Device for the measurement of parameters vera end of the present invention by means of a conduit system pouring

摘要

1,249,373. Measuring fluid parameters electrically. AMERICAN STANDARD Inc. July 1, 1969 [July 19, 1968], No. 33266/69. Heading G1N. A parameter of a fluid flowing in a conduit e. g. rate of flow or turbulance is measured by the temperature and resistance of a heated thermistor whose signal/frequency characteristic is linearized by networks with compensating characteristics over a desired frequency range. The temperature probe P Fig. 2 comprising a thermistor 10 encapsulated in glass 14 and held in tubes 25, 20, 13 is fed with constant current by a transistor Q1 Fig. 5, the voltage across the probe, representing its temperature and hence the rate of flow or turbulence of a fluid, being fed through amplifying transistors Q2, Q3 arranged in networks to compensate for the falling frequency characteristic of the thermistor.