOTE: Common is a 0% 25% 50% 75% 100% Check. This was originally necessary to confirm the linearity of earlier Pneumatic and ElectroMechanical devices, it no longer is as critical and becomes a matter of agreed upon preference.)o Any wiring and/or piping disturbed to accomplish signal impression is restored. o The Field Technician confirms the process connection line up is as desired. (e.g. For a Differential Flow Transmitter to be placed in service after check out, the three valve manifold would have the balance closed and the process ports open)• Control Loopso While the transmitter signal impression is 

occurring, the Console Engineer will call up the Control Algorithm faceplate and by placing the control mode to Auto, determine that the output action is appropriate. • Control Valveso The Field Technician reviews the installation to ensure it is in accordance with the specification details and good installation practice.o If pneumatic, the Field Technician opens the air source checking for proper pressure adjustment and air quality. o If electric, the Field Technician energizes the proper breaker.o The Console Engineer adjusts the output signal to the valve while the Field Technician observes the action of the valve.o Jointly, the Field Technician and the Console Engineer determine if the resultant action is appropriate for the control signal sent and the previously determined action of the control algorithm.o Where present, the Console Engineer observes any feedback from the valve to be in agreement with the reported position of the valve action by the Field Technician.o Any accessories to the valve

are checked for proper action.• Switcheso The Field Technician reviews the installation to ensure it is in accordance with the specification details and good installation practice.o Either by Signal Impression, manual toggling, or conductor manipulation, the Field Technician causes a change in state of the field device signal.o The Console Engineer observes the indication of the signal to be in agreement with the physical state as impressed on the device by the Field Technician.

• The Console Engineer records the results of the results of the signal impression, alarm points, ranges, valve actions, etc. • If no deficiencies were noted during the Loop Check, the Loop Folder is placed in the Completed Loops File. At this point, the client signs for the Loop as being complete. • The Console Engineer records and captures any and all deficiencies noted by either the Field Technician or the Console Engineer on a sequential uniquely numbered

form for each deficiency noted. o This deficiency form, or “Kick Back” is logged by the sequential number assigned to it in a Master Kick Back Log maintained by the Console Engineero The Kick Back form shall include  Tag number of the deficit device.  Date Reporting Party Thorough description of the symptoms noted and any and all actions taken by the reporting partyo Kick Back form is entered into the Active Kick Back file. o The Log Number of the Kick Back is noted in the Loop Folder and the Loop Folder is moved to the Detained Loops File.o The resolution team draws Kick Back forms from the Active Kick Back file. o Each time the deficiency is addressed, the Kick Back form is submitted to the Console Engineer. The Kick Back shall include • Date• Resolving Party• Thorough description of the corrective actions 

taken• Recommendations for further actions• Responsible party assigned to further actionso When the deficiency is corrected, the Kick Back form is submitted to the Console Engineer. The Completed Kick Back shall include • Date• Resolving Party• Thorough description of the corrective actions taken 

Is This Answer Correct ?   

14 Yes 1 No

 

Answer

# 5

check the continuty,signal and power (depandeng on instrument) frome fild instrumnet to the control room. 

Is This Answer Correct ?   

16 Yes 4 No

sangam surendra

 

Answer

# 6

checking out whether the reading is coming to the connected txt.

intially d.c.s and field instrument are connected 

Girish_b_k

simulator is used to give mA to txt. and correspondingreadin g is checked in d.c.s whether the o/p is comparedwith mA 

0- 100 kg 4mA for 0kg and 20mA for 100kg 

Is This Answer Correct ?   

15 Yes 4 No

 

Answer

# 7

In simple terms it is a test starting at the process variable through the controller and back to the control device to see if everything is working properly. 

As as example: You have a tank with a water level controlled by an inlet valve that opens or closes as needed to maintain the level. 

The signal from a level device (let's say a level transmitter) goes to a controller. A signal then goes from the controller to the level control valve opening or closing it. That is the control loop. 

The loop test determines if the proper signal is going from the level transmitter to the controller and then is the correct signal going from the controller to the control valve and is it opening or

dnz_72

closing as it should. 

Is This Answer Correct ?   

5 Yes 1 No

 

Answer

# 8

simply loop checking is check of continuty in all wire from location to location. 

Is This Answer Correct ?   

15 Yes 19 No

What is cold loop checking and hot loop checking for DCS & what is the procedure to do this???

SANTHIRAJ SATHANNALoop checks are conducted for Inputs and Outputs as pre commissioning activities

* Loop Check

This is an electrical continuity check to confirm wiring integrity from control panel's terminal block to the field instrument. Please note that field cabling starts from field instrument and goes through Junction boxes and marshaling cubicle to reach termianal blocks of the control panel

* loop check

After successful cold loop check, each I/O is subjected to hot loop check. In this testing entire loop functionality is checked by simulation of the signal with power up from DCS or PLC * range

* of inputs / outputs / Field switches / Solenoids

* register updates

4.SCADA updates

October 26, 2013

Radomir PistekCold loop check: Equipment: Multimeter and similar equipment Goal: continuity test - to check/verify/confirm the wiring continuity between the device/sensor and control system terminal board (include all wiring way - i.e. via junction boxes). There is system power off (control system down) and generally you will measure resistance.

