Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1982-09-27
1985-04-30
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Thermal type
73313, 364509, 364571, G01F 2324, G01K 716
Patent
active
045136165
ABSTRACT:
A hot-wire level detecting apparatus includes a micro-processor which registers a look-up table of digital level values associated with digital values of a differential parameter representing the change in the voltage or current in the hot-wire probe. The micro-processor controls a switch for initiating the application of power to the probe. In one embodiment a constant voltage supply is connected across the emitter and collector of a transistor with the probe in the emitter circuit and a resistor in the collector circuit. The voltage across the resistor, measured at switch-on and after a period for stabilization, is fed to the micro-processor by an analog-digital converter.
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Bezard Jean-Jacques
Jourdain Charles H.
Lalanne Bruno
J A E G E R
Yasich Daniel M.
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