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Fluke 744 manual

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Table of contents for the manual

  • Page 1

    ® 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 respec tive companies.[...]

  • Page 2

    [...]

  • Page 3

    i Table of Contents Title Page Introduction ................................................................................................................... .. 1 How to Contact Fluke ..................................................................................................... 2 Connecting to a HART Transmitter ...........................[...]

  • Page 4

    744 HART Mode Users Guide ii Calibrating a Supported HART Transmitter .................................................................... 15 Loop Test.................................................................................................................... 16 Output Trim....................................................................[...]

  • Page 5

    iii List of Tables Table Title Page 1. Supported vs. Non-Supported Instruments............................................................................ 7[...]

  • Page 6

    744 HART Mode Users Guide iv[...]

  • Page 7

    v List of Figures Figure Title Page 1. Connecting to a HART Transmitter ........................................................................................ 5 2. 744 HART Mode Menu Tree .................................................................................................. 9 3. Block Diagram of a HART Transmitter ....................[...]

  • Page 8

    744 HART Mode Users Guide vi[...]

  • Page 9

    1 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  (Highway- Addressable Remote Transducer) transmitt[...]

  • Page 10

    744 HART Mode Users Guide 2 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.com[...]

  • Page 11

    Documenting Process Calibrator HART Mode Connecting to a HART Transmitter 3 Connecting to a HART Transmitter To connect to and begin to communicate with a HART transmitter, refer to Figure 1 and proceed as follows: Note If you only want a communication connection to a transmitter that is powered in a loop, simply clip the HART alligator clips to th[...]

  • Page 12

    744 HART Mode Users Guide 4 pe06s.bmp The Active Device screen provides the following information for all transmitters, supported or generic: • Poll address (if not 0) • Model number and Tag ID • PV (Primary Variable) • PVAO (digital representation of the Analog Output) • PV LRV (PV Lower Range Value) • PV URV (PV Upper Range Value) •[...]

  • Page 13

    Documenting Process Calibrator HART Mode Connecting to a HART Transmitter 5 RTD Transmitter -PS +PS M -IN +IN S Z 7 89 456 123 0 . V MEAS SOURCE SETUP mA V Hz TC RTD CLEAR (ZERO) ENTER TC mA mA V V RTD RTD SOURCE 300V MAX 30V MAX 30V MAX 30V MAX MEAS CAT DOCUMENTING PROCESS CALIBRATOR 744 pe01c.eps Figure 1. Connecting to a HART Transmitter[...]

  • Page 14

    744 HART Mode Users Guide 6 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.?[...]

  • Page 15

    Documenting Process Calibrator HART Mode Supported vs. Generic Transmitters 7 Table 1. Supported vs. Generic Transmitters (Devices) Menu Operation Supported Transmitter Generic Transmitter Single Point Multidrop Single Point Multidrop Top Level Active Device screen •• • • Setup Basic (read/write, cloning capability) •• • • Sensor (r[...]

  • Page 16

    744 HART Mode Users Guide 8 Communication 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. Viewing Process Variables From the Active Device screen press the Proc[...]

  • Page 17

    Documenting Process Calibrator HART Mode Communication Operations 9 • Write protect • Alarm state • HART poll address • HART burst mode • HART burst command • Manufacturer • Model • Device HAR T ID • Software revision • Hardware revision • Number of preambles • Software version • Final assembly number •T a g • Message [...]

  • Page 18

    744 HART Mode Users Guide 10 Sensor 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[...]

  • Page 19

    Documenting Process Calibrator HART Mode Communication Operations 11 HART Output From the Active Device screen press the Setup and HART Output softkeys to access the read/write HART Output screen. Here you can change the Poll Address (0 = single transmitter, any other address = multidrop), and control burst mode. pe12s.bmp HART Information From the[...]

  • Page 20

    744 HART Mode Users Guide 12 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 man[...]

  • Page 21

    Documenting Process Calibrator HART Mode Understanding HART Calibration 13 Understanding HART Calibration 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. Depending on how the transmitter is used in your applic[...]

  • Page 22

    744 HART Mode Users Guide 14 HART transmitter Computation Input Physical variable 4-20mA loop Sensor trim Pressure zero trim Loop test Output trim Output PV PV AO 744 Calibrator pe02f.eps Figure 3. Block Diagram of a HART Transmitter[...]

  • Page 23

    Documenting Process Calibrator HART Mode Calibrating a Supported HART Transmitter 15 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[...]

  • Page 24

    744 HART Mode Users Guide 16 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 h[...]

  • Page 25

    Documenting Process Calibrator HART Mode Calibrating a Supported HART Transmitter 17 Output Trim An Output Trim adjusts the tranmitter’s Output stage. You can perform an Output Trim on both generic and supported transmitters. To perform an Output Trim: 1. From the Active Device screen Press the Service softkey, followed by Output Trim . pe16s.bmp[...]

  • Page 26

    744 HART Mode Users Guide 18 2. Use the u and d keys to select the Sensor Trim operation, and press e . 3. 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. 4. Press Continue . pe18s.bmp 5. Enter the trim value you want[...]

  • Page 27

    Documenting Process Calibrator HART Mode Cloning a Transmitter 19 Cloning a Transmitter Cloning copies the Basic Setup information from one transmitter to another. You can clone generic and supported transmitters. To use the calibrator to clone a transmitter: 1. Connect the calibrator to the transmitter you want to clone. You only need a communicat[...]

  • Page 28

    744 HART Mode Users Guide 20[...]

  • Page 29

    21 Index —A— abort, 12 active device screen, 4 analog mode, 12 as found, 15 as left, 15 —B— basic setup, 8 browser screen, 6 —C— calibrating a HART transmitter, 15 cloning, 19 communication test leads, 3 —D— device identification, 10 —E— external series resistor, 3 —G— generic transmitters, 6 —H— HART information, 11 HAR[...]

  • Page 30

    744 HART Mode Users Guide 22 —O— output stage, 13 output stage, 16 output trim, 13, 17 —P— phone numbers for Fluke, 2 pressure module, 18 pressure zero trim, 13 process variables, 8 PV, 4 PVAO, 4, 16 —R— recall page, 19 —S— sensor, 10 sensor trim, 13, 17 serial communication, 3 series resistor, 3 service operations, 12 setup basic, [...]