WIKA TR10-B - Handbuch (Seite 14)

3132465.01 07/2011 GB/D
14 WIKA operating instructions resistance thermometers per EN 14597
GB
■ Only use circular cross-section cables (if necessary, slightly oval in cross-section)
■ Do not twist the cable
■ Repeated opening/closing is possible; however only if necessary, as it might have a
detrimental effect on the protection class
■ For cable with a pronounced cold-flow behaviour the screw connection must be fully
tightened
6.3 Parallel threads
If the thermometer connecting head, neck tube, thermowell or process connection are
connected to parallel threads (e.g. G ½, M20 x 1,5 ...), these threads must be secured by
means of seals preventing liquids from penetrating into the thermometer.
As standard, WIKA uses copper profile seals for the connection between the neck tube
and the thermowell, and flat paper seals for the connection of the connection head and the
extension neck or thermowell.
If the thermometer and the thermowell are already connected, the seals will already be
mounted. The plant operator must check whether the seals are suitable for the operating
conditions and must replace them, if necessary, with suitable seals.
For thermometers without a thermowell, and/or where these are delivered separately, the
seals are not included and must be ordered separately.
Tighten the threads by hand when carrying out the final assembly on the plant. This will
correspond to the delivery status of the premounted components. The final tightening torque
should be applied using a spanner (half rotation).
The seals must be replaced after dismantling!
The seals can be ordered from WIKA, indicating the WIKA order number and/or
the designation (see table).
WIKA
Order No.
Description Suitable for threads
1605933 D15 x D21 x 1 -NP-Univ M24 x 1.5
0479632 per DIN 7603 D16.2 x D21.9 x 1.5 -2.0060 M24 x 1.5
(Head neck tube/thermowell)
Legend:
NP-Univ = Novapress universal
(2.0060 = E-Cu57 per DIN 1708)
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6. Commissioning, operation