Kalibrasi Temperature Gauge Menggunakan Oil Bath Temperature Calibrator CTB9500 Pada Industri Kilang

Abstract

This study aims to analyze the calibration performance of temperature gauges using a WIKA CTB9500 oil bath calibrator—which features a stability of ±0.05°C and an accuracy of ±0.3°C—to improve temperature measurement accuracy in refinery processes. An experimental approach was employed, involving the calibration of 45 temperature gauge units from various brands with a measurement range of 0–60°C. The calibration process utilized a pre-cycle method at 0°C and 60°C, followed by testing in the sequence: 20°C → 30°C → 40°C → 30°C → 20°C. The calibration data were analyzed to determine error, hysteresis, and repeatability, with a pass criterion of a ±1°C tolerance. The results indicate that the CTB9500 was able to detect an average measurement error of 2.1°C in the "as-found" condition. Statistical analysis shows that 82% of the instruments met the ±1°C tolerance after calibration, while 18% were deemed unfit for further use (scrapped). Instruments in service for more than two years exhibited a drift of 0.38°C per month