A thermostat is device for maintaining a system (apparatus, machine, engine, etc.) at a relatively stable temperature. The first device was developed by Albert Butz in 1886 that gave birth to Honeywell. It allowed to order an air inlet door on a coal boiler to "regulate" its temperature. In 1906, Honeywell developed an already associated with a clock device, hence the birth of clock device (zone control thermostat).
It is stabilized at a constant temperature by means of a linear circuit consists of an amplifier driven by a thermal sensor which sends the appropriate current to a resistor, to keep in balance the temperature of cell containing the quartz oscillator. Using a digital circuit is possible to create a curve optimal for the attainment of thermal predetermined point.
Via an A / D converter, and a firmware consists of a table with hexadecimal codes necessary for driving a D / A converter, it is possible to force the amplifier to provide different amounts of current to heating resistor, according to what is the predetermined temperature value.
Device is a switch that switches to a fixed or a temperature set. In latter case there is question of an adjustable device. This can be used, for example to maintain a certain temperature in a system by switching, such as the regulation of degree of energy source or drain. Something on or off The heart is a simple devices bimetal; it consists of two connected metal strips with different coefficients of expansion. Due to difference in thermal expansion when the temperature changes pulls the whole bent, so that at a certain temperature for a switch is converted.
Vintage cars from the train used for heating another control system with no discontinuity or reliability problems device, which was based on a system of Wheatstone bridge. Device is a component formed by a switch whose on-off action (closed-open) is controlled by a variation of a temperature of a sensor element which is part of component itself. The first device was produced by Scottish chemist Andrew Ure in 1830. It is called device system is capable of transmitting or absorb heat without changing its temperature.
Device is an instrument which has the function of preventing the temperature of a system varies beyond certain predetermined limits. One such mechanism consists basically of two elements: one indicates the thermal variation experienced by system and is called sensor element; the other controls this variation and corrects deviations in temperature, keeping it within desired range. Devices control the temperature of refrigerators, electric irons, air conditioning and many other equipment.
In mechanical devices the sensitive element is a foil or a fluid in which the variation involves a thermal deformation and therefore is the same sensitive element which determines the state of switch. The sensor element can also be a bimetallic strip, which is constituted by two sheets of different materials joined together. Since the two materials have different expansion coefficients, a temperature change results in a curvature of foil which can then act directly as a switch.
In event that use is made of a conventional, non-modulating device (on / off control) is in better models often use is made of one or other type of anticipation, that is to say that device switches off before the set temperature is reached . This is done to avoid too large fluctuations in room temperature by pressing the on / off control behavior prevent device. After all, it takes time to install and space to warm up.
It is stabilized at a constant temperature by means of a linear circuit consists of an amplifier driven by a thermal sensor which sends the appropriate current to a resistor, to keep in balance the temperature of cell containing the quartz oscillator. Using a digital circuit is possible to create a curve optimal for the attainment of thermal predetermined point.
Via an A / D converter, and a firmware consists of a table with hexadecimal codes necessary for driving a D / A converter, it is possible to force the amplifier to provide different amounts of current to heating resistor, according to what is the predetermined temperature value.
Device is a switch that switches to a fixed or a temperature set. In latter case there is question of an adjustable device. This can be used, for example to maintain a certain temperature in a system by switching, such as the regulation of degree of energy source or drain. Something on or off The heart is a simple devices bimetal; it consists of two connected metal strips with different coefficients of expansion. Due to difference in thermal expansion when the temperature changes pulls the whole bent, so that at a certain temperature for a switch is converted.
Vintage cars from the train used for heating another control system with no discontinuity or reliability problems device, which was based on a system of Wheatstone bridge. Device is a component formed by a switch whose on-off action (closed-open) is controlled by a variation of a temperature of a sensor element which is part of component itself. The first device was produced by Scottish chemist Andrew Ure in 1830. It is called device system is capable of transmitting or absorb heat without changing its temperature.
Device is an instrument which has the function of preventing the temperature of a system varies beyond certain predetermined limits. One such mechanism consists basically of two elements: one indicates the thermal variation experienced by system and is called sensor element; the other controls this variation and corrects deviations in temperature, keeping it within desired range. Devices control the temperature of refrigerators, electric irons, air conditioning and many other equipment.
In mechanical devices the sensitive element is a foil or a fluid in which the variation involves a thermal deformation and therefore is the same sensitive element which determines the state of switch. The sensor element can also be a bimetallic strip, which is constituted by two sheets of different materials joined together. Since the two materials have different expansion coefficients, a temperature change results in a curvature of foil which can then act directly as a switch.
In event that use is made of a conventional, non-modulating device (on / off control) is in better models often use is made of one or other type of anticipation, that is to say that device switches off before the set temperature is reached . This is done to avoid too large fluctuations in room temperature by pressing the on / off control behavior prevent device. After all, it takes time to install and space to warm up.
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