MS4000-S – VOC in Gas Monitor

Compact, Efficient, Robust

Measures VOCs in industrial effluents, drains, and sewage systems (1–3000 ppm).

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MS4000-S VOC Gas Analyser

The MS4000-S is a VOC / Hydrocarbon Concentration Analyser designed for measuring gases in drains and outflows from industrial facilities. The instrument detects gases or volatiles, providing a measurement system with very low maintenance requirements. Taking a measurement every 2 seconds, the MS4000-S is accurate from less than 1 ppm to 3,000 ppm concentrations, depending upon the target gas, and its wide dynamic range allows use in a 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.

Applications

  • 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

Benefits

  • Low operating and maintenance costs
  • High reliability
  • Field-proven technology

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Industrial Effluent Monitoring

The MS4000-S VOC gas analyser is used to monitor industrial effluent from factories and business premises to ensure compliance with environmental regulations.

Discharge of VOCs into wastewater is a persistent issue in chemical processing and other industrial processes.

Many industrial facilities have purification plants to remove the bulk of these contaminants from water before discharge.

However, spills can exceed treatment capacity, leading to illegal discharges, pollution, fines, and reputational issues.

When this occurs, regulatory authorities may require expensive online TOC analysers, which use significant reagents and add cost.

By installing an MS4000-S VOC analyser at the effluent, you are notified as soon as VOC levels start to increase, allowing timely action and avoiding issues associated with unexpected pollution events.

Sewage System Monitoring

Hydrocarbons in sewage lines pose risks to maintenance personnel and can contaminate sludge in treatment plants.

Sludge may become contaminated due to defective oil separators, accidental spills, or illegal dumping.

Once sludge contains hydrocarbons, it must be treated as chemical waste rather than fertiliser, significantly increasing disposal costs.

Using the MS4000-S VOC gas analyser allows detection of peaks in VOC concentrations in sewage systems, enabling appropriate action and optimisation of the treatment process.

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PARAMETER OPERATIONAL REQUIREMENTS NOTES
Minimum Maximum
Detection Range 1 ppm 3000 ppm Total VOCs
4–20 mA Range (Default) 0 ppm 3000 ppm Configurable on commissioning
Repeatability -5% +5% Measured against a 100 ppm toluene standard at standard temperature and pressure; accuracy can be further improved at concentrations of interest using bespoke calibration available on request.
Accuracy -15% +15%
Measurement Frequency Continuous
Ambient Temperature 0 °C / 32 °F 50 °C / 122 °F Climate control may be required depending on process and ambient conditions
Relative Humidity of Sample 90% Non-condensing
Analog Input 4 mA 20 mA Scalable to required range; max load 750 Ω, loop-powered or instrument-powered
Analog Output 4 mA 20 mA
Analog Output Isolation 5 kVAC, 400 VDC
Relay Current 5 A Max. 250 VAC or 30 VDC; 3x relays: Alarm 1, 2 and Fault with NO and NC contacts
Interface Touchscreen With advanced reporting capabilities
Communication Protocols Modbus (Optional) Profibus / HART / Foundation Fieldbus available on request
Data Storage μSD Card / Windows PC 6 months
Instrument Case IP65 Powder-coated stainless steel; Power Supply Module IP68
Instrument Weight 15 kg / 33 lbs
System Dimensions 45 × 28 × 20 cm
17.72 × 11.02 × 7.87 in
Supply Voltage 90 V AC
9 V DC		 240 V AC
36 V DC		 50 Hz or 60 Hz
Power Consumption 45 W Typically 20 W during operation
Consumables 6 months: Filters and restrictors

View Datasheet

Title Type Format
MS4000-S – VOC in Gas Analyser Datasheet PDF
What does the MS4000-S VOC Gas Analyser actually measure?
The MS4000-S measures the concentration of VOC gases against a target gas standard (usually toluene), including a wide range of hydrocarbons in industrial applications.
How often does the instrument provide a reading?
The instrument provides continuous readings via the 4–20 mA output, allowing for real-time monitoring.
What is the reported value?
The reported value is total VOCs, in ppm, in the range from 0 to 3000 ppm.
What is the principle of operation?
The system continuously samples the air above effluent or sewage; this air is passed through sensors which react with VOCs to measure their concentration. Results are reported via the analogue output.
How is the MS4000-S calibrated?
The instrument is factory-calibrated against toluene standards, with bespoke calibration available for specific target gases if required.
What are common target gases?
Petroleum gas, methane, iso-butane, kerosene, ethanol, diesel, iso-butylene, toluene, acetone, xylene, heptane, benzene, methanol, mercaptan, and other industrial hydrocarbons and solvents.
What maintenance is required? Is it expensive?
The instrument requires servicing every six months to replace low-cost components such as activated carbon filters and to ensure there are no air leaks. Maintenance is straightforward and inexpensive.
What is the warranty?
Each instrument comes with a one-year warranty from the date of shipment.
How does the MS4000-S alert the user to high gas concentrations?
The MS4000-S incorporates a relay that switches at a user-definable threshold. This can be hardwired to valves, pumps, or other equipment to stop processes quickly. Alternatively, the user’s SCADA system can also be used for monitoring and control.