CALIBRATION OF HYDRAULIC FORCE MACHINES – REQUIREMENTS, CONCEPTS, PROBLEMS, SOLUTIONS |
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| Boris Katz, Peter Kornhauser, Shlomi Bitas |
- Abstract:
- Modern building technologies (for example prestressed concrete to produce beams, floors, bridges, or installation, testing and monitoring of ground anchors) require the use of accurate force machines (hydraulic jacks). One component of successful building works is a correct and accurate calibration procedure of hydraulic jack for tensioning cables or anchors. This article analyzes two different calibration methods: By means of hollow load cell and thread bar and calibration in the closed frame.
We analyze these methods using different accessories and their influence on the uncertainty of calibration results. As a very important part of calibration procedure is a correct choice of the calibration mathematical model (interpolation curve force-hydraulic pressure and hydraulic pressure-force), there is a need to use a special software. Such is the developed software FORCE-401-S which permits to communicate the measurement line "load cell-amplifier-computer"; to choose the correct interpolation polynom; enable to compute the errors and uncertainty values and build the table of calibration results.
The calibration procedure is performed according to the standard ISO 7500-1 "Verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Verification and calibration of the force-measuring system". We recommend to widen the definitions of this standard and to include calibration of non-force units scaled devices (as an example pressure gauges). - Keywords:
- force calibration, interpolation, uncertainty
- Download:
- IMEKO-WC-2009-TC3-024.pdf
- DOI:
- -
- Event details
- Event name:
- XIX IMEKO World Congress
- Title:
Fundamental and Applied Metrology
- Place:
- Lisbon, PORTUGAL
- Time:
- 06 September 2009 - 11 September 2009