Calibration method for vacuum cleaner air performance testing equipment: ensure accurate data

　　Vacuum cleaner air performance testing equipmentThe detection data of instruments such as anemometers and negative pressure gauges directly determine whether the product meets the requirements of national standards (such as GB/T 1019-2021), and regular calibration is the core link to ensure data accuracy, which requires adherence to standardized procedures.

Preparation before calibration is the foundation. Firstly, it is necessary to confirm the calibration environment: temperature control at (23 ± 5) ℃, relative humidity ≤ 85%, avoid airflow interference (such as staying away from ventilation openings), and prevent environmental factors from affecting sensor sensitivity. Secondly, prepare standard instruments such as certified standard air volume devices and high-precision pressure sensors, and ensure that the accuracy of the standard instruments is one level higher than that of the calibrated equipment (if the accuracy of the calibrated equipment is ± 2%, the standard instruments need to reach ± 1%). At the same time, check the appearance of the equipment to ensure that the connecting pipelines are not damaged and the interfaces are not leaking.

The core calibration steps need to be implemented by indicators. For the air volume detection module, first connect the calibrated equipment in series with the standard air volume device, and test at 5 different air volume points (covering 20-100% of the equipment range). Record the deviation between the displayed value of the calibrated equipment and the standard value. If the deviation exceeds the allowable range (usually ≤± 2%), adjust the coefficient through the equipment calibration menu until the deviation is qualified for 3 consecutive tests. For the negative pressure detection module, a standard pressure source is used to apply pressure to the equipment, gradually increasing from 0Pa to full range. Each pressure point is held for 30 seconds, and the readings are compared. If there is a deviation, the zero point and range of the pressure sensor need to be calibrated to ensure that the error is controlled within ± 1% FS. In addition, sealing calibration cannot be ignored. Block the air inlet of the equipment with a sealing plug, observe the negative pressure change after starting the equipment, and the negative pressure drop within 1 minute should be ≤ 5% of the initial value. Otherwise, the sealing gasket needs to be replaced or the air circuit needs to be inspected.

Verification and recording after calibration are equally crucial. After calibration is completed, two intermediate range points need to be selected for retesting to confirm data stability. At the same time, detailed records of calibration dates, environmental parameters, standard instrument information, pre - and post calibration data, and adjustment measures should be kept to form a calibration report. The recommended calibration cycle is 6 months, and if the equipment is frequently used or in harsh environments, it should be shortened to 3 months.

By following a standardized calibration process, it is possible to effectively avoid issues caused byVacuum cleaner air performance testing equipmentThe detection error caused by drift ensures the authenticity and reliability of performance indicators such as air volume and negative pressure of the vacuum cleaner, providing accurate basis for product quality control.