Compact safety switch offers extended range

However, Steute says the key innovation is to offer the crucial characteristic of a large switching distance - 6mm switching on, 15mm switching off - which was previously not possible with magnetic sensors. This advance is based on equipping the HS Si 4 with a Hall sensor.

The HS Si 4 complements its small size and its large switching distance by the property of being resistant to vibrations, making it extremely well suited to applications on machine guards. A further characteristic is the wide operating temperature range: the HS Si 4 can be used in temperatures of -20 up to +70degC without problems.

This new safety sensor is available with two contact configurations (1 NC and 1 NO contact). It comes equipped with a pre-wired cable for semiconductor outputs - a vital precondition for this unit's high protection class (IP 67). The steute SRM 21 RT2 safety module provides signal evaluation: this module is suitable for applications up to control category 4 (EN 954-1). The module has two enabling paths, a feedback control circuit and a semiconductor output as signalling contact.