71
Reference Manual
00809-0100-4809, Rev DA
Section 3: Commissioning
September 2015
Commissioning
6. Gently tap the transmitter body, valve manifold, and impulse piping to dislodge any
remaining entrapped air. If air remains, repeat Steps 4 or 5.
7. Close the low side primary instrument valve PL.
8. Check the transmitter zero by noting the output. If the signal reads outside the range
3.98 mA to 4.02 mA, air is probably still in the system; repeat the procedure from Step
2. Perform a zero trim procedure, if necessary.
9. Close equalizer valve(s).
a. For 3-valve manifolds, close valve ME.
b. For 5-valve manifolds, first close valve MEL, then close valve MEH.
10. Slowly open low side primary instrument valve PL. The system is now operational.
a. For 5-valve manifolds only: Open vent valve MV. If valve MV is leaking, valves MEH
and/or MEL are not fully closed or require repair. This must be done before taking
any readings. Close vent valve MV once verified.
Gas service
The following procedures assume the process pipe is pressurized to normal operating pressure
and should be followed to obtain a true zero at static or “pipe” pressure.
1. Ensure primary instrument valves PH and PL are open. Refer to Figure 3-5 for valve
designations.
2. Slowly open drain valves DVH and DVL to allow the condensate to drain.
3. Close drain valves DVH and DVL.
4. Close the primary instrument valves PH and PL.
5. Open valves ME, ML, and MH.
a. For 5-valve manifolds, first open valve MEH, then open valve MEL.
6. Slowly open the high side primary instrument valve PH.
7. Check transmitter zero by noting the reading. If the signal reads outside of the range
3.98 mA to 4.02 mA, condensate may be in the DP transmitter or system; repeat the
procedure from step 1 to remove any condensate. A signal outside the range 3.98 mA
to 4.02 mA can also be caused by system leaks; check for leaks in system. Perform zero
trim procedure, if necessary.
8. Close equalizer valve(s).
a. For 3-valve manifolds, close valve ME.
b. For 5-valve manifolds, first close valve MEH, then close valve MEL.
9. Slowly open the low side primary instrument valve PL. The system is now operational.
a. For 5-valve manifolds only: Open vent valve MV. If valve MV is leaking, valves MEH
and/or MEL are not fully closed or require repair. This must be done before taking
any readings. Close vent valve MV once verified.
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