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The CSS 180 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 180 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). Furthermore, the requirements of Control Category 4 to EN 954-1 are also satisfied.

The standard IEC EN 61508, the latest specification for ensuring universal compliance to international safety standards, was used as a guideline for the development of the safety sensor. Consequently, the CSS 180 safety sensor can be used in SIL 3 applications to IEC 61508.

Operation

The CSS 180 Safety Sensor and CST 180 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 500 mA. Due to continuous internal function tests and the monitoring of the safety outputs, a number of CSS 180 Safety Sensors can be wired in series without detriment to the control category. Series wired safety sensors continue to fulfill the requirements of Control Category 4 according to EN 954-1.

Features & Benefits

• Non-contact sensing … for long term reliability.
• Sealed for moisture protection … ideal for most hostile environments.
• Tamper-resistant … matched sensor and actuator required for operation.
• Integral LED diagnostic indicators … facilitate easy installation and troubleshooting.
• Integral self-monitoring … satisfy requirements of Safety Control Category 4.
• Designed for "daisy chaining" … up to 200m.
• Dual PNP 500mA safety outputs … for application versatility.

Typical Applications

The sealed, compact units are ideal for use on movable machine guards where multiple guard monitoring on a machine and for where hostile environments exist. Typical applications include printing machinery, textile machinery, paper converting equipment, material handling systems, packaging machinery, chemical processing equipment, and woodworking machinery.