WIKA RTD User Manual

3345267.08 06/2011 GB/D
20 WIKA operating instructions RTD and TC, intrinsically safe designs
GB
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Repeated opening/closing is possible; however only if necessary, as it might have a
detrimental eect on the protection class
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For cable with a pronounced cold-ow behaviour the screw connection must be fully tightened
6.6 Parallel threads
If the thermometer connecting head, extension neck, thermowell or process connection are
connected with parallel threads (e.g. G ½, M20 x 1.5 ...), these threads must be secured using
seals which prevent liquids from penetrating into the thermometer.
As standard, WIKA uses copper prole seals for the connection between the neck tube and the
thermowell, and at 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 nal assembly on the plant. This will
correspond to the delivery status of the premounted components. The nal 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.
Designation Suitable for
threads
11349981 per DIN 7603 Form C 14 x 18 x 2 -CuFA G ¼, M14 x 1.5
11349990 per DIN 7603 Form C 18 x 22 x 2 -CuFA M18 x 1.,5, G ⅜
11350008 per DIN 7603 Form C 21 x 26 x 2 -CuFA G ½, M20 x 1.5
11350016 per DIN 7603 Form C 27 x 32 x 2.5 -CuFA G ¾, M27 x 2
11367416 per DIN 7603 Form C 20 x 24 x 2 -CuFA M20 x 1.5
1248278 per DIN 7603 D21.2 x D25.9 x 1.5 -Al G ½, M20 x 1.5
3153134 per
DIN 7603 Form C D14.2 x D17.9 x 2 -StFA G ¼, M14 x 1.5
3361485 per
DIN 7603 Form C D33.3 x D38.9 x 2.5 -StFA G 1
Legend:
CuFA = Copper, max. 45HB
a
; lled with asbestos-free sealing material
Al = Aluminium Al99
; F11, 32 to 45 HB
b
StFA = Soft iron, 80 to 95 HB
a
; lled with asbestos-free sealing material
6. Commissioning, operation

WIKA RTD Specifications

General

Brand	WIKA
Model	RTD
Category	Measuring Instruments
Language	English