USER'S GUIDE____________________________________________________________________
58 _______________________________________________________________ M210619EN-C
CHAPTER 5
MEASURING AT OVERPRESSURE
This chapter contains important information concerning the use of
HMT310 in overpressure conditions.
HMT314 and HMT318 are designed for humidity measurement at
overpressure. The maximum measurement pressures depend on the
probe as follows:
- HMT314: 0 ... 100 bar (10 MPa), for pressurized rooms and
processes, probe is provided with a nut, fitting screw and sealing
washer
- HMT318: 0 ... 40 bar (4 MPa), for pressurized pipelines, ball valve
set available
The actual pressure in the sampling cell needs to be set to the
transmitter by using the serial line command PRES (Set Ambient
Pressure for Calculations).
CAUTION
In pressurized processed it is essential to tighten the supporting nuts
and screws very carefully to prevent loosening of the probe by the
action of pressure.
Pressure Regulator Recommended
When sampling pressurized processes exceeding the maximum
measurement pressure of the probe, the pressure in the measurement
chamber must be regulated to acceptable level or below. It is
recommended to use a pressure regulator before the measurement
chamber to prevent significant pressure variations.
