Establishment of a System for Uniformity and Stability Characterization of Liquid Calibration Bath Used Above Ambient Conditions: 50 ºC to 75 ºC Settings

Abstract

This paper aims to determine the characteristic of a Liquid Calibration Bath at above ambient temperatures using a validated method and procedure for measuring stability and uniformity. Existing method and procedure of the Metals Industry Research and Development Center were adopted and the measurements were carried out using Standard Platinum Resistance Thermometer (SPRT- Hart) and Platinum Resistance Thermometer (PRT - Isotech) which are coupled to a Digital Multimeter. Several measurements were taken at different time intervals taken on a number of identified locations in a systematic measurement pattern that covered the entire working space. Results of measurements showed that the stability of calibration bath at each temperature setting are more stable at lower temperatures and tends to increase as the temperature reaches 70 ºC. The liquid bath was more uniform at lower temperatures. A full-scale research is recommended to pursue characterization of calibration bath using other types of liquid such as Ethyl Alcohol and Silicon Oil.