Humidity Adjustment - TESTO 440 Instruction Manual

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4 Operation

Humidity Adjustment

4.3.8 Humidity adjustment
For humidity adjustment, the measurement parameter of the connected probe
is adjusted to the reference value at the two standard adjustment points 11.3%
RH and 75.3% RH; any deviations between the measuring value and the
nominal value are minimised across the entire measuring range.
The Testo calibration set provides a reference value to calculate the offset for a
humidity adjustment.
Humidity adjustment is possible with the following probes:
Order number Name
0636 9771 High-precision temperature-humidity probe with
Bluetooth
0636 9772 High-precision temperature-humidity probe, fixed cable
0636 9731 Temperature-humidity probe with Bluetooth
0636 9732 Temperature-humidity probe, fixed cable
0636 9775 Robust temperature-humidity probe for temperatures up
to +180 °C, fixed cable
testo 440 is switched on and the corresponding probe is connected.

Probe is already exposed to reference conditions (e.g. salt pot) for an
adequate adjustment time.
Adjustment time for humidity probe: at least 30 minutes.
You are in the Humidity Adjustment menu.

1
Select the relevant reference point of 11.3 or 75.3% RH with
2 Select the probe to be adjusted.
3
Use to select Adjust and confirm with

An information window displays the remaining adjustment time and
the adjustment is carried out.

An information window displays the text Adjustment successful!.
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