MS1900 - Oil in Water Monitor

Hydrocarbons, VOCs, fuels and oils

Detects 0.1 - 20 mg/l: ideal for municipal and industrial processes

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MS1800 Touchscreen Version

The MS1900 is an on-line Oil in Water analyzer designed to provide continuous measurement of VOCs in industrial and trade effluent discharge points. Regulations on the quality of effluents from trade premises and factories are getting stricter and stricter and VOCs are now in the spotlight.


  • Monitor water abstraction points such as raw river water, boreholes and reservoir water
  • Monitoring for oil in water contamination
  • Detect VOC contamination in industrial wastewater
  • Monitor drain and stormwater systems for flammable liquids
  • Surface water systems for fuel pollution
  • Offer a monitoring solution for air, land remediation and industrial applications
  • Detect VOC breakthrough in carbon beds
  • RO membrane protection
  • Measurement of VOCs in process water

Features and Benefits

  • No sensor contact with water: low maintenance, no sensor cleaning
  • No reagents: low running costs
  • Measures both Polycyclic Aromatic Hydrocarbons (PAHs) and VOCs
  • Electronic Nose: not affected by turbidity
  • High sensitivity: ideal for potable water
  • Can be calibrated for specific substances: used to monitor known spills
  • Catches VOC chemical spills not just hydrocarbons
  • Alarms to SCADA and other communication interfaces

For more information on the principle of operation, click on the FAQs tab.

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Industrial Effluent: The Problem

Discharge of VOCs into wastewater is an endemic problem in engineering, chemical processing, food and beverage production and other industrial processes.

Spills can lead to illegal discharges, pollution, fines and PR disasters.

For this reason, some industrial facilities have purification plants to remove the bulk of these contaminants from the water before it is discharged, but even these suffer from failures and can be over run.

The cost of not monitoring your effluent

When spills happen large fines can be issued by the Environmental Agency and local, national and social media can turn an accident into a PR disaster with long-term implications.

Additionally it is likely that regulatory bodies will ask for expensive on-line TOC analyzers to be installed, which require a lot of reagents and maintenance at a very high additional cost.

The Solution

By installing a VOC Industrial Effluent Discharge Monitor at the effluent, you can be notified as soon as the values start to increase and take appropriate action, avoiding all the problems associated with unexpected pollution events.

The VOC Industrial Effluent Discharge Monitor is used to check the industrial effluent from industrial facilities and business premises to ensure that it is complying with environmental regulations.

Its contactless measurement technique means that:

  • It does not need reagents
  • Requires little or no maintenance between services
  • It’s robust and reliable
  • It is cost effective

Thanks to this analyzer you can monitor your effluent discharge and make sure that you detect promptly any problem, avoiding expensive fines and PR disasters.The system comprises the analyzer and the sampling system. As the water goes through the sampling tank, VOCs dissolved in the water move into the gas phase.

Multisensor’s sampling system helps the VOCs to get in the gas phase. This gas is then continuously analyzed and the VOCs concentration in the water is determined.

For applications where drains are being monitored the MS1800 can be used to directly sample gases on the drain. This provides a lower cost solution but reduces absolute accuracy.

Minimum Maximum
Detection Range 0.1 ppm 20 ppm
Output Range (Default) 0 ppm 20 ppm Configurable on commissioning
Repeatability -2% +2% See Note 1
Accuracy -15% +15% See Note 1
Measurement Frequency Continuous 15, 20, 30, 60 minutes modes available on request
Ambient Temperature 0 °C 40 °C See Note 2
Water Temperature 1 °C 40 °C See Note 2
Analogue Output 4 mA 20 mA Scalable to range required, max load 900 Ω
Analogue Output Isolation 400 V DC
Relay Voltage 50 V Alarm and Fault Relays with NO contacts
Relay Current 5 A
Service Interface USB-A to PC Using Multisensor Software provided
Data Storage μSD Card 6 months
Instrument Case IP65
Instrument Weight 5 kg
Instrument Dimensions 300 x 200 x 132 mm
Sampling Chamber Material Stainless Steel Optional: PVC
Sampling System Weight 12 kg Without water
Sampling System Dimensions 570 x 490 mm Mounted on its own PVC backboards
Sampling System Capacity 3 litres
Flow Limit Switch Contacts closed if flow below set point Option available on request
Water Flow Rate 2 l/min
Supply Voltage
  AC Version
  DC Version

90 V AC
10 V DC

240 V AC
15 V DC
50 Hz or 60 Hz
Power Consumption 9 W Typical 7 W during operation

Note 1:Measured against a 10 ppm toluene solution at standard temperature and pressure; accuracy can be further improved at points of interest, using bespoke calibration.Note 2:Climate control might be needed depending on process and ambient conditions

View Datasheet

Title Type Format
MS1900 - Oil in Water Monitor Datasheet PDF
What does the Drain and Effluent Monitor actually measure?
It measures the concentration VOC in water measured against a target gas standard (usually toluene). Other compounds can be targeted.
How often does the instrument provide a reading?
The instrument provides a reading via the 4-20 mA output continuously.
What is the reported value?
The reported value is Total VOCs in the effluent water, in ppm, is in the range from 50 ppb to 5 ppm
What is the principle of operation
The system samples the air above the effluent/sewage continuously; this air is then passed through the sensor which reacts with VOCs and measures their concentration. The concentration is then reported via the analog output.
How is the analyser calibrated?
The instrument is factory calibrated against toluene.
What are common target gases?
Petroleum Gas, Methane, Iso Butane, Kerosene, Ethanol, Diesel, Iso-butylene, Toluene, Acetone, Xylene, Heptane, Benzene, Methanol Mercaptan
What is the required maintenance? Is it expensive?
The instrument requires a service every 6 months to replace some low-cost components such as activated carbon filters and to make sure that there are no air leaks.
What is the warranty?
Every instrument comes with 1 year warranty from the shipment date
How does the analyzer alert the user to high concentrations of gas?
It incorporates a relay which is switched at a user definable threshold. This can be hardwired to valves/pumps and so on to stop processes very quickly. Alternatively the users SCADA system can also be used.