GM25-4 Ground Gas Monitor
The GM25-4 is a gas analyser for site investigation, landfill gas control, and environmental regulation compliance monitoring.
The GM25-4 portable gas analyser makes all work steps as easy as possible for you. It is a fixed configuration, measuring the proportions of gases presented in greenfield and brownfield sites, as well as land affected by landfill operations or other contamination. Operation is extremely simple, yet the readings obtained are comprehensive and accurate.
Features
The GM25-4 is an ATEX, IECEx and UKEx rated instrument designed to measure gas, pressure, and high flow rates. The GM25-4 is deployed for environmental compliance monitoring, brownfield contamination monitoring, and landfill gas control.
What is the difference between the GM25-4 and GM25-3?
Both instruments are designed to measure landfill gas, pressures, and flow rates. The key difference is the flow capacity of the instrument. Both measure the key gas components of CH4, CO2, O2, H2S and CO, both measure Atmospheric and Differential Pressure, and both have data logging and recording functionality.
The GM25-4 measures flow rate in litres per hour (I/hr), using an electrical component within the instrument. By comparison, the GM25-3 will calculate flow using differential pressure, measuring difference in pressure between 2 spots either side of an orifice plate within an extraction system. The calculation shows flow rate in normal meters cubed per hour (Nm3/hr). Fore more in-depth comparisons, please view our GM25 comparison chart.
General Specifications
- Ex. Rating: EEx ib IIB T1
- 6 gas analysis channels (CH4, CO2, O2, H2S, CO, HEX)
- PID correction factor for low levels of VOC
- Measure atmospheric, static, and differential pressures
- Bidirectional measurement of instantaneous and peak borehole flow
- Simple reporting – via Instrument Connect Software or DataField GM25 Connect app
- Small portable design – easily fits in one hand
- 12-month service interval
- High-contrast LCD display
- User-swappable battery pack
- Battery life ranging from 8 to 12 hours and 4 hours charging time
- Charger suited to client’s country
- Protective, weather-proof neoprene case
- Optional extra of vane anemometer to measure gas velocity of 0.5 – 40m/s
- Optional extra brass probe to measure gas temperature
- All GM25 instruments require annual service and recalibration and service