TEMPERATURE CHAMBER FOR CALIBRATION OF TEMPERATURE SENSOR DS18B20 DESIGN

Measurement is a series of activities aimed at determining the value of a quantity in the form of numbers (quantitative) (Chan, 2011). In the process of measuring the measuring instrument used for measurement is certainly an accurate measurement in a measurement so that the data obtained in accordance with conditions in the field. A measuring instrument if used for a long time or many times without stopping can affect the accuracy of the data from the measuring instrument. The measurement results are less stable due to measuring instruments used for a long time and are continuously influenced by various things such as environmental influences, temperatures, the influence of tool components and others. the conventional truth of the value indicated by a measuring instrument (Chan, 2011).

The author tries to design a measuring instrument. The sensor used is the arduino uno-based DS18B20 sensor. DS18B20 functions as a temperature reader ... The design of the software used is C language. To calibrate the design results, a device called the temperature chamber is used.

 The purpose of calibration is to find out the level of accuracy of the tools that are designed with standard tools. The temperature calibration process is carried out at several set points as sample points. The set point chosen is 10 oC, 20 oC, 30 oC, and 40 oC. Calibration is done by the comparison method where the sensor to be tested is placed side by side with a standard sensor in a place called a chamber. After that the temperature value is repeated reading at each set point. The tolerance value determined by the World Meteorogical Organization (WMO) is ± 0.3 oC. Example of calibration results: For set point (oC) 10, 20, 30, 40., having a standard deviation is 0.39; 012; 0.00; and 0.00

The DS18B20 sensor calibration results with the temperature chamber obtained the highest standard deviation value is 0.39 oC at 10 oC det point. At the set point of 20 oC, 30 oC and 40 oC according to the tolerance value of the World Meteorogical Organization (WMO) is ± 0.3 oC, the accuracy rate of this design tool is 75%,