1. Introduction
This manual provides detailed instructions for the YMJOINMX Digital LED Counter, designed for accurate piece counting in various industrial applications such as factory production lines and conveyor systems. It features an infrared sensor for automatic counting, an alarm reminder function, and a clear LED display capable of counting up to 99999.
2. Safety Information
- Ensure the power supply matches the device's requirements (DC 12V-24V).
- Do not expose the device to excessive moisture or extreme temperatures.
- Avoid direct eye exposure to the infrared sensor's beam.
- Install the device securely to prevent accidental falls or damage.
- Disconnect power before cleaning or performing any maintenance.
3. Package Contents
Verify that all components are present in the package:
- Digital Counter Display Unit
- Infrared Sensor
- Sensor Holder/Bracket
- Power Adapter

Figure 3.1: Included components of the Digital LED Counter system.
4. Setup and Installation
4.1 Mounting the Counter
The digital counter display unit features screw holes on its white casing for secure mounting. Choose a stable surface near your counting area, such as a conveyor belt or production line, and fix the unit using appropriate screws.

Figure 4.1: Example of counter installation on a production line.
4.2 Installing the Infrared Sensor
Attach the infrared sensor to its holder/bracket. Position the sensor so that the invisible infrared beam is interrupted by the objects you wish to count. The sensing distance can be adjusted to optimize accuracy based on the size and speed of the objects.

Figure 4.2: Infrared sensor details. Sensing distance: 70cm (27.3in), Sensor cable length: 60cm (23.4in).
4.3 Adjusting Sensing Distance
The sensing distance of the infrared sensor can be adjusted. Use a small screwdriver to turn the adjustment screw on the sensor. Turning clockwise increases the sensing distance, and counter-clockwise decreases it. This allows for fine-tuning based on the size of the objects being counted and the desired detection range (11.7-27 inches).
Video 4.3: Demonstration of adjusting the infrared sensor's sensing distance.
4.4 Power Connection
Connect the provided power adapter to the digital counter unit and plug it into a suitable power outlet. The display will illuminate, indicating the device is ready for operation.
5. Operation
5.1 Basic Counting
Once powered on and the sensor is correctly positioned, the counter will automatically increment by one each time an object passes through and interrupts the infrared beam. The current count is displayed on the LED screen.

Figure 5.1: The Digital LED Counter in operation, showing an object being counted by the infrared sensor.
5.2 Resetting the Count
To reset the current count to zero, press the "^" (up arrow) key on the counter's front panel. This is a manual reset function.

Figure 5.2: Pressing the "^" key resets the count to 0.
5.3 Alarm Reminder Function
The counter can be set to trigger an alarm when a predefined count value is reached. This is useful for batch counting or production targets. When the count reaches the set alarm value, the alarm light will beep and flash continuously for 5 seconds.

Figure 5.3: Steps for setting the alarm value (H2 parameter) and alarm behavior.
5.4 Parameter Setting (Important Update)
IMPORTANT NOTE: The instructions included in the product packaging may not be fully updated. For the latest and most accurate parameter setting procedures, especially for alarm values and other advanced settings, please refer to the information below and the provided video. If you encounter any difficulties, please contact YMJOINMX customer support for the most current instructions.
To enter the programming page for parameter settings, press the "SET" key for 3 seconds. Use the "<" and "^" keys to navigate and adjust values.

Figure 5.4: Parameter table for advanced settings.
Video 5.5: Detailed guide on how to modify the counter's parameters.
6. Maintenance
- Keep the counter and sensor clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Ensure the infrared sensor's lens is clear for optimal performance.
- Regularly check all connections to ensure they are secure.
- Store the device in a dry environment when not in use.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Counter not incrementing | Sensor misaligned or obstructed; object not interrupting beam; sensor malfunction. | Adjust sensor alignment and sensing distance. Ensure objects pass directly through the beam. Clean sensor lens. |
| Inaccurate counting | Sensing distance incorrect for object size; black objects (infrared limitation); rapid counting. | Fine-tune sensing distance. Note that black objects may not be sensed. For metal objects, a metal sensor is required. For irregular objects, an irregular object sensor is required. Contact technical support for specific adjustments. |
| Alarm not sounding/incorrectly | Alarm value not set or set incorrectly; buzzer switch off. | Verify the H2 parameter (alarm value) is set correctly. Check the 'b' parameter (buzzer switch) in the settings. Refer to Section 5.4. |
| Display is blank or flickering | Power supply issue; loose connection. | Check power adapter connection and ensure it's plugged into a working outlet. Verify power supply voltage. |
| Unit in 'lock mode' or password required | Accidental activation of lock feature; unknown password. | There is no user-set password for this model. If the unit appears locked or unresponsive, please contact YMJOINMX technical support immediately for assistance. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | FBASeven047 |
| Counting Range | Up to 99999 |
| Sensing Method | Infrared Sensor |
| Sensing Distance | 11.7 - 27 inches (approx. 30 - 70 cm) |
| Power Input | DC 12V-24V |
| Alarm Function | Yes, with adjustable alarm value |
| Display Type | Digital LED |
| Package Dimensions | 6.85 x 4.49 x 3.78 inches |
| Item Weight | 2.2 Pounds |
| Manufacturer | YMJOINMX |
9. Warranty Information
YMJOINMX products are manufactured to high-quality standards. For specific warranty terms and conditions, please refer to the warranty card included with your product or contact YMJOINMX customer support.
10. Customer Support
If you have any questions, require technical assistance, or need further clarification on product settings, please do not hesitate to contact YMJOINMX customer support. We are committed to providing excellent quality and satisfactory service.
Contact Information: Please refer to the contact details provided on the product packaging or the official YMJOINMX website.