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For stock with uniform moisture content, non-insulated pins can be used, whereas for all
other applications insulated pins making contact only with their uncoated tip having a uniform
contact area with the wood, regardless of the penetration depth, should be used. Any change
in meter readings taken with insulated pins at different penetration depths clearly reflect an
actual change in moisture content representing the existing moisture gradient.
Drive-in Electrode M 20
Drive the electrode into the wood with the needles across the grain (the electrode body is
made of impact-resistant plastic). When withdrawing the electrode, the pins can be loosened
by slight sideways rocking movements across the grain.
For determining the average moisture content, the pins have to be driven to a depth of
approx. 1/4 to 1/3 of wood thickness.
When the M 20 electrode is supplied with the meter as initial equipment, 10 spare pins 16
and 23 mm long are included in the delivery. They are suitable for testing wood up to 30 mm
and 50 mm thick respectively.
If thicker boards or planks are to be measured, the needles can be replaced by longer ones.
Naturally, the liability to breakage and/or bending increases with the length of the pins, espe-
cially when withdrawing them. Therefore, it is recommended to use the ram-in electrode M 18
for testing thicker wood.
The cap nuts should be tightened by means of a spanner. Loose needles may easily break.
Summary of Contents for HYDROMETTE HB 30
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