Modern Water - Monitoring Division

Modern Water - Monitoring Division

- Model 1200 - On-line VOC and Oil in Water Concentration Monitor



The Multisensor1200 is a fully quantitative VOC or Oil in Water monitor system designed for clean and waste water monitoring applications. It utilises a non-contact and reagentless measurement technique, sensing headspace gases or volatiles in a sample tank, and provides a measurement system with very low maintenance.

The Multisensor1200 is accurate to low parts per billion ppb (μgl-1) concentrations and its wide dynamic range allows it to be used in a wide variety of applications. It has been designed as a fully quantitative, low-level VOC and oil in water monitor, with output in μgl-1total VOC.

The Multisensor1200 includes the measurement instrument which is housed in a robust steel enclosure, powered from either 90 - 240V AC or 24V DC sources. Also included is a stainless steel sample tank and associated pipework and control valves. The whole system is mounted on two 12mm thick PVC boards.

Alarms can be generated to either signal that preset levels have been exceeded or to close/open valves for in line control. Communications options such as 4 - 20mA, Profibus and Modbus are all available. The Multisensor1200 is ideal for monitoring performance of activated carbon beds.

All that is required is the water supply, drain and power.

  • No reagents
  • Low maintenance
  • Low ppb (μgl-1) detection limits
  • Output in ppb (μgl-1)
  • Fully quantitative concentration monitoring
  • Accurate environmental and process monitoring
  • Real time, online

The Multisensor monitors work on the principles of headspace gas equilibrium (Henry’s Gas Law). Water flows though the sample tank. Equilibrium is reached in the sample tank and the gas in the headspace is sampled by an “e-nose”.

The “e-nose” is an array of four proprietary sensors. Each sensor has a specific non-conductive polymer coating that selectively reacts to compounds dependent upon molecular weight, polarity and molecular diameter.

Results of VOC in the water are calculated compensating for different ambient environmental conditions.

  • Protection of boreholes
  • Water treatment process monitoring
  • GAC filter monitoring
  • Monitoring of raw water intakes
  • Detection of oil and fuel discharges
  • Land and waterway remediation

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