OMRON Electronics has introduced the D40B, a new range of compact, non-contact door switches.
Because there is no contact between moving parts, mechanical wear and tear is significantly reduced, as are the adverse effects of particles resulting from mechanical abrasion.
The D40B series is used in safety door applications that require category 3 protection. This requires that a single fault in any component will not led to a loss of overall safety function. The non-contact feature means there is no keying mechanism, virtually eliminating maintenance due to door alignment problems.
The D40B switches are sold as a matching pair of sensor and activator and have a sensing distance of between 5mm and 20mm. For added versatility, three sizes are available: standard, elongated and high-temperature (up to 125°C).
All switching units have one or two pole outputs and came with either connectors or prewired with 3m, 5m or 10M cables. Separate safety controllers are available (D40B-J series) to maintain the safety rating.
The switches have a minimum electrical durability of 100,000 operations. They comply with several EN/IEC safety standards and have obtained both UL and TUV approvals. They have an IP67 rating, allowing them to be hosed down.