Phoenix Natural Gas Detection Systems for NGV's

Consisting of NGC Controller, NGC Sensor and/or NGS Hi-Temp Sensor

What They Do


Well suited for use on school buses, public transit buses and alternate fuel vehicles, the systems detect the presence of gas and provide visual and audible alarm. The systems consist of a natural gas controller (NGC) for either CNG or LNG in conventional or high-temperature versions, and up to three sensors (NGS and/or NGS-H), plus warning devices.

How They Work


Gas sensors (NGS 0r NGS-H) are mounted in areas where gas can accumulate (high in the engine compartment for natural gas and other lighter-than-air gas, low for propane or similar heavy gas). Sensors are calibrated to sound alarms at 15% LEL (lower explosive limit). Lights on the NGC indicate normal operation or the location of potential problems. Remote alarms indicate when gas is detected.

    NGS (Sensor) Features
  • compact, sturdy metal case for easy mounting
  • waterproof case design withstands road splash, washing
  • solid-state sensors have 10-year or mor life expectancy
  • high-temperature unit (NGS-H) rated up to 250º F
  • standard NGS mounts easily on frame or inside passenger compartment
    NGS (Controller) Features
  • 12 VDC unit powered from ignition switch circuitry
  • steel enclosure
  • 5 relays (N.O. rated at 0.5 amps) for up to 3 indicator lights, 1 alarm and 1 trouble light
  • built-in one-minute delay to minimize false alarms
  • system latches on--power must be interrupted (ignition turned off) to unlatch and stop alarm
  • internal lights indicate normal operation
  • warranted against defects in material or workmanship

Note: NGS cannot distinguish fuel fumes form similar fumes. Some sources of un-wanted alarms include sewer gases from drains or manhole covers, hydrogen gas from charging batteries, exhaust gases from a cold engine, propellants in aerosol spray cans, gasoline and cleaning solvents. The one-minute time delay should minimize un-wanted alarms, but some will occur.


Phoenix Energy Corp.     100 25th Street South     Birmingham, AL 35233     (205) 453-0241