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Engineering Reference Materials for Thermistor Schematic
  • What is a Thermistor?

    Thermistors What is a thermistor? 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

  • Thermistor Terminology

    ZERO-POWER RESISTANCE The zero-power resistance is the dc resistance value of a thermistor measured at a specified temperature with power dissipated by the thermistor low enough that any further decrease in power will result in not more than 0.1% (or one tenth of the specified measurement tolerance

  • Thermistor Glossary

    Current-time characteristic: The current-time characteristic is the relationship at a specified ambient temperature between the current through a thermistor and time, upon the application or interruption of voltage to it. Dissipation constant (D.C. or delta ): The dissipation constant is the ratio

  • NTC Thermistor Application Guide

    thermistors are the most sensitive of all temperature sensing elements they are popular in temperature control systems. By using a thermistor in a voltage comparator circuit basic on-off temperature control as well as over-temperature protection can be incorporated. Temperature compensation Many

  • The Truth About Thermistors

    Thermistors were so named by Bell Telephone Laboratories and the name is a contraction for thermal resistors. They are resistors with a high temperature coefficient of resistance and their resistance is a function of absolute temperature. Thermistors are not new. They have been known for about 160

  • NTC Thermistor with a Voltage Comparator

    How to interface a thermistor with a voltage comparator

  
Discussions about Thermistor Schematic
  • Re: What's this component?

    I found one site that has the symbol of an MOV and a Thermistor. http://www.angelfire.com/electronic2/rch/schematic.html Also why does this device have pin numbers polarity? Seems strange an MOV and a Thermistor do not have polarity!

  • Re: What's this component?

    Thanks for the reply Mike, I have to correct those who say these are MOV's, they are NOT, they are a polymer PTC thermistor. An MOV is a clamping device, it clamps the voltage if it exceeds a certain level. These devices are more of a current "clamp", as the current through them rises, they hea...

  • Re: Resistive Current Limiter

    Are you still using this basic schematic? Did you set up the shorting contactor like I suggested back in October? If so, the current limiting resistor need only be in the circuit between the 240V input and the top terminal of Variac #2, basically just to limit the inrush through the portion of wi...

  • Re: Inrush Current

    No schematic (but what a great tool that would be for this forum...). But it isn't that difficult. Wire up a timer to the line power so that it comes on immedaitely when power is applied and a NO contact closes to another larger contactor (35A) coil after 1 second; the magnetizing inrush will be shr...

  • Re: What's This Component?

    Hi Mikerho, On searching I found this similar drawing, is a thermistor, and another drawing this time with the short horizontal line at the bottom-left, is a Varistor. It would make sense to combine these as a surge protection perhaps only accepting current from the electronics to the...

  • Re: Motor Thermistor

    Mikerho, The schematic you posted is for a BLDC motor drive, not an AC VFD; different applications. The apparent thermistors shown in there are likely "Current Limiting" thermistors; a completely different application. In that case, they use the NTC versions because when the drive is first powere...

  
News about Thermistor Schematic
  • Kinetic and Mechanistic Insights into the All-Solid-State Z-Schematic System

    The Journal of Physical Chemistry CDOI: 10.1021/jp509587a

  • Electronic Spark Generator Circuit

    The problem I'm continually faced with is the T1 transformer Burning out, heating, overloading that ends the functioning circuit. http://www.sgscience.dx.am/page2.html The circuit I have used is the second schematic. Everything has been built to spec. The only thing I can think of is b

  • Graphene-Wrapped Rechargeable Lithium-Sulfur Batteries

    By Alessandro Pirolini Schematic of the preparation of a 3-D hierarchically structured graphene-sulfur/carbonZIF8-D composite. Image credit: K.Xi / Cambridge A team of researchers from the UK and...

  • Universal Temperature Sensor IC Linearizes Temperature Sensors with 0.1?C Accuracy

    LTC2983 high-performance digital temperature measurement IC Linear Technology Corporation introduces the LTC2983 high performance digital temperature measurement IC which directly digitizes RTDs, thermocouples, thermistors and external diodes with 0.1°C accuracy and 0.001°C resolution. A high performance analog front end combines low noise and low offset buffered ADCs with all the necessary excitation and control circuits for each sensor. Measurements are performed under the control of a digital engine combining all the algorithms and linearization required for each. The LTC2983 provides a multiplexed high precision interface to virtually any sensor. It precisely measures absolute microvolt level signals from thermocouples and ratiometric resistance measurements from RTDs and thermistors, linearizes the results and outputs the results in °C or °F. Up to twenty analog inputs are available and digitized measurements can be output in Centigrade or Fahrenheit. The SPI interface works with virtually any digital system and a comprehensive software support system with drop-down menus allows easy customizing of the LTC2983. The simple, yet feature-rich, LTC2983 interfaces with a wide variety of temperature sensors, including type B, E, J, K, N, S, R, T thermocouples, 2,3, or 4-wire RTDs, 2.25kΩ to 30kΩ thermistors and temperature sensing diodes. The LTC2983 works with ground referenced sensors without the need for amplifiers, negative supplies, or level shift circuitry. Signals are simultaneously digitized with three, high accuracy, 24-bit Δ∑ ADCs using an internal 10ppm/°C reference. Automatic thermocouple cold junction compensation can be done using any type of external sensor. Included on the chip are linearization algorithms for all common sensor types. Custom sensors can be linearized with custom coefficients programmed into the chip. Dual programmable excitation current sources feature current reversal and current ranging to improve accuracy and reduce noise. To ensure resistive measurements are accurate, current reversal eliminates thermocouple effects in the resistive sensor. Sensor specific fault detection alerts the user of short circuits, open circuits, over temperature, under temperature, and ADC overranging. The LTC2983 is offered in commercial and industrial versions, supporting operating temperature ranges from 0°C to 70°C and –40°C to 85°C respectively. The LTC2983 is available today in a RoHS compliant, 7mm x 7mm LQFP-48 package. Pricing starts at 19.49 each in 1,000 piece quantities. For more information, visit www.linear.com/product/LTC2983.

  • Questions about Multivariable Control, Flow, Valves or PLC Schematics?

    Get Your Answers Here

  
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Product Announcements for Thermistor Schematic
Status Instruments, Inc.
Thermistor Transmitter

PUSH BUTTON Calibration. Thermistor Sensor Input. In-Head Mounting. Temperature Linear Output. Small Spans 10 °F. Re-Rangeable Without A Computer. The SEM203TH Transmitter connects to a standard thermistor and produces a 4-20 mA signal that is linear with temperature. Two models are available. One accepts a 2252 ohm thermistor, the other a 10K ohm thermistor. The transmitter can be mounted in a junction box for attaching directly to the temperature sensor or for surface mounting to a wall...

Thermik Corporation
PTC Thermistors - Highest Quality

Thermik thermistors correspond to DIN 4408, DIN 44082 and IEC 34-11-2, and exhibit a very high temperature sensitivity. The resistance increases strongly in the area of the rated response temperature. This change can be used to switch off the load circuit through a triggering device. Electronic evaluations of many different applications are also possible. Advantages: Small dimensions. Fast response times. Mechanical stability. Temperature-resistance-characteristic-curves individually made...

Cole-Parmer
Digi-Sense Thermistor Meters

Digi-Sense Mini-Thermistor