Measure and monitor
Processes that produce large and variable amounts of waste can often benefit from improved process control. The first step is to identify the parameters affecting the amount of waste. An effective process control system typically consists of a method of measuring key parameters, with a controller and a control device (eg a valve) linked in a feedback loop. The controller can range from manual monitoring to a fully automated system.
Common types of process control system include:
- manual methods such as control charts and visual checks (eg adjusting a valve after reading a level indicator), which require staff training to follow the control procedures (see publications GG223 and GG224)
- simple feedback systems, eg a direct relationship between the monitoring of key parameters and their effect on a control device (see publications GG223 and GG224)
- computer controllers, where monitoring data are processed before controls are adjusted (eg publication GC023)
- Have a look at the Case study featuring SCA packaging (CS356)
