WTB27-3P3711

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Optical sensors detect light, illumination and, respectively, darkness. Being used for both industrial and commercial automation, they infer the end-of-travel switching applications and, hence, the presence or absence of objects. The WTB27-3P3711 photoelectric sensor, part of the WTB series presented by the ABB industrial automation supplier, is specifically designed and optimized for automated industrial control.

Features

The WTB27-3P3711, while equal in terms of company\'s design and form factor with the other three models, differs from them in the following features:

• It has an even greater sensing distance of 1250 mm with uniform response over the whole distance range.
• It comes with additional test and support functions such as external current test, Triac control test and full on/off control.
• It has a signal response time of 100 ms and a repeat accuracy of 0.1 mm.
• It features Teach-In technology, which allows the setting of the switching points during installation without the need of tools or knowledge of product parameters.
• Its expected operational life is around 5 million cycles.
• It is CE, UL, RoHS, KEMA and GOST certified.
• It is compliant with the safety standard EN61800-5-2 and noise emission standards EN55011 and EN61000-6-3.

Application Field and Working Principle

The WTB27-3P3711 is mainly used in applications where a precise timing is required in switching devices when an object is detected. Its main area of application is on automated, industrial machines, such as conveyors, hoists, sorters, picking systems, assembly lines, etc.

The WTB27-3P3711 is a simple photoelectric sensor based on retro-reflective technology. It is equipped with an emitter diode that sends a visible light in the red wavelength (with the help of a multi-chip LED) and a separate receiver diode that detects the reflected light. It can detect objects that have a minimum reflectivity of 5%, including glass, metal, plastic, etc.

The sensor can be set to function in four modes: NPN normally open, PNP normally open, NPN normally closed and PNP normally closed. The switching operation is controlled by the Teach-In function, which allows the user to set the desired switching point. Depending on the mode, when the object is detected the switching signal is either turned on or off.

Advantages

The WTB27-3P3711 is a reliable and efficient sensor with improved performance in terms of accuracy, operation speed, response time and operational life. Moreover, its Teach-In feature considerably decreases the installation time and eliminates the need of detailed product specifications.

In addition, the sensor is low maintenance and relatively easy to install, thanks to its form factor and protected design. Its IP rating (IP67) ensures a high level of protection from dust and water, therefore reducing the chances of malfunctioning.

The device also features a through-beam mode with suitable amplifiers, which can increase the sensing range up to 5 meters for more complicated applications.

Limitations

The main limitation of the WTB27-3P3711 is a relatively low accuracy of 0.1mm. That is why it is not suitable for precision measurements, requiring higher accuracy levels.

The device is also limited to detecting objects with a minimum reflectivity of 5%, so it cannot detect objects with a lower reflectivity, such as textiles or non-metallic elements. Moreover, it is not suitable for applications in harsh environments, such as those with extreme temperature or vibration.

Conclusion

The WTB27-3P3711 is a reliable and robust photoelectric sensor, designed and optimized for industrial control applications and, hence, suitable for automated processes where a precise timing is required in switching devices. It has a wide range of features and advantages, however with certain limitations and not recommended for more severe and demanding settings.

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