| Push-button calibration is not available for the additional temperature probe. |
You can calibrate and adjust HMP155 with the
adjustment buttons on the probe. Carry out the two-point humidity adjustment by using 2
relative humidity references: for example, saturated salt points 11 %RH (LiCl) and 75 %RH
(NaCl). The difference between the humidity reference points must be at least 30 %RH. The
difference between the temperature reference points must be at least 30 °C.
| In push-button calibration, the
probe outputs are by default relative humidity in the range 0 … 100 %RH in CH1 and
temperature in the range -40 … +60 °C (-40 … +140 °F) in CH2. |
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Before attempting calibration or adjustment,
set the probe to the adjustment mode by pressing and holding the ADJ
button until a green LED lights up. This turns off the heating and the additional
temperature probe if you are using either of them. After that HMP155 is ready to be checked
and calibrated and adjusted. Because the additional temperature probe is turned off during
the adjustment mode, you do not need to insert it into the same reference conditions with
the humidity probe.
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