There are two main methods of MC measurement – Capacitance and Resistance.
Resistance Meters (Pin Meters)
These are commonly known as Pin Meters and used to be the most commonly used meters throughout the world. They have two or more pins that are pushed into the wood. Direct current travels out one pin into the moist wood and is picked up by another pin. These meters measure the resistance to a current. Dry wood allows little current to pass, damper wood permits more. The meter reads how much resistance there is to the current and correlates the resistance to wood moisture content.
Electromagnetic Wave Technology (EMW Meters)
Sometimes called pinless meters, these meters measure the moisture content of concrete and wood without piercing the wood with pins. These meters emit electrical waves through a sensor that is pressed against the wood. The waves create an electromagnetic field (EMF) the size of the sensor to a depth up to either .75″ to 1.0″ depending on which model is specified. The field behaves differently depending on how much moisture is in the wood. EMF meters are based on the Capacitance method, but a properly designed meter will take many more factors into consideration. EMF meters measure the capacity of wood to store energy (capacitance), the amount of power the wood absorbs from the field (power loss) or the woods resistance to the field (impedance). The meters translate this electrical information to percent moisture content (%MC).
Tramex has been manufacturing moisture meters for over thirty years. They designed and developed the world's first non-destructive moisture detector working on the principle of impedance measurement using direct contact electrodes.
The Tramex product line offers unique solutions for moisture problems to professionals with their handheld moisture meters and hygrometers.
Tramex offer a number of complete kits to meet individuals requirements please contact us for more information.
This test is done to determine the water content in soil, brick, plaster and many other materials by calcium carbide method. It is a method for rapid determination of water content from the gas pressure developed by the reaction of calcium carbide with the free water of the material tested.
If you are interested in a protimeter product please contact us for more details.