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Panel indicators and pilot lights are devices used to indicate, alert and aid in the operation of industrial equipment. They typically have two components - an indicator light and a pilot lamp. The lights are typically small incandescent, LED or fluorescent bulbs which indicate the status of equipment. The pilot lamps are used to indicate when power is applied to the equipment and usually take the form of an illuminated switch.

Panel indicators and pilot lights are used in many applications ranging from industrial automation, medical equipment, laboratory setups, domestic appliances and even in consumer electronics like TVs, DVD players and other household appliances. They provide a visual indication to inform operators of when equipment is on or off, warn of maintenance needs, signal that power is being applied or removed and help alert operators of other events happening within the machinery.

Generally, they have a variety of mounting options including surface mount, panel and circuit board mounted and come in a variety of sizes, shapes and colors. The light intensity or brightness can be adjustable and the LED or lamp can be replaced in some models. Depending on the application, they can be used either as an on/off switch or as a meter or gauge to indicate the amount of power being applied to the equipment.

Panel indicators and pilot lights, depending upon the design, are typically powered by the equipment they are monitoring. The most common is 110 volts AC/DC, however, battery-powered units are also available. The indicator often operates off of a DC voltage (typically 12v or 24v). They use a variety of indicators depending on the application and can include buzzers, colour change LEDs, lamps and LCD displays.

The working principle behind panel indicators and pilot lights is simple. When electricity or power is applied to the unit, the current flow activates the indicator, which either stays on, or changes its state to indicate that power is being received. The indicator also can be used as an alarm or warning system.

Panel indicators and pilot lights have a wide variety of industrial, medical, and home automation applications. They are most commonly used to indicate when power is applied to a piece of equipment, to indicate when maintenance is needed, to indicate the status of a device, or to indicate when a piece of machinery or equipment has gone beyond its normal operational life. In addition, they can be used to indicate the temperature, voltage or pressure of the equipment, and also be used in safety systems to indicate if a process is imminent or if a safety device has been activated.

In summary, panel indicators and pilot lights are versatile pieces of equipment used to monitor and alert when power is applied to a piece of machinery or equipment, or to indicate when maintenance is required. They come in a variety of sizes, shapes and colors, and the light intensity or brightness can be adjustable. They are commonly used in industrial automation, medical equipment, laboratory setups, domestic appliances and consumer electronics.

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