Application Note

ManualsBrandsFluke ManualsCalibratorsFluke 754 Documenting

Transmitter Calibration

with the Fluke 750 Series

Documenting Process Calibrator

754

DOCUMENTING PROCESS CALIBRATOR

TEST DC PWR

––

Fluke DPC

Rosemount 444

Application Note

1. Connect a type K mini-

connector into the “TC” input

of the DPC and connect to

the thermocouple input of

the transmitter (Figure 1). It

is necessary that you use the

correct type of mini-connec-

tor for this connection to the

DPC.

2. Connect the center two ter-

minals of the DPC to the con-

nections on the transmitter

where loop power is applied

(Figure 1).

Note: If you prefer to use house

loop power rather than supplying

loop power from the DPC, connect

these two leads in series with the

loop supply to the transmitter.

3. Once your connections are

made, starting from the DPC

power up state (or measure

screen), select the “mA” but-

ton to measure milliamps

(Figure 2).

Figure 1.

Calibrating a 2 Wire Thermocouple

Transmitter with the Fluke 750 Series

Documenting Process Calibrators

The transmitter in this example is a 2 wire trans-

mitter (needs loop power). The input stimulus for

this device is from a type K thermocouple with an

input range of 100 °C to 300 °C at 0 % and 100 %.

The output drawn against loop power is 4-20 mA

at 0 % and 100 % with a tolerance of 0.25 %. The

steps below show how to: 1) perform a three point

ascending (3↑) As Found (pre-adjustment) test at

0-50-100 %, and Tag the results, 2) adjust the

zero and span (span = 100 %) of the transmitter,

then 3) perform a three point ascending As Left

(post-adjustment) test at 0-50-100 %, Tag those

results and review them in memory.

The precision sourcing and measurement

capabilities of the rugged Fluke Documenting

Process Calibrator (DPC) make it an ideal choice

for the calibration of process instrumentation.

The following examples show how to address trans-

mitter calibrations quickly and effectively using the

Fluke 753 or 754 Documenting Process Calibrators.

Figure 2.

4. Next depress the “MEAS/

SOURCE” button; now you are

in the source screen.

Since you want to source a

thermocouple, press “TC/RTD”

once. Press ENTER to select

TC. Use the down arrow to

move the cursor to “K” and

then press “ENTER.” Select

“Linear T” and press ENTER.

The DPC will respond with

????? asking for a tempera-

ture to source. Depress “100”

and “ENTER” (Figure 3).

Figure 3.

Summary of content (8 pages)

PAGE 1
Transmitter Calibration with the Fluke 750 Series Documenting Process Calibrator Application Note The precision sourcing and measurement capabilities of the rugged Fluke Documenting Process Calibrator (DPC) make it an ideal choice for the calibration of process instrumentation. The following examples show how to address transmitter calibrations quickly and effectively using the Fluke 753 or 754 Documenting Process Calibrators.
PAGE 2
5. Next press the “MEAS/ SOURCE” button once and you will be in the split screen mode (Figure 4). Figure 7. Figure 4. Note: Skip to step 7 if you are measuring current in series using the house loop power source mentioned in step (2). 6. Next, depress the “SETUP” button on the DPC. The cursor should begin on loop power. Depress “ENTER,” down arrow until the DPC cursor is on Enabled and depress “ENTER.” Next depress the “Done” softkey (Figure 5). 8.
PAGE 3
and 4 Wire RTD Sourcing for the Fluke 750 Series Documenting Process Calibrators One of the most frequently asked application questions pertaining to the 750 Series Documenting Process Calibrators is, “How do I hook up the test leads to the DPC to source 3 and 4 wire RTDs?” For 3 and 4 wire RTD measurement, the DPC has embedded hookup diagrams that easily show you how to connect the DPC. However, for 3 and 4 wire RTD source, the DPC does not offer that assistance.
PAGE 4
Calibration of an I to P (Current to Pressure) with the Fluke 750 Series Documenting Process Calibrators A common device in the Fluke DPC workload is the I to P. The I to P device is used to convert electrical loop analog control of 4-20 mA to pneumatic analog loop control of 3-15 PSI. The device in this example is an I to P with current input values of 4-20 mA for 0 % and 100 % with output range of 3-15 PSI for 0 % and 100 %, +/- 2 %.
PAGE 5
6. At this point depress “As Found”, select “Instrument” and press “ENTER,” then fill in the template as shown in figure 16. 9. Now you see the Tag entry screen (Figure 18). Figure 18. Figure 16. Press “DONE.” You should now see the split screen, with soft key choices of “Abort,” “Auto Test” and “Manual Test.” 7. Select “Manual Test,” and watch the DPC start at 0 %. Once the reading has settled, depress “accept point.” Perform the 50 % and 100 % measurements the same way. 8.
PAGE 6
Calibration of a Pressure Transmitter (Pressure to Current or P to I) with the Fluke 750 Series Documenting Process Calibrators A common device in the Fluke DPC workload is the pressure transmitter or P to I device. The P to I device is used to convert pneumatic analog loop control signals of 3-15 PSI or other measured pressures to electrical loop analog control signals of 4-20 mA.
PAGE 7
8. At this point depress “As Found”, select “Instrument” and press “ENTER,” then fill in the template per Figure 24. Figure 24. Depress “DONE.” You should now see the split screen and are presented with soft key choices of “Abort,” “Auto Test,” and “Manual Test.” if you are sourcing 3.120 PSI (1% of span above nominal), the DPC will look for a mA reading of 4.160 mA (also 1% of span above nominal).
PAGE 8
Note on Uploading Results to Your PC If you are using a 743/744 or 753/754, you may choose an instrumentation management software package from this list: Fluke DPC/TRACK2™ AMS from Emerson Process Management, (formerly Fisher-Rosemount). PRM (Plant Resource Manager) from Yokogawa Electric Corporation. On Time Support Process/Track All trademarks are the property of their respective holders. Additional information is available for download from www.fluke.