AwTherm - Water Activity Meter
Stable temperature yields precise measurements.
Temperature-stabilized measurement
With AwTherm, ROTRONIC offers 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.
User-friendliness
The AwTherm shows its paces in island-operation mode, with its simple handling and clarity. No laboratory should be without the device in conjunction with the ROTRONIC HW4 software
Why measure water activity?
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 |
Measuring water activity provides useful information about characteristics such as cohesion, storage lifetime, clotting or pourability of powders, tablets, etc., or the adhesive properties of coatings.
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
ROTRONIC provides a high-end laboratory device, the HygroLab C1, for water activity measurements from as many as four separate probes. Use multiple stationary probes and insertion probes for measuring water activity in cheese, meat, tobacco, building materials, animal feed, pharmaceuticals products and much more.
| Device type | Temperature-stabilized water-activity measurement |
|---|---|
| Sample sizes | Variable (14 mm / 40 mm) |
| Sample container dimensions | AwT-PS14: Ø46 x 14 mm AwT-PS40: Ø46 x 40 mm |
| Operating range | 1...40 °C (34...107 °F) |
| Accuracy | ±0,005 aw (10...30 °C) ±0,1 °C (±0,18 °F) |
| 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) |
| Chamber-temperature gradient | <0,1 °C (<0,18 °F) |
| Power consumption | 110...230 V / 50...60 Hz ≤2 A |
| Long-term stability | <0.01 aw/year |
| Humidity sensor | Hygromer IN-1 |
| Temperature sensor | PT100 1/3 DIN Class B |
| Calibration / adjustment | Aw & Temperature: HG2-S (probe removed with AwT-CAL) Aw: ROTRONIC humidity standards (via HW4) |
| Display type | 8-line LCD with touch operation |
| HW4 compatible | Yes (v 3.6.0 and higher) |
| Trend indicator | Yes |
| Aw-quick mode | Yes |
| Firmware update | Via USB port |
| Communication interfaces | Micro USB |
| Housing | PC / ABS |
| IP protection rating | IP21 |
| Standards | ISO 21807 |
| CE / EMC conform | EMC 2004/108/EC IEC EN 61010-1:2010 |
| Maintenance | Annual calibration (recommended) |
| Dimensions | 400 x 180 x 180 mm |
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