Ultrasonic Proximity Sensors

Proximity sensor with digital output

A special sonic transducer is used for the ultrasonic proximity sensors, which allows for alternate transmission and reception of sound waves. The ultrasonic transducer emits a number of sonic waves which are reflected by an object, back to the ultrasonic transducer. After emission of the sound waves, the ultrasonic sensor will switch over to receive mode. The time elapsed between emitting and receiving is proportional to the distance of the object from the sensor.
Ultrasonic proximity sensors enable the detection of different objects - irrespective of color and transparency.

Digital output:

Sensing is only possible within the detection area. The required sensing range can be adjusted with the sensor's potentiometer. If an object is detected within the set area, the output changes its state. The built-in LED indicates this change.

2 point proximity switch with Teach-in (Digital output)

 

The button that thinks - "Teach-in"

The operating ranges, Sde and Sde can be adjusted and the output function is selectable.
Ultrasonic sensors with the "Teach-in" function are similar to the standard range of products but have the added versatility of a simple touch key set up.

Digital output:

Advantages

	Set up configuration is saved on an internal EEPROM ensuring long term stability.
	Simple one button set up, no tools required.

Proximity sensor with analogue output

Analogue output:

Both current and voltage outputs of the ultrasonic proximity sensors, are proportional to the distance to the target. The user can change the slope of the output curve using the built-in potentiometer or teach mode button. By doing so they are able to define the required resolution.
Sensor versions, which have a built-in A/D-Converter, generate output signals divided into discrete steps. Applications having long cable runs where there might be EMI or RFI interferences, should use ultrasonic sensors with an analog current output.

The analog output can be set to either rise or fall proportional to the target distance.

Advantages

	The optimum resolution for a particular installation is automatically set up.
	Set up configuration is saved on an internal EEPROM ensuring long term stability.
	Simple one button set up, no tools required.
	Multi functionality from one sensor means lower inventory costs.