User manual

Z24.0.06.6C-02 Operating Manual GSF 50TF and GSF 50TFK page 3 of 4

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4 Measurement Basics

The resistance of the medium between the conical metal

surfaces (1) and (2) is measured. The medium being

measured has to be compressed well enough.

The best is, having a constant pressure onto the medium

during the measurement. Do not release handle during the

measuring, otherwise the contact to the medium can be

interrupted, in this case a to dry value would be

measured.

Attention: Especially at bulk material stored outside or very wet

material, large distribution of the actual moisture values can

appear.

It is best to do several measurements and taking the

average in order to get meaningful results:

The measurement of wood chips or things like that is

depending on temperature. For an exact measuring result the

temperature is automatically compensated when using the

suitable instrument (e.g. GMH 3830). The temperature-

measuring is done at the tip of the probe (1), a sufficient time

to adjust the sensors temperature to the material has to be

waited for.

Different measuring results are depending on different types of

material. Select correct material-group or material type before

measuring. Refer to operation manual of the connected

measuring device. When pushing in the probes, oscillating

movements have to be avoided. Otherwise hollows between

the probes and the material may falsify the measurement.

5 Unit conversion: moisture dry-and wetbasis

Older instruments (e.g. GMH 3830 before V1.4) cannot be switched from moisture content u to w, in this

case the wet basis moisture content can be calculated like following:

Wet-basis moisture w [%] = 100 * Moisture content u [%] / (100 + Moisture content u [%])

Example: 1 kg of wet wood, which contains 500 g of water has a moisture content u of 50%

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150

wet-basis moisture content w [%]

moisture content u [%] = display of GMH 38x0

Conversion moisture content u - wet-basis moisture content w