GENEQ > Biotechnologie > Activité de l’eau - Mesure

Appareil de mesure de l'activité de l'eau
modèle LabMASTER-aw

 

A professional laboratory instrument for precision measurements of aw values (water activity) in foodstuff and pharmaceutical products. The temperature of the measurement chamber may be set in the range from 0°C to 50°C and is kept consistently within +/-0.2K.

This instrument offers the most used aw measuring technology throughout the world. The advantages are appreciated by research and foodstuff production companies, as well as an increasing number of manufacturers of drugs and cosmetics.

Features
Measuring range aw 0.03 ... 1.00aw
Measurement chamber temperature
 selectable 0 ... 50°C,
+/- 0.2K
Sensor type
 electrolyte resistive
measurement cell CM-2
Accuracy
 +/- 0.003aw / 0.2°C at 25°C
when the system is calibrated at min. 6 points
Repeatability +/- 0.002aw
Communication RS-232 interface, PC software

High-precision, fast, flexible and easy!

A well-proven laboratory precision instrument for reproducible, precise aw measurements under accurately controlled temperature conditions for all types of foodstuffs, cosmetics as well as dry pharmaceutical materials. The LabMASTER-aw is the only instrument that enables measurements under precisely controlled chamber temperature conditions, selectable in the following range: 0°C to 50°C, with a precision of 0.2K.

The device and its sensor are very robust and have an excellent long-term stability. The Novasina electrolyte sensor delivers essentially hysteresisfree measurements. The implemented user management systems allows a simple and intuitive operation. The system is available in 3 different versions “BASIC” (single user),”STANDARD” (multi user) and “ADVANCED” (multi user and multi cannel). This improves considerably the cost efficiency .

The large, illuminated graphic LC display gives a clear overview. The menue software is simple and intuitive.

For a connection to a printer or a PC, a RS-232 or USB interface is build in the device. A PC-Software for Win9x/2000/NT/XP is included in the instrument delivery. A recorder can be connected to the 0…10 volt analogue output.

Examples of aw measurement samples:
  • All forms of pastry and baked goods
  • Meat and sausages
  • Cheese
  • Fruit concentrates
  • Dried foodstuffs
  • Cosmetics
  • Drugs

LabMASTER-aw instrument:
Surface area:
width 26, depth 44 cm
Weight : 9.8 kg
Mains supply: 90V…260V, 50/60Hz, wide range power supply
Humidity sensor:
Electrolyte measurement cell CM-2
Range :
0.03...1.00aw in the range of 0…50°C.
Repeatability :
+/- 0.002aw
Accuracy :
+/- 0.003aw at 25°C when fully calibrated
Resolution : 0.001aw / 0.1°C
Temperature sensor:
Precise NTC resistor
Range : -20...80°C
Repeatability : +/- 0.1° C
Accuracy : +/- 0.3° C
Resolution : 0.1°C
Humidity standards for calibration:
SAL-T salt tablets:
Saturated pure salt solutions, based on national standards. Novasina recommends the following calibration values:
6%, 11%, 33%, 53%, 75%, 90% and 97% rh