---
title: Ground Gas & Contaminated Land Monitoring | Shawcity
description: Discover monitoring solutions for ground gas and contaminated land including methane and carbon dioxide detection.
---
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# Ground Gas and Contaminated Land
### **FAQs**
##### Which instruments should be used to monitor biogas?
The Gas Data GFM430 can be used for measuring the individual components of biogas (CH4, CO2, H2S and O2) concentration, as well as temperature. A dedicated biogas analyser, the GFM416 is available to hire or buy.
##### What instruments are available for ground-gas monitoring?
Ground-gas/landfill monitors are available in both portable and in-borehole versions. For 'spot' surveys there is the portable Gas Data GFM430/5/6 and for long-term 'in situ' borehole monitoring there is the Ion Science Gasclam.
##### What are the advantages of the portable landfill gas monitor?
The GFM436 portable landfill gas monitor is hand-held and lightweight. Also, monitoring of several boreholes is possible during one site visit.
##### What does the GasClam in-borehole landfill gas instrument measure?
The Gasclam measures gas (CH4, CO2, VOCs, H2S, CO, O2), concentrations, temperature and borehole and atmospheric pressures.
##### What is the battery life on the GasClam in-situ borehole monitor?
Measurements can be taken at user-defined intervals. The default setting for the GasClam is to sample every hour and upload data every six hours providing up to two months battery life (with rechargeable D-cell batteries).
##### What is the start-up time for the GasClam in-situ borehole monitor?
After the GasClam has been physically installed in the ground it can start collecting data in less than 2 minutes. The GasClam will continuously collect data at intervals set by the user.
##### What gases does the GFM 436 detect?
The GFM 436 Landfill Monitor measures six gases: methane, carbon dioxide, oxygen, carbon monoxide, hexane.
##### How often should my GFM 436 instrument be serviced?
We advise that instruments are returned every 12 months so that they can be serviced/ maintained for optimum operational use.
##### What does the GFM portable landfill gas instrument measure?
The GFM430/5/6 measures gas (CH4, CO2, H2S, CO), concentrations, temperature and borehole, atmospheric pressures plus borehole flow.
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