Proteus Multi-parameter Water Quality Sensor

  • Real-time Data For your choice of parameters
  • Measure Bacteria/Coliforms Proteus is the first instrument to measure bacteria/coliforms in drinking water in real-time
  • Self Cleaning Built in wiper which cleans sensors before every cycle
  • Easy Integration Easily integrated with telemetry/SCADA systems and other datalogging devices with external RS232/Modbus/SDI12
Product Options


An award-winning, patented, multi-parameter, real-time sensor platform to accurately and reliably measure BOD, COD, TOC and Coliforms (total, E. coli or faecal) in permanent and temporary applications.

The Proteus is the world’s first scientifically proven real-time sensor for measuring BOD that can measure a wide range of water quality, environmental and industrial applications. A multiprobe that measures your choice of parameter, all in one package, that can deliver data in the toughest field conditions. The Proteus has been designed for its ease of use, reliable data and economical operation.

Parameters include:

BOD, COD, TOC, DOC Optical Brighteners Ammonium
Dissolved Oxygen Nitrate EC / Salinity / TDS
Pressure ORP / REDOX Turbidity
Chloride Coliforms (faecal, E. coli, total) Crude Oils
pH Tryptophan CDOM
Temperature Refined Oils

The standard CPVC model has a CPVC body and sensor guard. An optional stainless steel model is also available. A range of power options are available including internal lithium battery packs, ideal for unattended logging, or multiple external power options of battery, mains or solar panel.

Manufactured by: Proteus Instruments
Model: Proteus Multi-parameter Water Quality Sensor

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


BOD/COD/TOC Loading to Wastewater Treatment Works
Combined Sewage Overflow event monitoring
Point Source Pollution monitoring
Total Coliform Monitoring (E. coli, total or faecal)
Efficiencies of Wastewater Treatment Works
Diffuse Pollution Monitoring
Groundwater Water Quality Monitoring
Survey tool combined with Bluetooth
SCADA, RTU and logger integration via RS232, SDI-12, Modbus RTU


BOD Parameter Specifications
Units BOD mg/l
Range** 0-2000 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 faecal coliforms, E. coli or total coliforms

COD Parameter Specifications
Units COD mg/l
Range** 0-4000 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 - 3000 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 - 3000 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")
Typical Weight - with IBP Standard CPVC Model: 2.85 kg (6.28 lbs)
Stainless Steel Model: 4.55 kg (10.03 lbs)
Number of Sensors Up to 11
Optional Battery Pack 8 “C” cells

General Specifications - Proteus 40
Diameter 102 mm (4.00”)
Length - w/o Battery Pack 483 mm (19")
Typical Weight - with IBP Standard CPVC Model: 3.00 kg (6.61 lbs)
Stainless Steel Model: 5.40 kg (11.9 lbs)
Number of Sensors Up to 13
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 as standard. Modbus RS485, SDI-12 and/or Bluetooth optional
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



Related products


BOD is an abbreviation for Biochemical Oxygen Demand. This is the English abbreviation, it is also shortened to DBO which is the short for Demanda Biológica de Oxigênio. BOD represents the amount of dissolved oxygen consumed during the decomposition of organic matter by aerobic organisms in water systems.
COD is an abbreviation for Chemical Oxygen Demand. DQO also means the same it is just the abbreviation of Demanda Química de Oxigênio, so is abbreviated differently to the English version. COD is an indicative measure of the capacity of a water system during the oxidation of soluble, inorganic compounds such as Ammonia and Nitrite.
Total dissolved solids (TDS) is a measure of the combined inorganic and organic substances dissolved in water. It is directly related to the electrical conductivity of water and as such can be used as an indication of change. TDS is only relevant in freshwater systems as salinity will dramatically increase the conductivity and therefore apparent TDS.
TSS is a custom parameter which we achieve through a specific calibration and algorithm applied to the turbidity sensor. We can accommodate custom particle sizes if a sample or reference is provided.
All our sensors come with a standard 24-month warranty and there is also the option to purchase an extended warranty
As each unit is a bespoke construction based on the client’s requirements, there is no “average” cost of the Proteus. Sensors are priced individually and depending on the parameters required depends on the sensor set-up that will be used. The best way to get an idea of a quote is to contact us via the enquiry form.
Cost of ownership is negligible due to the advanced technology and high specification we manufacture each unit to. They are completely re-agentless and require only periodic calibration (6-12 months on average) and cleaning, which is further reduced in frequency by the novel self-cleaning system (dependent on environmental factors). As such, they require no special expertise or equipment to maintain and the cost is relatively low, particularly in comparison to other ‘in-situ’ sensor systems.

No. The Proteus utilizes cutting edge fluorescence technology which is completely without reagent or manipulation to the environment it is entered into.

Very few as the Proteus is designed to be efficient and low maintenance. We advise purchasing spare wiper brushes, which generally are replaced every 6-12 months. In addition, you may require to purchase some calibration fluids every 12 months, however this is not a requirement for all sensors.
Our lead time is usually 6 weeks from the receipt of the order to the delivery of the instrument to the client. This can sometimes be increased/decreased depending on supply, and in special circumstances we can attempt to reduce the time if the instrument required is high priority.
None, the Proteus is a small and compact system which is easy to install, no matter what environment it is being placed into or whether the set-up is permanent or for spot-measurements. The Proteus is highly adaptable in that it does not require specialised buildings or kiosks as it can be deployed directly into water sources such as reservoirs and rivers. We also have extensive experience of installing using stilling wells and other set-ups which can be more suited to WWTWs and other water infrastructure. We have a dedicated team of experienced engineers who can work with you to devise the best installation of your Proteus.
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 utilises 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.
Watch our video on how to calibrate tryptophan HERE
It is a standard square thread of 8 threads per inch pitch. Major diameter is 3.18 inches and minor diameter is 3.08 inches.
Yes, the thread is standard square thread of 8 threads per inch pitch. Major diameter is 3.18 inches and minor diameter is 3.08 inches.