RMD with UV sensor for surface disinfection measurements

The radiometer RMD is currently available in a special version to prove the effectiveness of UVC surface disinfection based on the Sars-CoV-2 virus disinfection, known as Coronavirus or Covid-19, and other microorganisms.

Coronaviruses require about 6 J/m² at low humidity to disinfect the surface (D90, source: “Ultraviolet Germicidal Irradiation Handbook”). The highest dose reported for viruses for a 6-log-step reduction is 235 mJ/cm² for 253,7 nm [1]. However, the doses for uv disinfection of corona viruses rely on the used lamp and wavelegth.
In addition to classical UV low pressure lamps more and more UV LEDs and 222 nm FAR UV excimer lamps are used. This far UVC wavelengths are said to not penetrate through the outer layer on the surface of human skin but still efficiently inactivate the viruses and microorganisms [2], [3].
We are happy to support all academic, industrial and medical customers with our measuring instruments. Therefore we offer the RMD with UV UVGI sensors at a special price. In addition, we offer an accredited ISO 17025 / DAKKS calibration.

RMD features a wide dynamic range and extremely low noise. For this purpose, the sensor already contains a multi-stage amplification, an extremely precise analog-to-digital converter and a temperature sensor. The memory contained in the sensor contains all sensor identifications and the calibration history.
Two UVGI sensors can be read out simultaneously. The measured data are clearly shown on the graphical display. For measurements of mercury low pressure lamps we recommend an UVC UVGI sensor. For measurements of the novel UVC LEDs we recommend an UVBB UVGI sensor to overcome the overlap of filter edge at 280 nm and emission at 275 nm. For measurements of far UVC KrCl* excimer lamps emitting at 222 nm we recommend a special UV sensitive sensor.

Compared to the RM-12, the RMD features a significantly higher resolution of 24 bit, an extended measuring range of up to 7 orders of magnitude and dose measurement.  The device can be powered by a rechargeable battery or mains adapter and measures for up to 100 days at a time. The RMD is upgradeable to the RMD Pro.



  • Measurement of UVC radiation
  • Measurement of UVC LEDs & UVC light sources
  • Dose measurement
  • Proof of UVC surface disinfection

Use for UVC decontamination RMD & RM-22:

The RMD is the successor of the RM-22, which was successfully used in studies on disinfection.
Information and important notes on UVC decontamination of a hospital room can be obtained here free of charge:
M. Lindblad, et al., Ultraviolet-C decontamination of a hospital room: Amount of UV light needed, Burns (2019), https://doi.org/10.1016/j.burns.2019.10.004


Sensor connectors 2, fully digital, UVGI
Display graphical, 128 x 64 px
Display output 1 + 2 channels
Irradiance + Dose
Dimensions 160 x 85 x 35 mm
Weight 250 g

Spectral ranges digital radiometer RMD


Spectral range 200 - 280 nm (UVC)
230 - 400 nm (UVBB)
210- 380 nm (for KrCL*)
Measurement range 0-10 or 0-100 mW/cm²
Resolution 0,001 µW/cm²
recommended for proof of occupational safety 0 - 10 mW/cm² (high-sensitivity version)
Dose range 0 - 100 MJ/cm²
Calibration UVC-LP 253,7 nm
  UVC medium pressure (alter.)
  UV-LED 275 nm
  far UVC KrCl* eximer lamps
Dynamic range up to 10^7
AD conversion 24 bit
Temperature sensor integrated
Dimensions Ø 40 mm, h 35 mm
Optical area Ø 6 mm
Weight 160 g
Connecting cable 2 m
Operation temperature 0 to 40 °C
Storage temperature -20 to 60 °C
Humidity < 80% non-condensing


Calibration uncertainty 7,0% (k=2)
Linearity error < 1%
Ageing / year < 3%

[1] : Fluence (UV Dose) Required to Achieve Incremental Log Inactivation of Bacteria, Protozoa, Viruses and Algae by Adel Haji Malayeri at al.

[2] :  Germicidal Efficacy and Mammalian Skin Safety of 222-nm UV Light, Buonanno et al. Radiat Res., 2017 April ; 187(4): 483–491. doi:10.1667/RR0010CC.1.

[3] : Far-UVC light: A new tool to control the spread of airborne-mediated microbial diseases, D. Welch et al. DOI:10.1038/s41598-018-21058-w et al.