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  2. 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).

  3. Invensys - Wikipedia

    en.wikipedia.org/wiki/Invensys

    Invensys Limited was a multinational engineering and information technology company headquartered in London, United Kingdom. At its height, the company had offices in more than 50 countries and its products were sold in around 180 countries.

  4. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    An astronomical (or astronomic) timer calculates dawn and dusk times (tracking the sun position) for each day of the year based on the latitude and longitude (or just north/central/south and time zone on more cheaply made ones), and the day of the year (month and date), programmed by the user upon installation in addition to the usual time of day, except in the case of GPS enabled astronomic ...

  5. Thermostatic radiator valve - Wikipedia

    en.wikipedia.org/wiki/Thermostatic_radiator_valve

    A thermostatic radiator valve on position 2 (15–17 °C) Installed thermostatic radiator valve with the adjustment wheel removed A thermostatic radiator valve (TRV) is a self-regulating valve fitted to hot water heating system radiator, to control the temperature of a room by changing the flow of hot water to the radiator.

  6. Photo-lab timer - Wikipedia

    en.wikipedia.org/wiki/Photo-lab_timer

    There is a type of automatic timer manufactured by Kaiser, Philips, and others that by means of a photoelectric sensor (like the one in the photo or mounted inside the easel), is capable of regulating the exposure time according to the light projected by the enlarger, through the negative, on the photographic paper, magnitude inversely ...

  7. Drayton - Wikipedia

    en.wikipedia.org/wiki/Drayton

    Drayton St. Leonard, Oxfordshire, locally abbreviated sometimes to Drayton; Drayton, Somerset; Drayton Beauchamp, Buckinghamshire; Drayton, a former hamlet, later known as Drayton Green, now part of West Ealing, Greater London Drayton Green railway station; Drayton Manor High School; Drayton, the south-east of the parish of Swineshead, Lincolnshire

  8. Power-on reset - Wikipedia

    en.wikipedia.org/wiki/Power-on_reset

    In VLSI devices, the power-on reset (PoR) is an electronic device incorporated into the integrated circuit that detects the power applied to the chip and generates a reset impulse that goes to the entire circuit placing it into a known state.

  9. Cam timer - Wikipedia

    en.wikipedia.org/wiki/Cam_timer

    Using feedback, external time delay, and other sensory circuits, it is possible to build an electromechanical state machine using a cam timer. These are common in washing machines, where the cam timer runs in phases, but also stops and waits for external signals such as a fill level sensor, or a water heating temperature sensor.