Dosing system for clearer vision

A partnership between Bronkhorst and the contact lens manufacturer developed a tween-solution dosing system that ensured both complete mixing and a highly accurate and repeatable dosing rate even with a variable main water flow.

This ensured that a uniform and strictly controlled concentration of the cleaning agent is applied to the process machinery after each production run.

This, in turn, ensured the integrity of every production run, surpassing each quality inspection, while fulfilling the needs of the consumer.

Having identified a number of options, the team determined that the best solution for global implementation was the design of a compact system ideally configured to simply retro-fit onto the existing production machine.

All wetted parts needed to be 316 stainless steel and the liquid process connections needed to be Tri-Clamp. Further discussions culminated in the decision to utilise Coriolis Technology further enhanced by Master/Slave ratio control.

The main, variable, water flow is measured by the Master Coriolis Meter and an output signal sent to the Slave.

The slave consists of a Coriolis Flow Controller with the control device being a close-coupled pump.

Using the built-in PID function of the instruments and the Bronkhorst FLOWBUS communications protocol resulted in a small network within which the instruments worked in unison.

A single dosage rate command meant that the operator could simply, and in real-time, adjust the dosing ratio as set by the process requirements for that day or even for that “run”.

All the necessary parts were supplied and fitted, including valves, filters, connectors, a static mixer and the stainless steel housing. In doing so the cabinet was virtually “plug and play” thereby minimising time and cost for installation.

For more information, please contact:  sales@bronkhorst.co.uk, or call: +44 (0)1223 833222