Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 27
1.
Remove the fitting screw from the nut and the probe.
2.
Fasten the fitting screw to the chamber wall with a sealing washer.
Tighten the fitting screw into the threaded sleeve with a torque
spanner. The tightening torque is 150 ± 10 Nm (110 ± 7 ft-lbs).
3.
Insert the body of the probe into the fitting screw and tighten the
nut manually to the fitting screw.
4.
Mark both the fitting screw and the nut hex.
5.
Tighten the nut a further 30º (1/12) turn or if you have a torque
spanner tighten it with a torque of 80 ± 10 Nm (60 ± 7 ft-lbs).
6.
Clean and grease the tightening cone of the fitting screw after every
tenth detachment. Change the sealing washer every time the fitting
screw is detached. Use high-vacuum grease, for example Dow
Corning, or a similar grease.
0505-272
Figure 9
HMP364 Probe Mounting
NOTE
When retightening the nut after detachment the nut must be tightened
without increased effort.
The following numbers refer to
1
=
Tightening cone
2
=
Nut
3
=
Fitting screw, M22×1.5 or NPT 1/2"
4
=
Sealing washer
5
=
Probe; ø12 mm
