Automatic Door Sensor 24.125GHz | Compact Design | net weight 0.215kg Sensitivity
This 24.125GHz Automatic Door Sensor is a streamlined motion detection solution crafted for all automatic door systems, featuring a space-saving compact design, an ultra-light net weight of just 0.215kg, and fully adjustable sensitivity—three key advantages that redefine practicality and adaptability for commercial, office and retail entryways. Tuned to the reliable 24.125GHz microwave Doppler frequency band, it delivers accurate motion sensing for automatic door trigger needs, with a precision sensitivity potentiometer that allows gentle, stepless adjustment to tailor the detection range to your specific space: narrow it for small entryways to avoid false triggers, or widen it for high-traffic areas to ensure full coverage of human movement. The sensor’s compact ABS housing (120mm×80mm×50mm) boasts a sleek, minimal profile that mounts discreetly on door frames, ceilings or adjacent walls, blending seamlessly with any automatic door setup without occupying excess space, while its 0.215kg lightweight build eliminates the need for heavy mounting hardware, supporting quick, stable installation on various surfaces.
Optimized for real-world automatic door use, this sensor detects targets moving at ≥5cm/s with consistent accuracy, avoiding mis-triggers from door vibrations or ambient interference, and pairs its space-saving design with robust performance: it supports 12-24V AC/DC wide voltage supply, features low power consumption of ≤2W for energy-efficient long-term operation, and meets IP54 dustproof and waterproof standards for reliable use in indoor and covered outdoor environments. A clear LED status indicator simplifies quick setup and troubleshooting—flashing on power-on and solid when motion is detected—while the 2.2m pre-wired cable ensures easy wiring with standard automatic door control systems. Compliant with R&TTE and EMC international standards, this 24.125GHz Automatic Door Sensor merges compact, lightweight design with customizable sensitivity, making it a versatile, easy-to-integrate motion detection choice for all automatic door access control needs.

Product Highlights
- 24.125GHz mainstream microwave frequency for stable motion detection (≥5cm/s)
- Wide detection field: 4m(W)*2m(D) at 2.2m mounting height
- Flexible angle adjustment: 0°~90° vertical / -30°~+30° lateral tilt
- Wide voltage supply: 12-24V AC/DC with low power consumption (≤2W)
- IP54 protection & -20℃~+55℃ working temperature for indoor/outdoor semi-enclosed use
- Easy installation & adjustment with compact size, sensitivity potentiometer, and clear LED status prompt
- Reliable output: 1.5s signal hold, 42V AC/DC max contact voltage, 1A resistive current
Technical Specifications
| Parameter |
Specification |
| Technology |
Microwave Doppler Radar |
| Transmitter Frequency |
24.125GHz |
| Transmitter Radiated Power |
<20 dBm EIRP |
| Transmitter Power Density |
≤5mW/cm |
| Maximum Mounting Height |
3m |
| Tilt Angles |
0°~90° vertical; -30°~+30° lateral |
| Detection Field (2.2m mounting) |
4m(W)*2m(D) |
| Detection Mode |
Motion detection |
| Minimum Detectable Speed |
5cm/s (sensor axis) |
| Supply Voltage |
12-24V AC ±10%; 12-24V DC +30% / -10% |
| Mains Frequency |
50-60Hz |
| Power Consumption |
≤2W(VA) |
| Output Mode |
Switch tube output |
| Signal Output Time |
1.5s hold |
| Max Contact Voltage |
42V AC/DC |
| Max Contact Current |
1A (resistive) |
| Max Switching Power |
30W(DC) / 60VA(AC) |
| Working Temperature Range |
-20℃ ~ +55℃ |
| Degree of Protection |
IP54 |
| Norm Conformity |
R&TTE 1999/5/EC; EMC 89/336/EEC |
| Material |
ABS |
| Housing Color |
Black/Silver |
| Dimensions (W*H*D) |
120mm*80mm*50mm |
| Net Weight |
0.215kg |
| Cable Length |
2.2m |
Installation & Adjustment Guide
The sensor's performance is closely related to correct installation and adjustment. Simple operation with no professional tools required:
Mounting Requirements
Avoid vibration positions, neon lamp proximity and sensor occlusion; do not touch internal electronic parts during installation.
Sensitivity Adjustment
Rotate the sensitivity potentiometer gently and slowly; the sensitivity value determines the size of the detection field (adjust to 1/2 or higher for short detection distance).
Angle Adjustment
Planar antenna lateral angle = detection field position; vertical angle = detection field depth; set microwave module angle to ≥45° for optimal detection.
Status Check
LED flashes after power-on (normal standby); LED lights up continuously when a moving target is detected (detection trigger).
Troubleshooting Guide
| Fault Phenomenon |
Probable Causes |
Corrective Action |
| Door does not open & LED no light |
Sensor power off |
Check wiring connection and power supply validity |
| Door opens/closes constantly |
Sensor detects door vibration/movement; interference source in detection range |
Fix the sensor firmly; increase tilt angle/reduce sensitivity; remove interference sources in the detection field |
| Detection distance is too close |
Low sensitivity; microwave module angle <45°; sensor blocked |
Adjust sensitivity potentiometer to 1/2 or higher; set module angle to ≥45°; remove occluding objects |
Application Scenarios
The RD24-4S is a multi-scenario motion detection sensor with high adaptability, primarily applicable to:
- Automatic Door Systems: Sliding doors, swing doors, glass induction doors (commercial buildings, shopping malls, office buildings)
- Security & Monitoring: Perimeter security detection, indoor human motion induction (residential, factory, warehouse)
- Industrial Automation: Conveyor belt motion detection, equipment start/stop induction (light industry production lines)
- Intelligent Building: Smart lighting induction, air conditioning induction (public areas such as corridors and elevators)
Core Technologies
Microwave Doppler Radar Sensor 24.125GHz Radar Sensor Automatic Door Motion Detector Wide Field Detection Sensor IP54 Motion Sensor