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 75 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
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Description

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.

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Sensor Channels: 1
Measuring Range: 0 to 3,500 ppm
Sensitivity / Minimum Detection Limit: 75 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 buttongs
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 (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

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MGS-250 Gas Detector Configurations

Gas Accuracy Part Number
R-22 ±5% 6401-0501
R-134a ±5% 6401-0503
R-404A ±5% 6401-0504
R-407A ±3% 6401-0505
R-407C ±3% 6401-0506
R-407F ±3% 6401-0507
R-410A ±3% 6401-0508
R-422A ±5% 6401-0509
R-422D ±5% 6401-0510
R-427A ±3% 6401-0511
R-507 ±5% 6401-0512
R-1234yf ±5% 6401-0513
R-1234ze ±5% 6401-0514
R-1233zd ±5% 6401-0515
R-32 ±5% 6401-0516
R-448A ±5% 6401-0517
R-449A ±5% 6401-0518
R-513A ±5% 6401-0519
R-452A ±5% 6401-0520

 

MGS-250 Broadband Gas Groups and Performance

Group # Gas Part Number
1 R-134a 6401-0500
1 R-404A 6401-0500
1 R-407A 6401-0500
1 R-407C 6401-0500
1 R-407F 6401-0500
1 R-410A 6401-0500
1 R-427A 6401-0500
1 R-507 6401-0500
1 R-1233zd 6401-0500
1 R-448A 6401-0500
1 R-449A 6401-0500
2 R-422A 6401-0500
2 R-422D 6401-0500
2 R-1234yf 6401-0500
2 R-1234ze 6401-0500
2 R-452A 6401-0500
2 R-513A 6401-0500
3 R-22 6401-0500
4 R-32 6401-0500
Description Part Number
Splash / Protective Shield (for use in spray down areas) 6900-0001
MGS-250 IR, Replacement Mounting Base 6400-0014