Bacharach MGS-450 Gas Detector

Bacharach MGS-450 Gas DetectorBuilt on Bacharach’s primary MGS-400 platform, the MGS-450 provides reliable refrigerant leak detection for industrial and commercial refrigeration, chiller rooms and machinery rooms. It features an IP66 enclosure for harsh environments and operates down to -40 °C, making it ideal for cold applications.
Compared with the entry MGS-410, the MGS-450 adds three configurable alarm relays plus an analogue output (4–20 mA/voltage) alongside Modbus RTU (RS-485) communications. This lets you drive local audio/visual alarms, start mechanical ventilation, or interface directly with BMS/fire panels without a separate controller.
Sensors are pre-calibrated, plug-and-play modules available in semiconductor, infrared, electrochemical and catalytic bead technologies — covering halogenated refrigerants, CO₂, methane/R290, oxygen, carbon monoxide and ammonia. The detector includes integrated A/V indication and supports Bluetooth app configuration across the MGS-400 family.
Backed by MSA Bacharach’s refrigeration focus and Frontline Safety’s technical support, the MGS-450 is a versatile choice when you need local control via relays plus seamless system integration.

Key Features

Integrated Control: 3 configurable alarm relays for fans, beacons, or shutdowns.
Analogue & Digital Outputs: 4–20 mA / selectable voltage + Modbus RTU (RS-485).
IP66 Enclosure & Low-Temp Operation: Built for cold rooms and wet areas; operates to -40 °C.
Plug-and-Play Sensors: Pre-calibrated modules reduce downtime and simplify swaps.
Wide Gas Coverage: Semiconductor, IR, EC and catalytic bead options (refrigerants incl. CO₂, NH₃, R290/CH₄, halogenated gases, O₂, CO).
Built-in Audio/Visual Alarms: Local LED/buzzer indication for quick awareness.
Bluetooth App Support: Streamlined configuration and maintenance (MGS-400 Companion App).

Gases and Ranges

Refrigerants: 1,000 ppm
CO₂: 5,000 / 10,000 / 20,000 / 30,000 / 40,000 / 50,000 ppm
NH₃: 100 / 1,000 / 5,000 / 100% LEL
O₂: 30 Vol%
CO: 500 ppm
Combustible gases – Semiconductor (R-290, R-600, R-50, R-600a, HC-12a, R-717): 5,000 ppm
Combustible gases – NDIR (R-600, R-50, R-290): 100% LEL
Combustible gases – Catalytic (R-600, R-50, R-290, R-717): 100% LEL
NO₂: 20 ppm

Status Indicator

Single tri-color LED (green, red, orange)

Buzzer

72 dB @ 10 cm

Output

Analog: Single configurable output (4–20 mA, 0–5 V, 0–10 V, 1–5 V, 2–10 V)
Digital: Modbus RTU via RS-485

Power Supply

24 V AC or DC (auto selecting), 4 W (max)

Relay

Three SPDT relays, fixed low / high / fault alarms
Rating: 1 A @ 30 VDC

Enclosure

IP41 or IP66

Size (W × H × D)

IP41: 6.5 × 6.5 × 3.0 in (165 × 165 × 77 mm)
IP66: 6.5 × 6.5 × 3.4 in (165 × 165 × 87 mm)

Weight

Approx. 480 g (1 lb 1 oz)

Approvals

CE, UL / CSA, IEC EN 61010-1

Ambient Conditions

Temperature
Semiconductor: -40 to +122 °F / -40 to +50 °C
Electrochemical:
– NH₃ 100 / 1,000 ppm: -40 to +40 °C
– NH₃ 5,000 ppm: -20 to +40 °C
– CO 500 ppm: -40 to +50 °C
– NO₂ 20 ppm: -20 to +40 °C
– O₂ 30% Vol: -20 to +50 °C
Infrared: -40 to +122 °F / -40 to +50 °C
Catalytic Bead: -40 to +122 °F / -40 to +50 °C

Humidity
5 to 90 % RH, non-condensing

Pressure
23.6 to 32.5 in Hg / 800 to 1,100 mbar