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Stable temperature yields precise measurements.
Credits: Action Instruments | July 2016

Stabilized Temperature measurement

Rotronic launched its newest solution for measuring water activity. The AwTherm is a professional, high-end laboratory unit for measuring water activity at a stabilized temperature. Water-activity measurement reacts very sensitively to variances in temperature. Stabilizing the temperature prevents imprecise results due to external temperature influences. The wide control range permits measurements to be integrated directly in the manufacturing of food, paper, pharmaceutical and chemical industries.

Why measure water activity?
Water activity quantifies the active part of the moisture content or ‘free water’ as opposed to the total moisture content which also includes bound water. In products it influences its microbiological, chemical and enzymatic stability. If there is too much free water present, the products spoil and too little water can be detrimental to the product characteristics.

By measuring water activity in food it is possible to determine which micro-organisms will not be able to develop on them.

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

Water activity also provides useful information about characteristics such as cohesion, storage lifetime, clotting or pour ability of powders, tablets, etc., or the adhesive properties of coatings.

AwTherm Features

•Highest precision through stabilization of temperature ± 0.01 °C/min
•Wide temperature-control range. 0 - 60 °C
•Excellent reproducibility
•Long-term stability

•Variable size sample container
•Reference probe exchangeable for calibration or cleaning
•Quickest measurements with the AwQuick function, typically about 5 minutes
•Simple operation via Touch Interface
•Conforms to ISO 21807 / EMC 2008/108/EC / IEC EN 61010-1:2010

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.


The AwTherm shows its paces in island-operation mode, with its simple handling and clarity. No laboratory should be without this device.

Contact Action Instruments:
Tel: 011 403 2247
20 De Korte Str.|Braamforntein|Johannesburg


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