TESTO 440, Instruction Manual

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3 Operation
19
About Device
- Name
- Serial Number
- Firmware Version
- Battery
- Memory
About Probe (visible once
probe is connected)
- Probe Name
- Serial Number
- Firmware Version
- Battery
Humidity Adjustment
See Section 3.3.8
3.3.8 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 need to go to menu screen first then select Settings and then
clicking on Humidity Adjustment.
1
Select the relevant reference point of 11.3 or 75.3% RH with .