Vaisala MGP262 Multigas Probe For Low Concentration Methane & High Concentration CO2 Measurement


  • Compact in situ probes with low-% CH4 and high-% CO2 measurement
  • Superior long-term stability and repeatability with proprietary infrared technology — no calibration gases needed
  • Direct installation into the process: no sample treatment needed
  • Certified for Ex Zone 0/1
  • Probe heating eliminates condensation in wet processes
  • Corrosion-resistant stainless steel housing (IP66)
  • Standalone probe with digital Modbus RTU over RS-485 or 3 analog outputs (4 … 20 mA)
  • Compatible with Vaisala Insight PC software

Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala CARBOCAP® MGP262 Multigas Probe for Methane and Carbon Dioxide Measurement is designed for demanding in situ measurement of the off€gas in the biogas upgrading process, where low concentrations of methane need to be measured reliably and with high accuracy in the presence of high concentrations of carbon dioxide. The probe belongs to the Vaisala MGP260 Series product family.

Direct View To Process Performance

MGP262 measures the concentrations of the main components in the o„gas stream of a biogas upgrading process: methane and carbon dioxide. The methane concentration in the o„gas is one of the direct indicators of the process performance. The lower the offgas methane concentration, the lower the methane loss, hence higher yield from the biogas and the smaller the environmental impact. Monitoring o„gas composition reliably and accurately
enables optimizing the upgrading the process as well as determining the amount of greenhouse gases emitted from the process for environmental compliance purposes.

Outstanding Methane Measurement Performance

MGP262 has been optimized for measuring methane concentrations below 5 vol-% with an accuracy of ±0.15 vol-%. Combined with a wide temperature range (-40 °C to +60 °C), MGP262 is ideal for a wide range of upgrading technologies and processes.

Ease Of Use

MGP262 is unique in being an in situ probes for demanding explosive environments. No sampling system is needed and there are no moving parts in the probe. Apart from an annual calibration check, MGP262 does not need any consumables or calibration gas cylinders, which makes its maintenance
very easy.

Robust, Weatherproof, and Ex Certified For Zones 0 and 1

MGP262 is internationally certified for Zone 0 inside the pipeline and Zone 1 on the outside, allowing installation in any Ex hazardous environment expected in the biogas and natural gas industry. The probe is IP66 rated and specified for ambient temperatures from -40 °C to +60°C for outdoor installation in harsh environments. Stainless steel construction, hermetic sealing of optics, and encapsulated electronics provide the probe with maximum robustness and resilience to mechanical shocks, vibration, and corrosive chemicals.



Measurement Performance
Property Methane CH4 Carbon dioxide CO2
Measurement unit Volume-%
Measurement range  0 … 5 vol-% 0 … 100 vol-%
Accuracy specification at 25 °C (+77 °F) and 1013 mbar including nonlinearity, calibration uncertainty, and repeatability; temperature and pressure compensated 1)
Accuracy at +25 °C (+77 °F) and 1013 mbar 0 … 2 vol-%: ±0.1 vol-%CH4
2 … 5 vol-%: ±5% of reading
90 … 100 vol-%: ±1 vol-%
0 … 90 vol-%: ±2 vol-%
Repeatability < ±0.1 vol-% at 1% CH4 ±0.4 vol-% at 95 vol-%
Temperature dependence (typical) Compensated:
0 … 2 vol-%: ±0.05%CH4
2 … 5 vol-%: ±0.2%CH4
0 … 100 vol-%: ±0.4 vol-%
Uncompensated: ±0.7 % of reading / °C Uncompensated, 0 … 100 vol-%: ±0.1 % of reading / °C
Pressure dependence (typical) Compensated:
0 … 2 vol-%: ±0.05%CH4
2 … 5 vol-%: ±0.1%CH4
0 … 100 vol-%: ±1 vol-%CO2
Uncompensated: ±0.2 % of reading / mbar Uncompensated, 0 … 100 vol-%: ±0.15 % of reading / mbar
Long-term stability  0 … 2 vol-%: ±0.1 vol-%CH4 / year
2 … 5 vol-%: ±5% of reading / year
±2 vol-%/year
Start-up time 2) 30 s
Warm-up time 3) 2 min 4)
Response time (T90) 90 s 5)
Response time with flowthrough adapter 90 s at ≥ 0.5 l/min 5)
(recommended: 0.5 … 1 l/min)
1) Excluding cross-interferences to other gases.
2) Time to first reading.
3) Time to specified accuracy.
4) At +20 °C (+68 °F) ambient temperature.
5) With standard PTFE filter.
Operating environment
Operating temperature range -40 … +60 °C (-40 … +140 °F)
Operating humidity range 0 … 100 %RH
Storage temperature range -40 … +60 °C (-40 … +140 °F)
Storage humidity range 0 … 90 %RH
Process pressure range -500 … +500 mbar(g)
Process temperature range +0 … +60 °C (+32 … +140 °F)
Process flow range 0 … 20 m/s
EMC compatibility IEC / EN / BS EN 61326‑1, industrial environment
Compliance marks CE, China RoHS, RCM, WEEE
Ex approval marks ATEX (Europe), IECEx (international),
cMETus (USA and Canada), CML
(Japan) 1)
IECEx Ex classification Ex II 1/2 (1) G Ex eb mb [ia] IIB T3 Ga/Gb -40 °C ≤ Tamb ≤ +60 °C
1) See product documentation for full Ex classifications for each region
Inputs and Outputs
Operating voltage 18 … 30 V DC
Power consumption Typical: 3 W
Maximum: 6 W
Digital output RS-485 (Modbus RTU)
Analog output 3 × 4 – 20 mA scalable, isolated
Analog output load Minimum: 0 Ω
Maximum: 500 Ω
Analog output accuracy ±0.2 % of full scale at 25 °C (77 °F)
Analog output temperature dependence 0.005 %/˚C (0.003 %/°F) full scale
Analog input (recommended) 1 × 4 – 20 mA (Ex ia) for external
pressure or temperature sensor 1)
1) The optional analog input is galvanically isolated and provides power for the connected external pressure sensor.
Mechanical Specification
Weight 3 kg (6.6 lb)
Thread type 1.5″ male NPT
Mechanical pressure tolerance 20 bar(g)
Cable lead-throughs 1 × M16x1.5
2 × M20x1.5
IP rating IP66
Probe body AISI316L stainless steel, PPS
Filter cap Sintered PTFE
Options and Accessories
Configuration cable (RS485/USB) 1) 257295
Flow-through adapter 258877
Sintered PTFE filter (includes O-ring) DRW249919SP
MGP260 Series Ex e connector set 265897
NPT 1.5″ thread test plug 257525SP
1) Vaisala Insight software for Windowsâ available at


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