Vaisala HMT360 - Manual (Page 46)

User’s Guide ______________________________________________________________________
44 ___________________________________________________________________ M010056EN-J
Power ON/OFF
Open the transmitter cover and flip the internal power switch to position
ON (up), see
Figure 24 on page 62 .
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 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.
Otherwise, the LED indicates the following:
- LED blinking = calibration of the dry end (offset).
- LED lit = calibration of the wet end (gain).
WARNING Avoid static discharge. Always use a wet cloth for wiping the display.
WARNING Avoid static discharge. Always use a wet cloth for wiping the display.
NOTE If calibration is concluded but DIP switch settings are not restored, the
LED indicator keeps blinking.