Proteus Multi-Parameter Water Quality Sensors

The Proteus is a multi-parameter sensor platform for accurate and reliable measurements of BOD, COD, TOC and Coliforms (total, E. coli or fecal) in temporary and permanent applications.


  • Built-in wiper cleans optical sensors prior to each measurement
  • Optional internal battery pack for standalone deployments
  • SDI-12 and RS-485 Modbus output for integration with data loggers & PLC's
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The Proteus is a unique, patented and scientifically proven multi-parameter water quality probe. It can be fitted with up to 12 different sensors which can measure a multitude of different parameters simultaneously. Included in this list of sensors are an array of cutting-edge fluorometers that enable the previously unachievable real-time monitoring of:

  • Biochemical Oxygen Demand (BOD): BOD is a measure of the amount of oxygen that is used by bacteria and other microorganisms during the aerobic decomposition of organic matter.
  • Chemical Oxygen Demand (COD): COD is a measure of the amount of oxygen that is required to dissolve both organic and inorganic matter with the water.
  • Total Organic Carbon (TOC): TOC is a measure of the total amount of carbon present in organic compounds in a water source.
  • Dissolved Organic Carbon (DOC): A subset of TOC, dissolved organic carbon is the fraction of TOC which can pass through a 0.22 - 0.7µm pore size filter.
  • Total Coliforms, Fecal Coliforms and E. coli Coliforms: Coliforms are rod-shaped, gram negative bacteria. Total coliforms (TC) include all coliform bacteria that are present within the water source.
BOD Parameter Specifications
Units BOD mg/l
Range** 0-300 mg/l
Resolution 0.01 mg/l
Accuracy ±5 % of reading*
Comments Local site calibration can improve accuracy


Coliform Counts Parameter Specifications
Units CFU/100 m
Range** >1 count/100ml
Resolution 1 count/100ml
Accuracy ±10 Coliforms*
Comments Local site calibration can improve accuracy. Can be used for fecal coliforms, E. coli or total coliforms


COD Parameter Specifications
Units COD mg/l
Range** 0-600 mg/l
Resolution 0.01 mg/l
Accuracy ±5 % of reading*
Comments Local site calibration can improve accuracy


DOC Parameter Specifications
Units DOC mg/l
Range** 0 - 400 mg/l
Resolution 0.01 mg/l
Accuracy ±5 % of reading*
Comments Local site calibration can improve accuracy


TOC Parameter Specifications
Units TOC mg/l
Range** 0 - 500 mg/l
Resolution 0.01 mg/l
Accuracy ±5 % of reading*
Comments Local site calibration can improve accuracy


General Specifications - Proteus 35
Diameter 89 mm (3.5")
Length - w/o Battery Pack 483 mm (19")
Weight - with IBP 4.1 kg (9.0 lbs)
Number of Sensors Up to 11
Optional Battery Pack 8 “C” cells


General Specifications - All Versions
Internal Power Battery Life 1 to 24 month depending on sensors / logging rates
External Power 5-15 vdc
Operating Temperature 0 to 50 °C non-freezing
Calibrated Range 0 to 30 °C non-freezing
Depth Rating 200 m
Communications USB, RS232, Modbus RS485, SDI-12
Sample Rate 1 Hz
Data Memory >1,000,000 logged readings
Logging Rates 1 second to 1 day
Warranty 2 years (All sensors excluding ISE’s)


*providing adequate field calibration
**customized ranges are available

  • (1) Proteus 35 base unit with temperature sensor
  • (1) Calibration cup
  • (1) Sensor guard
  • (1) Guard weight
  • (1) USB PC cable
  • (1) Digital manual
  • (1) Proteus Software Manager
Questions & Answers
How does Proteus technology differ from UV-Vis?
The only similarity between the two is that they both engage with the UV portion of the EM spectrum; however that is where the comparisons end. Where UV-Vis focuses on the absorption of UV and visible wavelengths, Proteus’ optical sensors utilize the intrinsic fluorescence of organic matter through fluorescence spectroscopy. Known substances, such as the amino acid Tryptophan, fluoresce at particular UV wavelengths when excited by UV light. This knowledge has been used to develop cutting edge sensors and algorithms to quantify TLF, CDOM, BOD, total coliforms and more; bringing the Proteus to the forefront of water quality technology.
Can I customize the Proteus with different configurations of sensors?
The Proteus can house up to 12 physical sensors on one probe, and these can be retrofitted so do not all need to be purchased at the time of the initial order. Some sensors such as fluorometers can be swapped out like for like, for example replacing Tryptophan with CDOM – this will still require recalibration and potentially changing of coefficients.
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