IMKO Trime-GW, Operating Instructions Manual

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2. This TRIME
®
-GW must be set as described in section 3 to 3.2.7. Simultaneously, the measure-
ment data for all the other instruments must be gathered, too (section 3.2.5). The samples for this
should be extracted from as near to the probe as possible.
3. Using the differences between the readings of each of the instruments, the TRIME
®
-GW can be
adjusted using the offset-correction connector as set out in section Fehler! Verweisquelle konnte
nicht gefunden werden. .
3.2.2 The product selector-switch
The TRIME
®
-GW is ideally suitable for relative measurements. It can measure differences in moisture
up to the nearest 0.1%. The product selector-switch must be correctly adjusted to be able to take ab-
solute measurements. A selection can be made from 15 different levels (1 to F). Level 0 is reserved
for diagnosis purposes. The individual levels differ from each other by 1% with 20°C and standard
calibration for corn and cereal.

In Level 1, the highest measurement appears, suitable for the lowest possible bulk density.

Level F provides the lowest measurement, corresponding to the highest possible density.
The appropriate level on the product selector-switch must be selected depending on the grain to be
measured and its bulk density specific to the plant.
3.2.3 Selection and application of the reference method
In order to adjust the TRIME
®
-GW on-line, an off-line method of measurement must be available to
serve as a reference. It must provide a high degree of absolute precision and function with large sam-
ple volumes
Most commercially available grain-moisture measuring systems leave a great deal to be de-
sired regarding both of these aspects!
The TRIME
®
-GW measures the average value continuously over a volume of 1-2 litres. In moving
grain, the measurement volume acquired in the averaging time increases many times over. It there-
fore requires a lot of time and effort to check this very representative value with a reference instrument
that shows a sample quantity in the millilitre range. There are also factors that can affect measure-
ment, such as temperature and conductivity, that can be ignored when using TRIME
®
-GW because of
the TDR method of measurement.
Thus, the most suitable method for determining the exact moisture of the grain is to use a drying oven.
Here, too, the sample volume is of decisive importance and should be at 0.5 litres.
When extracting the sample and taking reference measurements, the following must be observed:

The samples for the reference measurements should be extracted from as close as possible
to the probe. The distribution of moisture in the grain dryer can vary greatly.

When using a calibrated instrument with small sample volumes, several samples must be ex-
tracted and their arithmetical average calculated.

Please note that calibrated instruments can also produce incorrect measurements that can lie
between 2% in the lower and even 5% in the upper moisture range.
3.2.4 Initial operation
Once the TRIME
®
-GW has been turned on and after a few seconds, “EE.E“ or 166% (dependent on
the display type) should appear on the display as long as the dryer is empty or the probe prongs are
not completely immersed in grain. The current output of the TRIME
®
-GW signalises this with a current
of 33.2 mA (or 30.56 mA at 4..20 mA).
After the dryer or the silo has been filled, the display must show a valid reading. The output current of
the TRIME
®
-GW is between 0 and 20 mA.
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