MGS-550 Industrial Gas Detector

Dual Gas Detector for Safety Compliance

• Flexible two-sensor capability, local and / or remote
• One user-interface platform for all sensor types
• Two analog outputs and Modbus RTU interface
• Three fully configurable, user-assignable relays
• Magnetic wand enables easy, non-intrusive configuration / calibration
• IP66-rated ABS enclosure provides protection from dust and water
• Meets ASHRAE 15 and EN 378 requirements

Bacharach’s advanced MGS-550 gas detector can utilize any combination of sensor technologies, including 
electrochemical, semiconductor (MOS), catalytic bead or infrared, in a single platform for unparalleled detection 
capability. It meets ASHRAE 15 and EN 378 requirements. The MGS-550 can easily be connected to any central 
control system using the current and volt analog output or the Modbus RTU interface. With three user assignable 
relays, it can also function as a stand-alone unit without the need to wire alarm devices back to a central system.

The straightforward menu structure is identical throughout the platform reducing the amount of training required 
for installing and maintaining this product family. At any point in time, the instrument can be upgraded from a 
one sensor to a two sensor system by simply registering another sensor. The MGS-550 is furnished with two analog 
outputs which can be assigned as redundant for one or for transmit the signal of two sensors.

Type				                Gas detector using Semiconductor, Electrochemical, Infrared or Catalytic Bead 
                                                sensor. For one or two sensor configuration

Gases				                Toxic gases: Ammonia, Carbon Dioxide, Carbon Monoxide, Ethylene, Nitrogen 
                                                Dioxide and Ozone
				                Combustible gases: Methane, Propane, Butane and LPG
				                Refrigerants: Ammonia, Carbon Dioxide, Hydrocarbons, and HFCs, HCFCs, CFCs

Measuring Range			        O2: 30 Vol%
				                CO: 1,000 ppm
				                NH3*, ***: 100 / 1,000 / 5,000 / 10,000 ppm / 100 %LEL
				                CO2: 5,000 / 10,000 / 20,000 / 30,000 / 40,000 / 50,000 ppm
				                Refrigerants: 1,000 / 10,000 ppm
				                Combustible Gases: 100% LEL
				                C2H4: 2,000 ppm
				                NO2: 20 ppm

Display				        5-digit, 7-segment red LED and green status LEDs

Audible Alarm			        85 dB buzzer

Output				        Analog: 4 to 20 mA, 0 to 5 V, 0 to 10 V, 1 to 5 V, 2 to 10 V
				                Digital: Modbus RTU via RS 485

Power Supply			        19.5 to 28.5 VDC or 24 VAC ± 20%; 3- or 4-wire

Relay				                3 relays, SPDT, user assignable
				                Rating 1 A @ 24 VDC, 0.25 A @ 240 VAC, resistive load
				                Alarm delay 0 to 15 minutes; user-programmable

Ambient Conditions		        Temperature: - 40 to +120 °F (40 to +50 °C)
				                Humidity: 5 to 90 %RH, non condensing
				                Altitude: 0 to 10,000 ft (3,050 m)

Enclosure options		                General Purpose: IP66 Rated ABS with four M20 x 1.5 ports

Size (w x h x d)		                General Purpose: 8.3” x 8.9” x 3.4” (210 x 225 x 85 mm)

Weight				        General Purpose: 2 lbs (1 kg)
				                Explosion-proof:  3.5 lbs (1.6 kg)

Approvals			                CE, UL, CSA, IEC, EN 61010-1

*Ammonia available as low temperature version -40°F / -40°C (not for 5,000 ppm electrochemical sensor)
**Not IP66 rated; not available for XP enclosure
*** MGS-550 is not approved as an explosion-proof product and should NOT be installed in hazardous