The skid supplies chlorine dioxide to the rail at a pressure of 70psi and a maximum flow of 15gpm. This is accomplished by an air operated diaphragm pump (80-90psi @ 20SCFM air supply). When an injection point is turned on the motorized flow control ball valve opens and the flow is monitored via a flow sensor. The flow is analyzed by an algorithm in the PLC and compared to the calculated requirement which is fed to a PID (proportional integral derivative) loop to output a signal to the motorized ball valve in order to maintain the proper dosage. The accuracy of this is +/- 2% of calculated dosage. Multiple injection points can be operated as long as the total does not exceed 15gpm of flow. This equates to being able to treat 4 ferms, 2 props and the CIP loop simultaneously. Over and under flow are alarms that will prevent the machine from applying to much or too little chlorine dioxide to an application point and will provide an alarm notification if either of these occur.
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