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  2. Water timer - Wikipedia

    en.wikipedia.org/wiki/Water_timer

    The gearbox in a ball valve timer makes a rumbling sound when actuated. The solenoid type switching timers contain a solenoid that relieves pressure on a diaphragm in the water-flow tube or moves a stopper into the water flow area to regulate flow. The solenoid type uses no gears and makes a tapping sound when the solenoid is activated.

  3. Leslie Controls - Wikipedia

    en.wikipedia.org/wiki/Leslie_Controls

    Leslie Controls, Inc., part of the Thermal Fluid Division of Circor International Inc., is a manufacturer of industrial water heaters, control systems and regulators headquartered in Tampa, Florida. It is one of two major manufacturers of train horns in North America, the other being Nathan Manufacturing, Inc. [1]

  4. Programmable logic controller - Wikipedia

    en.wikipedia.org/wiki/Programmable_logic_controller

    Troubleshooting was a tedious process. [4] When general-purpose computers became available, they were soon applied to control logic in industrial processes. These early computers were unreliable [ 5 ] and required specialist programmers and strict control of working conditions, such as temperature, cleanliness, and power quality.

  5. Dashpot timer - Wikipedia

    en.wikipedia.org/wiki/Dashpot_timer

    Dashpot timers are also used in motors, blowers, lighting, public restroom faucets, and control valves as well as in banking, [citation needed] retail, irrigation, and general industrial applications. Common problems with dashpot timers were variations in temperature, the entrance of dirt and other matter into the dashpot system, and general ...

  6. Direct digital control - Wikipedia

    en.wikipedia.org/wiki/Direct_digital_control

    The program features include time schedules, setpoints, controllers, logic, timers, trend logs, and alarms. The unit controllers typically have analog and digital inputs, that allow measurement of the variable (temperature, humidity, or pressure) and analog and digital outputs for control of the medium (hot/cold water and/or steam). Digital ...

  7. Industrial process control - Wikipedia

    en.wikipedia.org/wiki/Industrial_process_control

    Historical milestones in the development of industrial process control began in ancient civilizations, where water level control devices were used to regulate water flow for irrigation and water clocks. During the Industrial Revolution in the 18th century, there was a growing need for precise control over boiler pressure in steam engines.

  8. Industrial control system - Wikipedia

    en.wikipedia.org/wiki/Industrial_control_system

    An industrial control system (ICS) is an electronic control system and associated instrumentation used for industrial process control. Control systems can range in size from a few modular panel-mounted controllers to large interconnected and interactive distributed control systems (DCSs) with many thousands of field connections.

  9. Control system - Wikipedia

    en.wikipedia.org/wiki/Control_system

    Logic control systems for industrial and commercial machinery were historically implemented by interconnected electrical relays and cam timers using ladder logic. Today, most such systems are constructed with microcontrollers or more specialized programmable logic controllers (PLCs). The notation of ladder logic is still in use as a programming ...

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