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Humidity measurement
Material moisture probe, Part no. 0636.0365
Description:
The humidity sensor works according to the principle of relative permittivity measurement. The high
relative permittivity of water (approx. 80) is used to determine the moisture level. A high frequency,
electrical field penetrates the material being measured. Depending on the moisture, a value is
shown on the instrument display (not water level). This display value is different for every material.
The water level has to measured using the “dry and weigh method”.
Measurement:
When measuring ensure that the probe is lying firmly on the material being measured.
Note:
The output signal of the probe cannot be checked to see if the probe is still working properly. If the
contact is interrupted, the value in the display will remain at a value, depending on the scaling.
Connecting to testo 400 or testo 650 reference instruments :
1. Connect material moisture probe to channel 1 or channel 2.
2. Press to go to main menu.
3. Select “probe” - Confirm with .
4. Set “scaling” - Confirm with .
5. Select channel: right connection socket = Channel 2
left connection socket = Channel 1
Confirm with .
6. Select “%” - Confirm with .
7. Adjust using arrow buttons:
1.50 to 3.50 V (zero point and gradient value)
0000 to 0100
In order to produce greater measurement effects 0000 to 0200 or 0000 to 0300 can be set instead
of 0000...0100.
Note:
If dispersions occur when several probes are compared,
the scaling can also be individually modified.
To do this the measurement should first be carried out in the volt unit without scaling.
Measurement in air = zero point (instead of 1.5 V).
Measurement on metal = gradient value (instead of 3.5 V).
The individual zero point and gradient value can be input when scaling.
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