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Panel indicators and pilot lights are devices used to indicate the status of a circuit or system. They are commonly used in industrial control applications, such as process control, machinery control, and HVAC systems. Common type of panel indicators and pilot lights include LEDs, LCD displays, incandescent bulbs, and thermally-controlled pilot lights.

LEDs, or light-emitting diodes, are common panel indicators for process control applications. LEDs use very little power and are extremely efficient compared to other lighting technologies. LEDs are particularly suited for applications that require bright visual status indicators, such as machine status and alarm indication. The small size and low power consumption of LEDs makes them ideal for tight panel space requirements.

LCD displays are used in place of traditional incandescent bulbs for process control. LCDs are more energy efficient, durable, and require less maintenance than incandescent bulbs. The LCD is extremely bright and can be easily read in most lighting conditions. The readout on LCD displays can be easily customized for specific applications.

Thermally-controlled pilot lights are also commonly used in process control applications. This type of pilot light uses a thermal switch to detect changes in temperature and then activate the light. The light remains on until the temperature drops below a predetermined value. This type of pilot light is often used in hazardous locations, such as oil refineries or chemical plants, to indicate the presence of a dangerous condition.

No matter what type of panel indicators and pilot lights are used, they provide important visual feedback for machine and process control applications. By precisely monitoring the status of a system, process operators can make informed decisions about how to best manage and troubleshoot their processes. The ability to quickly and accurately assess the operational status of a machine or system is essential for making sure that the machinery is operating safely and efficiently.