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A thermistor is a temperature measuring device which acts like a temperature sensitive resistor. It is an active device that requires a current flow to measure its resistance so that the temperature may be calculated and/or displayed.
A thermocouple is a device composed of two dissimilar metals fused together. An electrical potential occurs across the junction of the metals. As the potential is influenced by the temperature of the metal junction the output voltage can be measured and calibrated to show the temperature at the joint.
Both devices may be employed to measure the temperature within a fixed space, or on a probe to measure the temperature at a remote point or points.
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A thyristor, also known as a silicon controlled recitifier (SCR) is a uni-directional device. Under normal operating circumstances, it will pass current in one direction, only
A thermistor is a type of resistor whose resistance varies significantly with temperature, more so than in standard resistors
A: A thermocouple is created from wires of two different metal welded together to form two junctions. These two junctions will generate a dc voltage according to the temperature difference between the junctions.
A thermistor is a resistor that will change resistance as temperature is impressed on it.
A thermistor measures temperature. A thermocouple measures temperature difference between two points. To measure temperature using a thermocouple, you need to know the temperature of one of the points.
The two junctions are sometimes called the "hot junction" and "cold junction." It used to be standard to put the cold junction into a known temperature environment--often an ice water bath, since that is known to be 0 degC. The hot junction is then located at the point where temperature is to be sensed.
Thermocouple voltage vs. temperature difference is non-linear and the voltage difference varies depending on the materials used to create the thermocouple. For example, for a chromel-alumel TC (called Type-K), the curve is a 9th order polynomial. To convert voltage to temperature, either the polynomial must be calculated for each measurement or entries in a table used.
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Difference between sensor and Acatuars?
A sensor is a device that is programmed to send a signal as soon as a specified event occurs; for example the motion sensor in supermarket doors. Meanwhile, an actuator is a device that does an especifc action according to a signal received. Lets go back to the door: Once the motion sensor detects a movements, it send a signal to a piston that moves the door. To sum up: sensors detect events and actuators perform an action
How is thermal overload protection done in stator windings of motor?
one way is to use RTD sensor put inside the motor windings. The RTD sensor is connected to an electronic thermal overload relay. This type of relay can provide running temperature of the motor, on the electronic thermal over load relay display panel. RTD sensor is a wire wound resistor that changes resistance depending on the temperature
What is the difference of ntc sensor and lm35?
NTC is negative temp coefficient transducer,working with resistor while lm 35 is an IC type transducer
What is an analog sensor?
An analog sensor is a device that measures an analog quality (such as temperature, wind speed, sound frequency or velocity). Many of us fail to recognize the difference between qualitative and quantitative measurements. Quantitative descriptors are actually just the result of counting something; seventeen marbles, five folding chairs, three apples... Qualitative descriptors are the result of estimating something; eight cups of sliced apples, a five pound bag of marbles, the current room temperature. When we use a scale to measure something, it's called "qualitative"... or analog. Converters are available that allow a computer to achieve a close approximation of an analog measurement, but for the computer to use the value it must first be converted to a digital signal. Inside the computer, that digital signal is all ones and zeroes, but many of them can be put together to represent a very large number. If that doesn't help, perhaps a basic physics class or even a computer "digital logic" class might be beneficial.
What is a delta pressure sensor?
It is a slang tern given to a Differential Pressure Sensor or Transducer.
