The "size" of sensors L and D usually refers to their sensing range or sensitivity, rather than their physical dimensions. In most cases, the physical dimensions of these two types of sensors are fixed, but the sensing range and sensitivity can be adjusted according to actual needs.

The induction range of inductive sensor L is affected by factors such as coil size, shape, and relative position with the measured object. By adjusting these parameters, the sensing range can be changed to some extent. Sensitivity is usually achieved by adjusting components such as resistors and capacitors in the circuit.

The sensing range and sensitivity of distance sensor D or photoelectric sensor D depend more on the intensity of emitted light and the performance of the receiver. Adjusting the intensity of the emitted light or changing the gain of the receiver can affect the sensing distance and sensitivity of the sensor.