Advertisement
Surface Electrodes M 20-OF 15
Surface measurements should only be taken when the wood moisture content is below 30 %
m.c. For surface measurements on already machined stock, the two hexagon cap nuts have
to be unscrewed and replaced with the surface measuring caps. For measurement, the two
contact pads have to be pressed across the grain onto the stock to be measured. The measur-
ing depth is about 3 mm, so when testing thinner stock several boards have to be laid on top
of one another for measurement. Do not measure thin boards on metal bases.
Wood particles adhering to the measuring surface should be removed at regular intervals. If
the flexible plastic pads are damaged, new ones can be ordered
using a commercially available instant adhesive on cyanate basis.
Ram-in Electrode M 18
The two needles of the ram-in electrode have to be driven to the required measuring depth,
across the grain, using the sliding hammer. For determining the average moisture content, the
same measuring depth as described with electrode M 20 is required.
The pins must not be driven into the wood until the cap nuts are in touch with the
wood to be measured to avoid a possible damage to the electrode. Stop hammer-
ing when the gap between the cap nuts and the wood is still about 5 mm.
The needles are withdrawn by striking upwards with the sliding hammer. Prior to a series of
measurements, the cap nuts should be tightened by means of a spanner. Loose needles may
easily break.
(Ref. No. 4316)
13
and stuck on
Advertisement
