CSS34 Magnetic Safety Sensor

Key Features

  • Thermoplastic enclosure
  • Electronic contact-free, coded system
  • Misaligned actuation possible
  • 27 mm x 108.2 mm x 35 mm
  • High repeat accuracy of the switching points
  • Max. length of the sensor chain 200 m
  • 2 short-circuit proof PNP safety outputs
  • Integral cross-short, wire-breakage and external voltage monitoring of the safety cables up to the control cabinet
Part Numbers

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The CSS 34 non-contact, electronic safety sensor is designed for application in safety circuits and is used for monitoring the position of movable safety guards. In this application the safety sensor monitors the closed position of hinged, sliding or removable guards with the aid of a coded actuator.

The CSS 34 Safety Sensor fulfills the requirements for proximity devices with defined behavior under fault conditions according to EN 60947-5-3 with the classification PDF-M (self-monitoring).

The CSS 34 Safety Sensor and CST 34 actuator are a matched pair. As the actuator approaches the sensor, the sensor excites the actuator at a predetermined resonant frequency and the reads back the actuator oscillation. The sensor evaluates the actuator frequency and its distance to the actuator.

Identification of the actuator is interpreted as a closed guard by the safety sensor, and the safety outputs are enabled.

The safety sensor is a dual channel design with two shortcircuit proof, safe PNP outputs, each of which can switch up to 250 mA. Due to continuous internal function tests and the monitoring of the safety outputs, up to 31 CSS 34 Safety Sensors can be wired in series without detriment to the safety performance level/control category (PLe per EN ISO 13849-1, control category 4 per EN 954-1).

The models CSS34 F0/F1 have an integrated feedback option that control positive-guided contactors/relays without the need for a downstream safety control module. The integrated start/restart interlock feature provides an input for a reset pushbutton with edge detection, or without edge detection (suitable for automatic reset). The CSS34F0/F1 models are suitable as individual or end devices in a series wired chain of standard CSS34 sensors to replace a safety control module. The CSS34F0/F1 system, comprising the sensor, monitored relay and the reset switch, meets the requirements of PLe per EN ISO 13849-1, or Control Category 4 per EN954-1, provided that positive guided contactors/relays are used.