WIKA OBSOLETE PS-20 Mode D'emploi page 8

7. Starting, operation
Remove the protection cap only just before installation and absolutely avoid any damage to the
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diaphragm during installation as well (PS-21).
For Model PS-20 you have to provide for a sealing element; exceptions are instruments with self-sealing
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threads (e.g. NPT thread). For Model PS-21 the sealing ring is included in delivery.
Please refer to our data sheet "Pressure gauge sealing washers AC 09.08" in WIKA's product catalog
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Pressure and Temperature Measurement or our website www.wika.de for details about sealing washers.
When mounting the instrument, ensure that the sealing faces of the instrument and the measuring point
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are clean and undamaged.
Screw in or unscrew the instrument only via the flats using a suitable tool and the prescribed torque. The
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appropriate torque depends on the dimension of the pressure connection and on the sealing element
used (form/material). Do not use the case as working surface for screwing in or unscrewing the instru-
ment.
When screwing the switch in, ensure that the threads are not jammed.
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For tapped holes and welding sockets please see Technical Information IN 00.14 for download at www.
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wika.de-Service
Electrical connection
Connect the instrument to earth via the pressure connection.
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The instrument must be grounded via the process connection!
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The power supply for the pressure transmitter must be made via an energy-limited electrical circuit in
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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 transmitter be used at this altitude.
Ingress protection per IEC 60529 (The ingress protection classes specified only apply while the pressure
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switch is connected with female connectors that provide the corresponding ingress protection).
Ensure that the cable diameter you select fits to the cable gland of the connector. Ensure that the cable
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gland of the mounted connector is positioned correctly and that the sealings are available and undama-
ged. Tighten the threaded connection and check the correct position of the sealings in order to ensure the
ingress protection.
Please make sure that the ends of cables with flying leads do not allow any ingress of moisture.
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Don't connect lines within a building which are longer than 30 m, or leave the building (including lines of
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outdoor installations).
8 WIKA Operating instructions / Betriebsanleitung / Mode d'emploi
GB
PS-20, PS-21