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The Max Machinery, Model 286 and Model 294 frequency transmitters area available with a 2 phase, quadrature output which can be used to monitor flow direction. In combination with the Model 121, microprocessor based indicator, any of Max's 11 sizes of flow meters can create bi-directional flow metering systems for cylinder testing, bi-directional liquid transfer and brake system testing.

The key to bidirectional measurement lies in the Max transmitter's high resolution output (up to 1000 pulses per revolution) and the ability of the Max flow meters to operate well below 1 RPM. These capabilities make it possible to do "near zero" flow measurement and accurate zero crossing without cross over valves or dual meters.