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

The level of accuracy of meter readings depends on a number of factors: similarity
between the material tested and samples on which the calibration was made; moisture
distribution; and chemical application or processing which may affect the electrical
properties of the paper product.
The required electrode is the H-4 with a #830-series prod. (10”or 18”). A sharp, steel rod
to open the hole for the prod may be helpful if the bale is very dense.
A few meter readings in a limited number of specific areas of a large mass can hardly be
projected to indicate an average moisture content of an entire bale. The readings can be
very helpful in providing an indication of the overall moisture condition inside the bale
and to detect areas of excessive moisture.
Meter readings may be used as an arbitrary guideline in determining whether or not to
accept or reject the material. Since checking the moisture condition of bales is
performed when buying and selling, the specific value of the meter readings remains an
element to be agreed upon between buyer and seller. Such an agreement should
consider not only a specific “range” of readings, but the number and location of where
they are taken.
The following ranges can be used as a guideline and may help to interpret the readings:
• Readings of 8%-12%, with EMC to 60% RH are usually considered “dry”.
• Readings from 12%-20% with EMC to 95% are usually considered “acceptable” but
should be taken with some reservation.
• Readings of 20%-40% are considered “wet” and unacceptable.
Delmhorst Instrument Co. [email protected]
Towaco, NJ USA 07082 Tel - 973-334-2557
Fax – 973-334-2657
Rev 10/10