MSA Bacharach MGS-450 Refrigerant Gas Fixed Detector

MSA Bacharach MGS-450 — Intelligent Refrigerant Leak Detection for Commercial and Industrial HVAC/R Systems

The MSA Bacharach MGS-450 is a high-performance fixed-point gas detector engineered for continuous refrigerant leak monitoring in commercial and industrial refrigeration and HVAC systems. Supporting over 25 refrigerant types including the latest A2L low-GWP blends, the MGS-450 provides reliable, 24/7 detection to safeguard personnel, equipment, and the environment.

Designed for seamless integration into building management systems (BMS), the MGS-450 delivers configurable analog and Modbus digital outputs, three user-configurable alarm relays, and Bluetooth connectivity via the MGS-400 mobile app. Its plug-and-play, pre-calibrated sensor modules simplify maintenance while temperature compensation minimises false alarms.

Key Features

• Broad Refrigerant Coverage
  Detects over 25 refrigerant types including R-32, R-410A, R-1234yf, R-1234ze, R-454B, R-454C, R-22, R-290, R-404A, R-407C, R-448A, R-449A, R-450A, R-452A, and more.
• Plug-and-Play Sensor Modules
  Pre-calibrated, temperature-compensated sensors replace without calibration gas — minimising downtime and maintenance cost.
• Flexible System Integration
  Configurable 4-20mA, 0-5V, 0-10V, 1-5V, or 2-10V analog output plus Modbus RTU via RS-485. Compatible with Bacharach MGS-408 controller and third-party BMS/BAS systems.
• Bluetooth Mobile Connectivity
  Configure and monitor wirelessly via the MGS-400 mobile app (Android and iOS).
• Three Configurable Alarm Relays
  Two alarm relays and one fault relay, all user-configurable for custom threshold and failsafe settings.
• Cold Environment Performance
  Operates reliably from -40°C to +50°C — ideal for cold rooms, freezers, and outdoor installations.
• Choice of Enclosures
  Available in IP41 (standard) or IP66 (weatherproof) rated housing for indoor and outdoor applications.
• Safety Code Compliance
  Supports compliance with ASHRAE 15, EN 378, and CSA B52 refrigeration safety standards.

Technical Specifications

• Model: MGS-450
• Detection Method: Electrochemical / Catalytic Bead / Infrared (sensor-dependent)
• Target Gases: Refrigerants (25+ types), CO, CO2, NH3, NO2, O2, combustible gases
• Measuring Range:
  • Refrigerants: 0–1,000 ppm
  • CO2: 0–50,000 ppm (configurable ranges)
  • NH3: 0–5,000 ppm
  • CO: 0–500 ppm
  • O2: 0–30 Vol%
  • Combustible: 0–100% LEL
• Power Supply: 24 VDC (19.5–28.5 VDC) or 24 VAC ±20%
• Power Consumption: 4W (max)
• Analog Output: 4-20mA, 0-5V, 0-10V, 1-5V, or 2-10V (configurable)
• Digital Output: Modbus RTU via RS-485
• Relay Outputs: 3× SPDT (2 alarm + 1 fault), 1A @ 30VDC
• Enclosure Rating: IP41 (standard) / IP66 (optional)
• Dimensions (IP41): 165 × 165 × 77 mm
• Dimensions (IP66): 165 × 165 × 87 mm
• Weight: 480 g (1 lb 1 oz)
• Operating Temperature: -40°C to +50°C (-40°F to +122°F)
• Operating Humidity: 5–90% RH, non-condensing
• Alarm Indicator: Tri-colour LED (green/orange/red) + audible alarm 72–80 dB
• Certifications: CE, UL/CSA/IEC EN 61010-1, EN 50270, EN 14624
• Standards Compliance: ASHRAE 15, EN 378, CSA B52
• Warranty: 1 year

Applications

• Supermarkets and Retail Refrigeration
• Cold Storage and Food Processing Facilities
• Commercial and Industrial HVAC Systems
• Mechanical Plant Rooms
• Ice Rinks and Skating Facilities
• Pharmaceutical Cold Rooms
• Data Centre Cooling Systems

The MGS-450 delivers peace of mind through continuous, intelligent refrigerant monitoring — protecting people, assets, and the environment while supporting compliance with international refrigeration safety codes.