H68.0.02.6C-04
Operating Manual GMK 210
page 7 of 20
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5.3 Holding the device
The water content of the hand has an impact on the measuring value, if the device is
held inappropriately.
The best results will be obtained if you lay the device down or hold it the way as
shown in picture 3.
Picture 1: Held in a wrong way!
Picture 2: laid down
– right!
Picture 3: Held in the right way!
5.4 Moisture
u
and water content
w
Either moisture u or water content w is needed according to the application.
Carpenter, joiner, etc. normally use moisture u (relating to oven-dry mass)
Water content w is normally used for combustibles (i.e. wood briquette).
You can choose whether the device should use moisture or water content (see chapter 11).
Moisture u (relating to oven-dry mass) - recommended setting
The unit is %u (also common: % atro, weight percent).
mass
wet
:
mass of the sample (= total mass = mass
water
+ mass
dry
)
mass
water
: mass of the water contained in the sample
mass
dry
:
mass of the oven-dried sample after (water has been evaporated)
Example: 1kg wet wood that contains 500g water has a moisture u of 100%.
Water content w (= moisture relating to wet total mass)
The unit is %w
Example: 1kg wet wood that contains 500g water has a water content of 50%.
ATTENTION:
moisture u[%] = ( (mass
wet
- mass
dry
) / mass
dry
) *100
or:
moisture u[%] = (mass
water
/ mass
dry
) *100
water content [%] = ( (mass
wet
- mass
dry
) / mass
wet
) *100
or:
water content [%] = (mass
water
/ mass
wet
) *100
