EN
20
WIKA operating instructions, models TRxx and TCxx
14150915.08 04/2024 EN/DE/FR/ES
5.4.3 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.
■
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.
Connection head
BS, BSZ, BSZ-H, BSS, BSS-H, BSZ-K, BSZ-HK, KN4-A)
Figure shows the BSZ connection head
Threads Tightening torques
Connection head material
Aluminium Stainless steel
½ NPT The connection must not be
disconnected by the user.
M24 x 1.5 with male nut 27 Nm 30 Nm
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
5. Commissioning and operation
Threads Tightening torques
Metal Plastic
M20 x 1,5 20 Nm 12 Nm
½ NPT 20 Nm T. F. F. T 2-3
1)
1) Turns from finger tight (T.F.F.T)
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