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Optimisation of Performance Parameters for High Precision Automated Mass Comparators

Abstract: Modern day high precision mass comparators are high-tech measuring instruments that are capable of automated operations. The convenience of automation however introduces a number of ‘time based’ influencing parameters that affects the performance of the mass comparators to obtain accurate and repeatable readings. This paper highlights a recent study carried out on the ‘time based’ performance parameters of the a5 and a100 Mettler-Toledo automated weighing comparators housed in SPRING Singapore. The parameters under investigation were the integration time and stabilization time of the comparators, the number of pre-weighing, and the number of actual weighing where the calibration results were obtained. The length of the setting time for each parameter would affect the overall operating time. A set of experiments covering different settings were designed to investigate extensively the effects the setting combinations had on the repeatability performance of the mass comparators. Typical experimental results indicated that the number of weighing, stabilization and integration times do affect the performance of each balance. However, there is a trade-off between the improvement in performance and operation time required. An optimal range of settings can be identified through experiments to maximise the mass comparator efficiency and ensure optimal repeatability in the shortest possible weighing time.