ME100 Methane Ebullition Intelligent Device

The ME100 Methane Ebullition Intelligent Device is designed for the observation of CH₄ bubbling fluxes at the water-gas interface in aquatic ecosystems. Numerous studies have reported that methane bubbling fluxes in aquatic ecosystems account for up to 99 % of the total methane flux. The traditional manual inverted funnel method does not allow for high temporal resolution of CH₄ bubbling concentration and volume changes in real time, and requires a lot of manpower to collect the gas manually. We have therefore developed an intelligent methane bubbling flux observation device based on the inverted funnel method, which is based on the principle of the inverted funnel method. The device allows for high temporal resolution observation of CH₄ bubbling concentration and volume changes and is unattended, thus enabling accurate assessment of CH₄ fluxes at the water-gas interface in aqueous ecosystems.

Features

• High frequency observations
•  Unattended all-weather observatio
•  Remote control
• Real-time data transmission in the cloud
•  Small size and high portability
• High temporal resolution observation of CH₄ bubble flux
• High temporal resolution capture of CH₄ bubble volume
• Real-time data transfer in the cloud

Calculation of CH₄ bubbling flux

Methane Ebullition Flux= *1000

• Methane Ebullition Flux is CH4 bubbling flux (nmol·m^-2·d^-1)
•  C is CH₄ concentration (ppm)
• A is the area of inverted funnel bottom (m²), diameter: 40 cm, area: 0.1256 m²
•  △T is the measurement interval (d)
• V1 is the headspace volume of inverted funnel (m3), diameter: 5.4 cm, height: 10 cm, volume: 0.000229 m³
•  Molar volume of ideal gas at 273 K Vm: 22.4 * 10^-3 m³/mol
• T1 is the standard temperature (K): 273 K
•  T2 is the measured air temperature (K), which is taken as the average temperature in t2
•  P1 is the standard atmospheric pressure (kpa): 101.325 kpa
•  P2 is the measured atmospheric pressure of air (kpa), and the temperature is taken as the average pressure in t2

Parameters

• CH₄ measurement principle: Non dispersive infrared technology (NDIR)
• CH₄ measurement range: 0-50 W ppm, ± 5% F.S (25 ℃)
• CH₄ measurement resolution: 1 ppm
• Resolution of CH4 bubbling volume measurement: 1 mL, ± 3% F.S
• Air temperature range: - 20~80
• Water temperature range: - 20~80 ℃
• Air pressure range: 0~200 kPa, ± 0.5% F.S
• Operating system: ME 100 control system
• Data transmission: DTU 4G remote transmission
• Host power: 8 W
• Power supply voltage: 24 V
• Battery capacity: 9000 mAh
• Solar power supply: 47 W
• Physical size: 800 * 800 * 300 mm

Device composition

• Host of intelligent methane bubbling flux observation device
• Solar panel
• Floating ring
• Anchor hook and anchor rope
• Anchor block
• User manual

Origin and Manufacturer：China Eco-mind