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3.4.2
Full Span Adjustment
•
For full span adjustment, ensure that the vessel is filled with process medium to the
maximum level.
•
Maintain static pressure value within the minimum and maximum pressure range.
•
Using local push buttons set output for lower and upper limit of the full scale i.e.,
4mA and 20mA, refer to section 5.2 of this manual for detailed key operations.
•
The device is now ready for the real-time process measurement.
•
The URV and LRV can be set with Hart or Push buttons.
3.5
Product Usage
3.5.1
Pipeline pressure measurement: Pressure Transmitter
For high temperature steam measurements, pre-inject more than half-tube cooling
water in the condenser. Once the steam pipes are stable, gradually open the shut-off
valve to start measurement.
3.5.2
Pipeline pressure measurement: Differential Pressure Transmitter
For high temperature steam measurement in a pipeline by differential pressure transmitter,
pre-inject cooling water into the guided pipe. Once the steam pipes are stable, slowly open
the shut-off valve and start measuring.
Differential pressure transmitters are commonly used for micro pressure measurement of
hydrostatic pressures such as filter and equipment leakage tests for improving accuracy.
3.5.3
Steam Flow Measurement
For steam flow measurement, up-tilt the guiding pressure tube by 45°. Ensure that
transmitter installation location is at lower level than that of the process pipeline. Pre-
inject cooling liquid into the guiding pressure tube. Slowly open the shut-off valve to start
measurement. Periodically open the drain vent to clear the residual steam from guided
pipeline to improve the measurement accuracy.
3.5.4
Liquid Flow Measurement
For liquid flow measurement, tilt down the guiding pressure tube by 45°. Ensure that
transmitter installation location is at lower level than that of the process pipeline. Pre-
inject cooling liquid into the guiding pressure tube. Slowly open the shut-off valve to
start measurement. Periodically open the drain vent to clear the residual liquid, which
will improve the measurement accuracy.
3.5.5
Air Flow Measurement
For liquid flow measurement, up-tilt the guiding pressure tube by 45°. Ensure that
transmitter installation location is at lower level than that of the process pipeline. Pre-
inject cooling liquid into the guiding pressure tube. Slowly open the shut-off valve to start
measurement. Periodically open the drain vent to clear the residual gas from the guiding
pressure tube, which will improve the measurement accuracy.
3.5.6
Open Container Level Measurement: Single Flange Level Transmitter
Verify the process medium compatibility in case of open container level measurement.
