In-situ Marine Optics
  • IMG 2889



A Photosynthetically Active Radiation sensor designed for underwater applications, including integration into autonomous logging systems and vertical profiling packages.
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  • Benthic light availability monitoring
  • Numerically optimised optics for superior quantum response
  • High accuracy, large dynamic range
  • Internal calibration coefficient storage
  • Anti-fouling copper face-plate and high torque wiper
  • Internal Real Time Clock, Tilt and Temperature
  • Pin-compatible with standard oceanographic equipment
  • Australian designed, manufactured, calibrated and serviced


Detector Si photodiode
Bandpass 400 – 700 nm
Quantum response <5% RMS
Irradiance cosine response <3% (0 – 60°)
Calibration NIST traceable radiometric calibration
Range 0 – 2300 µmol m-2 s-1 (factory customisable)
Resolution 1.3e-6 µmol m-2 s-1
Acquisition 24 bit ADC
Sampling Rate configurable up to 10 Hz
Protocol RS-232 @ 19,200 bps
NMEA-style output yes
Input Voltage 7 – 28 VDC
Power Consumption 10 mA @ 12 VDC (150 mA during wipe)
Analog Output 0 – 4.97 VDC, 2.2 mV RMS
Connector Micro WET-CON MCBH6M
Length 140 mm (connector + 43 mm)
Diameter 67 mm
Weight 630 g in-air, 150 g in-water
Materials Acetal, Copper, PTFE, SS316
Depth Rating 300 m
Operating Temperature 0 to +50 °C



IMOview is GUI program that allows users to easily configure and display real-time data via serial communication. IMOview.exe for Microsoft Windows