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Chapter 3 Starting and Stopping this Device
3-5 Measurement Using the JTE Model
At the start of operation, make adjustments while the process is in its actual state.
3-5-1 Liquid Level Measurement
(1) Preparing for Operation
(i) Checking the minimum liquid level (zero position) and zero point input
during input equalization
The zero position liquid level is taken to be the center of the seal diaphragm on the surface of the
process connection flange of the device (see Figures 3-6 and 3-7). As a result, the measurement
range H extends from the center of the transmitter flange to the height of the usage range. However,
when performing the zero point check, lower the liquid level to a point below the bottom of the
seal diaphragm. The device must be in a state in which head pressure is not being applied by the
process fluid. That is, check the zero point after putting the diaphragms on the high pressure side
and the low pressure side into an equalized pressure state in the tank. For information regarding
the method of checking, see the operation manual for the communicator.
Figure 3-6. Minimum Liquid Level Characteristics
100% Level
0% Level
H
Zero Point
Check Level
Figure 3-7. Zero Position Determination
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