Humidity And Temperature Adjustment - Vaisala HUMICAP HMT120 Serie Guía Rápida

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Humidity and Temperature Adjustment

NOTE
VAISALA _______________________________________________________________________ 11
To make a humidity or temperature adjustment (the same instructions
apply to both one-point and two-point calibration):
1. Open the transmitter cover and you can see three buttons
marked ADJ, + and -.
2. Press the ADJ button and hold it down until the green indicator
LED begins to blink slowly (800ms cycle time).
3. HMT120 transmitter is now in RH calibration state. Analog output
and optional display will still follow the actual measured RH value.
If you do not wish to perform the RH adjustment at this time, press
ADJ button one more time.
4. Remove the filter and insert the probe into a measurement hole of
the dry end reference chamber (for example, LiCl: 11 % RH) to do
the low humidity offset adjustment.
Do not touch the adjustment buttons before the conditions have
stabilized. This takes approximately 30 minutes.
5. Press either the - or + button at least once, make sure that the I
current is correct, adjust using the - and + buttons if needed, and
press the ADJ button again. The green indicator LED begins to
blink faster (400ms cycle time).
If you do not wish to perform the two-point RH adjustment at this
time, press the ADJ button one more time. Skip step 6.
If one-point calibration is done at more than 50% RH, a gain
adjustment is done instead of an offset adjustment.
6. Insert the probe into the high end reference chamber (for example,
NaCl: 75 % RH chamber in the humidity calibrator HMK15) and
do the high humidity gain adjustment by using the - and + buttons
to make sure the I
+ at least once even if the value is correct). To finish the RH
calibration, press the ADJ button. The green LED is now turned off
and the red indicator LED begins to blink slowly (800ms cycle
time).
7. HMT120 transmitter is now in T calibration state. Analog output
and optional display will still follow the actual measured T value.
If you do not wish to perform the T adjustment at this time, press
ADJ button one more time to finish the calibration, then skip the
rest of the steps.
8. Insert the probe into a known reference temperature (if HMK15
Humidity Calibrator is not used) and let the temperature reading
stabilize.
current is correct (you have to press either - or
out
out