Question

Liquid Level 1. You are using a 1 turn rotatory potentiometer to design a level sensor to measure liquid level on a tank. The total resistance of the potentiometer R = 10K and the output voltage that is measured by an Arduino is IV. Find the angle of turned in the potentiometer as well as the height of liquid level in the tank. 2. A platinum resistance coil is to be used as a temperature sensor (Rthermal) and has a resistance at 0°C of 100 ohm and temperature coefficient of 0.0039 K'. a. Find Vo at 40°C b. Find the temperature, if Vo - 1.85 V. 3. Assume a strain gage with gage factor (G) of 2.0 and resistance of 120 ohm. It is subjected to a strain of 5 microstrain ( (equivalent to about 50 psi in aluminum). Find changes in resistance (AR). Potentiomete L100 cm

Answer 1


Page 1 Ansis Image is not visible & question is unclear more details about input voltage of potentiometer to requer required. Also the placement of pot. is unclear. approximately taken & Ansal Image is inclear. So I have as 5V and R, at 2002. R Platinum coil. (2002) = resistance La) Por @ 0°C = 1002 ; temp.coefficient, a = 0.0039K7 Ry @ 40°C = 100 Rq (1+&AT) = 100(1+0.0039xo140-0)] = 115.62 ... - RARIO RTLO XV; 115.6 45 = 1.83V Ang 115.6 +200 (6) Criven to = 1.850 Vo = x Also, xvi SR is resistance at xe] or, 2007 Ram 2 2.703 or, 201 - 1903 FPTO

Page 2 ar, 200 1.903 or, R = 117.44 = R. (1+ROT) ov, 100 (1+0.00 39xx) = 119.44 or, a = 44.218°C Ans AR Ans37 we know, Garge factor, a = k h =D de 58106 where t=Strain RR = 1200 DR/120 6=2= 5x106 AR? 2x 5 x 10 °x120251-2 ml carries 8KN Each load cell : Total load for shared by 4 load cells = 8x4 = 32 KN por mass of empty ressel = 40kg Acid density = 1050 kg/m3 vessel diameter - Im (say d) let vessel height = Hm Acid weight = 1050x t f xH - 1050X AXI x H = 824.67H kg (ressel & And weight) & acceleration due to provity = 32x10²N -> (40+824.67H)*9.81 = 320103 & H = 3.91 m Ang