WIKA PSD-31 - Manual (Page 18)

18 WIKA operating instructions pressure switch model PSD-3x
GB
11430486.06 02/2012 GB/D/F/E
6. Commissioning, operation
Connection diagrams
Zero point adjustment
Check the indicated zero point on the display during commissioning.
Should an offset be displayed as a result of installation, this can be reset in programming mode with the
0SET parameter
■ Carry out zero point adjustment for relative and vacuum pressure measuring ranges in a
depressurised state.
■ Carry out zero point adjustment of absolute pressure ranges from 0 bar absolute
(vacuum). Since appropriate references are required for this, we recommend that this is
only carried out by the manufacturer.
6.2 Making the electrical connection
■ The instrument must be earthed via the process connection!
■ The power supply for the pressure switch must be made via an energy-limited electrical circuit in
accordance with section 9.3 of UL/EN/IEC 61010-1 or an LPS to UL/EN/IEC 60950-1 or class 2 in
accordance with UL1310/UL1585 (NEC or CEC). The power supply must be suitable for operation
above 2,000 m should the pressure switch be used at this altitude.
■ For cable outlets, make sure that no moisture enters at the cable end.
Circular connector M12 x 1; 4-pin
Assignment
U
+
U- S
+
SP1 SP2
1 3 2 4 2
Circular connector M12 x 1; 5-pin
Assignment
U
+
U- S
+
SP1 SP2
1 3 5 4 2