Overview

The SLM Series Slot Sensor (sometimes called a “fork sensor”) comprises an opposed-mode emitter and its receiver inside a single

convenient housing.

Opposed-mode sensing is very reliable, and the single, self-contained housing provides easy installation, with no sensor alignment

required. In addition, molded-in arrows on the housing show at a glance the position of the beam, simplifying installation placement.

Applications include counting, gear tooth detection, edge detection, part sensing on conveyor rails and belts, position and orientation

verification, dimension verification, tool break monitoring, and level monitoring.

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1

3 4

5

6

8

9

1. Output LED (amber)

2. Power on LED (green)

3. Dark/Light Operate select switch

4. Sensitivity potentiometer

5. Receiver aperture

6. Emitter aperture

7. Beam position arrows

8. Mounting hole (all models except SLM10 and SLM20)

9. Mounting holes (all models)

Wiring Diagrams

NPN

10–30 V dc

–

+

3

1

4

Load

PNP

10–30 V dc

–

+

3

1

4

Load

Bipolar

10–30 V dc

–

+

1

3

2

4

Load

Load

Key

1. Brown

2. White

3. Blue

4. Black

Configuring the Sensor

For the best results, place the objects to be detected midway between the emitter and receiver.

Adjusting the Sensitivity

Adjust the sensor’s sensitivity by turning the 270-degree-turn Sensitivity potentiometer with a small flat-blade screwdriver.

Apply power to the sensor and turn the potentiometer all the way clockwise (maximum gain). If the object to be sensed does not block

the beam at the maximum gain, turn the gain down a little at a time, testing with the object, until the object can be sensed reliably.

If adjusting the sensitivity with the potentiometer does not provide reliable object detection, investigate alternative sensing methods.

Selecting Light or Dark Operate

Select dark operate (D.O.) or light operate (L.O.) by turning the DO/LO selector switch to the desired setting using a small flat-blade

screwdriver.

If dark operate is selected, the output conducts when the receiver element does not see the emitted light (object is present). If light

operate is selected, the output conducts when the receiver element sees the emitted light (object is absent).

SLM Series Slot Sensors

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