Sensor Electronics offers a new fail-safe ammonia detector designed for commercial/industrial/institutional refrigeration. Besides checking for ammonia leaks, this new detector continually checks itself, flashing an immediate alarm the instant its sensing cell fails. Detectors team with dedicated transmitters that show ammonia levels on digital readout panels. Color-coded LED’s glow green/amber/red if ammonia concentrations increase. Sensor Electronics,, (800) 285-3651. Circle 264 Ammonia detector