1. Preparation
Ensure that both high-pressure and low-pressure isolation valves are closed.
Confirm that the equalizing valve is in the open position.
2. Line Flushing
Open the drain valve.
Slowly open the primary process valve to flush the impulse lines.
Perform flushing at least twice.
Close the drain valve after flushing.
3. Cooling and Air Removal
Allow the impulse lines to cool to a safe temperature before proceeding.
If air vent valves are installed, briefly open them to expel any trapped air, then close them.
4. Filling and Zero Adjustment
Slowly open the high-pressure side isolation valve.
For steam or liquid applications, wait until the impulse lines are fully filled with condensate or liquid.
Loosen the drain screws on both the high and low-pressure chambers of the transmitter to release residual air.
Once the process fluid begins to emerge, tighten the screws securely.
Inspect for any leakage.
Check and adjust the transmitter’s zero point if necessary.
5. Final Valve Operation
Close the equalizing valve.
Gradually open the low-pressure side isolation valve.