Field Instruments

General

The MSA Bacharach® MGS-250 Infrared Refrigerant Gas Detector delivers accurate, stable and precise refrigerant monitoring for safety and regulatory compliance. It can be configured as either a broadband sensor used for coarse leak detection (ASHRAE 15, EN 378), or as a gas specific version that’s characterized for precision response to individual refrigerants (CARB). The MGS-250 is the economical solution for detecting refrigerants without the limitations posed by solid-state sensor technologies.

Advanced infrared sensor technology makes the MGS-250 immune to cross sensitivities from combustible and toxic gases, as well as changes in temperature and humidity. The sensor provides accurate leak detection and delivers up to 5 to 7 years of virtually maintenance-free operation. The MGS-250 has an alpha-numeric LED display, status indicator, on-board relay and Modbus via RS485. An audio-visual alarm is included to alert personnel when measurements exceeded the user-defined threshold, enabling compliance with safety standards including AHSRAE 15 and EN 378.

Features

• Minimize false alarms from cross-interference from other gases, temperature and humidity
• On-board Audio-visual Alarms Enable compliance with regulatory standards, including ASHRAE 15, EN 378:2016*, and EN 14624:2020* (*A1 gases only)
• Modbus, 4-20mA Output & Alarm Relay Integrate with BMS / BAS control systems to initiate action when a leak is detected
• Digital Display Screen Easy user interface for configuration and set-up
• Self-diagnostics Enhanced troubleshooting capability
• Minimal Maintenance Requirements Low cost of ownership
• Optional MGS-408 Controller Available Create an independent, centralized alarm system with up to 8 gas detectors.

Specifications

• Make: MSA
• Model: 6401-0505
• Sensor Type: Non Dispersive Infrared (NDIR)
• Detectable Gas: R-407a
• Sensor Range: 0-3,500 ppm
• Response Time: 90 Seconds
• Accuracy: ±3%
• Analog Outputs: 4 to 20 mA, 0 to 5 V, 0 to 10 V, 1 to 5 V, 2 to 10 V
• Digital Communication: Modbus RTU
• Power Supply: 24V AC or DC (auto selecting), 4W (max)
• Audible Alarm: Buzzer (80 dB @ 10cm), enable / disable
• Display/LED: Red 4-digit alpha-numeric LED display; Power LED
• Relays: Selectable; 0 to 15 minutes
• Enclosure Ratings: IP66
• Humidity: 5 to 90 % RH, non-condensing
• Approvals: CE, UL/CSA/IEC/EN 61010-1* (*A1 gases only)

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