AS1716-ASOT

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Aseptically Switched Opto-Coupler (AS1716-ASOT) is a unique type of opto-coupler, used for sensor and detector interface applications. With an inherent ability to switch off automatically when the potential difference between two adjacent detector and/or power source lines changes, this opto-coupler is suitable for reliable operation in harsh industrial environments. This article sheds light on the application field and working principle of this unique opto-coupler type.

The application field of AS1716-ASOT is mainly found in instrumentation and process control systems, where it is used as a single-board safety unit. This slim and light-weight opto-coupler is designed to protect electromechanical sensor and detector systems from dangerous overloads. This opto-coupler can detect small changes in the electric signal between the two line/power sources and then switch off, as necessary, to avoid damaging or short circuiting the system. It is also capable of detecting and blocking a signal return path that could be created by an incorrect connection or a malfunctioning of the electromechanical system.

Working principle of the AS1716-ASOT opto-coupler is rather straightforward. It has two successive relay sleeves, each with a respective PCB track and relay contacts, capable of switching off the electric current traveling along the two different line/power sources. The completion of the electric current path is monitored by two separate LED (light-emitting diode) circuits, between which is a variable non-metallic resistor. The LED circuits detect any changes in the two relay circuits and interact with the variable non-metallic resistor, thus creating an electric potential difference that can be read by the transisitor circuit and the basic electronic components. If a malfunction is detected, the transisitor circuit interrupts the current path between the two line/power sources and the relay contacts are switched off automatically.

In conclusion, the AS1716-ASOT is a special type of opto-coupler that provides a unique solution for sensor and detector interface applications. The unique design of this opto-coupler allows it to detect dangerous overloads, protecting instrumentation and process control systems from potentially damaging or short circuiting. The working principle of the device is fairly simple, as it contains two separate LED circuits, between which is a variable non-metallic resistor, capable of detecting small changes in the electric signal between the two line/power sources, thus automatically switching OFF the relay contacts when necessary.

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