natural gas sensors carbon dioxide sensor gas sensors NATURAL GAS SENSORS Acme has a continuous research and development program dedicated to selecting the best possible sensing technology and applying it to the HVAC marketplace. Acme’s natural gas sensors must offer a long life, stable performance, easy field calibration and when required, quick replacement. In order to protect the natural gas sensors from damage and vandalism during construction period, the enclosure only, without its cover, shall be wall mounted. Install unit cover incorporating the circuit board and sensor only after construction has been completed and space is clean. Secure cover to enclosure using the vandal-proof screws included with the cover.