Level Measurement - ABB 2600T Series Instructions For Installation And Commissioning

PHASE 4 - TRANSMITTER OPERATION
3. After venting or draining, output should be 4 mA 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
(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 a "WRITE DISABLE" message 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.
4. Close equalizing (C) valve.
5. Open low pressure (B) valve.
5.2

LEVEL MEASUREMENT

1. Vent all entrapped air from primary using vent/drain
valves on the transmitter, then close them.
2. Make sure to have the level in the tank at the required
reference (minimum) level.
✶
Note: In case it is not possible to empty the tank,
it is possible to follow the Zero Raise/Lower adjustment
procedure described in the reference manual.
3. In case of wet leg make sure to have it completely filled-
in with the proper liquid.
4. After venting, output should be 4 mA 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
(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 a "WRITE DISABLE" message 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.
Fig. 5.3 - Zero button
Gate
Max. Level
valve
Gate
valve
Min. Level
L
H
Vent/drain
valve
Drain
valve
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