Home / All / Biogas Upgrading System / Vaisala MGP261 Biogas Monitor Methane CO2 Humidity 3-in-1 Biogas Probe In Situ Biogas Measurement
Vaisala MGP261 Biogas Monitor Methane CO2 Humidity 3-in-1 Biogas Probe In Situ Biogas Measurement
Detail Information
Vaisala MGP261 3-in-1 Multigas Probe
For methane, carbon dioxide, and humidity
measurement
Features
• Compact in situ probe with CH4, CO2 and H2O measurement
• Excellent long-term stability and repeatability with proprietary infrared technology — no calibration gases needed
• Direct installation into 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
Vaisala CARBOCAP® MGP262 MGP261 Multigas Probe for Methane, Carbon Dioxide, and Humidity Measurement is designed for in situ measurements in demanding biogas processing conditions where repeatable, stable, and accurate measurement is essential. MGP261 is Ex-certified for use in Ex Zone 0 (parts inserted into process) and Ex Zone 1 (parts outside the process).
Up to three measurements in one compact unit
MGP261 measures the main components of biogas and landfill gas: methane (CH4), carbon dioxide (CO2), and humidity. These gases make up the bulk of biogas, and measuring all three parameters gives you a 100% picture of the process. MGP261 measures CH4, CO2, and humidity in vol-% units, oralternatively dewpoint temperature (Td) in degrees Celsius.
Methane measurement for biogas quality and process control
Methane concentration measurement tells you the calorific value of the gas produced in real time. With internal temperature measurement for compensation purposes and an option for external pressure or temperature compensation input, the patented CARBOCAP® measurement gives unparalleled stability and reliability without calibration gases. Application areas include anaerobic digestion and landfill gas monitoring, activated carbon filter monitoring in biogas treatment process, and CHP engine feed gas monitoring.
Direct in situ measurement without sample treatment
MGP261 measures gases directly in the process pipeline without a need for moisture removal. This simplifies the measurement both in situ and as part of an extractive system with optional flow through cell accessory. The heated optical elements provide reliable measurements even in most demanding process conditions with condensate in the process gas.
MGP261 is Ex-certified for use in Ex Zone 0 (parts inserted into process) and Ex Zone 1 (parts outside the process).
Measurement Performance
Property | Methane CH4 | Carbon dioxide CO2 | Water vapor H2O |
Sensor | CARBOCAP® | CARBOCAP® | CARBOCAP® |
Measurement unit | Volume-% | Volume-% | Volume-%, dewpoint °C |
Measurement range | 0–100 vol-% | 0–100 vol-% | 0–25 vol-%,
−10 … +60 °C
(14 … +140 °F) |
Accuracy at+25 °C (+77 °F) and 1013 hPa 1) 2) | • 0–40 vol-%:
±2 vol-%
• 40–70 vol-%:
±1 vol-%
• 70–100 vol-%:
±2 vol-% | • 0–30 vol-%:
±2 vol-%
• 30–50 vol-%:
±1 vol-%
• 50–100 vol-%:
±2 vol-% | 0–25 vol-%:
±0.5 vol-% |
Repeatability 2) | ±0.5 vol-% at
60 vol-% | ±0.3 vol-% at
40 vol-% | ±0.1 vol-% at
2.5 vol-% |
Temperature
dependence,
compensated | Compensated, 0–
100 vol-%:
±0.1 % of
reading/°C | Compensated, 0–
100 vol-%:
±0.1 % of
reading/°C | Compensated,
0–25 vol-%:
±0.1 % of
reading/°C |
Temperature
dependence,
uncompensated | Uncompensated,
0–100 vol-%:
-0.9 % of reading/°C | Uncompensated,
0–100 vol-%:
-0.9 % of reading/°C | Uncompensated,
0–25 vol-%:
-0.4 % of reading/°C |
Pressure
dependence,
compensated | Compensated, 0–
100 vol-%:
±0.015 % of reading/hPa | Compensated, 0–
100 vol-%:
±0.01 % of reading/hPa | Compensated,
0–25 vol-%:
±0.06 % of reading/hPa |
Pressure
dependence,
uncompensated | Uncompensated,
0–100 vol-%:
+0.2 % of reading/hPa | Uncompensated,
0–100 vol-%:
+0.2 % of reading/hPa | Uncompensated,
0–25 vol-%:
+0.2 % of reading/hPa |
Long-term stability | ±2 vol-%/year | ±2 vol-%/year | ±2 vol-%/year |
Start-up time 3) | 30 s | ||
Warm-up time 4) | 2 min 5) | ||
Response time (T90) | 90 s 6) | ||
Response time with flow through adapter | 90 s at ≥ 0.5 l/min 6) (recommended: 0.5–1 l/min) | ||
1) Excluding cross-interferences to other gases.
2) Accuracy specification at 25 °C (+77 °F) and 1013 hPa including non-linearity, calibration uncertainty, and repeatability; temperature and pressure compensated.
3) Time to first reading.
4) Time to specified accuracy.
5) At +20 °C (+68 °F) ambient temperature.
6) With standard PTFE filter.
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.
Compliance
Electromagnetic compatibility (EMC) | EN 61326‑1, industrial environment |
Compliance marks | CE, China RoHS, RCM |
Ex approval marks | EU (ATEX), international (IECEx),
US/CAN (cMETus), Japan (CML), UK (UKEX), Korea (KCs) |
Ex classification | Ex II 1/2 (1) G Ex eb mb [ia] IIB T3
Ga/Gb -40 °C ≤ Tamb ≤ +60 °C |
Class I, Division 2, Groups C, D; T3 |
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 hPa |
Process temperature range | +0 ... +60 °C (+32 ... +140 °F) |
Process flow range | 0–20 m/s |
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 |
Materials | |
Probe body | AISI316L stainless steel, PPS |
Filter cap | Sintered PTFE |
Options and accessories
| Configuration cable (RS485/USB) | 257295 |
| Flow-through adapter | 258877 |
| Sintered PTFE filter (includes O-ring) | DRW249919SP |
| NPT 1.5" thread test plug | 257525SP |
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