Instructions

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4.5.3 RH calibration (HD21ABE17 only)
This procedure applies to HD21ABE17 instrument.
Before starting the calibration operation, you should check if you need a new calibration using the
saturated solutions at 75.4%RH and 33%RH: You should proceed with the calibration, only if you
find an error in one of the two above calibration points.
The calibration procedure removes the previous calibration data.
For a correct calibration of the sensor, the first point should be 75%RH and the second point
33%RH.
Use the arrows ▼▲ to select the 3) Calibration RH item:
PROBES CALIBRATION
1) Calibration CO
2
2) Calibration CO
3) Calibration RH
▼▲ select
<ESC> exit/cancel
<ENTER> confirm
Confirm with ENTER. The following screen will appear:
PROBES CALIBRATION
CALIBRATION RH
1) Cal RH 75%
2) Cal RH 33%
▼▲ select
<ESC> exit/cancel
<ENTER> confirm
1. Use the arrows ▼▲ to select the 1) RH Cal 75% item; you will get the following page:
PROBES CALIBRATION
CALIBRATION RH
CAL RH 75%
Actual T = 22.0°C
Actual RH = 28.1%
RH 75% = 70.2%
▼▲ set
<ESC> exit/cancel
<ENTER> confirm
2. Use the arrows ▼▲ to enter the RH 75% nominal value.
3. Check that the salt solution container contains simultaneously:
• Salt in solid state
• Liquid solution and wet salt.