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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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∙ 15y ago
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∙ 11y agosaeid omran
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
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∙ 13y agoA: 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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∙ 10y agoThermistor is an integral part of the Temperature sensor. A thermistor can take heat as an input & give output as a resistance.
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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 open loop and close loop system?
Q: What is the difference between 'Open Loop' and 'Closed Loop'? A: When the engine is first started, and rpm is above 400 rpm, the system goes into 'Open Loop' operation. In 'Open Loop', the ECM will ignore the signal from the Oxygen (O2) sensor and calculate the air/fuel ratio based on inputs from the coolant and MAF sensors, but mostly from a pre-programmed table in the memcal. The system will stay in 'Open Loop' until the following conditions are met: 1. The O2 sensor has varying voltage output, showing that it is hot enough to operate properly. (This depends on temperature) 2. The coolant sensor is above a specified temperature about 40oC/104oF. 3. A specific amount of time has elapsed after starting the engine. The specific values for the above conditions vary with different engines and are stored in the mem-cal. When these conditions are met, the system goes into 'Closed Loop' operation. In 'Closed Loop', the ECM will calculate the air/fuel ratio (injector on-time) based on the various sensors but mainly the O2 sensor. This allows the air/fuel ratio to stay very close to 14.7:1.
What is a ntc thermistor?
A NTC thermistor is a temperature sensor that has a "negative temperature coefficient". That means as temperature goes up, the resistance of the device goes down over it's operating range.
How is a thermistor used in a baby incubator?
A thermistor changes its resistance when the temperature changes. This means as the room temperature changes the current in the circuit containing the thermistor changes. This change in current is detected by the heater circuit, turning the heater on and off.
Is a oxygen sensor a thermistor sensor?
No
What does fault code ff16 mean?
Apparently this is an air thermistor fault - an error with the air temperature sensor...
How do you locate iat sensor on Subaru Forester?
It's often a thermistor (temperature sensitive resistor) located inside the MAF sensor housing.
What is the difference between pressure sensor and temp sensor?
One monitors pressure and the other monitors temperature.
What is a air temp sensor?
IAT air intake sensor is a thermistor ( a resistor that varies the value of it's resistance in accordance with temperature changes ) the change in the resistance values will directly effect the voltage signal from the sensor to the PCM/ECM. As the sensor temperature increases, the resistance values will decrease. As the sensor temperature decreases the resistance values will increase.
What is the difference between thrust and force?
In rocket test bench, how to measure the temperature. Where is the temperature sensor place in rocket test bench.
What is the difference between thermostat and thermister?
Thermostat is a mechanical device that reacts to heat. As heat is applied the thermostat contracts and allows water to flow through the system. A thermistor is a thermal resistance sensor that also reacts to heat. There are two kinds, one is a negative coefficient and is a positive coefficient. As heat increases it changes the resistance value of the thermistor. That resistance value is transmitted to the computer and/or temperature gauge. Through computation the computer can can tell what temperature the engine is at to make decisions on how it should be run.
How do temperature sensors work in washing machines?
The temperature sensor is most likely a bi-metal strip type thermostat, or two for different temperatures. Newer machine may use a thermistor.
What is the difference between the temperature sensor and temperature sender on a 1993 Chevy blazer?
temp sensor - sends signals to the computer for driveability temp sender - measures temp and sends to gauge in dash
Why thermistor is used in gas sensor TGS 2611?
It doesn't, allthough the resistive value is dependant on heater temperature the resistance of the sensor changes due to the presence of certain gasses (methane in this case) while the heater element itself facilitates a catalystic reaction in the sensor element. The temperature of the heating element is self-regulated and dependant on heater voltage.
