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The Butz Thermo-Electric Regulator Company was founded in 1885 when the Swiss-born Albert Butz invented the damper-flapper, a thermostat used to control coal furnaces, bringing automated heating system regulation into homes. [11]
A limit switch with a roller-lever operator; this is installed on a gate on a canal lock, and indicates the position of a gate to a control system A limit switch mounted on a moving part of a bridge In electrical engineering , a limit switch is a switch operated by the motion of a machine part or the presence of an object.
Alerton (sometimes misspelled "Allerton") is a United States company based in Lynnwood, Washington.It is a manufacturer of building automation systems for heating, ventilation and air conditioning HVAC equipment.
A sail switch, vane switch or flow switch is a mechanical switch that is actuated on or off in response to the flow or non-flow of a fluid such as air or water. [1] A sail switch typically operates through the use of a paddle or a diaphragm which gets displaced due to the force of fluid or air moving past it.
In 2019, EPA's mandatory smoke emission limit for wood stoves in 2019 was 4.5 grams of smoke per hour (g/h) under Step 1 of the revised standards of performance for wood burning room heaters. [ 10 ] [ 11 ] Washington State has also had requirements of a maximum of 4.5 grams per hour.
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Within modern distributed control systems and programmable logic controllers, it is much easier to prevent integral windup by either limiting the controller output, limiting the integral to produce feasible output, [5] or by using external reset feedback, which is a means of feeding back the selected output to the integral circuit of all ...
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