How It Works - TRAMEX Concrete Encounter CME 4 Guide De L'utilisateur

Concrete Encounter CME4

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.
Glass fibre board
Copper electrode
Spring loaded pins
Instrument pressed on to material surface to measure/detect
Pins fully compressed
Material sample
under test
Alternating Electric Field
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.
User Guide
Instrument in free air
Concrete Encounter CME 4
Transmit Electrode
moisture content
Concrete Encounter CME 4
4
CME4/0908
Receive Electrode