Introduction

Why choose our ultrasonic sensors?
Our ultrasonic sensors have many advantages over optical, inductive, capacitive and magnetic switches.

1. . They can sense any material. With a few exceptions, all objects can be detected equally well so long as a certain minimum size and a certain maximum angle of incidence are maintained.
2. No correction factors have to be applied (as with inductive sensors, for example). Color does not matter. The surface of the scanned objects has no influence on the measuring accuracy. Only the maximum permitted angle of incidence is affected by the surface roughness.
3. They function in fog, dust, dirt, or extreme lighting. These create problems for many optical sensors.
4. Ultrasonic sensors are very good at detecting transparent objects (foil, panes of glass, bottles, etc).
5. They are able to disregard disturbing backgrounds (provided the right model is chosen).
6. Us distance sensors can still detect small objects at considerable distances with high linearity output. (Here inductive and capacitive sensors fail completely).

Where are the limits to using ultrasonic sensors?

1. The system itself and the laws of physics (the speed of sound is 341m/s in air at 20℃) mean that SNT sensors are relatively slow. The maximum switching rate with series UPR 702 is 25HZ.
2. For the same reasons, resolution is about ±1.5mm (assuming constant ambient conditions, carrier frequency 185KHZ).
3. They do not work under water, in a vacuum or at elevated pressures (their transmission medium is air at barometric pressure).
4. Ultrasonic distance sensors cannot be used where there is an explosion hazard.
5. They cannot detect very hot or very cold objects (turbulence in the transmission medium refracts and scatters the sound).