Category: Water Activity Meters

Water Activity Meters

Water activity meters measure the water vapor pressure (Aw) generated by the non-chemically bound water in foods and products and are essential in the quality control of moisture-sensitive materials. Incorrect water vapor pressure levels affect cohesion, storage, pour-ability of powders, tablet stability, and the adherence of coatings.

  • Rotronic HygroLab water activity meter with 7" touch screen

    Laboratory Water Activity Meter HygroLab

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    Laboratory Water Activity Meter - Overview

    The Rotronic HygroLab is an innovative high-end laboratory water activity analyser for measuring up to 4 probes. Simultaneous or asynchronous measurement with the tried-and-tested AW Quick measuring function for pharmaceutical products, tobacco, coffee, food and many more. The Water Activity Meter has a modern 7" Touch screen interface for clear and simple measurement of water activity.  The water activity meter can also be connected to the internet for remote control via a PC or tablet. Measurements can thus be observed and reports downloaded from anywhere at any time.

    Laboratory Water Activity Meter HygroLab - Features

    • Automatically generated measurement report after every measurement
    • 4-channel benchtop display unit for measurement of water activity, relative humidity and temperature
    • AW Quick function for fast measurement results (typically 4-5 minutes)
    • Updates with functional enhancements
    • 4 USB ports (e.g. for mouse and keyboard)
    • Remote access (by PC or tablet)
    • High accuracy of ±0.008 Aw at 23 °C
    • Performs up to 4 measurements simultaneously or asynchronously
    • Quick and easy operation
    • Extended operation with mouse and keyboard possible
    • Measurement of temperature, water activity and relative humidity
    • Customised set-point for fast and simple output of results
    • FDA conformity and the possibility to calibrate probes (coming soon via software update)


  • Handheld Portable Water Activity Meter HP23-AW-A

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    Portable Water Activity Meter HP23-AW-A

    It is very useful to measure water activity in production or storage rooms, e.g. inspection of bulk materials to ensure they meet specifications. The HygroPalm HP23-AW-A offers the perfect solution for on-site water activity measurements to confirm product stability and indicate shelf life, but also suitable as a mobile laboratory unit. Equal to the HygroLab C1 the HP23-AW-A is perfect as a portable analyzer with two probe inputs for any suitable HC2 probe. It can also be used in conjunction with HW4-P-QUICK-Vx for 4-5 min readings.

    This handheld instrument is specially configured to suit the water activity user. The HygroPalm 23-AW-A is ideal for measuring water activity in production processes such as random checks of cheese, meat, tobacco, building materials, animal feeds, bakery products, paper, medicines, horticulture, agriculture, etc.

    Portable Water Activity Meter Features 

    • 2 input channels for HC2 station probes or HC2 insertion probes can be connected for measurement of water activity, relative humidity and temperature
    • AW Water activity Quick function for fast measurement results (typically 4-5 minutes)
    • Audible alarm to indicate completed measurement
    • Saves up to 10'000 data records with %rh, °C, date and time
    • Battery charging function

    Probe ordered separately.

  • Rotronic USB Water Activity Probe

    Water Activity Probe HC2-AW

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    Water Activity Probe Overview

    The station probe HC2-AW-USB offers new possibilities. The USB probe can be directly connected to a PC running HW4-P-QUICK-Vx software enabling water activity measurement capability. The HC2-AW-USB is the perfect device for a multi station application, as multiple probes can be attached to a single PC.

    USB station probes
    USB probes can be ordered as single probe or as a set including the HW4 software with Aw Quick function. The set offers all possibilities to measure water activity.

    Water Activity probe HC2-AW-USB Features

    • Complete set of probe and HW4 including Aw Quick function available
    • Measurement range: 0.00…1.00 Aw (0…100 %RH), -40…85 °C (-40..185 °F)
    • USB interface for direct connection to a PC (HC2-AW-USB)
  • Closed Thermo regulated Water Activity Meter

    AWTherm – Water Activity Meter

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    AWTherm Stabilized Temperature Water Activity Meter

    Stable temperature yields precise measurements.
    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.

    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.

    Water Activity Meter AWTherm Features

    • 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