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 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:
Press 〈YES〉 for the display:
To change the moisture offset, press 〈YES〉 (pressing 〈NO/CE〉 leaves the
factors unchanged.)
The display is:
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.
of Offset:
1-
gauge derived
2-
stored value
DISABLED
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