Manufacturing News

Safety switch for harsh environments

TREOTHAM Automation has introduced the Euchner non-contact safety solenoid switch CET with die-cast housing, for use in harsh environments.

This safety switch has guard locking and guard lock monitoring, integrated transponder coding, and high locking forces up to 5000N.

Advantages include suitability for use on heavy doors, high protection against tampering, an actuator with large freedom of movement, no need for precise door adjustment, low wiring requirement, and IP67 protection.

The guard locking system is based on a proven transponder principle, so the technology is also used in the non-contact Euchner safety switches CES.

When closing a safety guard (hinged door sliding door), the product’s spring-loaded transponder in the actuator is inserted into the cavity of the safety switch.

A read head integrated into the switch detects the closed safety guard in its locked position. The CES evaluation system enables the safety circuit when the safety guard is locked.

When the moving parts and machine come to a standstill, a solenoid integrated into the switch is activated by safe standstill monitor or by a timer relay.

The plunger of the magnet then raises the spring-loaded transponder which allows the safety guard to be opened.

In manufacturing and processing industries, these electromagnetic devices interlock movable safety guards so that dangerous work on machines can only be carried out if the safety guard is closed and locked. The safety guard cannot be opened when machine is running.

For the control system, this means the starting demands which cause hazardous situations must become active only when the safety guard is in protective position and the guard locking is in ‘locked’ position.

Treotham Automation 02 9907 1788.

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