Guaranteed accuracy in humidity measurement

The Testo hygrotest 600 and 650 are stationery humidity transducers, certified by the National Physical Laboratories.

The Testo hygrotest 600 and 650 are stationery humidity transducers, certified by the National Physical Laboratories.

Highly accurate measurement and control of the twin factors of temperature and humidity are critical in many production processes, across a wide range of industrial sectors.

To meet the needs of these challenging environments, Testo has launched a series of humidity transducers and an accompanying sensor developed as a result of 10 years of research in-house at Testo.

Top of the range is the hygrotest 650.

Over its entire temperature range from -40 to +180C, the integrated processor can accept linearisation and compensation for humidity, ensuring high accuracy of +/-1% RH.

In addition to temperature and humidity, the hygrotest 650 can also calculate values for td and g/kg.

Industry standard 4 to 20mA technology for signal and power makes these stationary transducers quick and easy to install.

Calibration and adjustment for humidity on site are also simple to effect using Testo's reference probe and adjustment set.

The clear LED display makes readings easy to take in location, although up to 32 transducers can be analysed in parallel via a remotely configured PC.

Variable scaling of output signals from the 650 is also possible, with a variable cable length of up to 10m.

For HVAC applications where a lower degree of accuracy with fewer parameters is acceptable, Testo has produced a highly effective lower cost transducer, the hygrotest 600, which offers accuracy of +/-3% RH.

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