Measuring and testing – Volume or rate of flow – Thermal type
Patent
1997-04-02
1999-08-10
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Thermal type
732025, 7320417, 7320423, 7320427, G01F 168
Patent
active
059361565
ABSTRACT:
A meter to measure the volumetric flow rate of a liquid, for example water, is formed with a pipe forming a liquid flow path containing a low power electrical heater. A first temperature sensor measures the temperature T of the liquid adjacent to an upstream end of the heater and a second temperature sensor measures the temperature T.sub.2 of the liquid adjacent to a downstream end of the heater. The heater adds heat power of a value P to the liquid. A control arrangement comprising a computer means calculates the flow rate Q using the expression ##EQU1## where ST.sub.1 and DT.sub.1 are respectively the specific heat capacity of the liquid and the density of the liquid at the temperature T.sub.1 measured by the first sensor.
REFERENCES:
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patent: 5285673 (1994-02-01), Drexel et al.
"A Calibration System for Calorimetric Mass Flow Devices", Widmer et al, J. Phys. E. Sci. Instrum., vol. 15, 1982, Great Britain.
Patent Abstracts of Japan, Pub. No. 57120816, Jul. 28, 1982, Tatsuo et al, "Heat Ray Pulse Flowmeter".
Patent Abstracts of Japan, Pub. No. 63015120, Jan. 22, 1988, Shinji et al, "Flow Rate Measuring Apparatus".
Cole Andrew Jonathan
Price Barry Leonard
Roberts Graham Richard
British Gas plc
Chilcot Richard
McCall Eric S.
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