User Manual for BEA Magic Switch MS21H Activation Sensor

Quick Guide

The BEA Magic Switch MS21H is a touchless activation sensor designed for automatic doors. Key requirements for successful operation include the use of a BEA-provided isolation module for each sensor and proper grounding. Upon powering, the device requires approximately 10 seconds to complete its initialization sequence. Always test the sensor operation before leaving the installation site.

Product Description and Specifications

The MS21H uses capacitive sensing technology to detect proximity. It is housed in a NEMA 4 enclosure, making it suitable for various environments.

• Technology: Capacitive sensing
• Detection Mode: Proximity
• Supply Voltage: 12 – 24 VAC/VDC
• Sensing Zone: 0 – 4 inches (adjustable)
• Relay: 1-Form A Solid State Relay (0.4A 60 VAC/VDC max)
• Temperature Range: -20 to 120 degrees Fahrenheit

Installation

The sensor is compatible with single or double gang electrical boxes. Follow these steps for installation:

1. Install the electrical box.
2. Remove the two set screws and disassemble the faceplate assembly from the mounting ring.
3. Temporarily mount the mounting ring to the electrical box, ensuring the "THIS END UP" orientation is correct.
4. Mark the four hole locations, remove the ring, and install wall anchors.
5. Mount the ring to the electrical box and wall.
6. Remove the back of the NEMA 4 enclosure.
7. Complete wiring and settings before final assembly.
8. Reassemble the faceplate to the mounting ring and secure with the two set screws.

Wiring

Important: You must use a BEA-provided isolation module for each MS21H. The red wire must connect to power (+) and the black wire to power (-).

• Use 300 V, low-voltage shielded cabling.
• Maintain a distance of at least 6 inches from power lines of 120 VAC/VDC or higher.
• If using a wire harness with more than 5 conductors, wire all extra conductors to Earth Ground at both ends.
• Connect the isolation module to the door control using the provided wiring chart.

Settings and Adjustments

Adjustments are made on the sensor board:

• Sensing Zone (Potentiometer): Turn counterclockwise to decrease (0 inch minimum) or clockwise to increase (4 inch maximum).
• Audible Alert (DIP-switch 1): Set to ON for a 0.5-second pulse during detection; OFF to disable.
• LED (DIP-switch 2): Set to ON for LED on at rest (pulses off during detection); OFF for LED off at rest (pulses on during detection).

Functionality

• Activation: Signal is held until the sensing zone is cleared.
• Rejection: Objects must be in the zone for at least 130 milliseconds to trigger detection.
• Tracking: The sensor learns baseline capacitance to ignore stationary objects (e.g., chewing gum on the faceplate) after 5 seconds.

Troubleshooting

If the sensor is erratically detecting or falsely activating, ensure it is properly grounded and that the BEA isolation module is being used. If the sensor is not detecting, verify the power supply and increase the sensing zone via the potentiometer. For further assistance, contact BEA technical support at 1-800-523-2462 or visit www.beainc.com.