Measurement of biologically effective ultraviolet radiation from sunlight and from artificial sources with wavelengths above 280 nm.
  Plant, marine, climatological ozone or other biological impact studies that require continuous field measurements over long periods of time.
  Correction of spectroradiometric measurement errors cause by the variations of irradiance during the scan.
  Sunburning time measurements for media and research organizations that provide public information about the effects of UV solar radiation.



digital (UV signal and sensor temperature).

Data acquisition:

dedicated computerized data logger with liquid crystal display, keypad, serial communication port and parallel printer port; accommodates 2 detectors simultaneously; optional analog output.

Dose period:

selectable from 1 minute to 1 hour.

Internal memory:

stores up to six months of 1 hour dose integrals and sensor temperature from two detectors in a nonvolatile memory.

Data integrity:

nonvolatile memory; internal rechargeable power backup for the recording circuitry; automatic temperature compensation corrects data if ambient temperature exceeds specifications or AC power is lost.


compatible with any computer and modem equipped with an RS232 serial port; menu organized remote setup and data retrieval; user selectable baud rate from 300 to 9600 bps.

Power source:

universal 90-250 VAC, 50-60 Hz or 12 VDC.

The model 501 is a complete plug-and-play system including the detector for outdoor use, computerized controller/data logger, and connecting cables. It is easy to install and use. 


Specifications: UV Biometer Model 501

Spectral range:

280-400 nm, per Erythema Action Spectrum

Measurement range:

0 to 10 MED/Hr (Minimal Erythemal Dose per Hour)

Angular response:

within 5% from ideal cosine for incident angles

Response time:

1 second (0.1 second on demand)

Temperature correction:

1% per °C


>1 (Radiation Amplification Factor calculated for 30 deg solar zenith angle and 0.27 cm ozone column)

Operating temperature:

-40 to +50 °C ambient

Operating environment:

outdoors or underwater (max. depth 15 feet or 5 meters)


2 lbs (0.9 kg) without cable


5.5" H x 5.9" Diam. (14 x 15 cm)


with hermetic connector at detector end; 50 ft standard length, up to 200 ft. can be ordered; approx. weight 0.1 lbs per ft


3 leveling legs locked in a quick release base; circular level mounted on the detector

Analog Detector
UV Signal Output:

0-2.5V, 0.250[V/(MED/hr)], 0.5mA max

Sensor Temperature output:

0-1V, 1V=25°C, sensitivity 20mV/°C, 0.5mA max

Power Requirements:

5.5-25V/5mA max for signal circuit. 11-15V/1A max for temperature stabilization

Recorder of Model 501
Temperature range:

0 to +50C

Operating environment:

indoors, no water condensation

• UVB BIOMETER MODEL 501 RADIOMETER Meters_Model-501-.pdf


501 UV Biometer Owners Manual (482K) 501 UV Biometer Owners Manual (Spanish) (107K) app114.pdf UV and Ozone Measurements provide Meteorological Data (34Kb)
Ultraviolet radiation as applied to photoclimatherapy at the Dead Sea (114K) A.I. Kudish, PhD, D. Abels, MD, and M. Harari, MD - International Journal of Dermatology 2003, 42, 359-365
Inter-comparison of the solar UVB, UVA and global radiation clearness and UV indices for Beer Sheva and Neve Zohar (Dead Sea), Isreal (259K) A.I Kudish, V. Lyubansky, E.G. Evseev, A. Ianetz - Energy 30 (2005) 1623-1641
The Measurement and Analysis of Normal Incidence Solar UVB Radiation and Its Application to the Photoclimatherapy Protocol for Psoriasis at the Dead Sea, Israel Avraham I. Kudish, Marco Harari and Efim G. Evseev - Photochemistry and Photobiology, 2011, 87: 215–222
The analysis of ultraviolet radiation in the Dead Sea basin, Isreal (126K) A.I. Kudish, E. Evseev, A.P. Kushelesky - International Journal of Climatology, Vol.17 1697-1704 (1997)
Statistical relationships between solar UVB and UVA radiation and global radiation measurements at two sites in Isreal (165K) A.I. Kudish, E. Evseev - International Journal of Climatology, Int. J. Climatol. 20: 759-770 (2000)
Statistical analysis and inter-comparison of the solar UVB, UVA and global radiation for Beer Sheva and Neve Zohar (Dead Sea), Isreal (256K) A.I Kudish, V. Lyubansky, E.G. Evseev, A. Ianetz - Theor. Appl. Climatol. 80, 1-15 (2005)
app118.pdf Interfacing the 501 Biometer to a Campbell data logger (37Kb)
UV-Biometer - A Broad Band Instrument Complementing Ozone Measurement With Ground Based UV ExposurePresented at Quadrennial Ozone Symposium Charlottesville, Virginia, USA June (1992) Daniel Berger, Marian Morys
Calibration of The Broad Band Radiometer(describes 501 Radiometer calibration) Daniel Berger, Marian Morys
The Accurate Measurement of Biological Effective Ultraviolet Radiation. (135K) Paper was presented at the International Symposium on High Latitude Optics, Tromso, Norway, July 1993 Marian Morys, Daniel Berger
Also available with a suntracking attachment, Model 505
501-RD UV Biometer Recorder
501DAC-1 PC Board to convert Digital to Analog output, 2 channel
Additional Cable
Included Accessories
Required Accessories

1 year Standard Warranty

SOLAR LIGHT COMPANY warrants that the equipment has been carefully tested, inspected and left the Factory in proper working condition, free of visible defects.  SOLAR LIGHT COMPANY warrants the equipment to be free from defects in material and workmanship, under normal use and operation, for a period of one (1) year after the date of initial operation, or demonstration; or eighteen (18) months from the date of shipment from the Factory; or whichever occurs first. The warranty is limited to the free replacement of all-defective parts and free labor during the first year of warranty.  Defective parts replaced under this warranty shall become the property of SOLAR LIGHT COMPANY. The above stated Warranty is subject to the following conditions: Equipment being installed within the United States of America, Canada, or sold by authorized SOLAR LIGHT COMPANY representatives or their agents outside the continental United States. The equipment being installed is operated and maintained in accordance with SOLAR LIGHT COMPANY’s operating instructions, maintenance instructions and specifications. Utilization of only SOLAR LIGHT COMPANY’s authorized parts and components.  The utilization of a duly authorized representative for all work performed on SOLAR LIGHT COMPANY equipment during the warranty period.  Any variation(s) to the above warranty must be in writing and mutually acceptable by SOLAR LIGHT COMPANY and the customer. The warranty shall not apply to damages resulting from errors in installation, nor shall it apply to any equipment, which has been subject to damages, alterations or misuse by the purchaser.  Parts of the equipment, which would be generally considered as expendable service items during normal use, such as fuses, lamps, detector shields, etc., are not covered under the warranty. THERE ARE NO WARRANTIES, WHICH EXTEND BEYOND THIS DESCRIPTION, AND EXPRESSLY NO IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SOLAR LIGHT COMPANY BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR ANTICIPATED LOSS OF PROFITS SUFFERED BY THE PURCHASER.