Table 34 Starting Up Ap Transmitter For Pressure Measurement - Honeywell ST 3000 User Manual

7— Start-up - Pressure Measurement with AP
ATTENTION
For AP transmitters, you can only verify that the input and output readings correlate.
Step
1 Connect communicator across loop wiring; turn it on and establish communications. If
possible, locate communicator where you can also view receiver instrument in control loop. If
you want to verify transmitter output, connect a precision milliammeter or voltmeter in loop to
compare readings.
Refer to Figure 27 for sample communicator and meter connections in a typical analog loop.
2 Set process pressure to zero level, if possible.
Allow system to stabilize at zero pressure.
3 At "Online" menu, read applied input pressure (PV) which should be zero level.
Also read PV analog output which should be 4 mA to correspond with 0% output.
4 Optional (read output in % of range):
Read barometric pressure and confirm with local source, (for example, weather station, airport,
or other reference).
5 From "Online" menu, step through the following menu selections:
• Device setup
• Process variables
6 At "Process variables" display, read output. Compare local reference pressure with transmitter
in % of span. Check that milliammeter reading corresponds to output.
7 Take communicator and milliammeter readings to check that output signal does correspond to
zero and full-scale pressures.
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 needed.
8 Remove communicator and milliammeter from loop.
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Table 34 Starting Up AP Transmitter for Pressure Measurement.

ST 3000 HART Transmitter Release 300 User Manual 10/05