D640 - A/C System Tracer Gas (H2-N2) Leak Detector
339-D640, H2 Tracer Gas (forming gas) Leak Detector
The 339-D640 Leak Detector is designed to detect a special H2N2 Tracer Gas (forming gas). H2N2 Tracer Gas can be purchased very cheaply at any welding or industrial gas supply store. The instrument is not design certified to SAE Standard J2970 and it will detect concentrations of H2 (forming gas) less than 5ppm. A vehicle that is suspected of having a refrigerant leak/s in the A/C system (regardless of refrigerant type) should be first leak tested with a refrigerant leak detector
that is compliant with SAE Standards J2791 (R134a) or J2913 (R1234yf). If a leak/s is detected the source of the leak/s should be identified and marked and the A/C system should be professionally and fully evacuated with an SAE compliant refrigerant recovery and recycling machine. Following the professional evacuation of the A/C system, the leak/s source should be repaired. To test the quality of the repair/s the A/C system should then be charged with no more than 50 psi of H2N2 Tracer Gas consistent the workshop manual. Once the A/C system is charged with the H2N2 Tracer Gas the 339-D740 leak detector should be used to check the integrity of the leak source repair. If it is determined that the system is leak free the H2N2 Tracer Gas may be vented to the atmosphere and the system can be professionally charged with the appropriate refrigerant gas. Using this method ensures that the expensive refrigerant gas is not lost in the atmosphere during extensive service procedure. Typically the cost for one vehicle's charge of the H2N2 Tracer Gas is less than one US dollar.
Techno Tools Corporation's model 339-D640 utilizes a solid-state mildly heated sensor designed to be highly sensitive to 95%-Hydrogen/ 5%-Nitrogen Tracer Gas (forming gas). The Tracer Gas mixture is frequently used for mobile leak detection service in response to Article 6, Paragraph 3 of the EU Directive 2006/40/EC. The instrument is not design certified with SAE Standard J2970 published in March of 2015 and it will detect concentrations of H2 (forming gas) less than 5ppm. The unique digital display allows for quick and precise pinpointing of the leak source and it indicates the relative size of the system leak. The instrument is CE Certified, and is housed in a rugged ABS high impact plastic enclosure. It is powered by four AA alkaline disposable batteries and does not require rechargeable batteries.