GUIDE TO THE CALIBRATION OF HYDRAULIC TORQUE WRENCHES

S. Hassan, D. Howorek, D. Peschel

Abstract

This paper describes the new proposal of the calibration of hydraulic torque wrenches. The calibration includes the different metrological effects of the hydraulic torque wrenches like repeatability, reproducibility, and the piston position. A sensitivity analysis is introduced to the different uncertainty contributions of the of hydraulic torque wrenches like the piston position, mounting position and the mechanical adaptation. The measurements show that the piston position has the significant influence on the measurement uncertainty of the calibration result. The uncertainty evaluation of the calibration facility is introduced including the effect of the lateral forces that comes from the application of relatively high torque values with short lever arm lengths. The estimation of the measurement results and the corresponding uncertainty are performed like the calibration standard ISO DIN 51309 without the estimation of the hysteresis. The calibration method and the corresponding validation are accepted from the German DAkkS accreditation body.

Keywords

hydraulic torque wrench; torque; calibration

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IMEKO-TC3-2022-102.pdf

DOI

10.21014/tc3-2022.102

IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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