Description
Water Activity Measuring Cell for Samples up to 25g
The measuring cell (25g) made of aluminium with attachable humidity temperature sensor guarantees very fast adjustment behaviour. Suitable for granules and powders incl spices, Tea and Coffee.
Specifications
| Aw-value measuring range | 0 to 1 aw |
|---|---|
| Resolution | 0,001 |
| Calibration | 0.10 to 0.80 +/- 0.01 aw |
| Calibration | 0.00 to 0.10 and 0.80 to 0.98 +/- 0.04 aw (at 25 °C) |
| Temperature range | 0 to + 50 °C |
| Calibration | +/- 0.5 °C (at 25 °C) |
The measuring device is a laboratory device and allows measurements to be made in accordance with EN ISO 21807.
In the download area you will find the instructions for calibration and adjustment of the water activity meter humimeter RH2.
FAQ:
What is water activity?
Water activity is a measure of the free water available in a substance or product and its ability to promote the growth of microorganisms such as bacteria, yeast, and mould. It is defined as the ratio between the vapor pressure of water in a substance and the vapor pressure of pure water at the same temperature, and is expressed as a dimensionless value between 0 and 1.
Why is the aw-value measuring device important for food?
Water activity is an important factor in food preservation and quality control. Foods with high water activity, such as fresh fruits and vegetables, are more susceptible to spoilage and decomposition because the water in the food provides an ideal environment for microorganisms to grow. In contrast, foods with low water activity, such as dried fruits, have a much longer shelf life because the low water activity makes it difficult for microorganisms to grow.
Is the aw-value measuring device also applicable to meat?
Yes, the humimeter RH2 aw-value meter is used for meat. Fresh meat has the highest water activity. Preservation reduces the availability of moisture for the microorganisms.
What is equilibrium moisture?
Equilibrium moisture is the moisture content that a material or substance absorbs and maintains at a given temperature and relative humidity when it is in a stable state. As the relative humidity rises, the material absorbs moisture until it reaches its equilibrium. When the relative humidity drops, the material releases moisture until it regains its equilibrium.
What is the optimal aw value?
The optimal value depends on the product. Each food has its own limit values that determine when mould formation is possible.
Advantages
- aw value, relative humidity, absolute humidity, dew point, equilibrium humidity
- Fast adjustment behaviour
- Long-term stable humidity and temperature sensors
- Easy data storage on the portable moisture meter
- Optimal documentation of quality
- portable handheld device
- High measurement accuracy
Specifications for RH2 Meter
| Relative humidity | Measuring range according to sensor, resolution 0.1 % R.H. |
|---|---|
| Temperature | Measuring range according to sensor, resolution 0.1 °C |
| Dew point | -55 to +60 °C, -67 to 140 °F |
| Absolute humidity | 0 to 130 g/m³, resolution 0.1 g/m³ |
| Ugl. Equilibrium wood moisture | 2 to 30%, resolution 0.1% |
| Ugl. Plastic granules equilibrium moisture | Resolution 0.01% |
| aw value | 0.0 to 1.0, resolution 0.001 |
| Memory function | Online function, hold function, manual measured value memory |
| Car Data Logger | 10,000 values with measurement location description |
| Dimensions basic unit | 145 x 75 x 30 mm |
| Weight | 210 g (incl. batteries) |
| Power supply | 4 Alkaline AA Batteries 1.5 V |
| Menu languages | German, English, Italian, French, Spanish, Portuguese, Czech, Polish, Russian, International |
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