Helium Leak Tester for Automotive Fuel System Leak Detection

Technical Specifications of Helium Leak Detector SFJ-231

Helium Leak Detection in Automotive Fuel System

Helium mass spectrometer leak detectors are widely used in automotive fuel system leak detection due to their high sensitivity (up to 10⁻⁹ Pa·m³/s) and reliability. They are commonly used for leak detection in components such as fuel tanks, fuel lines, and evaporative emission systems.The following provides a detailed explanation of specific applications, leak detection methods, and procedures:

1. Vacuum Method (Negative Pressure Leak Detection)

Application Scenarios: Overall leak detection of sealed components such as fuel tanks and sealed pipelines.
Detection Steps:

• Vacuuming: Evacuate the fuel system to 10⁻² to 10⁻³ Pa (requires a vacuum pump system).
• Helium Blowing: Spray helium gas (pressure 0.1 to 0.2 MPa) around the test area (e.g., welds, joints).
• Detection Signal: Helium entering the system through leaks is captured by a mass spectrometer and triggers an alarm.
• Leak Point Localization: The leak point location is determined by moving the spray gun or segmentally isolating the system.

2. Pressurization Method (Positive Pressure Leak Detection)
Applicable scenarios: EVAP carbon canisters, fuel lines, and other pressure-resistant components.
Detection Steps:

• Helium mixture injection: Inject a mixture of 5%–10% helium and nitrogen into the component (pressure 0.3–0.5MPa).
• Seal and maintain pressure: After stabilizing the pressure, place the component in a vacuum chamber or connect it to the leak detector's suction gun.
• Detect leaks: Use a mass spectrometer to detect helium escaping from the leak.
• Advantages: Suitable for complex-shaped components, no need for overall vacuum extraction.

3. Sniffer Method (Local Scanning)
Application Scenarios: Online rapid leak detection of fuel systems that have been assembled (e.g., engine compartment piping).
Detection Steps:

• Internal Helium Filling: Fill the fuel system with helium (working pressure).
• External Scanning: Move the suction gun along weld seams, O-rings, and other areas (distance 1–3 mm).
• Real-Time Feedback: The mass spectrometer peak corresponds to the leak location

Anhui Wanyi Science and Technology Cooperated Limited Company founded in 2003, is a professional manufacturer and supplier of analytical instruments with an international vision and operational standards, whose leading products cover chromatography, spectroscopy, mass spectrometry and varieties of industrial applications such as environment monitoring, leak detection, industrial intelligence, industrial process, medical devices. The total number of employees is more than 1400, including 500 research and development engineers with 20 post doctors and 200 masters.

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Under the spirit of "Quality Wayeal, Service Wayeal", Wayeal is committed to building an enterprise with strong international competitiveness in the field of analytical instruments, industrial applications, and life health, and becoming a model of a responsible and respectable Chinese enterprise.