67
Reference Manual
00809-0100-4809, Rev DA
Section 3: Commissioning
September 2015
Commissioning
Figure 3-3. Valve Identification for Direct Mounted Annubar Sensor Models in Steam
Service
A. Hose connection
B. Hose connect valve
Steam service 3-valve manifold
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.
After flow has been started and allowed to reach operating conditions, a zero trim procedure
needs to be performed.
1. Using the drain/vent valves DVH and DVL; burp (carefully crack vents open and closed
to ensure that no air is present, this may need to be done more than one time.) Refer to
Figure 3-1 for valve designations.
Note
Step 1 would cause a loss of some water column in both the high and low sides, due to draining
of the water legs. If Step 2 is performed, the Annubar sensor assembly should be given sufficient
time to re-stabilize before continuing to Step 3.
2. Close the low side valve ML.
3. Open the Equalizer valve ME.
4. Check the transmitter zero by noting the output. If the signal reads outside of the range
3.98 mA to 4.02 mA then, perform a zero trim.
5. Close the Equalizer valve ME.
6. Open the low side valve ML, ensure that the high side valve MH is open. The system is
now operational
ML ME
MH
DVL
DHL
A
B
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