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HydroRad Models

HydroRad-E2 Two-channel Radiometer System

The HydroRad-E2 measures upwelling and downwelling light simultaneously, through a light collector mounted on each end of its case.  With an irradiance collector on top and a radiance collector on the bottom, it is ideal for measurements of remote-sensing reflectance.  Like all HydroRad models, it is a completely self-contained measurement system.


  • Irradiance collector on top surface
  • Radiance collector on bottom
  • Calibrated Wavelength Range: 350 nm to 850 nm
  • Pixel Resolution: 0.30 to 0.35nm
  • Automatic exposure control: spectrometer integration time from 21 ms to 20 seconds, depending on light levels.
  • Instrument is shipped fully calibrated for absolute radiometric measurements.


shown with Irradiance collector on top surface

Radiance collector in center of bottom end cap

Data Logging

  • Sampling control options:
    • Autonomous control by internal real-time clock
    • Manual control by case-mounted switch
    • Real-time control via Windows software
  • 128 MB non-volatile storage holds more than 20,000 full-resolution spectra (larger capacities available for special applications). 
  • Calibration can be applied to data by the HydroRad, or externally on a PC.
  • Variable, programmable sampling rates.


  • Diameter: 13.3 cm (5.25")
  • Body length: 30.5 cm (12"), 36 cm (14") including connectors
  • Weight: 3.3 kg dry, 0.5 kg submerged


  • Internal rechargeable batteries provide up to 14 hours of continuous operation
  • Optional external power supply: 10V to 15V, 170 mA typical
  • Power/Data Connector: Subconn MCBH8M; Mate MCIL8F
  • Optional 8-pin slave port: Subconn MCBH8F; Mate MCIL8M
  • Data Interface: RS232, selectable 9600 to 230 Kbaud


  • Operating Temperature: 0 to 35 C
  • Maximum Depth: 200 m
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All specifications subject to change without notice.