20
impact resistant plastic). Take care that both pins of the electrode are driven only into the ma-
terial to be tested.
When withdrawing the electrode, the pins can be loosened by slight sideways rocking move-
ments. The cap nuts should be tightened by means of a spanner prior to a series of measure-
ments. Loose pins may easily break.
When the meter is supplied with the M 20 electrode as initial equipment, 10 spare pins 16
and 23 mm long (commercial steel nails) are included in the delivery. They can be used for
measurements up to a depth of 20 mm or 30 mm respectively. For measurements to greater
depths, the stick-in electrodes M 6 should be used which are supplied with pins 40 mm and
60 mm long.
Surface Measurement Caps M 20-OF 15
For surface measurements on smooth materials, the two hexagonal union nuts of the drive-in
electrode have to be unscrewed and replaced by the surface measurement caps. To perform
the measurement, the two contact surfaces should be firmly pressed onto the material being
measured. The measurement depth is about 3 mm. Particles adhering to the measurement
surface should be regularly removed. If the elastic plastic pads should once be damaged, they
can be re-ordered and stuck on using a commercially available instant adhesive on cyanate
basis.
Measuring errors can be caused by a contaminated or dirty surface
(e.g. oil).
Stick-in Electrode M 6
Summary of Contents for HYDROMETTE HB 30
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