URDK 20N6903/S35A, BAUMER, ultrasonic retro-reflective sensor, 0–1000mm, NPN, normally open (NO), connector M8, IP67

URDK 20N6903/S35A, BAUMER, ultrasonic retro-reflective sensor, 0–1000mm, NPN, normally open (NO), connector M8, IP67

URDK 20N6903/S35A is a Baumer retro-reflective ultrasonic sensor. Detection is set relative to a fixed reference surface, so a change in the monitored space can be detected. Position of the reference surface: 200–1000mm. Declared detection range: 0–1000mm. Connection: connector M8.

Technical parameters – overview

Function and suitable use

The retro-reflective version is chosen when a stable reference surface can be defined in the machine and its covering or a change in distance can be detected. The position and stability of the reflecting surface are essential for correct setting.

How to choose the right variant

• Range: 0–1000mm; design the target position within the declared interval, not on the basis of the series designation.
• Output: NPN, normally open (NO); check compatibility with the control unit input.
• Mounting: rectangular version; observe the dimensions and recommended fixing.
• Wiring: The M8 connector makes sensor replacement easier; when ordering the mating part, check the number of pins and the wiring of the individual wires.
• Environment: protection IP67; verify suitability for specific contamination, temperatures or chemical influences according to the operating conditions.

Most frequent selection questions

Does a retro-reflective sensor need a reference surface?

Yes. The principle of this version is based on a set reference surface; the declared range of its position must be respected.

What connection is needed?

For this model, the stated connection is connector M8. The mating part and pinout must be verified according to the manufacturer's version.

What output does this variant have?

The output circuit is NPN, normally open (NO). Before connecting, compare it with the input type of the PLC or other control unit.