Prototype of low temperature sensor based on Coils-Resistance Temperature Detector (C-RTD) has been made. The objective of this research was to find the most optimum of wire diameter and number of windings as C-RTD sensor in responding the changes of low temperature medium. Sample consist of copper wire where diameter was varied from 0.1 to 0.3 mm, and number of windings was varied from 100 to 500. Liquid nitrogen was used as low temperature medium that by direct evaporation to free air, temperature is possible to be set from-140C up to 0C. Three-Wire Configuration Bridge (3-WCB) was used as transducer to facilitates the output voltage at both ends of the sensor. The set temperature (T) and voltage (V) data were fitted according to second order polynomial. The goodness 1352 Moh. Toifur et al. of samples was investigated through two parameters i.e. from determination index of curve, enrolling the consistency between voltage and temperature relationship, and from slope of curves enrolling sensitivity level of sensor in responding the change of medium temperature. For completeness of analysis of goodness of curve it was given the reduced chi-square 2 v and it probability P( 2 ;). The results showed that from determination index, it was known that all samples were stable in responding the temperature change. From slope of curve, it was known that coil 0.3 mm diameter and 200 windings has a highest sensitivity level that is 1mV/C. The sample have 2 v = 0.8757 and P( 2 ;)=0.4817. The relationship between temperature (T) and voltage (V) was shown by equation V =-7E-06T 2 + 0.001T + 0.9246. The sample has a potential to be improved as element of low temperature sensor equipment.
Low Temperature Detection System on cow cement flask base on RTD-coil coupled by transducer 4-WCB has been made. Four kinds of sensor was prepared, that's are coils from copper material with diameter 1 mm and set number of winding from 200 up to 500. Four-WCB circuit was chosen as transducer to facilitate the output voltage and to avoid the self heating on a wire directly connected with sensor. Liquid nitrogen is used as medium which its temperature will be measured. Temperature of medium was varied from -130C up to 0C. Collecting data was done on temperature and output voltage and output voltage was taken on each rising temperature of medium. Data temperature-voltage was analyzed by curve fitting according to quadratic polynomial y = ax 2 +bx+c. Sensitivity level of sensor was determined from slope of graphics, whereas the level of stability of sensor was determined from standard deviation. From plot of temperature -voltage data, it is known that all of sensors consistently tend to follow polynomial orde-2 form. It is found that sensor with the number of windings 400 is the most sensitive, but less stable compared with sensor 200 windings. Equation for potential (V) as function of temperature (T) concerning with sensor 400 windings is V = -0.00003T 2 + 0.32T + 77.09. This sensor has sensitivity and stability levels are 0,32 mV/C and R 2 = 0,99 respectively.
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