Honeywell ST 3000 User Manual page 84

7— Start-up - Flow Measurement with DP Transmitter
Step
2 Open equalizer valve C.
Refer to Figure 28 for sample piping arrangement.
3 Open valves A and HP block-off to make differential pressure zero (0) by applying same
pressure to both sides of meter body.
Allow system to stabilize at full static pressure—zero differential.
4 At the "Online" menu, read the applied input pressure (PV).
Also check that the PV analog output displays a corresponding zero input pressure.
5 Check that milliammeter reading is 4 mA (0%) output.
If communicator and milliammeter readings are...
• exactly 4 mA, then go to Step 9.
• not exactly 4 mA, then go to Step 6.
6 From "Online" menu, step through the following menu selections:
• Device setup
• Diag/Service
• Calibration
• Zero trim
Under "Zero trim" do the following when prompted:
7
• Remove the loop from automatic control, then press OK.
• Press OK when warned that this will affect sensor calibration.
Press OK when "Apply 0 input to sensor." display appears.
•
You will receive a message telling you that the sensor input is stabilizing, then the sensor zero
succeeded.
• Return the loop to automatic control, then press OK.
8 Press HOME to return to "Online" menu. Repeat Steps 4 and 5.
Close equalizer valve C.
9
10 Open valve B and LP block-off valve to begin measuring process differential pressure.
11 Take communicator and milliammeter readings to check that output signal does correspond to
applied input pressure.
If readings do not correspond, check that transmitter has been installed correctly. If applicable,
blow down piping to be sure no foreign matter is entrapped in it.
Check communicator and milliammeter readings again. If readings are still not correct, verify
transmitter's configuration data and change its range setting, if necessary.
12 Remove communicator and milliammeter from loop.
70 ST 3000 HART Transmitter Release 300 User Manual
Action
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