EN
5. Commissioning, operation
14150915.07 11/2020 EN/DE/FR/ES
WIKA operating instructions, models TRxx and TCxx 19
5.4.5 Tightening torques for the thermometer
Ϯ
Only ever screw in, or unscrew, the instrument via the spanner flats and to the
prescribed torque using an appropriate tool.
Ϯ
The correct torque depends on the dimensions of the connection thread and the sealing
used (form/material).
Ϯ
When screwing in or unscrewing the instrument, do not use the connection head as
contact surface.
Ϯ
When screwing in the instrument, please observe that the threads are not skewed.
Connection head, selectable (example)
Thread Tightening torques
Connection head material
Aluminium Stainless steel
1/2 NPT T. F.F. T 2 - 3
1)
T. F.F.T 2 - 3
1)
3/4 NPT T. F.F.T 2 - 3
1)
T. F.F.T 2 - 3
1)
M20 x 1.5, with counter nut
2)
23 Nm 25 Nm
M24 x 1.5, with counter nut
2)
27 Nm 30 Nm
Tightening torques between connection head and neck tube
Tightening torques for connection to thermowell
Thread Tightening torques
1/2 NPT T. F.F.T 2 - 3
1)
3/4 NPT T. F.F.T 2 - 3
1)
G 1/2 B 35 Nm
G 3/4 B 40 Nm
M14 x 1.5 25 ... 30 Nm
M18 x 1.5 35 Nm
M20 x 1.5 35 ... 40 Nm
M27 x 2 40 ... 45 Nm
1) Turns from finger tight (T.F.F.T)
2) Only for versions with fabricated neck tube
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