As the quality of life improves, home appliances are becoming increasingly intelligent and multifunctional, while safety standards for gas appliances are becoming more stringent. Water and dust resistance (e.g., IP rating) has become an important indicator of product quality for home appliances and gas appliances. With its high-precision detection capability and flexible customization options, the AMT air tightness tester provides reliable leak testing solutions for the home appliance and gas appliance industry.
Leak testers are mainly used in industries such as household appliances, gas appliances, valves, and fittings. Using dry compressed air as the medium, they pressurize (or evacuate) the product under test and calculate pressure changes to determine product quality on the production line.
I. Home Appliance Field
Components in home appliances that involve water or air circuits, as well as products that operate in humid environments, require rigorous leak testing.
1. Kitchen Appliances
| Test Object | Testing Requirements | AMT Solution |
|---|
| Coffee makers | Water tank sealing, pipe connections | Custom sealing fixtures, sealing verification under simulated working pressure |
| Juicers/Blenders | Cup sealing, dynamic sealing of blade shafts | Dynamic sealing test mode simulating high-speed rotation |
| Electric kettles | Kettle body and base sealing | Overall air tightness test to ensure no leakage when pouring water |
| Water dispensers | Water tank, water circuit system | Multi-channel synchronous testing covering entire water circuit |
| Humidifiers | Water tank sealing, mist outlet channel sealing | Low-pressure test mode simulating atmospheric working conditions |
| Aroma diffusers | Water tank sealing, atomizer plate sealing | Micro-leak identification to ensure no leakage during long-term use |
Industry data shows that sealing failures account for more than 30% of after-sales issues in kitchen appliances due to water contact scenarios. The AMT series instruments use high-quality sensors and valve groups, with differential pressure sensor resolution reaching 0.01 Pa, enabling precise identification of micro-leaks.
2. Cleaning Appliances
| Test Object | Testing Requirements | AMT Solution |
|---|
| Electric toothbrushes | IPX7 whole-unit waterproofing | Indirect test method: custom tooling to enclose product in sealed space |
| Facial cleansers | Use in wet environments | Negative pressure test mode to identify micro-gaps in housing |
| Water flossers | Water tank sealing, water circuit system | Positive pressure decay method simulating high-pressure water environment |
| Robotic vacuum cleaners | Whole-unit waterproofing, water tank sealing | Multi-station testing adapted to automated production lines |
Personal care products such as electric toothbrushes and facial cleansers must meet IP67 waterproof ratings. AMT provides customized test solutions with total test time of approximately 50 seconds, test pressure of 20 KPa, and maximum leak value of 0.06 KPa.
3. Major Appliances
| Test Object | Testing Requirements | AMT Solution |
|---|
| Refrigerators | Evaporator, condenser line sealing | Underwater air tightness test or positive pressure decay method |
| Air conditioners | Evaporator, condenser, pipe joints | High-pressure test mode simulating refrigerant working pressure |
| Washing machines | Inlet valves, drain pumps, door seals | Dynamic sealing test simulating washing conditions |
| Water heaters | Inner tank, pipe system | High-pressure hold test ensuring long-term safety |
The sealing of heat exchange components such as refrigerator evaporators and air conditioner condensers directly affects cooling performance and energy efficiency. AMT supports a test range of 0–600 KPa to meet the needs of different products.
4. Small Appliances and Others
| Product Type | Testing Requirements | Application Scenario |
|---|
| Irons | Water tank sealing | Sealing reliability under high-temperature working conditions |
| Shavers | Full-body washable waterproofing | Prevents water ingress during use in wet environments |
| Smart toilets | Water circuit system sealing | Long-term water exposure ensuring safe use |
| Water purifiers | Filter elements, pipe joints | High-pressure water circuit system sealing verification |
II. Gas Appliance Field
The air tightness of gas appliance products directly relates to user safety and is a key indicator monitored by national mandatory standards. The gas appliance industry is a traditional application area for leak testers, with mature and stable market demand.
1. Gas Water Heaters
| Test Component | Testing Requirements | AMT Solution |
|---|
| Gas valve bodies | Gas passage sealing | Dual-pressure test mode simulating different operating states |
| Water valve bodies | Water passage sealing | Water circuit air tightness test to prevent water leakage |
| Heat exchangers | Combustion chamber and heat exchanger sealing | Sealing verification under high-temperature conditions |
| Burners | Gas distribution uniformity | Flow test mode to verify ventilation uniformity |
| Complete units | Whole-unit air tightness | Comprehensive test program covering all gas passages |
The gas valve body of a gas water heater is a core safety component requiring two types of pressure testing. AMT supports multi-program storage for flexible switching between different test parameters.
