EN
14302224.0
1
01/2023
EN/DE
Additional operating instructions TC82, TC83, intrinsically safe designs (Ex i)
10
3. Commissioning, operation
3.2 Tightening torques
■
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 sealing
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 skewed.
■
Assure that the purge gas connection is tighten and no gas can escape, so that there is
no carry-through between zones.
Connection head, selectable (example)
Thread
Tightening torques in Nm
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
23
25
M24 x 1.5 with counter nut
27
30
Thread
Tightening torques in Nm
Connection head material
Aluminium
Stainless steel
1/4 NPT
T.F.F.T 2 - 3
1)
T.F.F.T 2 - 3
1)
Tightening torques between connection head and neck tube
Tightening torques between purge connection and purge piping
1) Turns from finger tight (T.F.F.T)
