The meters are positive displacement flow meters where the passage of liquid causes two oval gears to rotate within the precision measuring chamber and with each rotation a fixed volume of liquid passes through the meter. Magnets embedded within the gears initiate a high resolution pulse train output. The pulse output can be wired directly to process control and monitoring equipment or can be used as an input to instruments supplied with or fitted directly onto the meter. The flow meter is available as a blind transmitter with pulse output capable of interfacing to most monitoring and control instrumentation, or the meter can be fitted rate totalisers and batch controllers. These instruments also have monitoring and control output options including 4-20 mA, scaled pulse, flowrate alarms and batch control logic.