PUV-2500 and PUV-2510 UV Radiometer

PUV-2500 mounted in optional lowering framePUV-2500 mounted in optional lowering frame

Biospherical Instruments' PUV-2500 Profiling Ultraviolet Radiometers are battery-powered, submersible radiometers that may be operated as instantaneous profilers of UV radiation and as data loggers — integrating and recording data from all sensor channels at user-defined intervals. The system has been specifically designed to measure downwelling (cosine) irradiance, pressure/depth, and temperature. Irradiance bands are 305, 313, 320, 340, 380, and 395 nm, and PAR (400–700 nm). The 305 nm sensor is designed to respond to the region of the UV-B spectrum strongly affected by atmospheric ozone concentration. Similarly, the 313, 320, 340, and 395 nm detectors incorporate custom interference filters that, in combination with UV-passing/light-blocking filters and sensitive silicon photodiodes, minimize errors associated with spectral leakage.

Key Features

  • High speed, very wide dynamic range
  • Standard 6 UV wavelengths and PAR downwelling irradiance
  • Standard upwelling natural fluorescence radiance channel
  • Small, rugged, lightweight, battery-powered
  • Hand deployed in lowering frame or free-fall (optional)
  • Available with a radiometrically matching surface sensor (PUV-2510)
  • Individual cosine collector simplifies optical calibrations and is optimized for use underwater (PUV-2500) or in air (PUV-2510)
  • Requires just a single COM port for both instruments (PUV-2500 and PUV-2510) 

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Screen shot of PROFILER softwareScreen shot of PROFILER softwareThe PUV-2510 radiometer was specifically designed as the radiometrically matching surface reference sensor for the PUV-2500 Profiling UV Radiometer. Like the PUV-2500, the PUV-2510 measures downwelling irradiance at 305, 313, 320, 340, 380, 395 nm and PAR (400–700 nm). The design features a Teflon diffuser and quartz optics to achieve outstanding cosine response in air.

BSI provides PROFILER, a Windows-based data acquisition and analysis software package. This software allows the host PC to acquire data and display it on a monitor. The software includes full graphical display with multiple user-selected channels. Data files are recorded in an ACCESS® database format. The profiler package includes user-specified configuration to speed profile setup.

PUV System Electronics Specifications

  • Microcontroller: High performance PIC17C756 CMOS microcontroller featuring 8 bit, 18.432 MHz frequency, internal 16 K non-volatile EEPROM
  • Data Acquisition: A high accuracy 16 bit ADC with a PGA input yielding a 10 VFS and 1.3 µV LSB. The microprocessor enables auto zero and gain corrections for the A/D and PGA. A set of internal voltage references are also used in calibrations. The 32-channel multiplexer selects analog signals from up to 19 photodetectors, temperature sensors, and pressure and tilt/yaw sensors. Real-time data averaging can be selected from 17 Hz to 1 per hour.
  • Photodetector Preamps: Each detector is individually amplified by an electrometer grade FET Op Amp with variable gain. The available gains (100,000 V/A, 306 V/A, and 1010 V/A) cover 10 decades of light levels with minimum detectable signals of less than 10 femptoAmps.
  • System Data Rate: User adjustable with a maximum rate of 20 Hz and 57,600 Baud
  • Channel Sampling Time: Scan time is typically 15 ms when reading including additional processing time, all heads are synchronized to start scans within 500 µs ±175 ns
  • Optional Sensors: dual-axis instrument inclinometer

PRR-2500 Optical Specifications

  • Standard Wavelengths: 305, 313, 320, 340, 380, 395, PAR
  • Optional Wavelengths: Consult factory for availability.
  • Bandwidth: 10 nm FWHM standard except 305 (controlled by atmospheric ozone cutoff)

Irradiance Array Specifications

  • Filter Photodetectors: 7 downwelling irradiance wavelengths standard
  • Filter Type: Custom low-fluorescence design, 5 cavity interference filters
  • Cosine Collector: Teflon-covered quartz.
  • Angular Response: ±2% from 0° to 65°; ±10% from 65° to 85°
  • Out-of-band Rejection:  1x10-6
  • Typical Saturation: 105 µW cm-2  nm-1 
  • Noise Equivalent Irradiance: 10-5 µW cm-2 nm-1

Radiance Detector Specifications

  • Filter Photodetectors: One filter with Natural Fluorescence Response
  • Detectors: Custom 13 mm2 silicon photodiode
  • Typical Saturation: 103 µW cm-2 nm-1 sr-1
  • Noise Equivalent Radiance: 10-6 µW cm-2 nm-1 sr-1

PUV-2500 Physical Specifications

  • Diameter: 10.2 cm
  • Length: 40.5 cm
  • Depth Range: 350 m (recommended max. operating)
  • Materials: PET plastic housing; plastic fins (optional); stainless steel lowering frame
  • Weight: 3.2 kg in air, near-neutral in water (without fins)
  • Temperature Rating: –5 °C to 50 °C
  • Typical Performance: Terminal velocity and attitude within 2 m; free-fall orientation less than 2° tilt

PUV-2510 Surface Sensor (Order Separately)

  • Optical: Specifications match PUV-2500 except optimized for use in air
  • Diameter: 10.2 cm 
  • Length: 35.6 cm
  • Materials: Aluminum housing
  • Weight: 3.4 kg in air
  • Temperature Rating: –10 °C to 50 °C

PUV Deckbox

  • Microprocessor: A separate PIC17C756 CMOS microcontroller is used to translate the high level PC program commands to individual head commands, buffer the high volume of data transmitted from the heads and provide exact timing of data collection between heads
  • Cable: 2 m RS-232 serial interface
  • Battery Power: Rechargeable 12-V gel cell battery; LED indicator light for low battery voltage
  • AC Adapter/Charger: Universal 90–240 VAC, 50–60 Hz
  • Output: Single COM port for both instruments (PUV-2500 and PUV-2510)


  • PUV-2510: Radiometrically Matching Deck Sensor
  • PUV-514: Additional Input for Transmissometer. Includes: bulkhead connector, dummy/selector plug if PUV-2500 is equipped with a PUV-683, and a 1-m interface cable. Note: Transmissometer is not included.
  • PUV-515: Lowering Frame Upgrade to Mount Transmissometer
  • PUV-552: Instrument Inclinometer for the PUV-2510
  • PUV-565: PUV Series Travel Case. Fits PUV-2500 in lowering frame with PUV-2510, deckbox, AC adapter and cables (up to 100  m of underwater cable; molded case with retractable wheels; meets ATA dimension requirements for checked baggage, but full system may exceed 18 kg, depending on cable length.

Note: This instrument replaces the PUV-500 UV Radiometer 

Last Updated on Tuesday, 12 October 2010 12:27
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