The ILT490 verisons contain the same vacuum phototube and filtration as the original IL390/IL290 to allow easy upgrades for existing ILT customers, assuring the same UV spectrum is measured. The ILT490 all-in-one Belt Radiometer comes in two versions: the ILT490 broadband UV for 250-400 nm, and the ILT490C UVC for 205-345 nm.

The ILT490 works with many UV lamp options from Iron doped, H and D type UV lamps, as well as standard UV sources, but is not recommended for flashing or pulsed UV lamps. The ILT490 series has an auto shut off feature that stops measurement once less than the minimum exposure level is measured for 5 consecutive seconds.

For customers needing long term integration, ILT offers a special version of code that does not have autoshut off (ILT490ON, ILT490CON). The “ON” code disables the profiling mode, allows long term measurement and displays the peak irradiance as well as total integrated exposure.