Coal Feeders convey a uniform feed rate of crushed coal to pulverizers that then reduce the fuel to powdered form before it is blown into boiler furnaces. Coal Feeders are commonly used in the power generation industry.
Electro-Sensors' Speed Switches are used on Coal Feeders to monitor critical speed, and guard against slowdown or stoppage that can result in costly process downtime, machine damage, and material waste. Speed Switch Tutorial.
A Signal Conditioner is commonly used in this type of application to provide a 4-20 mA output.