Things used to be better...
...you could also say this about the PT170420 with background suppression, since the optical sensor has been part of the product range from ipf electronic since 1997 and was already considered a high-end device back then.
Adjustment of the background suppression which works in accordance with the triangulation principle is simple: The convex lens is tilted continuously in front of the receiver unit using an adjustment screw, whereby the light reflecting from an object meets one of two receivers (diodes) integrated in the device. Depending on which receiver is generating an output signal (determined by the incident reflection light beam), it is possible to say precisely whether or not the object is located within the predefined detection range. The focused lights is evaluated nearly independently of color with a precision of 1/10m.
The operating principle has remained essentially unchanged with the new PT190420 diffuse reflection laser sensor with background suppression in plastic housing (protection class IP67). The tried-and-tested technology has been maintained, but with one important difference: The power of the laser diode is reduced to less than 1mW, which corresponds to laser class 1.
The laser beam is therefore not harmful to the human eye, as long as its cross-section is not narrowed using optical aids. And still, the PT190420 achieves a switching distance of up to 300mm.
Up to 5m operating range
Other "new additions" to the family of laser class 1 devices from ipf electronic also include the PT230020, which delivers a distance-proportional output signal of 4 … 20 mA and features an additional switching output.
The innovation (degrees of protection IP67/IP69k) works in line with the so-called time of flight principle, meaning the time of flight measurement of a pulsed light pulse from the sensor transmitter to the receiver over a certain distance. A big advantage of this process is that the range or the switching distance of the laser sensor is largely independent of the reflection properties of an object surface. In particular, very high ranges of up to 5m can be realized for distance measurements with this laser sensor.
The new laser sensor is set either via teach-in or the integrated IO-Link interface.
The device achieves a repeat accuracy of 1.2mm over the total distance. Both new solutions from ipf electronic can be exchanged with one another thanks to the identical hole pattern. The M12-connector has also been maintained, but can now be rotated by 270°, which further increases flexibility during mounting.