Use of the read head even in extremely harsh environments

The read heads CEM have an extremely robust design. The high degree of protection IP 67 and the metal housing allow the read head to be used in extremely harsh environments. The armature plate for the CEM actuator has spring mountings and can be tilted up to an angle of ± 4°. Therefore, when a maladjusted safety door is closed, the CEM actuator adjusts itself independently to the surface of the CEM read head. It is not necessary to readjust the safety door when using the read heads CEM. When mounting the read head CEM, it is only necessary to ensure that the CEM actuator is guided in front of the CEM read head when the door is closed, so that the strong adhesive forces can be generated.

Because the read head has only a small number of moving parts which can wear, the mechanical life of the CEM read heads is virtually unlimited.

Different versions

EUCHNER provides two CEM housing designs. The two versions differ in their dimensions, according to the size of the solenoid. The safety switch CEM with a locking force of 1000 N is used with large, heavy safety doors. This read head has an additional M8 plug connector for the connection of an external LED display. When voltage is applied to the coil, it is indicated to the user that the safety door is in the locking position. In particular on large, solid doors an indicator in the immediate vicinity of the door handle is an advantage.

The smaller version of the read head CEM has a locking force of approx. 500 N. It is suitable for securing smaller safety doors and safety flaps.

An LED indicator in the M8 male socket on the read head indicates to the user when voltage is applied to the solenoid.

With or without remanence

In particular during metal machining, the residual magnetism (remanence) in the guard locking solenoid can cause problems. In the open state, metal chips may be drawn to the contact area. The next time the guard is closed, there will be a gap between the actuator and read head that will limit the locking force. To avoid this effect there are read heads without remanence. These are de-magnetized when the safety guard is opened such that metal chips adhering to the surface fall off.

Adjustable adhesive force

This version has an adhesive force also with the guard locking switched off. In this way it is intended, e. g., to prevent the safety door opening due to vibration or similar. The adhesive force can be adjusted using a parameter setting plug to 30 N, 50 N or 80 N. 

Your advantages

• Safety switch with transponder coding
• Every actuator is unique
• Maximum protection against tampering
• Integrated solenoid for process protection
• Unintentional opening of the safety door is prevented
• Safety switch and solenoid form a compact unit
• High solenoid locking forces (500 N or 1000 N)
• Protection of the machining process
• Simple operating principle
• No wearing parts
• Robust housing for harsh environments
• Connection via M8 plug connector
• Low wiring effort
• Easy to replace if servicing is required
• Approved by employers' liability insurance association and UL (Canada and USA)

Important: the device is only allowed to be used there for guard locking if there is no hazard due to overtravelling machine movements. The guard locking is only used for process protection.