HOBI LABS Hydro Optics, Biology and Instrumentation Labratories
HOBI LABS Lighting the way in aquatic science
About Hobi Labs Contact Hobi Labs
Site Map
Home Page
  ProductsLight MeasurementHydroRad Hyperspectral Radiometers HydroRad Models 

HydroRad Models

HydroRad-3 Triple-channel Radiometer System

The HydroRad-3 measures three full-spectrum radiometric quantities simultaneously through fiber-optic cables.  Each cable is equipped with the light collector type you specify.  The cables allow you to position and orient the light collectors in any way that suits your measurement, or to measure the same quantity at different locations.  Like all HydroRad models, it is a completely self-contained measurement system with sophisticated data logging and interfacing capabilities.


  • 3 fiber-optic light collectors of your choice
  • Fiber optic cable length: 3m standard, shorter or longer available
  • 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.
  • Shipped fully calibrated for absolute radiometric measurements.


shown with 3-meter cables,

mounted in optional

deployment frame.

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: 46.6 cm (18.3"); 53 cm (21") including connectors
  • Weight: 5.3 kg dry, 1 kg submerged


  • Internal rechargeable batteries provide up to 10 hours of continuous operation; days or weeks of intermittent operation
  • Optional external power supply: 10V to 15V, 220 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
Copyright © 1998-2019 by Hydro-Optics, Biology, & Instrumentation Laboratories All rights reserved.
All specifications subject to change without notice.