Economical reliability - Electronic pressure switches in sanitary applications
By J Zipp, WIKA
Electricity + Control, September 2015 (pages 28, 29)
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Automated processes increase the process safety. Therefore they are essential for sterile production processes. They eliminate the potential for errors that inevitably exists when all routine control tasks are carried out manually. This also applies for the upstream and downstream cleaning and sterilisation processes. Thus, even simple pressure monitoring tasks are carried out electronically so that the plants can be controlled reliably – conveniently with a switch.
The control of the replenishment of ultra-pure water or sterile air is a classic example for a straightforward switching task in the supply units. Electronic pressure switches are used in such applications.
From these determining factors of reliability and economy, the requirement profile for the pressure switches is derived. They must be robust in order to survive in harsh industrial environments. Commissioning, maintenance and service operations must be uncomplicated and fast, so that plant downtime is avoided, or is, at least, reduced to the shortest possible duration.
In such applications, electronic switches with transistor switching output and an integrated digital display have proven particularly useful. There generally a limit value, e.g. for over or under-pressure or level, has to be monitored. For the connection to machine control, a binary, digital input is sufficient for this purpose.
- Often, achieving the simplest solutions requires the smartest thinking and the smartest systems.
- The best control is the simplest control – providing it is safe.
- Modern switches provide good readability, are compliant with the latest specs, and are easily incorporated into system designs.