BNS-B20 Coded-Magnet Sensor Safety Door Handle

The Series BNS-B20 is designed for use as a combination door handle and safety interlock switch for use on light to medium weight hinged and sliding machine guards. Each unit consists of a door handle assembly equipped with two multiple reed switch arrays and coded magnet actuators. In addition, the unit features two latching magnets that attract pole pieces in the sensor unit—providing a holding force of approximately 100 Newtons.

The reed switches will only close in the presence of their matched magnetic field array … thus enabling machine operation. Both switch and magnet assemblies are sealed to IP67 (submersible) standards. Their tamper-resistant design prevents bypassing with simple magnets. The unit also features an LED display of switch status and an M12x1 quick-connect for ease of wiring and installation.

Operation

The unit consists of two components … the door handle unit and the sensor unit. The sensor unit is typically mounted to the stationary portion of the guard structure, with the codedmagnet/ handle assembly mounted to the movable element of the machine guard.

When the guard is closed, the matched magnetic fields align with the reed switch arrays, closing the switches and enabling machine operation. When the guard is open, or the magnetic fields are not properly aligned with their reed switch arrays, the sensor output will remain "off."

Typical Applications

The sealed low-profile, ergonomic door handle system is ideal for use on movable machine guards in hostile environments. The absence of protruding elements eliminate/reduce risk of injury and unintentional opening of the guard. Typical applications include food processing equipment, chemical processing equipment, woodworking machinery, packaging machinery, and printing equipment.

Features Benefits

• Tamper-resistant … cannot be bypassed with simple magnets
• Sealed for submersibility … assures long-term reliability in the most hostile environments.
• Dual-function latch & sensor … integral magnetic holding latch (with force of 100N).
• Application flexibility … 3-contact design compatible with 35mm, 40mm, and 45mm aluminum profiles
• Long-life … no mechanical wear due to non-contact design.
• Satisfies EN 954 Safety Control Category 4 … when used with compatible SCHMERSAL Series AES safety controller.
• Easy-to-install … M12 x 1 quick disconnect & LED status indicator in NC circuit
• Application diversity … suitable for hinged & sliding guards, available for left- or right-hand doors/guards.