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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...

  
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Product Announcements for Thermistor Schematic
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

Thermik Corporation
Thermistor Sensor -- LTM

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. The typical characteristics of Thermik thermistors are presented in the temperature resistance diagram. Advantages: Small dimensions. Fast...