As we all know, the detection accuracy of helium mass spectrometer leak detectors is very critical. In various detection processes, the detection accuracy of helium mass spectrometer leak detectors should be controlled. So, what are the factors that affect the detection accuracy of helium mass spectrometer leak detectors? Let's take a look.
1. Detection pressure
For different measurement conditions, the dependence of the leak rate on the test pressure is different. Generally speaking, for high porosity (such as casting bubbles and cracks), the detection pressure has a greater impact on the leak rate, while the impact is smaller when the porosity is low. In addition, as the detection pressure increases, it will also bring a series of problems, such as temperature effects and the required stabilization time is extended. Therefore, it is recommended to perform leak detection on a specific workpiece within a certain pressure range, and then select a lower pressure to meet the test requirements to determine the final detection pressure. In addition, the tolerance of each mechanism of the tested part to the maximum detection pressure must also be considered.
2. Detection volume
In a specific leak rate value, if the detection volume increases, the corresponding pressure reduction rate will be lower, so the corresponding measurement time needs to be increased. Under certain specific conditions, if the measurement volume is not minimized, the required accuracy and sensitivity of the measurement may not be achieved.
3. Stabilization time
During inflation, compressed air enters a airtight container, resulting in a series of thermodynamic-kinetic changes. That is, when a certain volume of compressed air moves quickly into a airtight container, the pressure decreases. If a measurement is made at this time, this pressure change will be regarded as a pressure change caused by leakage, thus affecting the accuracy of the measurement results. The "inflation effect" is affected by the inflation pressure, test volume and test material. When the inflation pressure or test volume increases, the pressure reduction caused by inflation becomes obvious. One way to solve this problem is to add a stabilization time between inflation and measurement
4. Temperature
For gases in airtight container, when the temperature increases, their internal pressure also increases. Therefore, temperature changes inevitably become an important factor affecting pressure changes.
In order to ensure the accuracy of detection, it is necessary to ensure that the use and operating conditions of the instrument meet the requirements, and regular maintenance and calibration are carried out. By comprehensively considering these factors, the detection accuracy of the helium mass spectrometer leak detector can be effectively improved to ensure reliable leak detection results. In addition to the helium mass spectrometer leak detector, if you have any questions about the เครื่องตรวจจับการรั่วไหลของฮีเลียม, you can consult us at any time.