WIKA S-20 - Manual (Page 19)

19 WIKA operating instructions pressure transmitter, model S-20
14043170.02 07/2014 GB/D/F/E
GB
6. Commissioning, operation
6.2 Electrical mounting
Only use original accessories. For accessories see data sheet PE 81.61.
WARNING!
The instrument shield does not act as a protective conductor for protection of personnel, rather as a
functional ground in order to shield the instrument from electromagnetic fields.
6.2.1 Connection assembly
■ For instruments with ratiometric output signals, a shielded cable must be used. The cable shield must be grounded,
if the cable is longer than 30 m or leaves the building.
■ Use a cable with suitable characteristics for the particular operating conditions.
■ For cable variants, strain relief must be employed.
■ Cable with ventilation tubes must be vented to atmosphere.
■ The instrument must be earthed via the process connection!
■ Select a cable diameter that matches the cable gland of the plug. Make sure that the cable gland of the mounted
plug has a tight fit and that the seals are present and undamaged. Tighten the threaded connection and check that
the seal is correctly seated, in order to ensure a tight seal.
■ For cable outlets, make sure that no moisture enters at the cable end.
■ Pin assignment see test report.
6.2.3 Setting up a voltage supply
The voltage supply is made via a power supply unit or a control unit which provides the energy limitation.
The power supply for the pressure transmitter must be made via an energy-limited electrical circuit in accordance with
section 9.4 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 transmitter be
used at this altitude.