Yamatake STD910 - 5-3-2-1: Preparation for Measurement; Gas Pressure Measurement

Operation of the Transmitter Yamatake Corporation
5-16 ST3000 Smart Transmitter Series 900 Electronic Differential Pressure/Pressure Transmitter
5-3-2 :Gas Pressure Measurement
5-3-2-1 Preparation for Measurement
 WARNING
• Ensure that the process is in the manual control mode.
If the process is in automatic control mode, switch to manual before starting the
procedure.
• Drain poisonous fluids with care, making provisions to protect personnel.
• Close the differential pressure output valve (main valve), the local valve,
the drain valve, and the gas vent plug. Refer to "Figure 4-11 Gas Pres-
sure Measurement - Piping".
How to measure gas pressure
Perform zero-point adjustment and introduce process pressure into the transmitter,
using this procedure:
• Zero-point adjustment
Step Description
1 Open both the high-pressure side and low-pressure side vent plugs and
open the pressure receiving part to the air.
2 Refer to procedure 2 on page 5-10. Perform zero-point calibration.
3 After completing zero-point calibration, close the high-pressure side vent
plug.