Frequently Asked Questions

Q: Can the outputs of photoelectric sensors be connected in parallel?

A: Yes, the NPN or PNP outputs can be connected in parallel.

Q: Can the photoelectric sensors be damaged in presence of a short-circuit of the NPN or PNP output?

A: No, thanks to the internal circuit that protects the output against overload.

Q: Can the keyboard of the TLµ series contrast sensors or LDµ luminescence sensors be blocked?

A: Yes, using the specific internal dip-switch as described in the operator manual.

Q: Can the amplifiers of the TEN fibre optic series be used as contrast sensors?

A: Yes, using the TEN-2-x or TEN-5-x models, with double red or green emission and 5kHz switching frequency, preferably together with the OF-44 coaxial optic fibre and the AF3 or AF4 focussing lenses.

Q: Is the LASER emission of the SL5 photoelectric series dangerous?

A: No, any eye or body exposure to the LASER emission of the SL5 photoelectric sensors is not dangerous, as the emission type is inside the limits foreseen for the class 1 complying with the EN60825-1 standard.

Q: Does a photoelectric sensors with a lens defogging system exist?

A: Yes, the S30 series presents versions with electrically heated protection glass and thus avoid fogging. These models are identified by the M letter at the end of their description, e.g.: S30-5-B8-2P-M.

Q Does a glass protection for the lenses of the M18 photoelectric sensors exist?

A Yes, the MEK-proof accessory, composed of a metal o-ring and a circular glass lens which can be screwed on the optic side of the sensor housing.

Q What does the green LED in the universal sensors with basic optic functions indicate?

A: The green 'stability' LED indicates the received signal level and it facilitated sensor alignment; when alit it indicates that the signal is superior to 130% of the minimum value necessary for output switching.

Q Why is the TEST function in the through beam photoelectric sensors necessary and how is it activated?

A: The TEST function allow the user to effect a preventive and autodiagnostic control of the correct sensor functioning without placing the object to detect between the emitter and receiver. The emitter emission is deactivated each time the TEST+ input is connected to the positive power supply, or the TEST- input to the negative power supply, and thus the object's presence is simulated, provoked the receiver output switching.

Q: Which precautions have to be taken when installing photoelectric sensors with the background suppression proximity function?

A: The sensor has to be mounted ensuring that the object to detect intersects at the same moment the emitter and receiver lens axes, and thus the longer side of the sensor's optic results to be perpendicular to the flow line of the object to detect.