Excellent User Friendliness
Features a color touch panel that provides intuitive controls.
Allows for wide-ranging measurements between Aw 0.10 to 0.98 to be performed in just 10 minutes, a reduction in time of 30% compared to previous models.
Allows for accurate measurements regardless of whether the sample is a solid, liquid, or powder.
 
 
Maintainability
Features sensors that can be exchanged and calibrated by the customer. Maintenance can be performed without the use of tools. Specialized repairs are not required when the sensors become degraded. Reagents can be reused, allowing for cost reductions when performing periodic tests.
 
 
Durability
Features accurate Aw-measuring sensors with low-susceptibility to the effects of alcohol.
Using the optional sensor protection filter will reduce sensor degradation due to acids etc., ensuring that they can continue to be used for a long period of time.
 
 
Compatible with USB
More than 100 pieces of data can be stored on the meter. It can also export records to USB memory drives (in CSV format).
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Specifications for the Water Activity Meter

Model: EZ-200

• Sensor: Electric resistance type

• Measurement Range: 0.10～0.98 Aw

• Measurement Accuracy: ±0.01 Aw (at 25℃±0.3℃)

• Measurement Time: On average 10 minutes per sample

• Calibration: 4 points (0.33, 0.53, 0.75, 0.93 Aw) at 25℃

• AC Adapter:

• Input: 100-240V, 50-60Hz

• Output: DC 24V

• Main Unit Rating: DC 24V, 0.65A

• Dimensions: 165(W) × 130(H) × 270(D) mm

• Weight: 4.3 Kg

 
 
Accessories: Power adapter, sample containers (5), reagent of saturated salt solution for calibration(4 types)*3, silica gel*4, grease, dispensing spoon, pipette
 
*1: When the third decimal point is "rounded."
*2: When the sensor protection filter is not attached
*3, *4: With matching container

If any reagent of saturated salt solution for calibration finished up, purchase the guaranteed Reagent.
 
Optional accessories
Sample container 10 units
Sensor protection filter 10 sheets
Inlet air filter 2 units
Replacement packing 2 units
Grease 50 g
Replacement sensor board 1 set (with packing, grease and saturated salt solution for calibration)
 
 
 
What is Water Activity (Aw)?
Water activity is a comparison between the surface moisture vapor pressure of a food item (P) and the vapor pressure (P0) of pure water (water activity AW = P/P0: value 0 to 1). This is the same value as if the food item was placed in a sealed container the equilibrium relative humidity percentage of the inside of the container (which equals Aw x 100) was divided by 100. In addition to the water content (percentage of water content) as the physical property value of the food item, water activity is used in fields such as product design, quality control, and HACCP.
The water contained in food items does not always exist as pure water, some of it is a salt or sugar solution, or a protein hydrate. Water activity reflects the state of highly mobile free water within the food item, allowing for the existence of microorganism growth to be confirmed. It also provides clarity regarding the relationship between the state of free water and the speed of microorganism growth.
 
Lowest levels of water activity required for microorganism growth
Mold： 0.80(0.65)
Yeast： 0.88(0.65)
Bacteria： 0.91(0.75)
*The values within brackets are for halophilic, glucose tolerant, and xerophilic varieties.
Water activity tends to increase as water content rises, but it is not a uniform correlation. This product uses electric resistance sensors that are based on official methods provided by the Ministry of Health, Labour and Welfare.
 
Contained water
 
Free water
 
For example, jam has a high moisture content but the water activity is not so high because most the moisture is combined with the sugar. On the other hand, white bread does not use a lot of sugar or salt so the value of water activity increases considerably to around 0.96.