Delmhorst Instrument RDM-3P - Manual (Page 2)

The meter tends to read the highest moisture content that is in contact with both pins. If
thick samples are not well equalized, it may be necessary to make tests at different
depths to determine the degree of uniformity of moisture distribution in the sample.
If the meter is used on stock so thin that the full length of the pins is not entirely
embedded in the thickness of the sample, the readings tend to indicate a lower than
actual MC. This can be overcome by testing more than one sample in stacks.
USING THE 0 –100 RELATIVE SCALE
This scale is used to test the moisture content of hygroscopic materials for which a
calibration is not available. Depending on the material, a special application external
electrode, instead of the integral contact pins may be required. Increasing readings on
the 0-100 reference scale indicate higher levels of moisture content. These readings can
be translated into percent moisture content once a calibration has been developed.
¾ Set the meter scale to REL 0-100. If necessary, attach an external electrode to the
meter.
¾ Push the contact pins into the material or apply the external electrode.
¾ Take readings as described above.
The readings may also be used for comparative tests, after meter readings have been
related to given conditions for the materials involved. When the meter is used as a
gauge for comparative tests, readings should be taken on samples considered to be at
“safe’ levels or in satisfactory condition. These readings are then used as the “standard”
against which subsequent readings on the same material are evaluated.
The “standard” for any given material is related to safe storability or any other property
which is important for further production processing.
TESTING BALED SCRAP PAPER
¾ Set the meter scale to BALED PAPER. Attach an external electrode to the meter.
¾ Push the external electrode into the material being tested.
¾ Take readings as described above.