Biogas Methane, Carbon Dioxide and Humidity Multigas Probe MGP261 Biogas Methane, Carbon Dioxide and Humidity Multigas Probe MGP261
Biogas Methane, Carbon Dioxide and Humidity Multigas Probe MGP261
Biogas Methane, Carbon Dioxide and Humidity Multigas Probe MGP261
Biogas Methane, Carbon Dioxide and Humidity Multigas Probe MGP261
Biogas Methane, Carbon Dioxide and Humidity Multigas Probe MGP261
Biogas Methane, Carbon Dioxide and Humidity Multigas Probe MGP261

Vaisala MGP261 Biogas Methane, Carbon Dioxide and Humidity Probe

Vaisala MGP261 Biogas Multigas Probe

The Vaisala MGP261 measures methane, carbon dioxide and humidity directly in raw biogas. Its in-situ design avoids a separate sampling system and helps operators monitor gas quality while protecting downstream equipment.

  • Measures CH4, CO2 and water vapour in one probe
  • 0–100 vol-% measurement range for methane and carbon dioxide
  • Humidity output as 0–25 vol-% H2O or −10 to +60 °C dew point
  • Heated optics help prevent condensation in wet biogas
  • Three isolated 4–20 mA outputs and RS-485 Modbus RTU
  • Ex-certified construction for direct installation in hazardous process areas

Ask Seacom about the MGP261

In-Situ Measurement for Raw Biogas

The Vaisala CARBOCAP® MGP261 is designed for direct measurement in raw biogas from anaerobic digestion, wastewater treatment, landfill-gas collection and related processes. It combines methane, carbon dioxide and humidity measurement in one compact instrument, giving plant operators a clearer view of gas composition without drawing the sample through external conditioning equipment.

Continuous gas-quality data can support digester control, help operators assess energy value and identify moisture conditions that may affect piping, filters or combined heat and power equipment. The probe's heated optical system is intended for wet process conditions where condensation would otherwise interfere with measurement.

Process measurement, not a gas-leak alarm

The MGP261 is an in-line process analyser for biogas composition. It is not an ambient combustible-gas detector or a personnel-safety alarm. For room or plant-area gas detection, use a dedicated fixed gas-detection system selected for the applicable safety standard.

Measured Parameters

ParameterMeasurement rangeTypical purpose
Methane, CH4 0–100 vol-% Biogas concentration, process performance and energy-value monitoring
Carbon dioxide, CO2 0–100 vol-% Gas-composition balance and digestion-process monitoring
Water vapour, H2O 0–25 vol-% Moisture loading and condensation-risk assessment
Dew point −10 to +60 °C Td Humidity expressed as a process dew-point temperature

Measurement Performance

ParameterAccuracy at +25 °C and 1013 hPaRepeatability
CH4 ±2 vol-% at 0–40%; ±1 vol-% at 40–70%; ±2 vol-% at 70–100% ±0.5 vol-% at 60 vol-%
CO2 ±2 vol-% at 0–30%; ±1 vol-% at 30–50%; ±2 vol-% at 50–100% ±0.3 vol-% at 40 vol-%
H2O ±0.5 vol-% ±0.1 vol-% at 2.5 vol-%
Response and start-up 30-second start-up, approximately 2-minute warm-up and 90-second T90 with the standard PTFE filter

Published accuracy is specified under defined reference conditions and excludes cross-gas interference. Process pressure and temperature compensation should be configured correctly for the installation.

Outputs and System Integration

Power supply 18–30 VDC; typical consumption 3 W, maximum 6 W
Analogue outputs Three isolated, scalable 4–20 mA channels; maximum load 500 Ω
Digital communication RS-485 with Modbus RTU
External compensation input Optional intrinsically safe 4–20 mA input for an external pressure or temperature sensor
Configuration Local service interface and Vaisala Insight software for setup, diagnostics and maintenance

Operating and Mechanical Details

Process temperature 0 to +60 °C
Ambient temperature −40 to +60 °C
Process operating pressure −500 to +500 hPa
Process flow 0–20 m/s
Process connection 1.5-inch male NPT
Mechanical pressure tolerance 20 bar(g); this is not the permitted measurement operating-pressure range
Ingress protection IP66
Wetted and body materials AISI 316L stainless steel, PPS and sintered PTFE filter
Weight Approximately 3 kg

Vaisala MGP261 or MGP262?

ProbeBest suited toMeasured parametersKey distinction
MGP261 Raw biogas production and CHP feed-gas monitoring CH4 0–100%, CO2 0–100%, H2O 0–25% or dew point Three-in-one gas-quality measurement including moisture
Vaisala MGP262 Biomethane-upgrading offgas and methane-slip monitoring CH4 0–5%, CO2 0–100% Lower methane range for detecting and controlling methane losses in CO2-rich offgas

Choose the MGP261 when humidity is part of the measurement requirement or when methane may span the full raw-biogas range. Choose the MGP262 when the primary task is measuring low methane concentration in biomethane-upgrading offgas.

Installation Options

ArrangementWhen it fitsPlanning point
Direct in-situ installation Continuous measurement directly in a suitable biogas line Confirm the 1.5-inch NPT connection, process pressure, insertion location and maintenance access
Ball-valve installation Applications that require probe isolation and removal according to the approved installation arrangement Review valve dimensions, clearance and hazardous-area work procedures before installation
Flow-through adapter Bypass or sample-flow measurement where direct insertion is unsuitable Recommended flow is 0.5–1 L/min; maintain representative pressure and temperature conditions

Typical Applications

  • Anaerobic digestion at wastewater-treatment plants
  • Municipal and industrial organic-waste digestion
  • Landfill-gas collection and utilisation
  • Biogas quality monitoring before a CHP engine
  • Activated-carbon filter monitoring
  • Process optimisation where methane yield, carbon dioxide and moisture must be tracked together

Hazardous-Area Planning

The MGP261 is available with hazardous-area certifications that support a probe section in Zone 0 and an external section in Zone 1 under the specified installation conditions. Certification markings and permitted ambient conditions vary by region and product version. The final selection must be checked against the applicable certificate, control drawing, cable-entry method, power arrangement and local hazardous-area requirements.

Vaisala MGP261 Supplier and Technical Support in Malaysia

Seacom Process Instruments supplies and supports the Vaisala MGP261 Biogas Multigas Probe in Malaysia. Our team can help review the measurement range, process connection, hazardous-area requirement, installation arrangement, analogue and Modbus integration, commissioning and maintenance planning.

Send us your biogas composition, process pressure and temperature, pipe details, Ex classification and required outputs. We will help you check whether the MGP261, MGP262 or another measurement arrangement is the better fit.

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  MGP261 Catalogue   (194.32k)

  MGP261 Order Form   (247.88k)


Specific References

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