Benchtop AW-meter
A professional, high-end laboratory unit for temperature-stabilized measurement of water activity in the foodstuffs, cosmetics, or pharmaceutical industries.
The wide control range permits measurements to be integrated directly in the tempered manufacturing or storage process. Water-activity measurement reacts very sensitively to variances in temperature. Stabilizing the temperature prevents imprecise results due to external temperature influences.
Exchangeable measuring head
A further advantage of AwTherm is that the measuring head is removable, which means that the probe can be temperature-calibrated or adjusted to give high precision.
Features
- ROTRONIC HYGROMER® IN-1
- Highest precision through exact stabilization of temperature
- Wide temperature-control range
- Excellent reproducibility
- Excellent long-term stability
- Variable size of sample container
- Reference probe exchangeable for calibration or cleaning
- Quickest measurements with the AwQuick function
- Simple operation via Touch Interface
- Conforms to ISO 21807 / EMC 2008/108/EC / IEC EN 61010-1:2010
Specifications
| Accuracy | ±0,005 aw (10…30 °C) / ±0,1 °C (±0,18 °F) |
|---|---|
| Chamber-temperature gradient | <0,1 °C (<0,18 °F) |
| Operating range | 1…40 °C (34…107 °F) |
| Sample container dimensions | AwT-PS14: Ø46 x 14 mm / AwT-PS40: Ø46 x 40 mm |
| Sample sizes | Variable (14 mm / 40 mm) |
| Device type | Temperature-stabilized water-activity measurement |
| Measuring range | 0.005…1.000 aw |
| Temperature-control range | 0…60 °C (32…140 °F) |
| Temperature stability | ±0,01 °C/min (±0,018 °F/min) |
| Calibration / adjustment | Aw & Temperature: HG2-S (probe removed with AwT-CAL) Aw: ROTRONIC humidity standards (via HW4) |
| Dimensions | 400 x 180 x 180 mm |
Why measure
wateractivity?
The free water in a product influences its microbiological, chemical and enzymatic stability. If there is too much free water present, the products spoil; too little water can be detrimental to the product characteristics.
| Water activity | Contaminants |
| aw = 0.91..0.95 | Many bacteria |
| aw = 0.88 | Many yeasts |
| aw = 0.80 | Many mildews |
| aw = 0.75 | Halophile bacteria |
| aw = 0.70 | Osmiophile yeasts |
| aw = 0.65 | Xerophile mildew |