Protimeter Grainmaster i - Using the Moisture and Temperature Probe GRN3005

Protimeter Grainmaster Page 5
3.1 Using the Optional Moisture and Temperature Probe No. GRN3005
Nine calibrations for the external Moisture and Temperature probe are pre-programmed
into the Grainmaster i as shown Table 2 below:
Note: The optional probe can be used with the Grainmaster i for checking the moisture
and temperature levels of stored grain. This probe is used to monitor the condition of
stored grain quickly; it is not a substitute for moisture measurements taken from
ground samples as detailed in section 2.0. Ground sample measurements are more
reliable than moisture probe measurements.
Note: Be sure that the instrument’s internal grain cell should be empty while using the
external moisture probe. Avoid contact with the centre pad of the cell while using the
grainprobe.
Use the optional external moisture and temperature probe as follows:
1. Remove the protective cap from the tip of the Moisture and Temperature Probe.
2. Push the probe into the grain and, initially, allow a few minutes for temperature to
stabilize. Connect the probe to the instrument as described above.
3. Press and release to switch ON, confirm that the instrument senses external
moisture probe flagged by display showing ‘PROBE’ – if not, press  once to do so.
4. As with the internal grain cell, if the crop shown is not the required one, then press 
or
 to select it; note that some crops are not available with the external moisture
probe.
5. Press and hold to display either the temperature or moisture level. Release and
press
 or  to switch from moisture to temperature displays as required.  will toggle
back to the internal grain cell.
Note: The user adjustments may be made in the same manner as for the internal grain cell,
these are stored separately from the later.
The spiral wound electrodes (that make the moisture measurement) should be wiped clean
with a cloth at regular intervals to prevent the accumulation of dust that may attract
moisture and give an erroneous reading. A temperature sensor is mounted in the tip of the
probe. This is easily damaged if the probe tip is rammed against hard surfaces. Always
replace the protective cap when the Moisture and Temperature Probe is not in use.
Table 2: Optional Moisture and Temperature Probe Calibrations
Wheat Canola Oats
OSR (oilseed rape) Beans Barley
Linseed Peas 0-100 relative