direction, as a measurement made more or less transverse on the grain direction gives a
lower indication. The measurement direction is formed by the brand name CAISSON
(Coinciding with the grain direction).
GENERAL PRINCIPALS OF OPERATION
The meter works by means of a electric field which will be influenced by water content of the
material and the density of the material itself. The relative measurements are displayed in the
15.00 scale in the right upper level of the display. Through selection on the front panel ( <, > a type
of wood or a wood-density ( indicated by D and a range in Kg per Cubic Meter ) can be selected.
The microcontroller calculates the corresponding moisture content in percents. If the display shows
--.-%, the value is outside the range of the instrument ( 7 to 40%). Selectable woodtypes may vary
per region. The instrument gives values up to 40%, above 20% however values may be incorrect if
the wood has a moist content above the fibre saturation point.
INDICATIONS
In general the read-out should be interpreted as follows:
WOOD
•
0 – 12%
= DRY: a finishing coat can be applied
•
12 – 20%
= AIR DRY: a finishing coat can only be applied with painting systems that
tolerate a base moisture content up to about 20%. The meter indicates: "moist"
•
20 – 30%
= WIND DRY: treatment can only take place with good moisture-permeable
media. When applying a number of coats, we recommend that you should wait for a drying
time or a decrease in the result of the device. The meter indicates: "wet".
•
30% and higher
= WET: treatment is in principle only possible with a painting system that
is suitable for wet wood.
The CAISSON meter gives an indication of the moisture present in any species of coniferous or
deciduous tree up to about 2 cm deep.
For concrete, anhydrite and polyester/GRP the readings are given in percentages. The indications
‘wet’, ‘moist’ and ‘ dry’ are just given as a general guideline and need proper interpretation based
on experience.
SWITCHING-OFF
Push the slide switch backwards. The display extinguishes. The instrument will otherwise power
down after 10 minutes. Before you can switch-on the instrument again the slide switch should be
in the "off" position first.
CAISSON Elektronik GmbH
Boschstrasse 16, D-47533 Kleve, Deutschland
tel: +49(0)2821-894390
www.caisson-gmbh.de
