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2 Installation
The conditions for installation depend heavily on the characteristics of the plant. The optimum
location must be sought for each case individually. The following guidelines will be of assistance.
2.1
Probe installation
The probe must be fitted in such a way that the prongs protrude into the interior of the dryer or
silo. Reliable measurements can only be ensured when the prongs are fully immersed in grain.
Therefore, a location for installation must be chosen where ...
the full length of the prongs is covered by and in contact with grain.
hollow spaces cannot occur in the direct vicinity of the probe prongs (at least 5 cm from the
prongs).
the prongs are in the stream of exhaust (outlet) air. The temperature compensation fails in the
inlet (heated) air zone.
metallic objects, e.g. channelling panels in dryers, are at least 5 cm from the prongs. Meas-
urement anomalies caused by metallic objects can be eliminated by offset-correction (see
page
Fehler! Textmarke nicht definiert.
).
no temperatures above 120°C occur.
In
continuous-flow dryers
, the best place for optimum regulation is at the end of the drying
zone. Regulation can, of course, be further improved by installing additional probes in the drying
zone and at the end of the cooling zone. The final moisture content at the end of the drying proc-
ess can be best monitored when a probe is fitted at the discharge point as well.
grain flow
grain flow
ventilation
roof
Exhaust
roof
measurement fi
eld
m
eas
urem
ent field
TRIME-GR
Figure 4:
A schematic diagram of a roof-dryer (exhaust side !) with a fitted probe. The elliptical area
represents the measuring range of the TRIME
®
-GW probe. The field of measurement dimin-
ishes the greater the distance from the probe.
Nevertheless, the measurement range can extend into the area of the ventilation roofs where
there is no grain. This means that the reading includes a proportion of air in the measurement
volume and thus the resultant relative water content is too low. This constant, location-specific
offset can be compensated for by offset-correction (see section Fehler! Verweisquelle konnte
nicht gefunden werden.).
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13
Summary of Contents for Trime-GW
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