How to Use the Fluke 718Ex to Calibrate a Pressure Switch

How to Use the Fluke 718Ex to Calibrate a Pressure Switch - It is important to be familiar with intrinsically safe work practices before performing any maintenance task in a classified area where explosive gasses may be present. Be sure to take proper precautions and refer to the 718Ex users manual and Fluke 718Ex CCD before proceeding.

1. Depressurize and isolate the pressure switch from the process. If opening the switch exposes voltages or energy that is not intrinsically safe, use a continuously monitoring gas detector to monitor for the presence of explosive gasses.
2. Plumb the 718Ex and make connections as per the illustration.
3. Turn on the 718Ex and open the vent valve. Press the Zero button to clear the zero offset. Close the vent.
4. Press the Switch Test button to enter the switch test mode.
5. Apply pressure slowly with the hand pump until you approach the setpoint. Using the fine adjust vernier adjust the pressure until the switch opens and OPEN is displayed on the 718Ex.
6. Release the pressure slowly using the fine adjust vernier until RCL is displayed.
7. Press the Switch Test button once to read the pressure values for switch opening and again to see the pressure at switch closing. 
8. Press and hold the Switch Test button for 3 seconds to clear the test results and start over.
9. Adjust the pressure switch setpoint until the switch contacts open and close at the desired pressure.
10. Continue to monitor for explosive gasses until the switch is returned to service and all non-IS voltages or energy sources are isolated from exposure to the classified environment.

Fluke 700 PCK Calibration Kit
The Fluke 700PCK Pressure Calibration Kit makes it possible to calibrate your pressure modules at your facility using your own precision pressure standards. The kit consists of a power supply, an interface adapter, appropriate cables, and Fluke 700PC Pressure Module Calibration software. When installed on your PC, the Windows®-based software easily steps you through an as-found verification, a calibration adjustment, and an as-left verification. Calibration data is captured for import to your database. A 386 or better PC, running Windows 3.1, or later is required, along with a precision pressure standard with an uncertainty of less than 1/4 that of the pressure module being verified.

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