Find out how to submit your ultraviolet data to the World Ozone and Ultraviolet Radiation Data Centre

APPLICATIONS
•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 radiation



CONFIGURATION
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.

The model 501A is a standalone detector that can be connected to any data logger.  It is recommended for sites with existing data collection equipment or requiring data loggers designed for outdoor use. A detector cable is provided.


SPECIFICATIONS

Detectors of Model 501 and 501A

Spectral range:   290-320 nm, close to Erythema Action Spectrum <Picture>
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 error:
RAF: >1 (Radiation Amplification Factor calculated for 30 deg solar zenith angle and 0.27 cm ozone column)
Oper. temperature: -40 to +50 degC ambient
Environment: outdoors or underwater (max. depth 15 feet or 5 meters)

Recorder of Model 501 only

Temperature range: 0 to +50C
Environment: indoors, no water condensation

FEATURES

Model 501

Output: 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
Communication:
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

Model 501A

Output:  analog (UV signal and sensor temperature); compatible with most data loggers
Power source:  11 to 15 VDC/1A max. (5mA without temperature stabilization)

PHYSICAL CHARACTERISTICS

Detectors of Model 501 and 501A

Weight:  2 lbs (0.9 kg) without cable
Dimensions:  5.5" H x 5.9" Diam. (14 x 15 cm)
Cable: 
with hermetic connector at detector end; 50 ft standard length, up to 200 ft. can be ordered; approx. weight 0.1 lbs per ft
Mounting:  3 leveling legs locked in a quick release base; circular level mounted on the detector

Recorder of Model 501

Weight:  4 lbs (1.8 kg)
Dimensions:  6.3" W x 3.1" H x 9.5" D (16x8x24 cm)