UV APPARATUS FOR FLUID TREATMENT

摘要

An ultra-violet water sterilisation system comprises an elongate treatment chamber (10) having an axial ultra-violet lamp (14) arranged to output light having a wavelength of 245-265 nm. The skin temperature of the lamp (14) is maintained at a constant level by energising a fan and/or a heater, which are controlled by temperature sensors (21, 22). A microprocessor (28) calculates the dose of radiation delivered to the water from the product of the UV intensity and the exposure time. The UV intensity is measured using a photodetector head (23) mounted to the side of the chamber (10). The photodetector head (23) comprises a reverse biassed vacuum photodiode which acts as a sensor for UV light in the wavelength 245-265 nm.