Model 3440-L 5–5
5. 3440 OPERATIONS
OFFSETS – MOISTURE
Moisture offsets (plus or minus) are sometimes needed when testing
certain materials that contain high amounts of hydrogen-rich compounds,
since the 3440-L measures moisture by determining the amount of
hydrogen present in the material. Some hydrogen-rich materials are
gypsum, coal, lime, fly ash, organic material, mica clays, and phosphates.
If the material contains compounds that are high in hydrogen forms other
than water, an inaccurate reading may result. Offset factors for these
measurements would be a minus
value.
In rare cases, the material to be measured may contain significant amounts
of neutron absorbers such as boron or cadmium. These elements will result
in a moisture reading that is lower than the actual value. In these cases, the
offset factor will be a plus
value.
To enable a moisture offset, press 〈2〉 from the display on page 5–3.
The display will be:
Moisture Offset
DISABLED
Do you want to
ENABLE?
Press 〈YES〉 for the display:
Moisture Offset-
K=x.xx
Do you want a
new M-Offset?
To change the moisture offset, press 〈YES〉 (pressing 〈NO/CE〉 leaves the
factors unchanged.)
The display is:
Select source
of Offset:
1- gauge derived
2- stored value
The operator may then select a previously stored offset value or a gauge-
derived value. The gauge-derived value may be a new value input via the
keypad or an actual value recorded from a measurement.
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