Description
All the features of the Series 4TE plus a volatiles sensor for measuring samples containing propylene glycol, ethanol and other volatiles.
Easy Switching
The 4TEV comes with both a volatiles capacitance sensor and the standard Series 4 dewpoint sensor. You can switch between sensors using the 4TEV instrument menu.
How It Works
Put a 7.5 ml product sample in a disposable cup, seal the sample chamber lid over the sample, and wait for vapor equilibrium.
For non-volatile samples, an infrared beam focused on a tiny mirror determines the precise dewpoint temperature of the sample. That dewpoint temperature is then translated into water activity.
For samples containing volatiles, a hygroscopic polymer sensor detects the equilibrium relative humidity of air in the headspace above the sample. This method is slightly less accurate than the dewpoint method (±0.015).
Features
- Fast - water activity readings in 5 minutes or less
- Switch easily between volatiles and non-volatiles sensors
- Volatiles sensor accuracy: ± 0.015 aw
- Non-volatiles sensor accuracy: ±0.003 aw
- Verifiable with independent salt standards
- Repeatable - different users, different locations, same result
- Portable - the meter weighs just 7 pounds
- Easy to use - precise measurements with minimal training
- Secure - offers administrative control over calibration and sample data