Flowmeter correction circuit

Details Flowmeter correction circuit Flowmeter correction circuit

H - Electricity

03

K

73/168

H03K 3/64 (2006.01) G01F 1/05 (2006.01) G01F 15/02 (2006.01) G01F 15/04 (2006.01) H03K 3/72 (2006.01)

Patent

CA 1066089

A B S T R A C T A correction circuit for correcting the frequency of the output pulses produced by a gas flowmeter in dependence on the temperature of the gas comprises a control input for receiving a voltage representative of he difference between the temperature of the gas and a reference temperature. A voltage-controlled oscillator, operative during fixed short periods initiated by each flowmeter pulse, produces auxiliary pulses at a rate dependent on the voltage at the control input, and the auxiliary pulses are counted in a counter. Each time the counter counts a predetermined number of auxiliary pulses, it produces a signal which either blocks one flowmeter pulse or adds and additional pulse to the flowmeter pulses, in dependence on the polarity of the temperature difference.

262610

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