Operation _________________________________________________________________________
Vaisala _________________________________________________________________________ 29
CHAPTER 5
OPERATION
Turn the transmitter on ON with the ON/OFF switch (Figure 9-1, item
2).
HMT360 with display
Measurement readings appear on the display after switching power
ON. The analog output signals can be read from the system or load
resistor.
HMT360 for Natural Gas
When switching on the HMT360 for natural gas, the existing pressure
setting appears on the display; the default setting is 1000 hPa (=1 bar
or 14.5 psi).
To modify the pressure setting, turn the transmitter's internal
CALIBRATION ENABLED
/
DISABLED
dip switch to position
ENABLED
(up). Adjust the pressure reading with buttons
▲
and
▼
on the
display cover; the adjustment step is 100 hPa). Acknowledge the value
with button E. To complete the pressure setting, turn the dip switch
back to position
DISABLED
(down). If the pressure setting is not
modified, the measurement readings appear automatically on the
display after 60 seconds.
NOTE
Avoid static discharge! Always use a wet cloth for wiping the
display.
HMT360 without display
If the transmitter does not have a display, the red LED indicator on the
cover indicates various phases of calibration and possible errors. In
normal operation it is not lit. If the LED is lit and all calibration or test
dip switches are disabled, it is an indication of an internal error.
