Laboratory MR101.2 moisture meter
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The MR101.2 moisture meter is designed for the rapid analysis of water content in powders and granules, and provides measurements that are insensitive to sample preparation, including variations in bulk density. Samples are simply poured into an appropriate measurement cup (supplied) which is then positioned on the meter, and the moisture content indicated on the digital display. Pre-set calibrations for different materials can be entered into the computer memory, making this a versatile device for a range of materials. The MR101.2 moisture meter is suitable for the measurement of a variety of materials, including sugar, sand, chemicals, pharmaceuticals, and other materials with low to super low moisture content.
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General Specifications
- Range of moisture measurement: typically within 0.01 to 16% (and depends on the type of material being tested)
- Resolution, in % moisture: 0.001%
- Accuracy depends on material under test, and generally increases with decreasing water content and calibration range (see Table 2 overleaf)
- Memory for up to 10 calibrations*, for different types of materials
- Measured water content is independent of bulk density, particle size/shape.
- Sample volume : 40 to 50 cm3
- Wipe clean surfaces
- Reliable and robust
- Stable calibration
- Dust and water protected
- Frost-resistant indicators
- RS-485 interface for data logging to computer
How the meter works
The meter is based on an open-ended resonator, in which the coupling of electromagnetic energy between the test material and the meter is via the fringing fields from the open resonator to the sample cup. These fields act as an ‘effective' capacitance and conductance, and determine the values of f and Q for the resonator, which in turn can be related to the moisture content of the material under test, via predetermined calibration constants. These calibration constants are remarkably stable, and are much less dependent on sample preparation than alternative measurement technologies, based on the direct measurement of resistance/conductance or capacitance.
| Parameter |
. |
| Weight of meter (kg) |
No more than three |
| Dimensions of meter (approx., cm) |
35 (h) x 22 (w) x 12 (depth) |
| Volume of sample cup (cm3) |
50 |
| Dimensions of sample cup (cm) |
D4 |
| Power supply (V) |
190/240 |
| Power consumption, max (W) |
40 |
| Display refresh rate, min (seconds) |
1 |
| Analogue output (mA) |
4-20 |
| Serial port standard |
RS-485 |
| Operation temperature range (° C) |
+5 to + 45 |
| Operation ambient humidity (%RH) |
40 to 98 |
Table 2 Typical measurement ranges and associated accuracy for different materials, as measured by the MR 101.2 moisture meter. Accuracy is given as standard deviations (n = 10) of the difference between the moisture meter reading and that of the standard laboratory method (e.g. loss on drying or Karl Fisher titration).
| Products |
moisture range in
% |
Accuracy (Std.- deviation) in % |
| Tobacco |
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| cut-tobacco |
10 - 15 |
+/- 0.2 |
| cigarettes |
10 - 15 |
+/- 0.2 |
| cigars |
10 - 20 |
+/- 0.2 |
| Coffee |
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| green beans |
8 -15 |
+/- 0.2 |
| roasted beans |
3 - 6 |
+/- 0.15 |
| grinded coffee |
3 - 6 |
+/- 0.15 |
| instant coffee |
2 - 5 |
+/- 0.15 |
| Cocoa |
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| powder |
1 - 14 |
+/- 0.15 |
| Sugar |
0.01 - 0.05 |
+/- 0.005 |
| 0.05 - 0.1 |
+/- 0.01 |
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| 0.1 - 1 |
+/- 0.02 |
|
| 1 - 3 |
+/- 0.1 |
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| Tea |
2 - 12 |
+/- 0.2 |
| Milk powder |
1.5 - 7 |
+/- 0.15 |
| Casein, Caseinat |
3 - 12 |
+/- 0.2 |
| Salts |
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| carbonates |
0.01 - 0.5 |
+/- 0.01 |
| sulfate |
0.01 - 0.5 |
+/- 0.01 |
| Nitrate |
0.01 - 0.5 |
+/- 0.01 |
| Silicic acid |
2 - 5 |
+/- 0.05 |
| Alumina |
0 - 3 |
+/- 0.1 |
| Zeolit |
0.3 - 1.5 |
+/- 0.03 |