Water activity meter
Quality Control InstrumentsWater activity instruments
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
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ROTRONIC
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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 supply / 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
Weight 4200 g -
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