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Chapter 3 Starting and Stopping this Device
(2) Gradually open the stop valve on the high pressure side. When it is filled with process
fluid, close the valve.
(3) Set the differential pressure applied to the device to zero.
Gradually open the equalizer valve. Next, gradually open the high pressure side stop valve, and
introduce process pressure into the pressure-receiving part of the device. The device will attain
a state (the equalized pressure state) in which equal pressure will be applied to the high pressure
side and low pressure side of the device.
(4) Check that there are no pressure leaks in the connecting pipes, the three-way manifold valve,
the device itself, etc.
(iii) Zero point check and calibration
Procedure
(1) Check that, in the previous operation, the equalized pressure state was attained.
(2) Using the communicator, check the device output. If the output is not zero, calibrate the zero
point. For information regarding the zero point calibration procedure, see the operation manual
for the communicator.
Note:
Have the required equipment on hand before starting zero-point calibration.
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