Laboratory products
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With AwTherm, Rotronic offers a professional, high-end laboratory unit for temperature-stabilised 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. Stabilising the temperature prevents imprecise results due to external temperature infl uences.
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 the device in conjunction with the ROTRONIC HW4 software.
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..0.05 | 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.
For further information on the AwTherm water activity meter and other Rotronic instruments, please visit the website or call +41 44 838 11 44.
ILM Guide 2026/27
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