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How do you tell if a faulty thermistor?
While some people use a much more exhaustive and precise testing procedure, a very simple test can uncover the most common problems with a thermistor: * measure the resistance of the thermistor at room temperature with an ohmmeter. If this resistance is 0 (short) or infinity (open), then something is connected incorrectly or the thermistor has been destroyed. (These are the most common problems). If that test looks good, then a followup test can uncover nearly all the remaining possible problems with a thermistor: * put icewater in a ziplock bag and press it against the thermistor. Then measure the resistance of the themistor at freezing. The two measured values of resistance are usually adequate to identify what kind of thermistor it is. If both values are practically the same, then it's not really a thermistor -- perhaps someone has accidentally substituted a resistor. If one or both values are not the expected values, perhaps someone has accidentally substituted a different kind of thermistor.
What does a thermistor do that makes it different from a thermocouple?
a thermistor is a temperature sensitive resistor - to measure temperature you must measure its resistance and convert that resistance to equivalent temperaturea thermocouple is a temperature sensitive voltage source(i.e. battery) - to measure temperature you must measure the voltage across it and a reference thermocouple at a known constant temperature connected in series with it and convert that voltage to equivalent temperatureNote: Thermistors do not require reference thermistors, thermocouples do require reference thermocouples at a known constant temperature. Thermocouples are more linear than thermistors, making them easier to read accurately. Thermocouples are available that are far more sensitive to small changes in temperature than thermistors.
Measuring room temperature with a thermistor or RTD?
Thermistors and Resistance Temperature Detectors (RTDs) are both commonly used sensors for measuring room temperature, but they operate on different principles. Thermistors are temperature-sensitive resistors made from ceramic materials, offering high sensitivity and a rapid response time, making them ideal for applications requiring precise measurements in a limited temperature range. RTDs, on the other hand, utilize the predictable change in resistance of metals (commonly platinum) with temperature, providing greater accuracy and stability over a wider temperature range, but generally at a higher cost. Both devices are effective, with the choice depending on specific application requirements, such as accuracy, range, and response time.
How would the ambient temperature affect the resistance values you measrure in a circuit?
Ambient temperature can significantly impact the resistance values measured in a circuit due to the temperature dependence of the materials used. As temperature increases, the resistance of conductors, like copper, typically rises due to increased atomic vibrations that impede electron flow. Conversely, semiconductors may exhibit decreased resistance with rising temperatures as more charge carriers become available. Consequently, measurements taken at different ambient temperatures can lead to variations in resistance readings, necessitating temperature compensation in precise applications.
What is the significance of the constant temperature reference in ohms law?
As temperature affects resistivity, the resistance of a conductor may change if its temperature is allowed to increase. For pure metal conductors, the resistance generally increases as the temperature increases.Ohm's Law ('the current flowing along a conductor, at constant temperature, is directly proportional to the potential difference across that conductor') only applies when the resistance of the conductor is constant so, when verifying Ohm's Law, the temperature must be kept constant, in order to keep the resistance constant.It should be pointed out that the ratio of voltage (U) to current (R) is called resistance (R), and the resistance of a circuit can be found from the equation, R = U/I whether Ohm's Law applies or not -but Ohm's Law itself only applies when the ratio is constant over a range of voltage variation.
Is a NTC thermistor different from PTC thermistor?
Yes, NTC stands for Negative temperature coefficient. This means the resistance goes down as temperature goes up. A PTC has a positive temperature change. As temp goes up, the resistance will increase also.
What component is used to sense the changes in temperature?
The component used to sense changes in temperature is called a thermocouple or a thermistor. A thermocouple consists of two different metals joined at one end, producing a voltage that varies with temperature changes. A thermistor is a type of resistor whose resistance changes significantly with temperature. Both devices are commonly used in various applications for temperature measurement and control.
How the temperature of a thermistor affect the current which is able to flow in the circuit?
