Novasina water activity meter portable#
Novasina water activity meter Offline#

Either bench-top or portable instruments may be used but often a sample temperature-controlled meter will be required where high aw values are expected for micro-growth related applications.

Novasina water activity meter Offline#

Water activity is usually measured as an offline sample measurement in the laboratory or the production area. Some laboratories offer accredited testing for aw. Water activity can be used for microbiological growth control, shelf-life, the stability of product composition (moisture migration), general product quality (texture, taste, potency & colour). The aw of a product may be critical to ensure microbial stability and safety, it may even be a legal parameter, often measured as part of Critical Control Point (CCP) validation, monitoring or verification. Whilst this can re-equilibrate over time, it may take several hours to do so and an erroneous reading may have been taken in the meantime. Typically, a sudden change in the ambient temperature of 2 ☌ can result in several ERH% shifts in the reading of a previously stabilised sample. The higher the aW value, the greater the influence of temperature on the stability of water activity. Water activity (aW) scaled 0 – 1 aW (Most microbiologists tend to use aW units).Īir relative humidity is influenced by temperature so it follows that equilibrium relative humidity (water activity ) will be too. Water Activity can be expressed as either:Įquilibrium relative humidity (ERH) scaled 0% – 100% ERH The water activity of the sample is equal to the relative humidity of the air surrounding the sample in a sealed measurement chamber. This “Available Water” is the unbound water able to come and go from material by adsorption/desorption.

Water activity is the measurement of the equilibrium relative humidity (ERH) of a material, that is the humidity that a hygroscopic material generates when it comes into balance with the air surrounding it in a sealed headspace.

Wireless Environmental Monitoring System.

Lux, UV, Humidity & Temperature Data Logger | ELSEC 765C.

Humidity & Temperature Transmitter | nLink Analog (Novasina).

Humidity & Dewpoint Measurement Transmitter | QuantaDat (Novasina).

Precision Humidity and Dewpoint Instruments.

Differential Pressure Instrument | Pascal ST Membrane (Novasina).

Differential Pressure Gauge | Pascal Maxx.

Differential Pressure Gauges & Instruments.

Water Activity Meter | LabSwift AW (Novasina).

Water Activity Meter | LabTouch AW (Novasina).

Water Activity Meter | Labmaster Neo AW (Novasina).