Basic Function: Its core function is to detect whether there is paper inside the ECG machine and promptly alert the main unit when paper is out.

Working Principle: It typically consists of one or a group of photoelectric sensors (photocouplers). Its principle is as follows:

1. One end of the sensor emits infrared light.

2. When paper is present, the paper reflects the infrared light, which is detected by a receiver at the other end. The main unit then determines that "paper is present."

3. When paper is absent, the infrared light is not effectively reflected (or is absorbed), and the receiver signal weakens or disappears. The main unit then determines that "paper is out" and triggers a buzzer alarm or displays a message such as "PAPER OUT" on the screen.

Importance: If this function malfunctions, the machine may fail to sound an alarm when paper is out, potentially missing important patient ECG records. Alternatively, it may issue a false alarm, indicating that paper is out even though paper is present, preventing normal operation.

Warranty period: 90 days. We provide warranty for both new and used equipment. Different equipment has different warranty periods. Please contact us for specific warranty details.

Express delivery methods include DHL, FedEx, UPS, etc. Delivery typically takes 3-5 working days after payment completion. Shipping costs vary by destination country/region. Contact us for specific shipping details or tracking information.

All equipment, whether new or used, undergoes comprehensive inspection by our engineers before shipment. Our 90-day warranty ensures you can purchase with confidence.

• Use only the correct electrical outlet to avoid damage or malfunction
• Avoid long-term storage in high temperature and high humidity environments
• Do not use high-temperature, high-pressure vapour or ionizing radiation for disinfection
• Do not use chloric disinfectants such as chloride or sodium hypochlorite
• Keep away from water and fire sources