Concrete Encounter CME 4
User Guide
24/08/04
How it works
The instrument operates on the principle that the electrical
impedance of a material varies in proportion to its moisture
content. The electrical impedance is measured by creating a
low frequency alternating electric field between the
electrodes as illustrated in the diagram below.
Transmit Electrode
Material sample
under test
Alternating Electric Field
Receive Electrode
Concrete Encounter CME 4
Concrete Encounter CME 4
Spring loaded pins
Glass fibre board
Copper electrode
Pins fully compressed
Instrument in free air
Instrument pressed on to material surface to measure/detect
moisture content
This field penetrates the material under test. The very small
alternating current flowing through the field is inversely
proportional to the impedance of the material. The
instrument detects this current, determines its amplitude and
thus derives the moisture value.
3
CME4/1005
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