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fb8_4 - PROBLEM 8.4 KNOWN A WheatStonc bridge and RTD as...

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Unformatted text preview: PROBLEM 8.4 KNOWN: A WheatStonc bridge and RTD as shown in Figun: 8.35. with a = 0.003925%?1 R. = 25 Q at 0°C R1 = 41 -485 Q for balanced conditions FIND: a) The temperamrc of the RTD b) Compare the static sensitivity of this circuit to the circuit in Example 8.2 SOLUTION: At balanced conditions R2 R. 3 R. andwhcn R. =4].485(2 41.485 1 = = R‘ = 41.435 (2 R. Fr0m R=R.[I+a(T-T.,)] 41435: 2511+0,003925(T-0)] we find 25 0.003925 b) The static sensitivities an: lhc same. since R = R] (R3/Rz) and R2 = R3 in both cases. 41.485 1 T: and T= 168°C ...
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