Process indicators analyse and measure the pressure, flow, temperature and other parameters for safe production operating conditions and for maintaining product quality. These process indicator devices comprise of a sensor, integrated software and sometimes have input terminals.
Process indicators are even capable of tracking different variables. A system can stop a machine to minimise expensive overruns and improve operator efficiency. The process monitors the operation between set variables. Programmable tolerances, downtime analysis, process deviation indicators and mode indication status are also commonly available.
Some features of process indicators
Features of process indicators include:
• Historical error logging
• Revolutions per minute (RPM) tracking
• Supervisor lock-out option
• Shop floor data entry
Process indicators are widely used in many different industries and applications. For instance, liquid and semiconductor crystal process monitors are used for enhancing the yield of film fabrication and etching processes. These devices also monitor other parameters like trench depth, plasma levels and film thickness.
Thin film process monitors are mostly used for controlling composition or deposition rates in thin film processing. Some products use ellipso-meters, spectrometers and quartz crystal microbalances. Chemical process monitors can also be used for managing the flow from control valves and feed pumps. They can also be used for determining chemical concentrations in storage tanks.