The selection of leak detectors directly affects detection accuracy, efficiency, and usage costs, and needs to be combined withDetection object, industry scenario, accuracy requirementsTaking into account multiple dimensions, the following are detailed selection steps and core reference factors:

1、 Clarify core testing requirements

1. Determine the type of detection medium and leakage point

The leak detection techniques for different media vary greatly, and it is necessary to first lock the detection object:

•Gas classIf detecting gas leaks such as air, nitrogen, helium, etc., priority should be given to airtight leak detectors; If it is a flammable and explosive gas (such as hydrogen, methane), a gas leak detector with explosion-proof certification should be selected, and the corresponding gas sensor should be adapted.

•Liquid typeFor liquid leaks such as water, oil, and refrigerants, liquid leak detection equipment such as optical leak detectors, ultrasonic leak detectors, and some scenarios can also be supplemented with penetration detection reagents.

•Special mediaFor micro leaks in vacuum systems and high-purity gas leaks in the semiconductor industry, it is necessary to focus on ultra high sensitivity leak detection solutions.

2. Clearly define the requirements for detection accuracy and leakage rate

Leakage rate is the core indicator for selection, and the standards for leakage rate vary greatly in different industries

•Ordinary industrial scenario(such as automotive parts, home appliance casings): The leakage rate requirement is usually within10^{-2} \\sim 10^{-5} \\text{Pa·m}^3/\\text{s}A conventional airtight leak detector is sufficient.

•High precision scene(such as aerospace components, vacuum equipment, medical devices): must meet10^{-7} \\sim 10^{-12} \\text{Pa·m}^3/\\text{s}At this time, helium mass spectrometer leak detector is a very good choice for its leakage rate, and its sensitivity far exceeds other types of equipment.

•Rough leak detection scenario(such as large-scale pipeline leakage investigation): With low precision requirements, soap bubble leak detection tools or portable ultrasonic leak detectors can be used to balance cost and efficiency.

3. Adapt to the volume and shape of the detection object

•Small volume workpieces(such as precision valves, electronic components): suitable for useDifferential pressure airtight leak detectorFast detection speed and stable accuracy, capable of batch detection.

•Large volume container(such as gas storage tanks, large pipelines): It is recommended to chooseFlow type airtight leak detectorThis can avoid the problem of long detection time caused by large workpiece volume.

•Complex structural components(such as engine cylinder block, hydraulic valve body): Priority should be given to leak detectors that support multi-channel detection and customizable detection processes. At the same time, specialized fixtures should be used to ensure the sealing of the detection.

2、 Match industry application scenarios

1. Automotive manufacturing industry

The demand for leak detection in the automotive industry is concentrated in components such as engines, transmissions, fuel systems, and braking systems. The selection must meet the following requirements:

•Has high repeatability (error)≤1%）Adapt to batch testing on production lines;

•Support multiple detection modes (pressure difference, flow rate, helium detection) to meet the leakage rate requirements of different components;

•Can work with the production lineMESSystem integration enables real-time uploading and tracing of detection data.

2. Semiconductor and Photovoltaic Industry

The industry has very high requirements for gas purity and sealing. The key points for selecting leak detectors are:

•Select helium mass spectrometer leak detector, and it is necessary to haveDry pump systemTo avoid oil vapor pollution of workpieces;

•The detection limit needs to reach10^{-10} \\text{Pa·m}^3/\\text{s}Meet the micro leak detection requirements for vacuum chambers and gas pipelines;

•The equipment needs to have cleanroom certification and be suitable for dust-free production environments.

3. Medical device industry

The leak detection of medical equipment (such as syringes, dialyzers, endoscopes) must comply withGMPAccording to industry standards, selection should pay attention to:

•Priority should be given to using oil-free air or medical grade nitrogen as the detection medium to avoid contaminating medical devices;

•The equipment needs to have calibration certificates and data storage functions to meet the regulatory requirements for traceability of testing;

•For micro channels of minimally invasive instruments, high-precision helium detectors or laser leak detectors should be selected.

4. Refrigeration and air conditioning industry

The leak detection of refrigeration systems mainly targets refrigerants (such asR32TheR410a）Selection suggestion:

•selectHalogen leak detectororInfrared refrigerant leak detectorCan accurately identify refrigerant leaks;

•The equipment needs to have anti-interference ability to avoid other gases in the workshop affecting the detection results;

•Supports both portable and fixed forms, meeting both production line inspection and after-sales maintenance scenarios.

3、 Consider the core performance and additional attributes of the device

1. Core performance indicators

•response timeResponse time required for routine production line inspection≤1sHigh precision detection is acceptable3-5sResponse time;

•stabilityContinuous operation of equipment 8 Hourly detection data drift≤±0.5%To avoid misjudgment caused by equipment fluctuations;

•measurement rangeIt is necessary to cover the leakage rate range of the detection object and reserve a certain range redundancy to adapt to subsequent process upgrades.

2. Usability and adaptability

•operating interfacePrioritize the use of touch screens and devices that support Chinese language operations to reduce the learning costs for production line workers;

•Tool compatibilityThe device interface needs to be standardized and can be flexibly adapted to different fixtures to reduce customization costs;

•mobilityPortable leak detector (weight) should be selected for on-site inspection scenarios≤5kg）Fixed integrated equipment can be selected for production line scenarios.

3. Cost and Maintenance

•procurement costThe price of ordinary airtight leak detectors is relatively low (tens of thousands of yuan), while the cost of helium mass spectrometer leak detectors is relatively high (hundreds of thousands to millions of yuan), which needs to be balanced with budget and testing needs;

•operating costThe helium detector needs to be regularly replenished with helium gas, and the vacuum pump needs to be maintained regularly. The cost of consumables needs to be calculated in advance;

•after-sales serviceChoose a brand with a localized after-sales team to ensure that equipment failures can occur in the event of a malfunction 24 Response within hours, while confirming the calibration cycle and maintenance costs.

4. Safety and Compliance

•Explosion proof scenarios need to be selectedExExplosion proof certified leak detector;

•The medical and food industries need to ensure that equipment complies with corresponding industry certifications (such asFDATheCE）；

•The equipment should have safety functions such as overvoltage protection and alarm prompts to avoid damage to the workpiece or personnel during the detection process.

4、 Comparison and selection suggestions for common types of leak detectors

Hangzhou Yushi Technology Co., LtdFocusing on providing technical services and solutions related to flow, pressure, vacuum detection and control for industrial and scientific research customers, the company acts as an agent and distributor in the United StatesALICAT、 Swiss Vogtlin, American MKS, Japanese EBARA and other brands, combined with their agent products, provide customers with high-quality flow and pressure monitoring solutions, aiming to improve customers' research and production efficiency, improve their manufacturing processes, and promote their scientific research and innovation progress.