® 744 Documenting Process Calibrator HART Mode Users Guide PN 691292 December 1998 © 1998 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.
Table of Contents Title Introduction ..................................................................................................................... How to Contact Fluke ..................................................................................................... Connecting to a HART Transmitter ................................................................................ Supported vs. Generic Transmitters ...............................................................................
744 HART Mode Users Guide Calibrating a Supported HART Transmitter .................................................................... Loop Test.................................................................................................................... Output Trim................................................................................................................. Sensor Trim ................................................................................................................
List of Tables Table 1. Title Page Supported vs. Non-Supported Instruments............................................................................
744 HART Mode Users Guide iv
List of Figures Figure 1. 2. 3. Title Page Connecting to a HART Transmitter........................................................................................ 5 744 HART Mode Menu Tree.................................................................................................. 9 Block Diagram of a HART Transmitter ..................................................................................
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Documenting Process Calibrator HART Mode Introduction w Warning To avoid electric shock, read the Safety Information in the 744 Users Manual before you use the Fluke 744 Documenting Process Calibrator. With analog transmitters, you must make a hardware adjustment during calibration. With HART (HighwayAddressable Remote Transducer) transmitters, adjustments are by remote command. These adjustments require the use of a communication tool as well as a calibrator.
744 HART Mode Users Guide How to Contact Fluke To contact Fluke, call: USA and Canada: 1-888-99-FLUKE (1-888-993-5853) Europe: +31 402-678-200 Japan: +81-3-3434-0181 Singapore: +65-*-276-6196 Anywhere in the world: +1-425-356-5500 Or visit us on the World Wide Web: www.fluke.
Documenting Process Calibrator HART Mode Connecting to a HART Transmitter Connecting to a HART Transmitter 4. To connect to and begin to communicate with a HART transmitter, refer to Figure 1 and proceed as follows: The calibrator provides loop power through an internal series resistance of 250 Ω. Note If you only want a communication connection to a transmitter that is powered in a loop, simply clip the HART alligator clips to the loop power terminals on the transmitter, press r, and you are done. 1.
744 HART Mode Users Guide The Active Device screen provides the following information for all transmitters, supported or generic: pe06s.
Documenting Process Calibrator HART Mode Connecting to a HART Transmitter 744 MEAS SOURCE 7 4 9 5 -PS +PS M -IN +IN SETUP CLEAR S Z ( ZERO) 6 2 3 ENTER . 0 mA RTD Transmitter TC RTD 8 1 V RTD mA V Hz V DOCUMENTING PROCESS CALIBRATOR mA V RTD CAT 30V MAX SOURCE 30V MAX MEAS 30V MAX 300V MAX TC pe01c.eps Figure 1.
744 HART Mode Users Guide Supported vs. Generic Transmitters The calibrator communicates with virtually all HART transmitters. In addition, the calibrator is programmed to use device-dependent commands for a selection of HART transmitters and their software versions. These are “supported transmitters.” All other transmitters are “generic.” 2. If the calibrator is not connected to a HART transmitter, press the r key followed by More Choices. 3. Press the Device Revs softkey. The Browser screen appears.
Documenting Process Calibrator HART Mode Supported vs. Generic Transmitters Table 1. Supported vs.
744 HART Mode Users Guide Communication Operations Setup Operations Figure 2 shows the HART Mode menu tree. Availability of some elements in the menus depends on which transmitter you are using, and whether the transmitter is configured by itself on a current loop or in a multidrop connection.
Documenting Process Calibrator HART Mode Communication Operations PROCESS (Example) PV % Range AO SV, TV, QV Basic • • • • • Tag PV units LRV, URV Damping Transfer function • • • • • • Software version Final assembly number Tag Message Date Description Sensor Device Identification SETUP Loop test SERVICE HART Output Pressure zero trim Output trim Sensor trim HART Information • • • • • • Manufacturer Model Device HART ID Software revision Hardware revision Number of preambles • • Sensor se
744 HART Mode Users Guide Sensor Device Identification From the Active Device screen press the Setup and Sensor softkeys to access the read-only Sensor Setup screen. This is where you can view information about the sensor in the transmitter, including serial number, limits, and span. The limits shown are the absolute limits for the sensor. (The Upper Range Value (URV) and Lower Range Value (LRV) are different, and are viewable and programmable through the Basic Setup screen.
