G - Physics – 01 – P
Patent
G - Physics
01
P
73/74
G01P 5/12 (2006.01) G01F 1/684 (2006.01) G01F 1/698 (2006.01) G01P 13/00 (2006.01) G01R 17/10 (2006.01)
Patent
CA 1044037
A B S T R A C T A calorimetric flow monitor comprising a measuring head adapted to be connectable to a pipe carrying a flow medium. The measuring head includes two thermistors, one of which is surrounded by a heating coil to be heated thereby, The unheated thermistor and the heatable thermistor together with its heating coil are mounted in a pair of pins protruding from the measuring head. The thermistors are connected in an electrical bridge circuit. A first differential amplifier for determining increases and decreases in the flow of the medium relative to a preset flow is connected to the bridge circuit. Visual indicating devices are optionally provided to indicate when the flow is above and below the preset flow. A second differential amplifier for monitoring the occurrence of breakages in conductors connected to the thermistors and the heating coil, is also connected to the bridge circuit.
236995
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