Vaisala HMT330 - Manual (Page 45)

Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 43
HMT333 for Ducts and Tight Spaces
The HMT333 is a small size (ø = 12mm) general-purpose probe suitable
for ducts and channels with the installation kit available from Vaisala.
The HMT333 provides for two measuring range options. The first probe
version is equipped with a flexible cable and can be used when
measuring in environments up to 80 ºC. The second version is suitable
for measuring in environments up to 120 ºC.
See Appendix A on page 185 for the following probe installation kits for
HMT333 and installation examples.
- Duct mounting kit
- Cable gland
HMT334 for High Pressure and Vacuum
Applications
The HMT334 probe is for the dewpoint measurements in pressurized
rooms and industrial processes. The probe is provided with a nut, a fitting
screw and a sealing washer. Keep the fitting screw and the nut in place
on the body of the probe during handling to prevent damage to the highly
polished surface of the probe. Follow the instructions below to achieve a
leak-tight assembly:
1. Remove the fitting screw from the nut and the probe.
2. Attach the fitting screw to the chamber wall with a sealing washer.
Tighten the fitting screw into the threaded sleeve with a torque
wrench. The tightening torque is 150 ± 10 Nm (110 ± 7 ft-lbs).
3. Insert the body of the probe into the fitting screw and attach the nut
manually to the fitting screw so that the connection feels tight.
4. Mark both the fitting screw and the nut hex.