Caution – Vaisala HMT310 User Manual
Page 27
Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 27
The following numbers refer to Figure 8 on page 26:
1 = Tightening
cone
2 = Nut
3 = Fitting
screw
4 = Sealing
washer
5 = Probe; Ø 12 mm
6 = M22×1.5 or NPT 1/2"
5.
Tighten the nut a further 30° (1/12 turn) or if you have a torque
spanner tighten it with a torque of 80 ± 10 Nm (60 ± 7 ft-lbs).
0505-273
Figure 9
Marking the Nut
NOTE
After detachment the nut must be tightened without increased effort.
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; Down
Corning, Europe) or a similar grease.
See also Chapter 5, Measuring at Overpressure, on page 61.
CAUTION
In pressurized processes it is essential to tighten the supporting nuts and
screws very carefully to prevent loosening of the probe by the action of
pressure.