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Panel indicators, particularly those using LEDs, play a significant role in any process control system. LED panel indicators allow monitoring of system status in a variety of industries and applications, as they provide visual indication and feedback surrounding machines’ operation. Working principles of LED panel indicators require an understanding of the construction and operation of LEDs, as well as the means for powering them.

LED Components

LEDs are semiconductor devices that emit light when forward-biased, a type of electrical polarity. The device itself is a junction created at the interface of two dissimilar semiconductors, typically an n-type and p-type. The semiconductor junction is called depletion region, and is a region of the diode where the majority of components are absent. When charged, electrons and holes present in the junction recombine and release energy in the form of photons, or light. The materials used to make the LED component will determine its color.

LED Powering

Powering an LED panel indicator is typically done through direct current (DC) voltage. The amount of current and voltage needed to turn on the LED depends on the materials used in their design; for example, common LEDs used for panels indicators typically need 1.8 to 3.6V and 20mA of current to turn on. Usually, a series limiting resistor is needed to limit the amount of current going through the LED.

Encapsulation and Enclosures

LED panel indicator assemblies typically consist of a plastic or metal enclosure that protects the circuitry inside. This outer shell will also provide a means for mounting the device, typically on a panel. LEDs may also be molded onto the enclosure for temperature protection, optics, and to contain the LED’s light output.

LED Panel Indicator Application Fields

LED panel indicators are commonly used in a number of industries for various applications. In process control industries, LED panel indicators are typically used to monitor pressure, temperature, level, or the position of actuators or switches. They are also used to indicate whether a system is in operation or in alarm mode. LED panel indicators have also been used by the lighting industry to provide fast, reliable feedback to users.

Working Principles of LED Panel Indicators

LED panel indicator assemblies are typically constructed with a series limiting resistor that limits the amount of current going through the LED. The LED emits light when forward bias is applied to the LED, and the amount of current and voltage needed to turn on the LED depends on the materials used. The outer shell of LED panel indicator assemblies also provide a means for mounting and containing the LED’s light output. Thus, LED panel indicators are used in a variety of industries and applications to provide visual feedback surrounding system and machine operation.

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