Delmhorst Instrument F-2000 - Manual (Page 12)

Density
The calibration of the moisture testers applies to bales of
normal “average” density. Generally:
hDenser bales may yield readings 1-2% higher.
hLooser bales tend to yield 1-2% lower.
hTests in stacks usually yield readings 2%-3% lower.
hTests on grass hay may yield readings about 3% lower.
Baling should be done according to the lower meter reading.
When testing baled hay, drive the prod across the slices of
the bale, not between them. This will ensure firmer and more
uniform contact.
Use of Preservatives
Hay preservative or stabilizers may also have an affect on
meter readings. Normally a bale of hay treated with preser-
vative will read higher than a bale of the same hay that had
not been treated. The readings typically increase by 2-4%,
and 24-48 hours after treatment, the readings
the bales tend to equalize.
Occasional higher readings may occur if, in addition to the
effect of the increased conductivity due to the stabilizer, the
bales tested also show an increase in temperature and
“sweating.” As the stabilizer becomes more thoroughly
absorbed and the sweating subsides, the meter readings
recede to the initial level and will continue to decrease,
assuming that the bale becomes progressively dryer.
Sample Size
When testing baled hay, it is essential to take readings at
several different points in the bale. Hay moisture may vary a
great deal in the same bale. For example, at one point bale
moisture may be 20% and at another over 35%.
More tests must be made whenever the variations among
readings are greater. If there is a possibility of high moisture
areas, samples from these locations should be taken. Areas of
high moisture content will spoil, resulting in loss.
It is extremely important to note the high readings and the
frequency at which they occur.
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