Working Principle Of Leak Detector

A leak detector is a device specifically designed to detect the flow rate of gas or liquid leaks within an object or system. Its operating principle is based on fluid mechanics, measuring the pressure difference between the inside and outside of the object to determine the leak's flow rate. A leak detector primarily consists of a differential pressure sensor and a vacuum pump. When the object is connected to the leak detector, the vacuum pump creates a negative pressure inside the object, and the differential pressure sensor then detects the pressure difference between the inside and outside of the object. When a leak occurs within the object, the pressure inside the leak will be higher than the pressure outside the leak. The leak flow rate is proportional to the pressure difference, which the differential pressure sensor measures and converts into the leak flow rate for calculation.
 

Leak detectors are primarily divided into two types: portable and fixed. Portable leak detectors are generally used for field testing in locations such as pipelines and containers, while fixed leak detectors are suitable for online monitoring in locations such as gas or liquid storage tanks and chemical plants.

 

To use a leak detector, you first need to prepare the leak detector and the appropriate leak detection agent. Then, select the appropriate leak detection agent based on the material of the object being tested and the testing requirements. The surface of the object being inspected must be kept clean, free of impurities such as oil and dust. The leak detector must be preheated before testing. Spray the leak detector onto the surface of the object being inspected, or soak the object in the leak detector. After a certain period of time, observe the changes in the leak detector. If the leak detector foams or changes color on or within the object, it indicates a defect.
 

Based on the test results, you can preliminarily determine the type and location of the defect. If the test results are uncertain, perform multiple tests or use other testing methods for verification. It is also important to note that different types of leak detectors have different effects on the object being inspected, so the choice should be based on the actual situation.
 

In short, a leak detector is a very important testing device that can effectively detect leaks in objects or systems, ensuring production safety and reducing resource waste.