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Optical Sensors - Photointerrupters - Slot Type - Transistor Output - HOA0870-T55 application field and working principle

The HOA0870-T55 photoreflector industrial switch module consists of an infrared LED and a phototransistor. It is a type of optical sensor, specifically a photointerrupter with a slot type and transistor output.

Application Fields

The HOA0870-T55 switch module is widely used for non-contact switching applications in the fields of office automation, peripheral device control, toys, domestic appliances, industrial, electrical and electronic product automation, traffic signal equipment, building intercom systems, and green lighting. It is resistant to external RF noise, electrostatic discharge (ESD), vibration, temperature change, and has long sensing distance.

Working Principle

The HOA0870-T55 switch module works on the principle of photoelectricity. When an object passes between the infrared LED and the phototransistor, the phototransistor does not receive light rays from the LED and the collector-emitter voltage decreases. This decrease of voltage in the collector-emitter switching circuit causes the output to change from low to high and hence a switching action is achieved. At the same time, when an object moves away and the infrared LED is able to irradiate the phototransistor, the collector-emitter voltage increases and the output changes from high to low. Thus, the HOA0870-T55 provides a non-contact on-off switching output, which can applied in the detection of the objects in automation control.

Advantages

The main advantages of the HOA0870-T55 switch module include its long sensing distance of up to 8mm, a wide operating temperature range of -40 to +85C, a high response speed of 5msec, and excellent insulation characteristics between primary and secondary circuits. The LED emits a constant beam of light and the background light has no effect on it. This enables precise triggering of the output. Furthermore, the HOA0870-T55 switch module is resistant to external RF noise and electrostatic discharge.

Conclusion

The HOA0870-T55 switch module is an optical sensor, specifically a Photointerrupter with a slot type and transistor output, which is used for non-contact control switching and detects objects with high precision and accuracy. It is resistant to external RF noise, ESD, vibration, temperature change, and has long sensing distance. It offers many advantages including long sensing distance, a wide operating temperature range, a high response speed, and excellent insulation characteristics between primary and secondary circuits. Therefore, the HOA0870-T55 switch module is essential for many automation control applications.

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