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Thermistors and Thermistor Elements and Thermistor Probes A thermistor is a temperature-sensing element composed of sintered semiconductor material which exhibits a large change in resistance proportional to a small change in temperature. Thermistors usually have negative temperature coefficients which means the resistance of the thermistor decreases as the temperature increases. Finished thermistors are chemically stable and not significantly affected by aging. www.omega.com /prodinfo/thermistor.html   (242 words)

Thermistors, Probes, PTC and NTC temperature sensors for military and commercial applications, by Quality Thermistor ... Thermistors, Probes, PTC and NTC temperature sensors for military and commercial applications, by Quality Thermistor Inc. QTI has an extensive library of thermistor specifications as well as a complete test lab that can be used to test and identify hard to find or obsolete parts. Quality Thermistor is your source for axial leaded, radial leaded and surface mount NTC & PTC thermistors. www.thermistor.com   (165 words)

Measuring Temperature All resistors vary with temperature, but thermistors are constructed of semiconductor material with a resistivity that is especially sensitive to temperature. That's due to the properties of the semiconductor material that the thermistor is made from. The thermistor can be placed anywhere in the bridge with three constant resistors, but different placements can produce different behavior in the bridge. www.facstaff.bucknell.edu /mastascu/eLessonsHTML/Sensors/TempR.html   (605 words)

NTC Thermistor Products Information | NTC Thermistors | PTC Thermistors | Temperature Sensors from WECC Because the resistance vs. Temperature characteristic to the NTC thermistor is nonlinear, it is often advantageous to lineraize the curve. The relatively high initial resistance of the thermistor acts to limit the inrush current until the power it is dissipating heats it to a high temperature. Since most thermistor materials are very nearly ohmic at any given temperature, the minimum no load resistance of the thermistor is calculated by dividing the peak input voltage by the maximum permissible surge current in the power supply. www.wecc.com /ntceng.htm   (696 words)

Thermistor Summary A thermistor is a type of resistor used to measure temperature changes, relying on the change in its resistance with changing temperature. The dissipation constant is a measure of the thermal connection of the thermistor to its surroundings. For example, the thermistor may be used as a flow rate sensor, since the dissipation constant increases with the rate of flow of a fluid past the thermistor. www.bookrags.com /Thermistor   (1304 words)

What is a thermistor and how do they measure temperature Thermistors are thermally sensitive resistors whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in body temperature. A thermistor's change in electrical resistance due to a corresponding temperature change is evident whether the thermistor's body temperature is changed as a result of conduction or radiation from the surrounding environment or due to "self heating" brought about by power dissipation within the device. When a thermistor is used in a circuit where the power dissipated within the device is sufficient to cause "self heating", the thermistor's body temperature will be dependent upon the thermal conductivity of its environment as well as its temperature. www.pc-control.co.uk /thermistor.htm   (413 words)

Thermistor Measurement Hardware & Software for many Thermistor Types Measuring a thermistor temperature involves a voltage divider circuit with a shunt resistor of known value, applying a voltage across the pair and measuring the voltage across the thermistor, as illustrated above. The voltage across the thermistor is measured between a pair of instruNet Vin+ and Vin- input terminals while the excitation voltage for the divider is supplied by the instruNet Vout terminal. The error from the self-heating of the thermistor itself would be be tiny as well at 1.5e-5 degrees C. Notice that the excitation voltage, the shunt resistor resistance, and the measured temperature range all effect the accuracy calculation. www.instrunet.com /applications/tm/thermistor.html   (1223 words)

Capgo - Thermistor Temperature Sensors Thermistor temperature sensors are constructed from sintered metal oxide in a ceramic matrix that changes electrical resistance with temperature. The thermistor's resistance to temperature relationship to temperature is given by the Steinhart and Hart equation: Related to the thermistor temperature sensor is the "Posistor" or positive temperature coefficient thermistor (PTC). www.capgo.com /Resources/Temperature/Thermistor/Thermistor.html   (783 words)

Thermistor Macro - Fall 1998 A thermistor is a thermally sensitive resistor that changes its resistance with changes in temperature in a predictable manner. Thermistors are used for such applications as temperature measurement, temperature control, power measurement, amplitude stabilization, and timing circuits. where R is the resistance of the thermistor, Rnom is the nominal resistance, B1 is the material constant, T is the thermistor body temperature, and Tnom is the nominal temperature. www.spectrum-soft.com /news/fall98/therm.shtm   (815 words)

Sensor   (Site not responding. Last check: 2007-10-11) Thermistor is available in a wide range of types to meet your demands for small size and high reliability. The B value for the thermistor characteristics is not fixed, but can vary by as much as 5K/ºC according to the material composition. A constant expressed as the time for the temperature at the electrodes of a thermistor, with no load applied, to change to 63.2% of the difference between their initial and final temperatures, during a sudden change in the surrounding temperature. www.mmea.com /thermistor/t_sensors/properties/index.htm   (748 words)

Thermometrics: Thermistor Terminology Stability of a thermistor is the ability of a thermistor to retain specified characteristics after being subjected to designated environmental or electrical test conditions. The temperature-wattage characteristic of a thermistor is the relationship at a specified ambient temperature between the thermistor temperature and the applied steady state wattage. A thermistor is a thermally sensitive resistor whose primary function is to exhibit a change in electrical resistance with a change in body temperature. www.thermometrics.com /htmldocs/glossary.htm   (424 words)

