1. Introduction
The KERUI P831 wireless indoor infrared detector utilizes digital dual-core fuzzy logic control processing technology and intelligent analysis algorithms. This allows it to effectively distinguish interfering signals from actual body movement signals, preventing false alarms. Key advantages include environmental protection, safety, reliability, and convenient installation. It is ideally suited for various environments such as residential areas, villas, factories, stores, warehouses, and office buildings.
2. Package Contents
Please check the package for the following items:
- 1 x KERUI P831 Motion Sensor
- 1 x Magnetic Swivel Base
- 1 x CR2450 Battery (may be pre-installed)
- 1 x User Manual (this document)
3. Product Overview
The KERUI P831 is a compact and versatile motion sensor designed for easy integration into your security system.
Figure 1: Sensor Components
The sensor features a detection window and an automatic magnetic suction bracket for flexible mounting.
Figure 2: Sensor Dimensions
The sensor measures approximately 45mm in height and 20mm in width.
Figure 3: Magnetic Swivel Base
The sensor easily attaches to its magnetic swivel base, allowing for adjustable positioning.
4. Setup and Installation
4.1. Battery Installation
The sensor requires one CR2450 battery. If not pre-installed, open the sensor casing (refer to the diagram in the full PDF manual if needed) and insert the battery, ensuring correct polarity.
4.2. Choosing an Installation Location
Selecting the correct location is crucial for optimal performance and to prevent false alarms:
- Avoid Heat Sources: Do not install near windows, air conditioners, fluorescent lights, heaters, refrigerators, stoves, direct sunlight, or any other areas where temperature changes rapidly.
- Avoid Air Currents: High airflow speeds can also cause interference.
- Multiple Detectors: If installing multiple detectors in the same area, adjust their positions to prevent mutual interference.
4.3. Mounting the Sensor
The sensor should be mounted using its magnetic swivel base:
- Secure the magnetic swivel base to a wall or ceiling using appropriate screws (not included).
- Attach the motion sensor to the magnetic base.
- Recommended Height: The ideal installation height is approximately 2 meters (6.5 feet) from the ground.
- Detection Angle: The infrared detector is more sensitive to vertical movement than horizontal movement. For best results, position the sensor to detect movement at a 90-degree angle to the direction people typically walk.
Figure 4: Detection Coverage
The sensor has a detection range of 4-8 meters and a 45-degree detection angle.
4.4. Pairing with Alarm Host (if applicable)
If you are integrating this sensor with a KERUI alarm host (e.g., W181, W184, W204), refer to your alarm host's manual for specific instructions on how to add or pair new wireless sensors. Typically, this involves putting the alarm host into a learning/pairing mode and then triggering the sensor.
Figure 5: Wireless Connection to Alarm Host
The sensor communicates wirelessly with a compatible alarm panel.
5. Operating Instructions
5.1. Initial Test
After installing the battery and mounting the detector:
- Walk within the detecting range (moving from left to right or right to left).
- Observe the LED indicator on the sensor to confirm it flashes once when motion is detected. This indicates normal operation.
- Adjust the detector's angle as needed to achieve the best detection coverage for your area.
5.2. LED Indicator Status
- LED flashes once: Indicates that the detector has sensed motion and triggered an alarm signal.
- LED flashes once (intermittently): Indicates a low-voltage condition. Please replace the battery as soon as possible.
Note: The sensor has a 5-second re-detection interval. After the first detection of human movement, it will wait 5 seconds before it can detect movement again.
6. Maintenance
6.1. Battery Replacement (Low-Voltage Reminder)
When the battery voltage drops below 2.4V, the sensor's LED indicator will flash once, and it will send a low-voltage signal to your alarm host. The alarm host will typically announce