Cleanroom doors and airlock systems are crucial for safety and cleanliness in any cleanroom. Whether personnel airlock, material pass-trhough or airlock – mutually interlocked doors prevent particles or uncontrolled air flows from endangering the sensitive environment. A color system on the airlock doors provides clear guidance: signals in red, green and blue immediately indicate when safe access is possible.
Why airlock doors in the cleanroom must never be open at the same time
The most important principle in any regular operation of a cleanroom system is that both airlock doors must never be open at the same time. This is because as soon as outside air flows into the cleanroom, the risk of particle contamination and pressure drops increases.
To prevent this from happening, cleanroom doors in airlocks are technically interlocked:
- Only when one door is fully closed can the other be unlocked.
- In this way, the separation between the cleanroom and the environment is guaranteed at all times.
Traffic light system on cleanroom doors: green, yellow, red, blue for safety
To ensure that employees and external visitors immediately understand which door they are allowed to use and when, our door control systems for cleanroom airlocks use a color signal system:
- 🟢 Green = Entry permitted → The door can be opened.
- 🟡 Yellow = door is currently open → the door lights up yellow for the short time it is open.
- Red = Blocked → The other door is currently open, access not possible.
The red signal also lights up if the emergency stop button has been pressed or if a door has been open for too long. - 🔵 Blue = airlock in purge → Wait briefly. Both doors are locked at the same time while the air is automatically filtered.
The
Conclusion: Cleanroom doors with color system increase safety and efficiency
The color system on interlock doors makes complex technology easy for people to understand.
The combination of door interlock, traffic light signals and interlock flushing reliably prevents cleanroom doors from being opened simultaneously and uncontrolled air from entering the cleanroom. Safety is guaranteed at all times – the interlock control system can be overridden by activating the emergency stop for rescue and escape purposes
This makes
SCHILLING ENGINEERING plans and supplies customized airlock systems with intelligent control technology.
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