ILT77CE Germicidal Radiometer

Germicidal Radiometer

ILT77CE Germicidal Radiometer

Part Number: ILT77CE Germicidal Radiometer


  • NIST – traceable calibration at 254 nm
  • Measurement of Low Pressure Mercury Lamps ONLY
  • Removable protective boot (not shown)
  • Simple 1-button operation, auto shutoff
  • Hold feature
  • 4½ - digit readout
  • Spectral response 214 – 360 nm ("UVC")
  • 9 volt battery operated
  • 3 foot detector cable
  • Made in the USA

ILT77 Spectral Response Curve

The use of germicidal low-pressure mercury lamps for UV disinfection has rapidly expanded into a wide array of industrial, commercial, and municipal applications such as HVAC, food processing and water treatment.


The increasing popularity of these UV disinfection lamp systems has created a requirement for a simple, economical, yet highly accurate means of monitoring the lamp output to ensure their peak germicidal effectiveness.


The ILT77CE Germicidal UV-C Light Meter / Radiometer was specifically designed to easily and directly measure the output from conventional low pressure mercury germicidal lamps only. The included XP77 detector comes with three foot cable and a teflon diffuser.


The system measures a spectral range of 214 to 360 nm ("UVC") with a NIST traceable calibration.


The meter has a 4½ - digit display handling up to 199.99 mW/cm2, with a resolution of 0.01 mW/cm2. Readings are taken using a single button, and the meter shuts off automatically after 2 minutes to preserve the life of the 9 volt battery. It is enclosed in a removable cushioning boot (not shown) that protects the unit from accidental falls and acts as an instrument stand or hanger.


Each system is individually calibrated to NIST-traceable standards and is supplied with a calibration certificate.