Glossary - PTC Thermistors - PTC Thermistor Negative temperature coefficient (NTC): A NTC thermistor is one whose zero-power resistance decreases with an increase in temperature. Temperature-wattage characteristic: The temperature-wattage characteristic of a thermistor is the relationship at a specified ambient temperature between the thermistor temperature and the applied steady-state wattage. Thermistor: A thermistor is a thermally sensitive resistor whose primary function is to exhibit a change in electrical resistance with a change in body temperature. www.rtie.com /ptc/glossary.htm   (1490 words)

Thermistor Application Examples Thermistor Thermometers, Liquid Level Indicator, Temperatur Compensation, Surge ... NTC thermistors are being used successfully to compensate temperature in a circuit where a positive temperature coefficient prevails. In this correction application, the thermistor would be shunted with a resistor whose combined temperature coefficient would produce a negative slope of the same magnitude as the positive slope of the coil. The thermistors are generally inserted into two separate sections to be monitored and are operated in a self heat mode. www.wuntronic.de /sensors/therm_appl.htm   (736 words)

Thermistors The thermistor trip temperature determines the temperature at which the thermistor resistance rises to a very high value, thus tripping the controller. Thermistors are normally installed in the end turns of the motor. The thermistors wired in series can be either wired in series internal to the motor with only two leads brought out (usually for Canadian orders), or wired in series in the outlet box so that all six (6) leads are brought out of the motor. www.usmotors.com /Products/ProFacts/Thermistors.htm   (623 words)

Solar Light Company - PMA2160 Thermistor Temperature Probe Interface The thermistor probes are factory calibrated so they can be easily interchanged without compromising accuracy of the measurement. Since the resistance is easily measured the thermistors are commonly used as temperature transducers. The relationship between temperature and resistance of the thermistor is highly non-linear. www.solar.com /pma2160.htm   (443 words)

Thermistor Calculation Examples Thermistors are generally described as thermally sensitive resistors whose characteristics exhibit large changes in resistance with a small change of body temperature. As the thermistor body temperature rises from self heating, the resistance drops while the current continues to rise. A larger body thermistor will have a greater mass and consequently a larger dissipation constant which in turn will slow down the time required to reach the steady state condition. www.wuntronic.de /sensors/therm_cal.htm   (400 words)

Usage of Thermo-sensitive devieces and Thermisitors 2 A thermistor is a thermo-sensitive element which resistance value changes to the temperature. The characteristics of the negative temperature coefficient thermistor are given in the equation. A negative temperature coefficient thermistors is used to sense the temperature and control the voltage applied to the panel. www.koaproducts.com /english/application/ap6.htm   (361 words)

Thermistor Standards  - Temperature Probes For long-term stability, the thermistor is aged at various temperatures for 16 weeks. The 5640, 5641, and 5642 thermistor probes are designed for the temperature range of 0 °C to 60 °C. The 5643 and 5644 probes span the 0 °C to 100 °C temperature range. Thermistor standards are rugged, precision sensors suitable for use as secondary or working temperature standards for laboratory metrology applications. www.hartscientific.com /products/5640.htm   (535 words)

The basics of solid state devices The first thermistor is installed in the path of flow; the second thermistor is shielded away from the flow. The thermistor switches from a low resistance to a high resistance when the circuit switch is opened; this provides effective arc suppression. If the PC board on which the thermistor as well as other components are mounted cannot be kept away from the water, a temperature testing unit should be used as the standard temperature source. ecmweb.com /mag/electric_basics_solid_state_3   (1003 words)

Thermometrics: What is a Thermistor? Thermistors are thermally sensitive resistors and have, according to type, a negative (NTC), or positive (PTC) resistance/temperature coefficient. PTC thermistors are temperature dependent resistors manufactured from barium titanate and should be chosen when a drastic change in resistance is required at a specific temperature or current level. Composite Thermistors can be custom-designed to match the electrical and thermal characteristics of gauges and probe housings. www.thermometrics.com /htmldocs/whatis.htm   (345 words)

NTC Thermistor applications, advantages, descriptions.   (Site not responding. Last check: 2007-10-11) The usefulness of NTC Thermistors comes from its wide variety of physical shapes and sizes and from the wide range of resistance values available. An NTC Thermistor is chosen for accurate temperature measurement when remote sensing is required, small size is desired, or where small temperature differences need to be measured. Since NTC Thermistors are the most sensitive of all temperature sensing elements they are popular in temperature control systems, particularly, where precision control is necessary. www.ametherm.com /ntc_desription.htm   (224 words)

NTC and PTC Thermistor Temperature Sensor, Thermistor Temperature Probes and Instruments Suppliers and Vendors Thermistors are special solid temperature sensors that behave like temperature-sensitive resistors; hence their name is a contraction of "thermal" and "resistor". Thermistors are used inside many other devices as temperature sensing and correction devices as well as in specialty temperature sensing probes for commerce, science and industry. Thermistors typically work over a relatively small temperature range, compared to other temperature sensors, and can be very accurate and precise within that range, although not all are. www.temperatures.com /thermivendors.html   (1380 words)

PMA2160 Thermistor Temperature Probe Interface The PMA2160 is an interface that permits a thermistor temperature probe to be attached to the PMA2100 meter. Thermistor is device that changes its electrical resistance in response to changes in ambient temperature. The Surface temperature probe (PMA2161) can be used in situations where the temperature of a solid mass is needed, as in a semiconductors heat-sink or to monitor skin temperature. www.solarlight.com /products/pma2160.html   (476 words)

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