Ammonia Gas Monitor Single Zone

Ammonia Gas Monitor Single Zone

AGMSZ - Ammonia Gas Monitor Single Zone

The Bacharach AGMSZ (Ammonia Gas Monitor Single Zone) is designed for continuous single-point monitoring of ammonia gas. The AGMSZ displays the type of gas being monitored, along with displaying both the current gas level and the peak gas level detected on its front panel LCD. The instrument retains a log of previous readings that can be easily accessed for analysis.

An internal audible alarm and front panel indicators are provided to signal alarm and fault conditions, and relay contacts can be used to trigger external alarm devices in the event of a system fault, or if a leak (small), spill (medium), or evacuation (large) level of gas is detected. The system also includes a 4-20 mA current loop interface that can be connected to remote monitoring equipment.


  • Measures ammonia gas in the range of 25 to 10,000 ppm with a sensitivity of 1 ppm
  • Easily complies with ASHRAE 15 requirements with a low-cost investment
  • Eliminate false alarms with use of non-dispersive IR source and sample draw system
  • Monitors a single zone located up to 500 feet from unit
  • Logging feature enables 200 gas readings to be stored
  • Three gas alarm levels that can be individually set
  • Bolt-in, bolt-out internal components so the unit never leaves the wall
  • Two-year warranty


  • Gas Measured: Ammonia (NH3, also known as R-717)
  • Measuring Range: 25 to 10,000 ppm
  • Input: Dedicated single zone
  • Output Signals: 4 SPDT, 5 Amp, 240 VAC relays; digital display; and a 4-20 mA DC current loop output
  • Detector Type: Single pass, non-dispersive infrared
  • Sensitivity: 25 ppm
  • Accuracy: ±10 ppm ±10% of reading from 0-1000 ppm
  • Front Panel Indicators:
    • MONITOR ON - Green light ON when the unit is operating normally, or flashing during warm-up
    • SYSTEM FAULT - Yellow light ON when there is a system fault
    • ALARM - Red light ON when the gas level is above an alarm setting
  • Response Time: 9 to 30 seconds, depending on tube length and gas concentration
  • Max. Monitoring Distance: Up to 500 feet from measuring point to monitor
  • Operating Temperature: 32 to 122°F (0 to 50°C)
  • Humidity: 5 to 90% RH, non-condensing
  • Altitude Limit: 2000 Meters
  • Power: 100-240 VAC, 50/60 Hz, 15 Watts
  • Size/Weight: 14"H x 18"W x 4.7"D / 7 lbs
  • Certification: UL 61010A-1, CSA 22.2, CE Mark

Ordering Information

Part NumberDescription
3015-4280AGMSZ (Ammonia Gas Monitor Single Zone)
304-2742Sample tubing
304-2743Exhaust / purge line tubing (Note: Tubing 304-2742 is required for the gas sample line)
3015-3420Termination filter
3015-4121120 VAC surge protector
3015-41234-20 mA surge protector
3015-3069120 VAC external visual alarm
3015-3070120 VAC external audible alarm
3015-3076120 VAC external audible / visual alarm