humimeter RH2
water activity meter / analyzer

Precision portable measuring device for the determination of the aw-value

humimeter RH2  
water activity meter 

Portable laboratory instrument for determination of water activity (aw value) of food with datalog function.

Suitable for measuring materials like butter, fruit mix, spices, granulate, mushrooms, xylit, flour, biscuits or sausage as well as all other food types requiring a check of the water activity value.

Furthermore, the humimeter RH2 is suited for measuring special material, e.g. plastic granulate or for climatic and environmental applications.

Not suited for juices (syrup), acidic food like vinegar or food and beverages containing alcohol. 

Features

  • Measuring range 0.03 to 0.98 activity of water
  • Resolution 0.001 aw
  • Calibration 0.10 to 0.80 +/- 0.01 activity of water
  • Calibration 0.00 to 0.10 and 0.80 to 0.98 +/- 0.04 aw (at 25°C)
  • Temperature range 0 to + 50°C, calibration +/- 0.5°C (at 25°C)
  • Measuring range of relative humidity 0 to 100% rh, resolution: 0.1% rh
  • Temperature can be set to °C or °F as required
  • Dew point -55°C to + 60°C, resolution 0.1°C, -67°F to 140°F
  • Absolute humidity 0 to 130 g/m³, resolution 0.1 g/m³
  • Equilibrium moisture content 2% to 30%, resolution 0.1%
  • Equilibrium moisture content synthetic granules resolution 0.01 %
  • User programmable characteristic curves for calculation of equilibrium moisture content
  • Online-function, Hold function, manual data memory
  • Automatic datalog for up to 10,000 logs with measuring point report
  • Supplier-Management
  • Menu languages: English, German, Italian, French, Spanish, Russian and many others on request
  • scope of supply: humimeter RH2 with rubber protection cover and batteries
  • Optional: humimeter USB data interface module with LogMemorizer measuring data recording and analyzing software on USB flash drive incl. USB cable for PC and printer

Your benefits

  • Relative humidity, absolute humidity, dew point, equilibrium moisture content, aw-value
  • Long stable humidity sensor
  • Easy data storage at the portable moisture meter
  • Analysis on the PC and printer available
  • Optimal documentation of your quality

article no. 12005 humimeter RH2 measuring device for air humidity
article no. 13700 Activity of water measuring chamber incl. moisture and temperature sensor with 2 meter connection cable

Extended accessories

Art. No.PictureExtended accessories
13741Schraubglas 282ml Aw-Wert Messkammer

Jar replacement set with twist-off lid
for a filling quantity of max. 186 ml

13740Schraubglas 330ml Aw-Wert MesskammerJar replacement set with twist-off lid
for a filling quantity of max. 245 ml

12278humimeter USB data interface module with LogMemorizer measuring data recording and analysing software on CD incl. USB cable for PC humimeter RH2 measuring device for air humidityhumimeter USB data interface module with LogMemorizer measuring data
recording and analysing software on USB flash drive incl. USB cable for PC
12485 humimeter USB humimeter USB data interface module VERSION FOR RECHARGEABLE BATTERIES with LogMemorizer measuring data recording and analysing software on CD incl. USB cable humimeter RH2 measuring device for air humidityhumimeter USB humimeter USB data interface module VERSION FOR RECHARGEABLE
BATTERIES with LogMemorizer measuring data recording and analysing
software on USB flash drive incl. USB cable
13340Internal Bluetooth class 1, integrated module class 1 (up to 100 metres) for humimeter devices. Combinable with USB interface.
11368Pt1000 Universal handheld temperature sensor for humimeter RH2
11988Wall mount assembled on humimeter RH2 measuring device for air humidityWall holder assembled on humimeter RH2
11733Thermo printer runs by battery, industrial model, portable humimeter RH2 measuring device for air humidityThermo printer runs by battery, industrial model, portable
10006Kalibriervorrichtung für Rohrfühler für humimeter RH2 Messgerät für LuftfeuchteCalibration equipment for tube sensor
10005Certified calibration ampules - set of 5. 2 x 35% r.h., 1 x 50% r.h., 2 x 80% r.h. humimeter RH2 measuring device for air humidityCertified calibration ampules - set of 5.
2 x 35% r.h., 1 x 50% r.h., 2 x 80% r.h.
10352Certified calibration ampules - set of 5, 50% r.h. humimeter RH2 measuring device for air humidityCertified calibration ampules - set of 5, 50% r.h.
12627Bluetooth data communication module for all humimeter devices with serial interface RS232 humimeter RH2 measuring device for air humidityBluetooth module pluggable, class 1 (up to 100 metres) module for humimeter devices with USB interface and appropriate software 
13624Plastic case for humimeter RH2

Water activity of food / handling of device

The water activity of products, especially of food, indicates the amount of unbound water in a material. This quality factor, also called aw value, depends on the water vapour pressure in the material, on the current temperature and on the water vapour pressure of the surroundings.

The humimeter RH2 water activity meter enables the quick and easy determination of the water activity. Furthermore, due to the large sample volume of the water activity measuring chamber, higher quantities can be measured within a short time, enables a higher number of taken random samples.

The simple handling guarantees a cost-saving and faultless process of measuring the activity of water value of food. Just fill the material into the activity of water measuring chamber and close it.

After an appropriate conditioning time (time period until a constant climate in the chamber is reached = moisture equilibrium) the water activity can be directly read off the display of  the humimeter RH2 water activity meter.

The time period until reaching the moisture equilibrium strongly depends on the material to be measured as well as on the temperature. Hygroscopic materials like cornflakes assimilate in a considerably shorter time than whole maize grains. In this context it is important that the samples have the sample temperature than the measuring instrument resp. the measuring chamber – high temperature differences lead to a longer conditioning time.

This conditioning time depending on the material is a physical phenomenon and cannot be shortened artificially.

Generally, the conditioning time ranges from 5 minutes to about an hour.

The moisture equilibrium is achieved when the displayed measuring value is no longer changing for a period of several minutes (e.g. 10 minutes, changes less than 0.002 aw).

Request and consultation

humimeter RH2
with activity of water measuring chamber

Interested in this product? Our specialists will be happy to give comprehensive and free advice on product features and technical solutions. Send your inquiry or just call us on

+43 3178 28899

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