Hot Loop Check: Equipment: any type of signal simulator/generator, calibrators and so on. Goal: After verifying cold loop check to be sure no ground/discontinuity faults is control system powered up and all loops are Hot (Powered). Confirmation/verification that loops correspond to designed / wired types in DCS and comparing generated values with values indicated in control system)for all types of loops (digital input, digital ouput, flow,RTDs,Transmitters 4/20 mA or 0/10 V and so on). There is also checked configuration integrity (not only signal itself) - for example, in pressure transmitter loop, there is simulated a pressure input to the transmitter and evaluated the feedback on controller side. This is done via pressure calibrator or manual pump with a gauage (comparing supplying pressure into the transmitter and compare the supplied pressure with the value on in teh control system).

October 27, 2013

Alejandro Varga MederMr. Sathanna summarized it very well.

October 28, 2013

Louis ReevesCold Loop check is used to also verify that field instruments are connected to the right DCS/PLC/SCADA terminal inputs as well as wiring continuity This is

accomplished using multi-meter resistance readings or using 4-20 mA calibrator to test the wiring. I prefer the 4-20 mA calibrator as you can change the 4-20 mA to verify that you have the wires. This Should be done WITHOUT the instruments and the terminal inputs to the DCS/PLC/SCADA connected. One should also check at this time, that there are no residual extraneous induced voltage on the signal wires. Using a volt meter in the low voltage AC mode will detect this and help find any sources or RFI and EFI that may be present.

After that, Hot loop checks are done as previously discussed by Mr. Pistek.

March 2, 2014

amine kaddourDear rajit

The Cold loop check is a continuity check of the loop, you have to shunt the two wires of the loop in the marshalling or the transmitter side and put the multimeter in OHM or diode mode, and check for low resistance. The hot loop check, you connect to your PLC or from DCS, you put the output or input in manual mode and you force the output to(0-1) or (4-20ma) and check in the field the right value. * the input you put a shunt or generate a 4-20ma signal and check the value in PLC or DCS.

Another remark: this hot loop methode is not applicable to fieldbus and hart loops. with universal I/O from Emerson or Honeywell, the loop check will be easy, because we will not care about signal type in marshalling, we have to plug the transmitter and configure its input(AI,AO or DI DO) with software.

5 months ago

PRATAP NAIRDear Rajit, very detailed explanation is been shared by experts of this field.In nushell Cold stands itslef is clear system wiring checking for its contiunity and Hot stands, actual signal generated is been transmitted properly or not to check the entire loop system.

pre loop and loop checkinghow to simulate or test ins preloop and loop checking

By aalbin on 23 November, 2012 - 10:05 am

hi

i'm asking how to simulate for preloop from the field to Process Interface Bldg. (PIB) or DCS this instrument: the tools we been use was Hart Communicator 375, LC 100 Martel, Druck 300 DPI603, Ametek 7975 Hand pump, megger, TK3 and can you give a drawing the typical setup of each instrument to calibrator to simulate the preloop? i'm appreciate those who will help me. and how to use the calibrator to simulate the instrument?

H2s gas detector combustible Gas DetectorCorrosion XMTR and Access Fitting CM, BEACONS, HORN

TRANSMITTER HART / ANALOG - Corrosion TransmitterDP Flow Transmitter w/ ventury, Rotameter Transmitter, Analyzer Indicator Transmitter, Agar Level Transmitter, Vibration Transmitter, Intensity Current Transmitter, Magnetic Flow Meter, Remote Level Indicator, Remote Temperature Indicator, Temperature Indicator Transmitter, Analyzer Indicator Transmitter, Agar Level Transmitter, DP Level Indicator Transmitter, Vibration Transmitter, DP Level Indicator Transmitter, Temperature Indicator Transmitter

TRANSMITTER FIELDBUSCorrission Transmitter FieldbusDP Flow Transmitter w/ ventury FieldbusRotameter Transmitter FieldbusDP Level Indicator Transmitter FieldbusGuide Wave Radar Level Transmitter FieldbusAnalyzer Indicator Transmitter FieldbusAgar Level Transmitter FieldbusVibration Transmitter Fieldbus - FFVMS Trend master 2000/ Velocity Seismo ProbeIntensity Current TransmitterMagnetic Flow Meter FieldbusRemote Level Indicator FieldbusRemote Temperature Indicator FieldbusTemperature Indicator Transmitter FieldbusAnalyzer Indicator Transmitter FieldbusAgar Level Transmitter FieldbusDP Level Indicator Transmitter FieldbusVibration Transmitter FieldbusTemperature Indicator Transmitter FieldbusThermocouple Temperature TransmitterRTD Temperature Transmitter

CONTROL VALVEON OFF Deluge ValveLevel control valve FieldbusHand Control Valve FieldbusTemperature Control valve FieldbusPressure Control Valve FieldbusLevel Control Valve FieldbusMOV FFAOV FF

