WIKA TR10-A - Handbuch (Seite 21)

WIKA operating instructions RTD and TC, intrinsically safe designs (Ex i)
3345267.12 01/2014 GB/D
21
GB
■ 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
6.6 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 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.
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 ; filled with asbestos-free sealing material
Al = Aluminium Al99 ; F11, 32 to 45 HB b
StFA = Soft iron, 80 to 95 HB a ; filled with asbestos-free sealing material
6. Commissioning, operation