Instruction Manual PUC 28
11
Terminal
Connection description
Description
1
EARTH
Ground connection
2
RL1_NO
Normally open contact
Relay 1
3
RL1_Common
Common
4
RL1_NC
Normally closed contact
5
RL2_NO
Normally open contact
Relay 2
6
RL2_Common
Common
7
RL2_NC
Normally closed contact
Table 2: Terminal assignment, relay connector (in some variants of the PUC 28 the relay contacts and
therefore also the relay connector are not present)
Pressure input port at rear side
(input for measurement)
Description
+P
Positive pressure
- P
Negative pressure
Pressure input port at front side
(input for re-calibration)
Description
+P
Positive pressure
- P
Negative pressure
(The input for re-calibration is only available at the device variants
“PUC 28/K”.)
Table 3: Assignment of the pressure input ports