According to the different coefficient of resistance change, thermistors are divided into two types: positive temperature coefficient thermistor (PTC), whose resistance value increases with increasing temperature, and negative temperature coefficient thermistor Resistance (NTC), whose resistance value decreases with increasing temperature. We're JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.), an electronic components manufacturer. You may google search "JYH HSU" to find our official website.
What is the working principle of the thermistor?
A thermistor changes it's resistance depending on temperature. Hence Thermal-Resistor. (Thermistor) It is all to do with the crystal structure of the substance the thermistor is made of. Some increase their resistance as temperature rises, called Positive Thermal coefficient, 'PTC'. Others reduce their resistance with increasing temperature, called Negative Thermal Coefficient. 'NTC'. They can be used in a feedback loop of a simple amplifier and switch circuits, to control temperature of a device. They can be calibrated for use in a current loop, to directly measure temperature, like a thermometer. They can be used to stop surges in start up circuits, initially giving a high resistance until things warm up. Or used to apply a large current and then reduce as things warm up. (Like in the old degaussing coils on a colour CRT).
What is the difference between the sensistor and thermistor?
A sensistor is an electronic component that detects and measures specific physical conditions, such as light or sound, and converts them into electrical signals. A thermistor, on the other hand, is a type of resistor that changes resistance according to changes in temperature. While both are sensors, they serve different purposes based on the physical property they measure.
How do you tell if a faulty thermistor?
While some people use a much more exhaustive and precise testing procedure, a very simple test can uncover the most common problems with a thermistor: * measure the resistance of the thermistor at room temperature with an ohmmeter. If this resistance is 0 (short) or infinity (open), then something is connected incorrectly or the thermistor has been destroyed. (These are the most common problems). If that test looks good, then a followup test can uncover nearly all the remaining possible problems with a thermistor: * put icewater in a ziplock bag and press it against the thermistor. Then measure the resistance of the themistor at freezing. The two measured values of resistance are usually adequate to identify what kind of thermistor it is. If both values are practically the same, then it's not really a thermistor -- perhaps someone has accidentally substituted a resistor. If one or both values are not the expected values, perhaps someone has accidentally substituted a different kind of thermistor.
What are electrical methods for temperature measurement?
Electrical methods for temperature measurement include using thermocouples, thermistors, and resistance temperature detectors (RTDs). Thermocouples work based on the principle that the voltage generated at a junction of two different metals is proportional to the temperature difference. Thermistors are temperature-sensitive resistors with a highly predictable resistance-temperature characteristic, and RTDs operate on the principle of the change in electrical resistance with temperature.
What is the function of a thermistor?
A thermistor is a type of temperature sensor that changes its resistance in response to temperature fluctuations. It is commonly used in electronic devices to measure temperature accurately and trigger actions based on temperature changes, such as adjusting heating or cooling systems.
What does a thermistor do that makes it different from a thermocouple?
a thermistor is a temperature sensitive resistor - to measure temperature you must measure its resistance and convert that resistance to equivalent temperaturea thermocouple is a temperature sensitive voltage source(i.e. battery) - to measure temperature you must measure the voltage across it and a reference thermocouple at a known constant temperature connected in series with it and convert that voltage to equivalent temperatureNote: Thermistors do not require reference thermistors, thermocouples do require reference thermocouples at a known constant temperature. Thermocouples are more linear than thermistors, making them easier to read accurately. Thermocouples are available that are far more sensitive to small changes in temperature than thermistors.
Difference between thermistor and temperature sensor?
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.
What does 425 degrees Fahrenheit to in ohms?
Temperature (in degrees Fahrenheit) cannot be directly converted to resistance (in ohms), as they are different units of measurement. Temperature is a measure of thermal energy, while resistance is a measure of opposition to electric current flow in a circuit.
What would you use to measure the temperature variations between different areas of skin on different parts of the body?
To measure temperature variations between different areas of skin on various parts of the body, an infrared thermometer or an infrared camera can be used. These devices allow for non-contact temperature measurement and can quickly capture temperature differences across the skin surface. Additionally, a thermocouple or a thermistor attached to a probe could be used for more localized and accurate readings in specific areas.
