Vaisala HMT330 - Manual (Page 47)

Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 45
0503-033
Figure 27 Cleaning of Tightening Cone
The following numbers refer to Figure 27 above:
1 = Fitting screw
2 = Sealing washer
3 = Tightening cone
4 = Clean cotton stick
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.
NOTE When installed in a process with a pressure differing from normal
atmospheric pressure, please enter the pressure value of the process
(in hPa or mbar) into the transmitter memory using the display/keypad
option, using the serial line (see section PRES and XPRES on page 104),
or using the Modbus protocol (see Configuration Registers on page 203).
HMT335 for High Temperatures
HMT335 is installed similarly as the HMT333 probe but without the
supporting bar. Refer to Appendix A on page 185 for more information
on the duct installation kit for HMT335.
To avoid incorrect humidity readings, the temperature differences
between inside and outside of the duct must not be remarkable.