MGP261 VAISALA | Alldatasheet

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Technical content

Features

  • Compact in situ probe with CH 4, CO2, and H2O vapor 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 CARBOCAPâ 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). The probe belongs to the Vaisala MGP260 series product family. 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 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 CARBOCAPâ 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). 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).

Property Methane CH 4 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 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 (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) 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) 1) 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 1) See product documentation for full Ex classifications for each region. Operating environment Operating humidity range 0–100 %RH Storage humidity range 0–90 %RH Process pressure range −500 ... +500 hPa 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 × M16×1.5 2 × M20×1.5 IP rating IP66 Materials Probe body AISI316L stainless steel, PPS Filter cap Sintered PTFE Options and accessories Configuration cable (RS-485/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 Ø 32 [1.26] mm [in] NPT 1 .5” (MALE) 403 [15.87] Ø 34 [1.34] 30 [1.18] [1.85] 16.5 [0.65] Ø 94 [3.7] 28 [1.1] 155 [6.1] 414 [16.3] 248 [9.76] WRENCH 50 [1.97] ALLEN 5 [3/16] MGP261 dimensions Published by Vaisala | B211728EN-F © Vaisala 2023 All rights reserved. Any logos and/or product names are trademarks of Vaisala or its individual partners. Any reproduction, transfer, distribution or storage of information contained in this document is strictly prohibited. All specifications — technical included — are subject to change without notice. www.vaisala.com