MS1800 - VOC in Gas Analyzer

Compact, Efficient, Robust

Measures and monitors VOCs of industrial effluents, in drains and in the sewage system.

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MS1800 Touchscreen Version

The MS1800 is a VOC / Hydrocarbon Concentration Analyzer designed for measuring gases in drains and outflows from industrial facilities. The instrument senses gases or volatiles providing a measurement system with very low maintenance requirements. Taking a measurement every 2 seconds, the MS1800 is accurate from less than 1 ppm to 1,000 ppm concentrations, dependent upon the target gas, and its wide dynamic range allows it to be used in a wide variety of environments.

A user programmable Alert threshold can be set, connecting to relay outputs and indicators on the front panel. This allows connection to other peripheral equipment such as isolation valves, pumps, samplers or audio-visual alarms. A 4 – 20 mA output is available for connection to a PLC or SCADA system.


  • Monitoring of VOCs in gas streams
  • Monitoring of drains and effluent discharges
  • Detection of explosive gases
  • Oil and Fuel Leak Detection
  • Odour Control
  • Land Remediation


  • Low operating and maintenance costs
  • High reliability
  • No reagents
  • Field proven technology

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Industrial effluent monitoring

The MS1800 VOC gas analyzer is used to monitor the industrial effluent from factories and business premises to ensure that they are complying with environmental regulations.

Discharge of VOCs into wastewater is an endemic problem in chemical processing and other industrial processes.

For this reason, many industrial facilities have purification plants to remove the bulk of these contaminants from the water before it’s discharged.

However spills can overrun the treatment capacity and lead to illegal discharges, pollution, fines and PR disasters.

When this happens, it is likely that the environmental agency will ask for expensive on-line TOC analysers to be installed, which require a lot of reagents and are an additional cost.

By installing an MS1800 VOC analyser at the effluent, you can be notified as soon as the values start to increase and take appropriate actions, avoiding all the problems associated with unexpected pollution events.

Sewage System Monitoring

Hydrocarbons in sewage lines pose a threat to maintenance personnel and could potentially contaminate the sludge in a sewage treatment plant.

Sludge might become contaminated with hydrocarbons as the result of defective oil separators, unintentional spills or even dumping.

Once sludge contains hydrocarbons it has to be treated as chemical waste rather than fertiliser. This can significantly increase the price of disposal.

By using the MS1800 VOC Gas analyzer, we can detect peak in the concentrations of VOCs in the sewage system and take appropriate actions, thus optimizing the treatment process

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Minimum Maximum
Detection Range 1 ppm 1000 ppm
Display Range (Default) 0 ppm 1000 ppm Configurable on commissioning
Repeatability -5% +5% 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 / 32 °F 40 °C / 104 °F 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 / NEMA 4X
Instrument Weight 5 kg / 11 lbs
Instrument Dimensions 300 x 200 x 132 mm
11.8 x 7.8 x 5.2 inches
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 100 ppm toluene standard 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
MS1800 - VOC in Gas Analyzer Datasheet PDF
What does the MS1800 VOC Gas Analyzer actually measure?
The MS1800 measures the concentration VOC gas measured against a target gas standard (usually toluene)
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 ppm, is in the range from 0 to 500 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 analogue output.
How is the MS1800 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 MS1800 alert the user to high concentrations of gas?
The MS1800 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.