It is recognised that one of the major causes of damage to works of art, fine furniture, carpets, wall coverings and museum exhibits is light falling on the objects.

The most damaging part of the light is its ultraviolet (UV) content. Hanwell provide a range of instruments that enable the conservator to measure the levels of Lux and the UV content of light.

These instruments provide the conservator with the necessary information to protect their valuable exhibits. Using proven Hanwell radio technology, on-line measurements can be taken of the proportion of UV present (µW/lumen), the total amount of UV (mW/M2), and the amount of visible light (Lux).

Areas that would have previously required expensive and disruptive wiring can now be monitored by radio sensors with minimum disturbance of the environment,

The Hanwell Lux/UV radio telemetry sensors measure Lux in the range 10 to 2000 Lux. This is generally sufficient for conservation environments where a Lux of over 600 is not normally desired, but higher ranges can be supplied on request. The UV range is 10 to 1000 µW/Lumen.

The sensor is calibrated against a reference light source with known Lux and UV values. This calibration information is entered via the PC software. Muitiple calibrations can be entered corresponding to light sources having different spectra.

Specification
Dimensions	110x67x 23mm
Weight	65 grams
Case material	ABS
Power supply	9 volt PP3 battery, typical life 18 months
Lux sensor	Photometric diode detector
Colour response	Human eye
UV sensor	UV enhanced silicon photodiode
Angular response	Cosine
Channels	2
Radio frequency	457.6 MHz (up to 32 other channels available)
Power	10 mW
Range	2 miles over open ground
Transmit rate	4 seconds / 5 minutes
Lux
Visable wavelength range	400 to 700 nM
Visable power range	10 to 2000 lux (other ranges available)+/- 1%
Accuracy	+/- 1%
UV
UV proportion range	10 to 1000 µW / Lumen
UV power range	0 to 2000 mW /m2
UV wavelength range	250 to 400 nM
Accuracy	+/- 1% (calibration spectrum)