TDL Water Activity Meter


Measure the water activity of any sample with the first water activity sensor completely unaffected by volatiles.Anyone, from a technician in the lab to an operator at theline, can measure water activity in five minutes or less to ± 0.005 a w specifications.

How it Works

Put up to a 7.5 ml sample in a disposable cup, seal the sample chamber lid over the sample, and wait for vapor equilibrium. At equilibrium, the relative humidity of the air in the sample chamber is  equal to the water activity of the sample.

Tunable Diode Laser Sensor

The TDL measures the relative humidity of the air in the sample chamber by emitting a finely-tuned near-infrared laser beam across the headspace. Because water vapor has strong absorption bands  in the near infrared (NIR), the sensor can measure the presence of water vapor in the headspace very precisely.

Unaffected by Volatiles

The beam of the laser, which is less than one nanometer wide, is specific for the commonly occuring isotope of water. Other vapor molecules, including the vapor of different isotopes of water, do not affect the reading.

Read Any Sample

The sensor is powerful enough to measure the water activity of previously impossible to measure samples, including high concentration ethanol, even gasoline.

Speed and Accuracy

Measure water activity in five minutes or less with ±0.005 aw accuracy. The AquaLab TDL is the fastest, most precise water activity meter available for volatiles.

Use (Almost) Anywhere

Water activity is temperature dependent. Internal temperature control lets you set a measuring temperature between 15 and 50 °C and use the instrument anywhere--even outside a climate-controlled facility.

Robust, Easy to Clean

The sensor has no moving parts, and is housed in a fully-sealed sample chamber. The clamshell lid offers easy access to all parts of the sample chamber for cleaning.

Secure Data

AquaLab TDL stores time, date, and user information with every measurement and calibration, and can store up to 8,000 secure data points. Set up to 25 unique users and passwords to control access  to data.

Use available AquaLink software to maintain compliance records and archives, run statistical analysis, and print reports for customers and decision-makers.



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