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The Model ACC22B is an economical signal conditioner which is suitable for providing low-cost linearization for the Hoffer MF Series Mini-Flowmeter.

The output frequency from the Mini-Flow Series versus flow is essentially a straight line of frequency as a function of flow rate which does not pass through zero. Left uncorrected, this will result in a K-Factor which varies with flow rate.

The ACC22B will compensate for the frequency offset characteristics of the Mini-Flowmeters, by using the method of offset frequency injection. Offset frequency injection is implemented electronically by adding a signal equal to the offset frequency required to linearize the output of the Mini-Flowmeter. This effectively shifts the output characteristic to that of the desired ideal. A low-flow cutout feature is provided where the offset signal is inhibited during no flow to prevent false outputs from being generated.