"Elevator speed limiter tester calibration specification" officially released

On December 12, China's first "Calibration Specification for Elevator Speed ​​Limiter Tester" was formally issued. This calibration specification concerning the safe operation of elevators will be implemented on March 12, 2013.

Beijing Municipal Institute of Metrology and Detection (hereinafter referred to as the Beijing Metrology Institute), director of the speed room, and Yu Baoliang, one of the main drafters of the code, started research on relevant research and specifications in 2006. The elevator speed limiter is one of the important components of elevator operation safety protection. Because of the chain control measures of the elevator speed limiter and other components, the safe operation of the elevator is ensured. “When the speed of the elevator exceeds a certain value of the rated speed, the speed limiter can cut off the safety circuit or further cause the safety gear or the upward overspeed protection device to work, so that the elevator decelerates until it stops.” Yu Baoliang said, speed limiter action speed The on-site measurement is a mandatory item for elevator safety inspection. The elevator speed limiter tester is a daily measuring instrument used to detect the speed of the elevator governor. The instrument has a wide range of applications in elevator manufacturing, repair, special equipment testing and other industries.

The elevator speed limiter tester is small and almost the same size as an ordinary laptop. The calibration specification states that the elevator speed limiter tester is capable of driving the elevator overspeed governor wheel rotation, real-time measurement of the overspeed governor wheel speed, and can automatically capture the speed limiter's electrical contact switch action speed and print or store The measuring instrument for the speed value is mainly composed of a host, a drive motor, and a speed sensor.

“Whether the speed limiter can prevent the occurrence of an elevator bottom accident at a critical moment to ensure the safe operation of the elevator requires the tester to accurately detect it. However, if the test meter itself is not calibrated, then of course the speed limit cannot be reached. The device performs accurate detection. Therefore, the accuracy of the tester itself must first be ensured. This calibration specification was developed for the calibration of the tester.” Yu Baoliang explained that at present, although there are some local metrology and technical institutions to implement elevator speed limit Instrument tester calibration, but the calibration methods are uneven. In order to ensure the accuracy and reliability of the traceability of elevator overspeed governor testers, it is necessary to formulate a nationwide “calibration specification for elevator overspeed governor testers”.

The "elevator speed limiter tester calibration specification" is a newly-developed technical specification and does not have corresponding international recommendations, international documents or international standards. In May 2006, after the Beijing Special Equipment Testing Center proposed the traceability requirements of the elevator speed limiter tester to the Beijing Metrology Institute, the team led by Yu Baoliang cooperated with Beijing Lantian Yuyou Technology Co., Ltd. to start the lift limit. Research on Calibrator and Calibration Method for Speed ​​Tester. After more than one year of research, a calibration device for the elevator governor tester was developed, and the calibration method and uncertainty evaluation were completed. Then, Beijing Metrology Institute began to carry out calibration services for the elevator overspeed governor tester. After summarizing the experience of elevator overspeed tester calibration service for over one year, in 2009, the Beijing Metrology Institute submitted an application for the “Calibration Specification for Elevator Overspeed Tester” to the national vibration impact velocity measurement technical committee.