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.
DataField GM25 Connect
The GM25 series can be used by itself or in combination with the DataField GM25 Connect app which allows the GM25 analyser to be controlled via a mobile device or tablet. This results in faster operations whilst being able to configure how readings are taken suiting the individual users needs.
Find out more about DataField GM25 Connect in the software tab!
- Site investigation
- Borehole monitoring
- Compliance Monitoring
- Landfill Gas Control
The GM25 series can be used by itself or in combination with the DataField GM25 Connect app which allows the GM25 analyser to be controlled via a mobile device or tablet.
This results in faster operations whilst being able to configure how readings are taken suiting the individual users needs. If an internet connection is present, the application can live-stream the data to the web-based portal as opposed to downloading it directly from the device after all readings have been taken, resulting in much faster access to the gas analysis data.
To download the DataField GM25 Connect software, please complete the Software Download form.
- Factory calibrated infrared sensor for measuring Hexane vapour
- PID correction factor for low levels of VOC
- Bidirectional measurement of instantaneous and peak borehole flow
- Storage of 2 water level readings from dipmeter taken at each borehole
- Manual data storage and programmable unattended data logging functions
- 6 gas analysis channels
- Measures atmospheric, static and differential pressures
- Simple reporting – via DataField GM25 Connect app
- Small portable design – easy to hold in one hand
- 12-month service interval
Downloads
Product FAQs
- What is a GM25-4?
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 us the difference between the GM25-3 and GM25-4?
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 GM25-4 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.
- How do I order my GM25-4?
Before enquiring about the GM25-4, please do take a look at the instrument datasheet to ensure the product is fit for purpose.
If you have any further queries, reach out to your distributor or the manufacturer for support. Orders can be placed through Gas Data’s distribution partners. Please do make clear the model you are enquiring about from the start.
- How do I carry out monitoring with a GM25-4?
When purchased, you will receive the following with the GM25-4:
- Instrument
- Sample Pipe
- Battery Charger
- Spares Pot
- Allen Key
- USB drive with operation manual
This is referred to as the “ready-to-go site kit”. All instruments are shipped fully charged and are able to be deployed upon arrival with little to no set-up required.
The sample pipe provided is ~1m in length and includes a dust trap filter to prevent particulates from entering the sensor and causing damage. The male connector will attach to the inlet manifold of the instrument, and, on the opposite end, the silicon 1/4” tube will connect to most industry-standard sampling points. For in-depth instructions on how to operate the instrument, please view the manual file stored on the received USB drive.
- What is the lead time on a GM25-4?
The GM25-4 is built to order. Instrument lead times can range between 2-14 weeks.
- How often does my GM25-4 require servicing?
The GM25-4 requires an annual service and calibration. Please contact your supplier to organise servicing in good time prior to the calibration date – this is shown on the latest calibration certificate and on the home screen of the instrument.
- How do I book a service?
It is highly recommended to book a service in advance of the instrument’s calibration date. Reach out to the distribution partner you have purchased the instrument from to receive a service slot. Servicing typically takes 10-15 working days, with collection and reshipment being included in the service cost.
- How do I order spares/consumables for my GM25-4?
Identify the part you require and contact the distribution partner from whom you purchased the analyser. Alternatively, visit the Gas Data website and fill in the enquiry form associated with consumables and spares.
- Where can I use the GM25-4?
The GM25-4 can be configured to whichever gases you require from the list of available sensors (please refer to datasheet for these). From there, the instrument’s ATEX rating means it can be used in Zone 1 areas. The full certification is: EEx ib IIB T1.
Please review your risk assessments to ensure that the instrument has the correct certification for use in your application.