HG G-19321

Multiple Frequency Sensor | Inductive | Indoor | Analog Output | insensitive to crossing wires with the same frequency

Main Features

• Inductive multiple frequency sensor for AGVs
• Indoor usage IP 40
• Detection of the electromagnetic field (flux) in horizontal direction (vertical)
• Multiple frequencies: 8 preset frequencies, selection of the desired frequency via 3 digital inputs (see table on the back)
• Analog output -10 VDC to +10 VDC
• Guide wire detect signal (Detect)
• Connection: Cable tail 1.3 m or M12 connector with or without cable

The sensor is used for track guidance of automated guided vehicles (AGVs). Due to the arrangement of the coils, the sensor HG G-19321 is insensitive to crossing wires with the same frequency. With its coils, it detects the horizontal components of an alternating magnetic field around a current-carrying guide wire laid in the ground.

Sketch: Functionality of guide wire track guidance with inductive multiple frequency sensor HG G-19321-A

When moving the sensor across the guide wire two characteristic voltages are induced. The Uref (sum voltage) shows a bell shaped curve with a maximum directly above the wire. The Upos (difference voltage) shows maxima at both sides of the wire and falls to zero directly above the wire.

The two output voltages can be used to determine the lateral deviation of the antenna from the wire. For a simple steering function connect Upos to the steering drive using a P-controller.

The digital Wire-Detect output switches to +24 VDC if the induced Uref voltage exceeds an adjustable threshold. The wire detect signal is often used to stop the AGV in case it drives off the track.

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