Firstly, we need to understand the definition of transmission error. Transmission error refers to errors caused by factors such as interference, attenuation, and noise during transmission. For oil-water interface instruments, the transmission error is mainly related to the following factors.

　　1. The accuracy of the sensor: The sensor is a key component for measuring the position of the oil-water interface. The higher the accuracy of the sensor, the greater its measurement results and the smaller the transmission error.

　　2. Transmission distance: The signal of the oil-water interface instrument needs to be transmitted to the display screen or computer for processing through cables. If the transmission distance is too far, the signal will attenuate, affecting measurement accuracy and causing transmission errors.

　　3. Environmental interference: When using an oil-water interface instrument, environmental interference can also have an impact on it. For example, when the instrument is disturbed by electromagnetic radiation or mechanical vibration, it can lead to inaccurate measurement data, resulting in transmission errors.

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