SWITCHPressure SwitchLevel SwitchTemperature switchFlow SwitchPig tail

By aan aan on 23 November, 2012 - 11:59 pmDear aalbin,

I hope that following link will help and assist you to learn mentioned test instrument:

1. Hart Communicator 375

http://www2.emersonprocess.com/siteadmincenter/PM%20Asset%20Optimization%20Documents/ProductReferenceAndGuides/375_ru_usermanual.pdf

2. LC 100 Martel

http://www.martelcalibrators.com/LC-110&110H_DataSheet_HR.pdf

3. Druck 300 DPI603

http://www.catrents.ca/Products/Equipment/Rental_Equipment/Instrumentation/Pressure_Tests_and_Measurements/downloads/Druck_DPI603_Pressure_Calibrator.pdf

4. Ametek 7975

http://www.instrumart.com/assets/Ametek-MGC_manual.pdf

5. Megger

http://www.ge-mcs.com/download/sensors-and-transducers/141580.pdf

6. T3K

http://www.ge-mcs.com/download/sensors-and-transducers/141580.pdf

Please learn those documents first, try at field and if you still have anything to discuss please post here, experts here will glad to explain more deeply.

Hope this help

RegardsAan

By aalbin on 24 November, 2012 - 9:10 pmhi

we are now loop testing a vibration what is the procedure for using tk3 bentley nevada? what is the setup?

thank you

By Jonas Berge on 22 July, 2013 - 1:37 pmDuring loop check you check the integrity of the 4-20 mA loop and the indication in the DCS

The reason for the loop check of each signal associated with each device is to ensure that:- Validate that each signal of the device is really connected to the correct terminals and that each and every signal associated with the device is wired correctly through the terminals in the field junction box, to the field termination assembly in the marshalling cabinet, to the I/O card and to the correct tag in the DCS database

- Validate that each signal of the device is not limited in the high end for example due to high resistance caused by poor connection or corrosion on terminal at the device or field junction box

- Validate that each signal of the device is not biased due to a ground loop current caused by water or moisture in the device housing

- Validate that there are no non-linear elements in the current loops for each signal of the device such as signal conditioner or safety barrier with problem

- Validate that the ranging in the DCS for each signal is correct so that the correct engineering unit value is displayed

Loop check for each signal of a transmitter is done by simulating 4/8/12/16/20 mA corresponding 0/25/50/75/100% reading. For instance, if the range is 0-800 kPa, simulating 4/8/12/16/20 mA should result in a display of 0/200/400/600/800 kPa in the DCS.

For FOUNDATION fieldbus- You will know that the device is connected to the correct terminals because the device automatically appears in the system "live list" displayed with device tag, manufacturer, model number, unique identifier and version etc. This is true also for discrete devices like intelligent two-wire on/off valves and electric actuators / motor operated valves (MOV). All the signals associated with that device automatically become correct so you only check the devices is there, you don't have to check signal by signal.

- A digital signal value cannot be limited, biased, non-linear or otherwise distorted without being detected. Therefore a 5-point loop check of each signal is not required. Instead use a portable fieldbus tester like Relcom FBT-6 to verify device supply voltage, signal level, and noise level are within limits thus detecting any wiring issues or water ingress etc.

Cheers,Jonas

Pressure Calibrator and mA Calibration

CALOG-Pressure II is a handheld calibrator with plug-on pressure sensors for any range up

to 1000 bar. This instrument also has the functions to install and maintain all powered and

non-powered milliamp loops. It is supplied with 1 plug-on pressure sensor with optional

additional sensors available for the other pressure ranges specified below.

As a small, rugged unit with rubber protective boot, high precision and Li-ion long-lasting

rechargeable battery pack, CALOG-Pressure II is ideal for industrial field calibration. Data

may be logged to the removable SD card in CSV format, with user-selectable data fields and

timebase. Logged data may also be retrieved via the USB port. CALOG calibrators are made

by Instrotech and comply with CE and C-Tick EMC and EMI and Low Voltage directives. Features Specifications Data sheet

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Small, rugged, handheld with a protective rubber cover Graphic display of measured value, percent and battery status Measure, source and simulate 0-24 mA with 0.01% accuracy and 1

microamp resolution Measure 32V with 0.005% accuracy and 1mV resolution Continuity test function Trend logging with programmable timebase Displays values in mA and % or % and mA Measure complete vacuum to 1000 bar pressure Measures in bar, mbar, kPa, MPa, psi, m of H²O, in of H²O, ft of H²O, mm of

Hg (torr), cm of Hg, in of Hg, kg per cm² and atmospheres Contains a handy pressure conversion calculator Programmable auto-off, restart at last setting and selectable display

resolution Data logging to removable SD card with time and date USB port for access to logged data Lithium-ion rechargeable battery pack with 'fuel gauge' chip One pressure sensor included, more are optional Carry case, battery charger, SD card, test leads and factory calibration

certificate 2 year guarantee, excluding batteries

Calog Pressure Calibrator Kit

Pressure Calibrator display

Calog Pressure Calibrator Trend Graph

Calog pressure calibrator functions

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Pricing and Availability may be subject to change without notice.