Emerson MRLDS-250 Broad Spectrum 0-3500 ppm

SKU: 809-0030

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Same as Bacharach MGS-250 Broadband Infrared Gas Detector 6401-0500.

The Modular Refrigeration Leak Detection Sensor is Copeland's state-of-the-art infrared refrigerant gas detector which can detect a wide range of gases. The MRLDS can be used on a stand-alone basis or integrated into a supervisory controller. The MRLDS-250 can be used in locations that require continuous monitoring and to add gas detection solutions to an existing system.

Broadband vs Gas Specific

The MRLDS-250 is available in two versions:

  • The broadband gas detector is used as a general purpose gross leak detector and is factory tested and certified to +/- 35% accuracy.
  • The gas specific version comes factory certified and calibrated with +/- 3% accuracy to the target refrigerant when there is a need for more accurate detection.


  • Refrigerant monitoring can reduce energy consumption and keep equipment cooling properly.
  • The MRLDS-250 can pay for itself by reducing the amount of refrigerant being lost when used in a continuous monitoring program.
  • MRLDS-250 is immune to cross sensitivities to combustible and toxic gas as well as changes in temperature and humidity.
  • Protect people, products, and equipment from dangerous situations and costly failures.
  • IR sensing technology allows for low-level leak detections (0-3,500ppm), delivering up to 5-7 years of maintenance free operation without the need for costly annual gas calibrations.
  • Simple to use interface gives the ability to set all parameters and outputs without opening the unit, moving jumpers, using multimeters or adjusting potentiometers.


  • Detects all refrigerants (CFC, HFC’s, HCFC, HFO’s) including HFO1234YF, HFO1234ZE, R410a & R22
  • Bright alpha-numeric LED real-time display
  • On-board LED indicator and audible alarm to alert personnel in the area that levels have exceeded the desired limit
  • Can connect to any controller through analog output onboard or Modbus RTU interface
  • No field calibrations required
  • Maintenance mode to avoid false alarms during maintenance
  • Scalable 0-3500ppm detection range
  • Onboard relay NO, NC: can be programed to be fail safe (normally energized)
  • MRLDS-250 supports Refrigerants R123, R134a, R404a, R407a, R407c, R407f, R410a, R427a, R507, HFO1233ZD, R448A, R449A
  • The MRLDS-250 809-0030 replaces discontinued part numbers 809-1000, 809-1001, 809-1010. 809-1011, 809-1012, and 809-1014.
  • Equivalent to Bacharach Part 6401-0500
  • Part Number: 809-0030

It is recommended to purchase power supply 640-0015 when ordering this leak detector.