EN
21WIKA operating instructions, models TRxx and TCxx
14150915.08 04/2024 EN/DE/FR/ES
5. Commissioning and operation
5.4.4 Tightening torques for the thermometer
■
Only ever screw in, or unscrew, the instrument via the spanner flats and to the
prescribed torque using an appropriate tool.
■
The correct torque depends on the dimensions of the connection thread and the seal
used (form/material).
■
When screwing in or unscrewing the instrument, do not use the connection head as
contact surface.
■
When screwing in the instrument, please observe that the threads are not crossed.
■
If M20 x 1.5 threads are loosened to the head with a counter nut, the IP degree
of protection can no longer be guaranteed. NPT threads to the head must not be
loosened by the customer. A PTFE/PFA lubricant is applied at the factory to the NPT
threads to the thermowell/protection tube. This must be renewed if the threads are
loosened by the customer.
■
The threads of the separable screw connection (union) do not need to be treated with
lubricant.
As-delivered condition: hand-tightened (approx. 5 Nm)
After aligning the connection head, the connection must be
secured using 50 ... 60 Nm.
Cable gland (metal)
Threads Tightening torques
½ NPT 20 Nm
¾ NPT 25 Nm
M20 x 1.5 20 Nm
(1/4000, 7/8000, PIH)
Figure shows the 7/8000 connection head
Threads Tightening torques
½ NPT The connection must not be disconnected
by the user.
¾ NPT The connection must not be disconnected
by the user.
M20 x 1.5 with
counter nut
After loosening the counter nut, the IP
degree of protection can no longer be
guaranteed.
Tightening torques between connection head and neck tube
Tightening torques for connection to thermowell/protection tube
Threads Tightening torques
½ NPT 30 Nm
¾ NPT 40 Nm
G ½ B 35 Nm
G ¾ B 40 Nm
M14 x 1.5 27 Nm
M18 x 1.5 35 Nm
M20 x 1.5 37 Nm
M27 x 1.5 42 Nm
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