Resistance Temperature Detector (RTD) Questions 

Calculate the voltage across the bridge (V_AB) at the following RTD temperatures, assuming a 604 Ω nickel-iron RTD with an alpha value of 0.00518:

• T = 0 oC ; VAB = _____ millivolts
• T = 81 oC ; VAB = _____ millivolts
• T = -45 oC ; VAB = _____ millivolts
• T = 320 oF ; VAB = _____ millivolts

Answer :

All answers shown here based on tabulated values for the RTD’s resistance (rather than values calculated by formula):

• T = 0 oC ; VAB = -0.6989 millivolts
• T = 81 oC ; VAB = 0.9568 millivolts
• T = -45 oC ; VAB = -1.6215 millivolts
• T = 320 oF ; VAB = 2.4831 millivolts