2. Gas Cooktops
| Test Component | Testing Requirements | AMT Solution |
|---|
| Ignition switches | Gas passage sealing | Low-pressure high-precision test, pressure range 0.1–25 kPa |
| Complete cooktops | Whole-unit gas system sealing | Comprehensive gas circuit test simulating use conditions |
| Burner heads/flame dividers | Gas distribution channels | Flow test mode to verify ventilation uniformity |
| Gas valves | Valve core sealing | Multi-station synchronous testing adapted to automated assembly lines |
Air tightness testing of ignition switches and complete gas cooktops is standard in the industry. Professional instruments such as the ZC-D intelligent leak tester meet low-pressure test requirements from 0.1 kPa to 25 kPa.
3. Gas Meters and Valves
| Test Object | Testing Requirements | AMT Solution |
|---|
| Gas meters | Metering chamber sealing | Dual-channel synchronous testing simulating actual working pressure |
| IC card gas meters | Meter body + solenoid valve sealing | Comprehensive test program covering entire gas circuit |
| Gas meter solenoid valves | Valve sealing | Micro-leak identification, leak rate down to 10⁻⁴ cc/Sec |
| Pressure regulators | Pressure regulating chamber sealing | Dynamic pressure testing verifying regulation stability |
ALM series leak testers have been successfully applied at companies such as Shanghai Gas Meter Co., Ltd. and Chongqing Qianwei Instrument Factory, with technical performance reaching advanced international levels.
4. Key Technical Points for Gas Appliance Testing
| Test Requirement | Parameter Range | AMT Configuration |
|---|
| Test pressure | 0–20 KPa (typical for gas appliances) | Standard 0-4 bar sensor covering full range |
| Test sensitivity | 1 Pa (0.1 mmH₂O) | Differential pressure sensor resolution 0.01 Pa, meeting sensitivity requirements |
| Measurable leak rate | 10⁻⁴ – 10⁻³ cc/Sec | Flow sensor optional range 5-5000 ml/min |
| Test volume | 0–1000 cc | Supports automatic volume reading or manual input |
Gas appliance testing typically uses the differential pressure method, comparing a standard part with the test piece to eliminate environmental influences such as temperature and vibration, achieving high-precision measurement results.
III. Testing Methods and Selection Guide
| Testing Method | Applicable Scenarios | Accuracy Level | AMT Recommended Configuration |
|---|
| Direct pressure method | Large-volume products (refrigerator evaporators, water heater tanks) | 10–100 Pa | AMT series standard direct pressure mode |
| Differential pressure method | Small to medium precision components (gas valves, ignition switches) | 0.01 Pa resolution | AMT series high-precision differential pressure sensor |
| Flow method | Ventilation testing (burners, flame dividers) | ml/min level | AMT series flow sensor (5–5000 ml/min optional) |
| Negative pressure method | Whole-unit products without inflation ports | Better than ±0.1 Pa | Indirect test mode with custom tooling |
IV. Core Advantages of the AMT Air Tightness Tester
1. High Precision and High Stability
The AMT series uses high-performance dedicated CPUs and 24-bit A/D conversion, with differential pressure sensor resolution reaching 0.01 Pa, enabling precise identification of micro-leaks in gas appliances. High-quality sensors and valve groups, along with a high-performance pneumatic system and embedded computer technology, ensure high reliability and stability.
2. Intelligent Data Management
Storage for 100 test programs, multi-level password protection
Storage for up to 1 million test results, USB automatic export to Excel format
Real-time SPC quality analysis: total tests, pass rate, average of qualified products, and more
Real-time test curve display, real-time monitoring of pressure and time status at each stage
3. Flexible System Integration
Rich I/O interfaces: 37-pin I/O output, 25-pin I/O input for easy PLC connection
Multiple communication methods: RS232, Ethernet, optional WiFi/Profinet/Profibus
Can connect to MES systems for real-time traceability of test data
4. User-Friendly Operation
7-inch LCD touchscreen, visible under sunlight
Start/stop buttons with built-in pass/fail indication (green/red light ring)
Bilingual Chinese/English interface, suitable for export equipment
V. Advantages of AMT Solutions
1. Full Process Coverage
From component-level testing to complete unit air tightness re-inspection, from R&D validation to production line inspection, AMT provides air tightness testing equipment for the entire lifecycle of home appliance and gas appliance products.
2. Non-Standard Customization Capability
For special conditions such as irregularly shaped products, multi-station requirements, and automated line integration, custom fixtures and testing solutions are available. AMT can assist enterprises in training front-line staff to achieve information-based and intelligent testing methods.
3. Rapid Local Service
Adhering to the service philosophy of "rapid response, mission accomplished," AMT provides 7×24 hour technical support to customers.
VI. Conclusion
In the home appliance and gas appliance industry, leak testing has evolved from a traditional "quality control" step into a core pillar of "safety assurance + user experience." For gas appliances, air tightness is the safety bottom line; for home appliances, waterproof sealing is quality assurance. The AMT air tightness tester, with its professional spirit of "leading technology and continuous improvement," provides reliable, accurate, and efficient leak testing solutions for the home appliance and gas appliance industry, helping customers realize the vision of "making manufacturing smarter."
If you have leak testing needs for home appliance or gas appliance products, please contact our engineers for a customized solution.
