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Thygen - Model EK33 -Fog and Frost Detection System
At the heart of the THY6AN EK33 system is a high precision, computer-controlled dew point mirror-thermohygrometer. For use in fog detection systems, this measuring principle has been refined in the past few years. THYGAN EK33 measures both air temperature and dew point temperature with very high accuracy. From these two temperatures, the relative humidity is calculated. The sensor housing is heated if there is danger of fog. When fog actually arrives, the heating causes the fog droplets to evaporate. The dew point mirror then measures the artificially increased water vapour pressure so produced. As a result, the measurement results include information concerning the fog density. The apparatus resists street air pollution: the critical internal sensor components are well protectively installed, and in addition, are cleaned on a regular basis by means of a cleaning mechanism.
The cooled dew-point mirror measuring principle is
conservative, i.e. a physically well-defined procedure is made use of. A regular calibration check within the scope of quality assurance is therefore necessary at most in 5-year periods.
The THYGAN EK33 fog detection system consists of two parts:
- THYGAN EK33-G transmitter
- THYGAN EK33-St control unit
The distance between the two parts, assuming a cable of suitable cross-section, can be up to 500 m. This is also valid for the distance between the control unit and data collection.
- Detects fog by means of a precise water vapour measurement
- Thermohygrometric, non-optical, measurement method, based on a sensor proven over a number of years
- Integrated air temperature sensor
- Maintenance-free operation for a period of several years
- No measurable ageing
- No problems with dirt
- The highly accurate and reliable humidity values improve black-ice early warning (danger of slippery frost on cold road surface)