Table 32 Starting Up Dp Transmitter For Liquid Level Measurement In Pressurized Tank - Honeywell ST 3000 User Manual

7— Start-up - Liquid Level Measurement – Pressurized Tank
ATTENTION
For the procedure in Table 32, we are assuming:
• The tank is empty and the reference leg is filled.
• The high pressure (HP) side of the transmitter is connected to the wet reference leg. Note
that the transmitter will work if the HP side is connected to the bottom of the tank, but not
within the guaranteed accuracy specifications.
• The transmitter is mounted below the zero level of the tank, so "h" is greater than zero. If h
equals zero, plug C is eliminated from the piping and the LP vent is opened instead.

Table 32 Starting Up DP Transmitter for Liquid Level Measurement in Pressurized Tank

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
with a differential pressure-type transmitter.
2 Close block-off valves A and B.
Refer to Figure 31 for sample piping arrangement.
3 Open plugs C and D.
Allow system to stabilize at head pressure.
4 At "Online" menu, read present LRV setting.
5 From "Online" menu, step through the following menu selections:
Device setup
•
• Diag/Service
• Calibration
Apply values
•
You will be warned to remove the loop from automatic control. After doing so, press OK to
continue.
When the following display appears,
6
choose 4mA, then press ENTER.
A display will prompt you to apply new 4 mA input. Press OK.
76
ST3000: PT 3011
Set the:
1 4mA
2 20mA
3 Exit
ST 3000 HART Transmitter Release 300 User Manual
Action
ABORT ENTER
10/05