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, scientifically-proven multi-parameter probe that uses both fluorescence and patented algorithms to monitor biochemical oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon (TOC), dissolved organic carbon (DOC) and total coliforms, fecal coliforms and E. coli coliforms in real-time. The instrument is designed for use in drinking water, wastewater, industrial, process, recreational swimming areas, aquaculture and food & beverage applications:

  • 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.

Proteus can be fitted with up to 12 different sensors to output over 30 parameters on a single instrument. Sensor options include temperature, conductivity, pH, ORP, dissolved oxygen, turbidity, CDOM, tryptophan, chlorophyll, blue-green algae, depth, and more. A central wiper on the turbidity sensor cleans the optical sensors prior to each measurement, reducing the maintenance requirements when continuously deployed. The probe can also be outfitted with a cabled Bluetooth battery pack for spot sampling with any Android/iOS device.

Included with the purchase is the Proteus base unit with temperature sensor, calibration cup, sensor guard, serial communication cable, serial to USB adapter, digital manual and Proteus Software Manager. Both SDI-12 and RS-485 Modbus RTU are standard outputs for interfacing with environmental data loggers and PLC's. Pair the multi-parameter probe with the NexSens X-Series data loggers and CB-Series buoys for cloud-based data in remote locations via WQData Data LIVE and cellular or satellite telemetry.

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 2.85 kg (6.28 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) Serial communication cable
  • (1) Serial to USB adapter
  • (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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