Natural Gas Leak Detector

Any recommendations for a natural gas leak detector that would work with Konnected? For example, I stumbled on the Macurco GD-2A which seems promising, takes 12-24V in and has N.O. and N.C. contacts. The amperage seems low enough to run off the 12V output on the Konnected (I use PoE).

Has anyone ever used this or other wired natural gas detectors and can recommend a process for setting one up?