Pressure Measurements - ABB 2600T Series Instructions For Installation And Commissioning

PHASE 4 - TRANSMITTER OPERATION
5.3

PRESSURE MEASUREMENTS

1. Slowly open the gate valve to admit process fluid to primary
of side H.
2. Vent all entrapped air (liquid service) or drain any condensate
(gas service) from primary using the vent/drain valve.
3. Close the gate valve.
4. Bring the process to the desired zero reading condition, i.e.
as an example:
a. In case of dry leg open the drain valve to bring the
primary to atmospheric pressure.
b. In case of wet leg slowly open the filling tee (and make
sure to have the wet leg completely filled-in).
5. The output should be 4 mA dc. If not:
a. Rotate the nameplate to get access to the external push
buttons.
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b. Push the zero (Z) button on top of the transmitter (figure
5.3) for at least 2 seconds.
c. The output goes to 4 mA, and if present the Integral
Display, the message "ZERO PASS" will appear.
d. If the output is not 4 mA or the message "WRITE
DISABLE" appears on the Integral Display, check the
Dip switches settings (you need to open the cover on the
electronic side and to pull out the integral display: see
figure 5.1).
e. In case of other diagnostic messages, see the reference
manual.
6. Close any open filling tee and drain valve.
7. Open the gate valve.
Filling
tee
Gate
valve
Vent/drain
valve