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Tursdale Technical Services Ltd
Unit N12B
Tursdale Business Park
Co. Durham
DH6 5PG
United Kingdom
Phone: +44 ( 0 ) 191 377 3398
Fax: +44 ( 0 ) 191 377 3357
info@tursdaletechnicalservices.co.uk
http://www.industrial-needs.com/
Manual
Humidity detector for building materials
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1. Characteristics ............................................................................................................................................. 3
1.1 Unit density ................................................................................................................................................. 3
1.2 Moisture content ........................................................................................................................................ 3
1.3 CEN (European Committee for Standardization) .................................................................................... 3
1.4 In Practice ................................................................................................................................................... 4
2. Electric moisture measurement ................................................................................................................. 4
2.1 Outline ......................................................................................................................................................... 4
2.1.1 Wood species, building materials and paper ................................................................................... 4
2.1.2 Temperature ........................................................................................................................................ 4
2.1.3 Accuracy .............................................................................................................................................. 5
2.1.4 Measuring depth ................................................................................................................................. 5
2.1.5 Measuring methods ............................................................................................................................ 5
2.1.6 Measuring direction ............................................................................................................................ 5
2.1.7 Measuring surface .............................................................................................................................. 5
2.1.8 Measuring range ................................................................................................................................. 6
2.1.9 Preservatives ....................................................................................................................................... 6
3. Wood species ............................................................................................................................................... 6
4. Building materials ...................................................................................................................................... 17
5. Paper ........................................................................................................................................................... 18
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1. Characteristics
In this chapter the unit density, the oven-dry method and the moisture measurement with the Micro-Electronics
moisture meters are described.
1.1 Unit density
The formula for the unit density is:
The unit density is used for moisture measurements with the FMW-B / FMW-T moisture meters.
• For wood, the FMW-B / FMW-T are set at the average unit density applicable for a moisture
content of 0%.
• For building materials and paper, the FMW-B / FMW-T is set at the reference line.
1.2 Moisture content
The average moisture content of a sample is determined using the oven-dry method.
• For wood, a sample of approx. 100-200 gram is weighed and then dried at 102-105 °C, until
the mass of the sample is constant.
• For building materials and paper, we refer to the manual for the relevant measuring
equipment.
The formula for determining the moisture content according to the oven-dry method is:
The Micro-Electronics moisture meters calculate the actual moisture content, as determined by the
oven-dry method.
1.3 CEN (European Committee for Standardization)
EN 13183-1 Round and sawn timber Method of measuring moisture content Part 1: Method for
Produktspecifikationer
| Varumärke: | Brookhuis |
| Kategori: | Mätutrustning |
| Modell: | FMD |
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