1. Introduction to air tightness leak detector

Air tightness leak detectorAlso known as leak detector, air tightness testing, waterproof detector, sealing detector, etc., it is mainly used for product sealing testing, waterproof testing, and IP protection level testing.

Most traditional leak detection methods use water immersion or soapy water spraying to determine whether there is leakage in the workpiece based on the visual inspection of the tester.The amount of leakage depends on the subjective judgment of the tester, so it is difficult to eliminate the influence of human factors on the test results, and it also determines that it cannot quantitatively measure the leakage rate of the workpiece.In addition, after testing with this method, additional work such as cleaning, drying and anti-rust treatment must be performed on the workpiece, which brings unnecessary trouble to production. Some products cannot be exposed to water and will be damaged once water enters, increasing the cost of waterproof testing.This is really an unwise method of detecting air tightness leaks.

With the acceleration of the industrialization process, the quality requirements for products are getting higher and higher. Traditional leak detection methods cannot meet the actual requirements. Therefore, most of the current air tightness leak detectors use differential pressure, direct pressure and flow type. Let's mainly look at the principle of differential pressure air tightness leak detection.

2. Differential pressure typeAir tightness detectorprinciple

The principle of differential pressure air tightness testing instrument: There is a reference volume (also called standard volume) in the system, and the system under test is another volume. A controlled valve is used to connect the two volumes. When they are inflated at the same time, their pressures are consistent, and then the valve is closed.After the connecting valve is left aside for a while, it will not leak because the standard volume is fully closed, so its pressure is the inflation pressure. If the test piece leaks, the pressure will drop. If there is more leakage, the pressure will drop more until it completely leaks. A sensor is used to measure the pressure difference between the two ends.Because the pressure difference is generally small when there is a small leak, a micro-range sensor can be used for measurement (generally between 300-----5KPa). Because the total range is greatly reduced, the absolute resolution and accuracy will reach a high level (generally between +-1Pa----+-20Pa, 1Pa is approximately equal to one hundredth of a gram)

three,Air tightness leak detectorMain features

Using a high-sensitivity pressure sensor, the air tightness test accuracy is higher; using a large-diameter air-controlled valve, it has the advantages of fast inflation speed, good sealing, no heat, and long service life.This air tightness testing instrument has an intelligent test sealing and waterproof function. According to the usage characteristics of the air tightness leak detector, it can effectively eliminate errors caused by temperature and deformation through automatic correction functions, achieve short-time precision measurement, and greatly improve testing efficiency.

4. Application fields of air tightness leak detector

The air tightness detector can be applied to motor vehicle parts: engines, cylinder heads, radiators, gasoline pumps; gas appliances: stove components and accessories, bellows, valves; electrical products: sealed relays, sealed motors, submersible pumps, hard drives, etc.; hydraulic and pneumatic components: solenoid valves, cylinders, filters, various water valves; others: medical equipment parts, watches, underwater cameras, air tightness testing, waterproof testing, air tightness leak detection