G - Physics – 01 – K
Patent
G - Physics
01
K
354/29
G01K 7/20 (2006.01) G01K 17/10 (2006.01) G01R 19/32 (2006.01)
Patent
CA 1213672
Abstract An apparatus for detecting a temperature by means of at least one temmerature-responsive sensing resistor (F1,F2) comprise an evaluating circuit which processes a voltage drop depending on the temperature of the sensing resistor. The sensing resistor (F1,F2) lies at a common current source (1) in series with two fixed calibration resistors (G, D). The basic resistor (G) has a lower calibration value (Rel) which is assumed by the sensing resistor at a predetermined lower temperature. The differential resistor (D) has a differential calibration value (Rd) of such a size that the series circuit of the calibration resistors has an upper calibration value (Re2) which the sensing resistor assume at a predetermined higher temperature. The evaluating circuit determines the actual temperature from at least one measurement voltage drop (Vfl, Vf2) with regard to a characteristic calibration curve resulting from at least one calibration value (Rel, Re2, Rd) and the associated calibration voltage drop (Vel, Ve2, Vd). This leads to a very simply constructed apparatus which is easily adjustable. Fig. 1.
461899
Aagaard Kjeld
Jorgensen Iver
Danfoss A/s
Macrae & Co.
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