Electronic Theses and Dissertation

Penelitian ini bertujuan untuk mengidentifikasi suhu dan gradien suhu menggunakan instrumen needle probe dikawasan yang jauh dan dekat dari sumber panas. pengukuran dilakukan menggunakan sensor suhu lm35 yang terpasang pada instrumen needle probe dengan masing-masing jarak 0,5 m untuk setiap sensor. hasil pengukuran menunjukkan bahwa kawasan yang jauh dari sumber panas memiliki kisaran nilai suhu pada sensor 1 sebesar 25 oc sampai 31 oc, pada sensor 2 sebesar 23 oc sampai 30 oc, pada sensor 3 sebesar 22 oc sampai 29 oc dan pada sensor 4 sebesar 21 oc sampai 28 oc.terjadi penurunan suhu di kawasan jauh dari sumber panas yang disebabkan sumber panas dikawasan tersebut hanya dipengaruhi oleh suhu disekitar lokasi penelitian, dengan nilai gradien suhu sebesar -1,25 oc/m. sedangkan pada kawasan dekat sumber panas memiliki kisaran nilai suhu pada sensor 1 sebesar 32 oc sampai 39 oc, pada sensor 2 sebesar 41 oc sampai 46 oc, pada sensor 3 sebesar 50 oc sampai 56 oc dan pada sensor 4 sebesar 56 oc sampai 63 oc. terjadi kenaikan suhu pada kawasan dekat sumber panas dengan nilai gradien suhu sebesar 8,17 oc/m yang disebabkan karena adanya manifestasi panas bumi di kawasan dekat sumber panas berupa mata air panas. pada kawasan dekat sumber panas, semakin bertambahnya kedalaman dibawah permukaan maka suhu meningkat. sedangkan pada kawasan jauh dari sumber panas semakin bertambahnya kedalaman di bawah permukaan maka suhu menurun. needle probe dapat bekerja dengan baik pada saat pengambilan data di kawasan jauh dari sumber panas dan dekat sumber panas ditandai dengan parameter suhu dapat teridentifikasi berupa suhu dan gradien suhu. kata kunci: suhu, gradien suhu, needle probe.

This study aimed to identify the temperatures and temperature gradients using a needle probe as the instrument in the area far from and in the area near with a heat source. The measurements were made using an LM35 temperature sensor attached to the needle probe with a distance of 0.5 m between each sensor. The measurement results showed that the areas far from the heat source had temperature ranges of 25 oC to 31 oC for sensor 1, 23 oC to 30 oC for sensor 2, 22 oC to 29 oC for sensor 3, and 21 oC to 28 oC for sensor 4. The deeper the sensor was situated, the lower the temperature range was shown by the sensor. The temperature gradient was -1.25 oC/m. in the area near the heat source, the temperature range of 32 oC to 39 oC was shown by sensor 1, and the temperature range of 41 oC to 46 oC was shown by sensor 2. In addition, the temperature range of 50 oC to 56 oC was shown by sensor 3, and the temperature range of 56 oC to 63 oC was shown by sensor 4. There was an increase in the temperature ranges as the sensor was situated deeper in the area near with the heat source. The temperature gradient was 8.17 oC/m. the increase in the temperature ranges was due to geothermal manifestations in the area near the heat source in the form of a hot spring. In the are near the heat source, the temperature was higher as the sensor was situated deeper from the surface. Meanwhile, in the are far form the heat source, as the sensor was located deeper, the temperature became lower. Needle probe worked well when the data were collected both in the area far form the heat source and in the area near the heat source since the temperature parameters in the form of temperatures and temperature gradients were identifiable. Keywords: Temperature, Temperature Gradients, Needle Probe.