Documenting Process Calibrator HART Mode Communication Operations HART Output HART Information From the Active Device screen press the Setup and HART Output softkeys to access the read/write HART Output From the Active Device screen press the Setup and HART Information softkeys to access the read-only HART screen. Here you can change the Poll Address (0 = single transmitter, any other address = multidrop), and control burst mode. Information screen.
744 HART Mode Users Guide Service Operations The Service softkey provides access to Loop Test, Pressure Zero Trim (where applicable), Output Trim, and Sensor Trim operations. For generic transmitters, only Loop Test, Output Trim, and Pressure Zero Trim are available. (See Table 1.) The trim (adjustment) operations are described later in this manual. Note Loop Test and Output Trim are not available if the transmitter is in multidrop mode.
Documenting Process Calibrator HART Mode Understanding HART Calibration Understanding HART Calibration 744 HART Mode Menus for Adjustment An analog transmitter has one stage of electrical conversion from a measured physical parameter to a 4-20 mA current loop output. A HART transmitter has the three stages shown in Figure 3. In 744 HART mode, adjusting the Input stage is called Sensor Trim. Adjusting the Output stage is called Output Trim. Both adjustments are made from the Service menu.
744 HART Mode Users Guide 744 Calibrator Sensor trim Pressure zero trim Physical variable Input PV PVAO Computation Loop test Output trim Output 4-20mA loop HART transmitter pe02f.eps Figure 3.
Documenting Process Calibrator HART Mode Calibrating a Supported HART Transmitter Calibrating a Supported HART Transmitter An “as found” and “as left” transmitter calibration has an easier, more automated process for HART transmitters than for analog transmitters. The calibration procedure is the same as described in the 744 Users Manual, except for how you set up the calibration template, and how you adjust the transmitter.
744 HART Mode Users Guide 7. Proceed with calibration as usual (described in the 744 Users Manual). 8. Press the Adjust softkey. This returns you to HART mode, and presents you with the Service menu for the transmitter. 9. Do an Output Trim, a Sensor Trim, or both. These are Service Operations, and are described later in this manual. When you have finished with the trim procedures, press the Done softkey. 10.
Documenting Process Calibrator HART Mode Calibrating a Supported HART Transmitter Output Trim Sensor Trim An Output Trim adjusts the tranmitter’s Output stage. You can perform an Output Trim on both generic and supported transmitters. You can only perform a Sensor Trim on a supported transmitter. A Sensor Trim adjusts the Input stage of a HART transmitter. If your application does not use the Output stage of the transmitter, Sensor Trim is the only adjustment you need to make.
744 HART Mode Users Guide 2. Use the u and d keys to select the Sensor Trim operation, and press e. 3. 4. 5. Follow the instructions on the display. For pressure, there is a message to connect a pressure module to the calibrator, and another to press the c key to zero the pressure module.
Documenting Process Calibrator HART Mode Cloning a Transmitter Cloning a Transmitter 4. Press the Store Page softkey to load the settings into the calibrator’s memory (not the transmitter). Cloning copies the Basic Setup information from one transmitter to another. You can clone generic and supported transmitters. 5. Disconnect the calibrator from the transmitter and connect it to the transmitter you want to configure. Press the Abort softkey to establish communication. 6.
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Index —A— —D— —I— abort, 12 active device screen, 4 analog mode, 12 as found, 15 as left, 15 device identification, 10 input stage, 13 —E— external series resistor, 3 —B— —G— basic setup, 8 browser screen, 6 generic transmitters, 6 —C— calibrating a HART transmitter, 15 cloning, 19 communication test leads, 3 —L— loop power, 3 loop test, 16 LRV, 4 —M— —H— HART information, 11 HART mode, 12 HART output, 11 model numbers, 6 multidrop, 8, 13 21
744 HART Mode Users Guide —O— —R— output stage, 13 output stage, 16 output trim, 13, 17 recall page, 19 software versions, 6 store page, 19 supported transmitters, 6 —S— —T— sensor, 10 sensor trim, 13, 17 serial communication, 3 series resistor, 3 service operations, 12 setup basic, 8 device identification, 10 HART information, 11 HART output, 11 sensor, 10 task, 744, 15 telephone numbers for Fluke, 2 trim output, 13, 17 pressure zero, 13 sensor, 13, 17 —P— phone numbers for Fluke, 2 pressure modu
