Delmhorst Instrument FX-2000 - Manual (Page 11)

9
Range of Moisture Content
The FX-2000 is designed to test moisture in hay over a range
of 6%-40%. Readings over 30% should be used only as a
qualitative indication of high moisture content. Delmhorst
moisture meters use the relationship existing between electrical
conductivity and moisture content in hay. As moisture content
increases, so does the conductivity.
Tests on hay at high moisture content, over 25%, are less
accurate. This is mostly due to the variability in moisture
distribution. The reduced level of accuracy in the high range
does not significantly affect the usefulness of the meter, as a
few high readings indicate that some action be taken to dry
the hay to avoid spoilage or even self-combustion.
While it is important to note the average of several readings,
it is even more important to note the high readings and the
frequency at which they occur.
Hay Temperature
The FX-2000 has been calibrated at 80°F on various samples
of different types of hay, mostly alfalfa, and on different
cuttings and mixtures. The higher the temperature of the
sample, the higher the meter readings will be. Temperatures
lower than 80°F cause lower meter readings. The correction
is approximately 1% point for every 20° difference. Refer to
chart below:
Hay temperature Add to reading Subtract from reading
20°F/-7°C 3 --
40°F/ 5°C 2 --
60°F/15°C 1 --
80°F/30°C 0 0
100°F/40°C -- 1
120°F/50°C -- 2
140°F/60°C -- 3
Example
Meter reading: 22%
Temperature: 40°F/5°C
Moisture Content: 24% (22 + 2)