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PHASE 4 - TRANSMITTER OPERATION
5. TRANSMITTER OPERATION
Use the following step to adjust the transmitter zero.
5.1 PRESSURE MEASUREMENT
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 4mA dc. If not:
a. Rotate the nameplate to get access to the external push buttons.
b. Push the zero (Z) button on top of the transmitter (fig. 5.2) for at least 2 seconds.
c. The output goes to 4 mA, and if present the integralm 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 fig. 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.
Fig. 5.2 - Zero button
1
2
1
0
3
4
gate
valve
filling
tee
vent
valve
Fig. 5.1 - Default Dip switches setting
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