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What factors does the time constant of a thermocouple depend on?
It depends on the mass (m), specific heat (c), convective heat transfer coefficient (h) and the surface area (As) In other words, Time Constant = (m * c) / ( h * As)
How does a thermocouple function?
Y
Example of coefficient?
coefficient
What is an example of coefficient?
2X 2 is the coefficient
What is the coefficient of n plus 3?
The coefficient is the number that multiplies a value. For example, the coefficient of 4x is 4. If n+3 is in brackets in the form (n+3) then the coefficient is one. If not the the coefficient of n is also 1.
What is a Peltier diode?
answer by engr ZOHAIB MUSHTAQ WHEN EMF APPLY AT TWO DIFFERENT ENDS OF METALLIC PLATE HAVING COMBINE JUNCTION HERE ONE END IS HOT AND OTHER END IS COLD THIS EFFECT IS PELTIER EFFECT
Do you need to use TC extension wire to connect a thermocouple or can you use shielded cable?
You must use thermocouple wire (of the same type as the thermocouple) to extend the circuit. If you switch to a different wire the point of connection between the two becomes a thermocouple junction itself, and the resulting voltage from that junction will skew your reading. You can use any wire to extend a thermocouple connection if you know the temperature of the junction where the thermocouple wire ends--this becomes the reference junction.
Can copper wire be used for thermocouple extention?
No. A thermocouple is made from two dissimilar wires. At the junction of these two wires, an electrical signal is generated that is measured in millivolts. If you insert another type of wire, such as copper, then you have introduced another electrical junction. Your signal will be (millivolt from junction 1 + millivolt from junction 2). <><><> Maybe. A thermocouple measures the temperature difference between the sensing junction (where the two different metal wires meet) and the other end of the wire, the reference junction. If you extend a thermocouple with copper wire, you will measure the temperature difference between the junction and the location where the copper extension is spliced on. If the copper splice is the same temperature as the reference junction, or if you can measure the temperature at the splice, then it will be fine. In general, it is better to run the thermocouple wire to the reference junction.
What happens if power is supplied to thermocouple?
Thermocouples convert a delta-temperature to electricity and electricity to a delta-temperature. Passing current through the junction will make one side hot and one side cold. Conversely, applying a delta-T across the junction will make a current flow. Thermo-electric. This is called the Peltier-Seebeck effect.
What is the function of thermocouple?
The thermocouple does not actually measure temperature, but the temperature difference between two points. If the temperature at one point is known (reference junction) then the temperature of the other point (sensing junction) can be calculated.
Thermocouple instruments are also known as?
The thermocouple is a sensore used to measure temperature. The thermocouple are made with two wires of different metals. joined together at one end to from a junction the thermocouple outputs in a a Milli volts .
What are 2 examples of heat or temperature sensors?
-- bimetallic strip -- thermocouple junction
What is a peltier heat sink?
A Peltier junction is the same as a thermocouple junction, except instead of using heat to generate electric current an electric current is forced through it to move heat. Thus in a heatsink unit one junction (on the hot IC) gets cold removing heat and the other junction (on the heatsink fins) gets very hot. Thus it acts like a electric refrigeration system for the IC.It has no moving parts (except maybe a fan) like the compressor and coolant in mechanical refrigerators. It is even reversible to make a heater by just reversing the electric current. Portable electric food cooler/heater units are available, these typically plug into a car cigarette lighter outlet.
What is temperature cofficient in pn junction?
Temperature coefficient of the PN intersection voltage to balance the temperature coefficient of the warm voltage.
Does a thermocouple have to touch at the tip or sides to operate correctly?
All thermocouples (whether type J, type K, type T, etc.) measure the difference in temperature between the Tip (junction between two different metals), and the other end of the thermocouple wire, often referred to as the "cold junction." There must be two such junctions somewhere for the thermocouple to operate correctly; typically the measurement junction is at the tip. To measure the temperature of some thing, try to put that junction as close as possible to that thing. However, since the thermocouple is metallic and the measurement relies on detecting tiny voltages, connecting the tip electrically to a metallic surface could affect the measurement. For that reason thermocouples often have insulated tips.
What is a thermocouple thermometer?
Thermocouple is made up with the junction of two different metals(e.g. antimony and bismuth). This is the device used to measure the temperature due to the fact that when two junctions are placed at different temperature a potential difference developed (thus electrical signal) which is proportional to the difference in the temperature of the two junction. This is very sensitive device.
How does a thermocouple work on a gas boiler?
A Thermocouple is simply a temperature-sensor consisting of a junction between two metals, where the tiny voltage between them varies with temperature. This change in voltage can be detected and acted upon by the electronics controlling such things as boilers.
