PF2100 4-20mA Input Card User Manual v1.2
©2021 Profire Energy Inc
June 2, 2021
Page 15
Calibrating the
“
Level
”
Current Loop
If your Level Transmitter is programmable, you should first verify that it is calibrated correctly. You should ensure that the transmitter outputs 20mA when the
tank is full and 4mA when it is empty. Alternatively, if your transmitter is not mounted at the bottom of the tank, you may want to program it to output more
than 4mA to indicate the volume of liquid that may be present in the portion of the tank below the transmitter. For some firmware versions, a Level Offset
feature is available which may be used to accomplish this.
After initial installation, the “Level” input on the 4
-20mA Input Card needs to be calibrated. The calibration data is stored in non-volatile memory on the Door
Card, not on the 4-20mA Input Card itself. For this reason, Input Cards cannot ship from the factory pre-calibrated. This calibration procedure should be
repeated whenever the Door Card or 4-20mA Input Card are replaced.
There are three steps to calibrating the “Level” Current Loop:
1.
Calibrate the Level Transmitter.
2.
Calibrate the
Zero Point for the “Level” Input on the 4
-20 Input Card.
3.
Calibrate the Span (Max Point) for the “Level” Input on the 4
-20 Input Card.
The calibration of the 4-20mA input card is done in Menu 7. To unlock the calibration menu hit the up and down arrow keys simultaneously.
Calibrating the Level Transmitter
This procedure will differ from device-to-device. In general, you may require a handheld process calibrator such as the Fluke 725 and a HART protocol
programmer. Consult the documentation for your Level Transmitter to determine the proper procedure for calibrating your device.
Calibrating the Level Input’s Zero Point
To calibrate the Level Input
’s Zero Point
, you will need a handheld process calibrator such as the Fluke 725. Follow this procedure to calibrate the zero point:
1.
Navigate to Menu 7 and press OK. Cycle through the submenu items until
“4
-
20 Level Zero Calibration = No”
is displayed on the PF2100.
2.
Press the Up or Down key to begin the calibration process. The display will now read “Apply 4mA then press OK”
.
3.
Turn on the process calibrator and set it to source a current of 4mA (0%).
4.
Disconnect the wire from the “Level” input and instead attach the process calibrator’s positive lead in its place.
5.
Connect the process calibrator’s negative lead
to the ground pin on the 4-20mA Input Card.
6.
Press the “OK” key on the PF2100. The message “Calibrating Wait…” will appear for several seconds
followed by the message “Parameter Set” after the
calibration has successfully completed.
7.
Disconnect the process
calibrator and reconnect the wire that was removed in step 4 to the “Level” input.
