Solid Waste & Recycling

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Landfill methane detector


The LANDTEC SEM5000 methane (CH4) detector.

Dexter, MI – Q.E.D. Environmental Systems, Inc., has released the new LANDTEC SEM5000 methane (CH4) detector, for landfill surface emissions monitoring (SEM).

The SEM5000 meets or exceeds U.S. Environmental Protection Agency Method 21 – Determination of Volatile Organic Compound Leaks requirements for quarterly SEM monitoring. The SEM5000 uses patented laser technology with a frequency dialed specifically to methane – so readings are not affected by cross-gassing.

The SEM5000 is lightweight and ergonomically designed.

Unlike flame ionization devices (FIDs), the SEM5000 uses laser technology, so there is no cross-gas effect or false readings due to the presence of other gases or hydrocarbons as with FIDs. No flame is required, a huge benefit for sampling in a potentially explosive environment. No external gas bottle is required for operation, and the technology is accurate down to 0.7 parts per million (ppm). In addition, the laser technology eliminates the risk of “flame out”, so the user doesn’t lose time stopping and relighting.

The device features an integral GPS. Readings can be saved directly to a desktop computer using the SEMsoft software package, which features multiple reporting functions and choices, easy upload for site maps and scan paths, and customizable indicator points based on the scan. What’s more, the software can autofill data directly to most standard forms required. The unit includes a “Hot Swap” removable and rechargeable battery, so the user can swap the dead battery with a fully charged one and keep working.

The SEM5000 weighs half as much as other technologies. The carrying case and harness allows for hands-free operation and the LED alarm lights provide notification in the noisiest conditions.


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