D400 - Refrigerant Gas Leak Detector

The TTC model D400 leak detector features a long life heated sensor technology that is designed to detect the more current and difficult HFC refrigerants such as R-134a in addition to all HCFC and CFC refrigerants including SNAP approved hydrocarbon blends. The D400 instrument does not require rechargeable batteries.


  • Long life, stable sensor
  • Automatic calibration and reset to ambient levels
  • 3 adjustable sensitivity levels
  • True mechanical pump
  • Low battery indicator
  • Uses 4 AA alkaline batteries
  • SAE J2791, SAE J1627, and EN14624 Certified
  • CE Certified
  • Made in USA
  • 2-year warranty which includes the sensor

D400 Specifications

Model  # Model D400
Name Heated Sensor Refrigerant Leak Detector
Sensitivity .05 oz/yr R-134a and .025 oz/yr R-22
Sensor Life > 300 hours
Response Time Instantaneous
Power Supply 4 AA Alkaline batteries
Battery Life 8 hours continuous
Warm up time < 20 seconds
Probe length 17 inches


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