Automatic solution concentration monitoring system

摘要

An improved automatic immersion coating apparatus is disclosed herein which is particularly well suited for use in applying a coating to substantially all the exposed surfaces of a workpiece without incurring any potentially damaging or wearing of the surfaces thereof. The coating apparatus is designed to allow individual workpieces to free fall into a reservoir containing a supply of the coating solution and includes a catch basket, actuation of which is carefully timed so as to enable the time during which the workpiece is immersed in the coating solution to be minimized. Additionally, apparatus is also provided whereby the coating solution is continuously recirculated and the concentration level thereof carefully monitored. This monitoring system operates to actuate metering valves whereby the solution components may be automatically replenished thus enabling the optimum concentration level to be closely maintained.