How to determine whether the detection result of helium mass spectrometer is accurate?

The first conclusion: To determine whether the helium mass spectrometer leak detector is accurate, mainly depends on the built-in standard leak hole, and whether the environment is suitable, such as the temperature change of 1℃, the standard leak hole leakage rate has more than 3% error.

Many users have misconceptions when using helium mass spectrometer leak detectors. They would think that as long as the leak detector can pass the self-test, the helium mass spectrometry leak detector is normal. The fact that the leak detector can pass a self-test just shows that the leak detector itself is basically fine. But is the leak detector accurate? It’s not certain.

Helium mass spectrometry leak detector is widely used. With the progress of science and technology, the requirements for scientific research equipment are more and more stringent; The improvement of production technology has higher requirements on the performance of production line. With the development of chemical enterprises, the tightness of pipelines is directly related to safety; The tightness of power plant pipeline is directly related to energy saving. All of these require the use of helium mass spectrometer leak detector to complete the detection task. Therefore, it is important to ensure the accuracy of the helium mass spectrometer leak detector.

Therefore, in order to ensure the accuracy of the detection results of the helium mass spectrometry leak detector, it is necessary to ensure the accuracy of the built-in standard leak hole, then how to ensure the accuracy of the built-in standard leak hole?

First of all, the standard leak itself should meet the relevant quality requirements. Standard leaky holes can bring their own third-party test certificates. Standard leakages should be verified by a third party qualified for standard leakages verification to ensure that the standard leakages themselves are not problematic.

Second, standards should be checked and calibrated frequently for loopholes. Annual calibration is recommended. In particular, standard vulnerabilities with high annual leakage rates should be paid attention to and calibrated frequently. If anomalies are found, calibrate using external leaky holes.

Third, pay attention to the environment. The standard leakages for production and testing are carried out at 20-25℃ at room temperature. In particular, some standard leakages are particularly sensitive to temperature. When the temperature changes by 1℃, the standard leakage rate has an error of more than 3%.

To sum up, if the helium mass spectrometry leak detector wants to use well and have high accuracy, it must use the standard leak hole correctly.

So why can the helium mass spectrometer leak detector pass the self-test, but the accuracy of the leak detector is not certain?

The self-test of helium mass spectrometry leak detector is mainly the software and hardware of the leak detector itself. Whether the surrounding environment is suitable for using a leak detector. The accuracy of a helium mass spectrometer leak detector depends on the built-in standard leak hole. The standard leak hole is a scale to measure whether the helium mass spectrometry leak detector is accurate. If the standard leak hole is not accurate, that is, the detection scale is not accurate, and the final test result is not accurate.