Bacharach MGS-250 Infrared Gas Detector, R-1234yf

SKU: 6401-0513

MGS-250 Infrared Gas Detector

Safety Gas Detection for CFC, HFC, HCFC and HFO Refrigerants

Bacharach’s MGS-250 Infrared Gas Detector is a cost-effective solution for compliance with refrigeration safety codes (ASHRAE 15, CSA-B52) and emissions reduction standards (F-Gas, CARB).

  • Long-life, proprietary infrared (NDIR) sensor provides 5-7 years of maintenance-free service while detecting the presence of a target gas down to 20 ppm Minimum Detection Level (MDL)
  • Sensor is not prone to false alarms caused by cross-interference from other gases or sudden changes in temperature or humidity
  • 4-digit LED display shows real-time concentration readings and makes configuration and self-diagnostics intuitive
  • Configurable analog output (4-20mA, 0-5V, 0-10V, 1-5V or 2-10V) and Modbus communications for integration with Bacharach’s MGS-408 controller or third-party BMS / BAS control systems
  • User-configurable relay (alarm) may be used to activate external beacons / sounders, ventilation or other countermeasures
  • Integrated audible / visual alarms for refrigeration safety compliance – no additional hardware


Bacharach’s MGS-250 Infrared Refrigerant Gas Detector is the leader in performance and flexibility. It can be configured as either a broadband sensor used for gross leak detection, or as a gas-specific version that’s pre-calibrated and characterized for precision response to individual refrigerants. It meets ASHRAE 15, EN 378, and CARB RMP compliance requirements. The MGS-250 is the economical solution for detecting refrigerants without the limitations posed by solid-state sensor technologies.

Advanced infrared sensing technology makes the MGS-250 immune to cross sensitivities from combustible and toxic gases, as well as changes in temperature and humidity. The infrared sensor provides low-level 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 alarm to alert personnel when levels have exceeded the preset limit.

Product Specifications

  • Sensor Channels: 1
  • Measuring Range: 0 to 3,500 ppm
  • Sensitivity / Minimum Detection Limit: 10 ppm
  • Accuracy: +25% (Broadband Sensors) +5% (Gas-specific Sensors)
  • Resolution: 1 ppm
  • Enclosure Rating: General Purpose
  • User Interface: 4-digit, 7-segment red/green LEDs; configuration push buttons
  • Power: 24 VDC +20% or 24 VAC +20%, 2.5W
  • Analog Communications: 4 to 20 mA, 0 to 5 V, 0 to 10 V, 1 to 5 V, 2 to 10 V
  • Digital Communications: Modbus RTU via RS 485
  • Operating Voltage: 24 VDC or 24 VAC
  • Relay Rating: 1 alarm relay, SPDT
  • Wiring: 1 A @ 24 VDC, 0.25 A @ 240 VAC, resistive load
  • Alarm: Integrated Audible / Visual Alarm
  • Ambient Temperature: -22 to 104°F (-30 to 40°C)
  • Humidity: 5 to 90 %RH, non condensing
  • Altitude: 0 to 6,560 ft (2,000 m)
  • Status Indicator: 4-digit, 7-segment red/green LEDs
  • Buzzer Volume: 80 dB @ 10 cm
  • Product Dimensions Product Dimensions (L×W×H): 4.0” × 5.5” × 1.5” (100 × 140 × 40 mm)
  • Product Weight: 6.3 oz (180 g)
  • Sensor Type: NDIR
  • Expected Sensor Service Life: 5 Years
  • Approvals: CE, UL, CSA, IEC, EN 61010-1
  • Warranty: 1 Year
  • Country of Origin: United States
  • Part Number: 6401-0513

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