Vaisala HMT120 - Manual (Page 55)

Chapter 5 _______________________________________________________________ Maintenance
VAISALA ________________________________________________________________________ 53
NOTE Do not touch the adjustment buttons before the conditions have
stabilized.
11. Using the - and + buttons, make the temperature gain adjustment
by making sure the I
out
current is correct (you have to press either -
or + at least once even if the value is correct).
12. Press the ADJ button one more time. The red indicator LED turns
off and the transmitter returns to normal mode. The calibration
procedure is now finished.
NOTE In case of calibration error, both LEDs blink alternately at a very fast
rate (cycle time 200ms) for a period of 2s after which the transmitter
returns to normal mode.
NOTE In case of using a HMT120 transmitter with display option, the
following texts are shown at the display during calibration:
"Probe cal: RH 1" corresponding the green LED blinking slowly
"Probe cal: RH 2" corresponding the green LED blinking fast
"Probe cal: T 1" corresponding the red LED blinking slowly
"Probe cal: T 2" corresponding the red LED blinking fast
"Probe cal: Error" corresponding both LEDs blinking alternately at
very fast rate