Vaisala MGP261 Multigas Probe For Methane, CO2, & Humidity Measurement

Features

  • Compact in situ probes with CH4, CO2, and H2O vapor 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
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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® 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 the 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, or alternatively dewpoint temperature (Td) in °C.

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 CARBOCAPâ measurement gives unparalleled stability and reliability without calibration gases. Application areas include anaerobic digestion and landfill gas monitoring activated carbon filter monitoring in the biogas treatment process, and CHP engine feed gas monitoring.

Direct In Situ Measurement Without Sample Treatment

MGP261 measures gases directly in the processing pipeline without a need for moisture removal. This simplifies the measurement both in situ and as part of an extractive system with an optional flow through cell accessory. The heated optical elements provide reliable measurements even in the most demanding process conditions with condensate in the process gas.

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

MGP261 is Ex certified for use in Ex Zone 0 (parts inserted into the process) and Ex Zone 1 (parts outside the process). The electronics and optics of the IP66-rated instrument are protected by encapsulation in a potting compound to ensure maximum resistance to weather, dust, and ingress of process gases in the probe. Materials exposed to process gas are carefully selected for good chemical resistance against hydrogen sulfide: they include stainless 316L steel and polytetrafluoroethylene (PTFE).

Dimension

Specification

Measurement Performance
Property Methane CH4 Carbon dioxide CO2 Water vapor H2O
Sensor CARBOCAPâ CARBOCAPâ CARBOCAPâ
Measurement unit Volume-% Volume-% Volume-%, dew point °C
Measurement range 0 … 100 vol-% 0 … 100 vol-% 0 … 25 vol-%, -10 … +60 °C (14 … +140 °F)
Accuracy specification at 25 °C (+77 °F) and 1013 mbar including nonlinearity, calibration uncertainty, and repeatability; temperature and pressure compensated
Accuracy at +25 °C (+77 °F) and 1013 mbar 1) • 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 ±0.5 vol-% at 60 vol-% ±0.3 vol-% at 40 vol-% ±0.1 vol-% at 10 vol-%
Temperature dependence 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
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, 0 … 100 vol-%: ±0.015 % of reading/mbar Compensated, 0 … 100 vol-%: ±0.01 % of reading/mbar Compensated, 0 … 25 vol-%: ±0.06 % of reading/mbar
Uncompensated, 0 … 100 vol-%: +0.2 % of reading/ mbar Uncompensated, 0 … 100 vol-%: +0.2 % of reading/ mbar Uncompensated, 0 … 25 vol-%: +0.2 % of reading/mbar
Long-term stability ±2 vol-%/year ±2 vol-%/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 flow-through 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
Inputs and Outputs
Operating voltage 18 … 30 VDC
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 (optional) 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) EN61326-1, Industrial environment
Ex classification Ex II 1/2 (1) G Ex eb mb [ia] IIB T3 Ga/Gb -40 °C ≤ Tamb ≤ +60 °C
IP rating IP66
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
Mechanical Specification
Weight 3 kg (6.6 lb)
Thread type 1.5″ male NPT
Cable lead-throughs 1 x M16x1.5
2 x M20x1.5
Materials
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
NPT 1.5″ thread test plug 257525SP
1) Vaisala Insight software for Windowsâ available at www.vaisala.com/insight

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