Multifunction calibration using the 7526A Precision
Contents
1. Multifunction calibration using the 7526A Precision Process Calibrator The flexibility and precision measurement capabilities of the 7526A Precision Process Cali brator make it the ideal tool to handle multifunction calibration voltage current thermocouple RTD and pressure This applica tion note provides examples of how to calibrate a Rosemount 3144 Temperature Transmitter and Rosemount 3051 Pressure Transmitter These two trans mitters are widely used in the process control industry and provide an excellent starting point to become familiar with the 7526A features and interface Figure 1 Please take time to review the 7526A user s manual and device specifications before beginning Calibrating a Rosemount 3144 Temperature Transmitter The transmitters covered in this application note are HART smart two wire devices that require loop power The 7526A features a fully isolated mea surement channel which can be used to power the 24 V dc loop monitor current and provide the 250 HART resistor enabling direct connection to a HART communicator This example calibrates a Rosemount 3144 Temperature Transmitter that is set up to measure a single Type J ther mocouple To calibrate the Rosemount 3144 an A D trim or two point sensor trim is per formed A sensor trim allows for alteration of the transmitter s input to a known NIST traceable source In this case the tem perature is simulated from the F2. 355 3225 or Fax 425 446 5116 In Europe M East Africa 31 0 40 2675 200 or Fax 31 0 40 2675 222 In Canada 800 36 FLUKE or Fax 905 890 6866 From other countries 1 425 446 5500 or Fax 1 425 446 5116 Web access http www flukecal com 2006 2012 Fluke Calibration Specifications subject to change without notice Printed in U S A 11 2012 4264601A_EN Pub ID 12003 eng Modification of this document is not permitted without written permission from Fluke Calibration 3 Fluke Calibration Multifunction calibration using the 7526A Precision Process Calibrator
3. connected properly as illustrated 3 Select loop power and the HART option on the isolated side The mA reading will be displayed if all connections are made correctly 4 Vent the pressure source to atmosphere and press the Shift key and Zero 9 key to establish a good zero Close the valve on the pressure source to begin calibration The 7526A should be reading close to 4 0000 mA 5 Connect the HART commu nicator or equivalent across the 24 V dc power connec tions Power on the device and verify communication Thermocouple transmitter calibration Ke Save the transmitter con figuration and perform an As Found measurement before making any changes to the transmitter This docu ments the current state of the transmitter Navigate to the Rosemount sensor calibration lower and upper trim methods A complete menu tree for the Rosemount 3051 can be found in the product refer ence manual Verify that the pressure units of measure on the 7526A match those of the HART communicator Apply the Lower Trim point requested by the HART com municator by adjusting the pressure source This is typi cally zero for pressure Follow screen prompts and proceed to the Upper Trim point Apply the Upper Trim point and follow screen points to complete the A D calibration 10 Verify the 4 20 mA output meets published transmitter specifications by performing a D A trim Since the con nect
4. ions are already made simply follow prompts from the communicator and verify the analog output on the 75264A m Calibration e a e 2 0 Aw b Pressure Module Documenting Process Calibrator Hand Pump Vent to Precision Regulated Atmosphere Supply Pressure Figure 4 Pressure module source and transmitter connection Summary The 7526A Precision Process Calibrator is a versatile benchtop instrument for multifunc tion calibration This application note has illustrated how the 7526A is used to cali brate two transmitters that are popular in the process control industry the Rosemount 3144 Temperature Transmitter and Rosemount 3051 Pressure Transmitter Since the 7526A can simultaneously source and measure voltage current or resistance it can calibrate a range of other process tools beyond temperature and pressure transmitters These tools include RTD and thermocouple readouts pressure gauges digital process simulators data loggers multi meters and more Fluke Calibration Precision performance confidence T T T v T T v T T T T Electrical RF Temperature Pressure Flow Software Fluke Calibration Fluke Europe B V PO Box 9090 PO Box 1186 5602 BD Everett WA 98206 U S A Eindhoven The Netherlands For more information call In the U S A 877
5. pheric pressure HART communicator key The 7526A will sense 12 Apply the Lower Trim point the pressure module or Offset by entering the automatically value requested by the HART communicator This is typically a negative value Follow screen prompts and Pressure proceed to the Upper Trim Module point or Slope 13 Apply the Upper Trim point and follow screen prompts to complete the A D calibration 14 Verify the 4 20 mA output meets published transmitter specifications by performing a D A trim Since the con nections are already made simply follow the prompts from the communicator and verify the analog output on Figure 3 Pressure module connection the 7526A 7526A PRECISION PROCESS CALIBRATOR TC INPUT OUTPUT AW RTD N INPUT HI SENSE Q L 2 Fluke Calibration Multifunction calibration using the 7526A Precision Process Calibrator Calibrating a Rosemount 3051 Pressure Transmitter Follow these steps to cali brate the Rosemount pressure transmitter 1 Make the necessary connec tions to the pressure module pressure source and pres sure transmitter as shown in Figure 4 Connections must be leak free for proper calibration Connect to the High Side H and make sure the Low Side L is vented to atmosphere 2 Connect the test leads from the transmitter to the HI and LO terminals ensur ing that the polarity of the circuit is
6. rom the Fluke Calibration Digital Library www flukecal com library Application Note Calibration woma MAX Te INpuT OUTPUT AW RTD 0 INPUT Ea c HI T zov PK MAX Figure 1 Fluke Calibration 75264 interface 75264A to the transmitter This process adjusts both the slope and offset of the original factory curve fit To perform the sensor trim an external HART com municator is needed to execute the digital commands In addi tion the 4 20 mA output on the isolated measurement channel is monitored and used to deter mine if a D A trim is required Follow these steps 1 Power on the 7526A and allow it to warm up 2 Disconnect any test leads on the device under test z E a a o DRS a A Tai l LOOP PWR An vek AX 3 Connect a Type J mini con nector into the TC input output jack as shown in Figure 2 Make sure to use a Type J thermocouple typi cally black 4 Connect the bare ends of the thermocouple wire to ter minals 2 and 3 of the transmitter and run power as shown in Figure 2 ensuring that the polarity of the circuit is connected correctly 5 Select the TC RTD button and toggle to TC Figure 2 Thermocouple and temperature transmitter connection 0 b i Cae ee or E Documenting Process Calibrator m Calibration 6 Once in TC mode cycle though the
7. thermocouple types to Type J by using the Type Units key 7 Select Shift and Output 7 to source temperature Key in 0 0 C and press Enter 8 Select the mA loop power and the HART option on the isolated side The mA reading will be displayed if all selections are made correctly 9 Connect a HART communi cator or equivalent across the 24 V dc power connec tions Power on the device and verify communication Save the transmitter config uration and perform an As Found measurement before making any changes to the transmitter This documents the current state of the Adding a Fluke 700 3 Press the Type Units key to transmitter select desired units 10 Navigate to the Rosemount Series Pressure Module It is important to review the Sensor calibration lower To calibrate a pressure transmit i and upper trim methods ter the pressure measurement Tecommended calibration pro A complete Menu Tree for capability needs to first be cedure and tolerances required the Rosemount 3144 can be configured for the 7526A Follow PY the manufacturer to ensure found in the product refer these steps the proper pressure module is ence manual 1 Connect the Fluke 700 Series Selected The pressure transmit 11 Verify that the tempera Pressure Module as shown in ter used in this application note ture unit of measure on the Figure 3 is a simple gage unit that is ref 7526A matches that of the 2 Press the Q pressure erenced to atmos
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