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Adjustment
Alignment
Ambient light limit
Ambient temperature
Autocollimation

ADJUSTMENT (POTENTIOMETER)

The sensitivity is adjusted (if provided) by means of the built-in single or multi-turn potentiometer. Turning it clockwise increases the sensitivity. Multi-turn potentio-meters cannot be turned over their end position (no stops).

Through-beam Sensors / Reflex Sensors
The potentiometer is normally set to the maximum sensitivity (turned clockwise). This provides the maximum excess signal. A reduction in sensitivity may only be necessary to sense transparent objects.

Diffuse Sensors, Energetic
Set the sensitivity so that the object involved is reliably detected; for reliable operation, the green LED should light up and the yellow LED should not flash (series 1040/50). Remove the object now. If the output remains ON (sensing the background) the sensitivity must be reduced slightly.

Diffuse Sensors with Background Suppression
The set-up must ensure that the target is clearly identified, and any background excluded. The target should first be position-ed at the maximum foreseeable distance from the beam, and the potentiometer adjusted so that the output just switches on. Next, the target is taken away and the potentiometer adjusted so that the background causes the output to just switch on. Finally, the potentiometer is set to half way between the two previous readings. Where there is no background, the potentiometer should be set to the maximum distance.

ALIGNMENT

Through-beam Sensors
Place first the receiver and fasten it in its final position. Then align the transmitter accurately onto the receiver.

Reflex Sensors
Place first the reflector as required and fasten it firmly. Cover the reflector all around with adhesive tape so that only the center (approx. 25% of the surface area) remains free. Fit the reflex sensor with the optical axis aligned to the reflector so that it switches reliably. Then remove the adhesive tape from the reflector.

Diffuse Sensors, Energetic
Align the unit with its optical axis to the object to sense so that switching is reliable. Check that enough excess light is available, i.e. the green LED must light up (series 1120, 1180, 3030, 3031, 4040, 6080), and with the series 1040/50, the yellow LED should not flash. Then fasten the device tightly.

Diffuse Sensors with Background Suppression
Line the beam up on the center of the target, before fixing firmly.

The proximity switches must not be mutually influenced. For this reason, a minimum distance between them must be provided.

Size
D Embeddable
A(mm) Non-embeddable
A(mm)

C8, M8 8 16

M12 12 27

M18 21 28

M30 37 80

C40 75 180

C60 - 180

C80 - 500

AMBIENT LIGHT LIMIT

Ambient light is the light produced by external light sources. The intensity of illumination is measured on the light incidence surface. The sensors are basically insensitive to ambient light due to the use of modulated light. There is nevertheless an upper limit for the intensity of any external light and this is referred to as the ambient light limit. It is given for sunlight (unmodulated light) and halogen lamps (light modulated at twice the mains frequency). Reliable operation of the units is no longer possible at light intensities above the re-levant ambient light limit.

AMBIENT TEMPERATURE

The specified temperature range should not be exceeded. The switch may be dam-aged and its function is no longer defined. For some models, extended temperature ranges are available on request.

AUTOCOLLIMATION

Photoelectric proximity switches using the autocollimation principle are characterized by the fact that the optical axes of the emitting and receiving channels are identical. This is possible with light from one of the channels being deflected by means of a semi-transparent mirror. This principle completely eliminates the interfering dead area often found in the proximity of the sensor, which is of special advantage when using reflex sensors. Reflex sensors with autocollimation are especially suitable for reflecting foil type reflectors.

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