3. Check the device alignment.

4. Tighten the mounting screws to secure the device (or the device and the bracket) in the aligned position.

Wiring Diagrams

4

10-30V dc

Beam

Attenuator

–

+

1

3

Key

1 = Brown

2 = White

3 = Blue

4 = Black

Note: Quick disconnect wiring diagrams are functionally identical.

Alignment

The beam size listed in

Figure 1 on page 2 is also the effective beam size at the receiver. The effective beam is equal to the minimum opaque

object profile required to block the light beam. The beam size at the emitter is 2.5 mm (0.1 in) diameter.

Sensing Distance = X

Approx.

0.5mrad = 0.029°

Approx. 2.5 mm

W = 2.5 mm + 2X(tan.0029º) = 2.5 mm + X(0.001)

W

Laser Emitter

Opposed Distance (X)

Beam Width (W)

1.5 m (5 ft)

4 mm (0.2 in)

3.0 m (10 ft)

5.5 mm (0.2 in)

6.1 m (20 ft)

8.5 mm (0.3 in)

15 m (50 ft)

18 mm (0.7 in)

30 m (100 ft)

32 mm (1.3 in)

Figure 1. Laser emitter beam divergence at 25 °C (beam size vs. distance)

The effect of angular misalignment is dramatic (see

Figure 2 on page 2). Laser emitters require the beam center to directly strike the receiver lens.

Figure 2 on page 2 shows how far the laser beam will miss the center of the receiver lens for each degree of angular misalignment. Note that even

at only a 1.5 m (5 ft) range, one degree of misalignment causes the laser beam to miss the lens of most receivers.

Tip: The visible red beam of the laser emitter is easily seen in subdued lighting. At opposed distances of up to 3 m (10 ft),

attach a sheet of white paper directly in front of the receiver lens. Mark the location of the lens center on the paper; use the

mark as an aiming target. Sight along the beam from directly behind the laser emitter. Adjust the emitter mounting until the red

image (the dot of red light) is centered exactly on the mark. Remove the paper and check the response of the receiver.

Sensing Distance = X

Ø = Misalignment Angle

Y = X(tan Ø)

Laser Emitter

Y

Opposed Distance (X)

Beam Displacement (Y) of 1° of

Misalignment

1.5 m (5 ft)

4 mm (0.2 in)

3.0 m (10 ft)

50 mm (2 in)

6.1 m (20 ft)

100 mm (4 in)

15 m (50 ft)

250 mm (10 in)

30 m (100 ft)

500 mm (20 in)

Figure 2. Beam Displacement per degree of misalignment

For longer distances (up to 7.6 m [25 ft]), replace the white paper with a 100 mm (4 in) × 100 mm (4 in) square of high-grade retroreflective tape

(Banner model BRT-THG-4X4-5 or equivalent; see

Figure 3 on page 3). For greater distances, use a larger sheet of retroreflective material.

Note: Never use a mirror as an alignment target.

S186ELD(Q) Laser Diode Emitter

2

www.bannerengineering.com - Tel: + 1 888 373 6767

P/N 35749 Rev. E