Operation of the Transmitter Yamatake Corporation
5-46 ST3000 Smart Transmitter Series 900 Electronic Differential Pressure/Pressure Transmitter
5-8 : Zero-point Adjustment -- Based on Actual Liquid Level
Zero point can be adjusted during liquid level measurement without actually lowering
to zero the liquid level. The transmitter output can be adjusted to the actual level,
based on the actual liquid level measured with a level gauge.
An example of liquid level measurement in a closed tank (by the wet leg method) is
show, below.
Figure 5-5 Zero Adjustment during Liquid Level Measurement
Procedure
Use these procedures to adjust the transmitter output value to the actual level during
liquid-level measurement, based on the actual liquid level.
It is assumed that the zero point is adjusted under the following conditions:
• Low limit : 1000 mm (0%)
• High limit : 0 mm (100%)
• Liquid level measured with level gauge: 500 mm (50%)
• Display on SFC : 45%
Tank
High pressure side flange
Low pressure side flange
Transmitter main unit
Mounting bracket
Pipe stanchion
Capillary tube
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