A device that is used to detect temperature - the word is a portmanteau of thermometer and resistor. The detection mechanism is the measurement of resistance which changes predictably with temperature.

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66 views

How to find replacement for a discontinued thermistor component?

I am in need of a thermistor with characteristics, such as those of now discontinued KTY84-130 (link to datasheet). I am after the exceptional linearity it features and also temperature range, up to ~ ...
4
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3answers
64 views

What technique is used for thermistors embedded in an IC, and what should I think about when measuring them?

I would like to measure the resistance of a thermistor integrated in an older CPU, the Motorola Freescale NXP 68060, but the documentation is limited. This is all it has to say on the subject: ...
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35 views

can not find detail exxplananion on linearity of NTC thermistor (parallel Resistor across NTC

I am studying smart sensor system and encounter these question. Soil temperature should be measured by using a NTC temperature-sensor. The working point should be at 12°C. At the working point the ...
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46 views

Thermistor linearization

Can somebody explain how this thermistor linearization circuit works?
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1answer
29 views

NTC error propagation: what I missing?

Reading through a Vishay datasheet of a NTC, I found the guide to devise the temperature error: I don't understand why the errors of X and Y, for the non-approximated formula, were multiplied ...
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2answers
72 views

Fast detection of transient temperature change.. RTD? Thermistors? Thermocouples? or something else?

If I want to detect temperature changes on the order of 10ms, what is the best technology to use (besides IR)? I know Thermocouples and RTDs are pretty slow.. not sure about Thermistors.
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98 views

Thermistor resistance to celsius conversion

I'm new to electronics, and experimenting with a thermistor plugged into an Arduino. It is a 4.7k thermistor (full specs) and I'm using it in conjunction with a 10k resistor (product page). When ...
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1answer
46 views

NTC based voltage divider relative error

I'm making an analysis of the error introduced by two different resistors in a voltage divider (and taking the voltage out from the middle of two series resistors). I'm using this for an NTC reading, ...
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2answers
79 views

LUT - Maximum error of linear interpolation approximation

I'm currently using an LUT (Look-Up Table) stored in a microcontroller, to read the temperature from an NTC sensor. I'd like to achieve a precision which is known, it doesn't matter if it is not so ...
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81 views

NTC Temprature Formula

Below I attached an NTC sensor circuit, my question is how can I simply convert analog voltage values to temprature values. I saw some formulas but they seem complex. Can someone share formulas where ...
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2answers
78 views

How can I quickly heat something to a given temperature with nichrome wire, while keeping the wire itself under a given maximum temperature?

I'm trying to heat a fluid to a certain temperature (under 100C) using nichrome wire, with a thermistor measuring the temperature of the fluid to allow controlling the nichrome wire using PWM and a ...
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1answer
344 views

Strange result ADC(Arduino Micro) Thermistor KTY 10-6

Where's the error in the following circuit/code ? Some time ago i got various sensors . One of those was the kty 10-6 (3 pieces). At the beginning i could not find any datasheet or examples about ...
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1answer
42 views

Choosing the correct thermistor

I need help choosing a thermistor. I’m not sure what I need to look for. Let’s say I have this circuit measuring temperature: I have a range of temperatures from 0 to 10 degrees that I need to ...
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3answers
131 views

Suppressing contactor coil inrush, is this possible?

http://www.kvc.com.my/EnterpriseChannel/SharedResources/Datasheet/0/?ProductId=1000066755&Filename=SCHNEIDER-LX4-FH024.pdf I am trying to operate a 24VDC coil with an inrush of approximately 30A, ...
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2answers
150 views

High Precision ADC/DAC Circuit Feedback

This is my first proper circuit I've designed and I'm after some advice. I need a 16 bit DAC, output 0-5V and I need to measure the resistance of a thermistor to 0.1mk accuracy. At the moment, I am ...
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1answer
317 views

How to connect Li-ion batteries with thermistor pin in parallel?

I have a Li-ion charger with 3 contacts: (+) (-) and (TH), based on TP4056 chip. I also have several batteries with corresponding contacts, and the charger does a good job charging them. Now I would ...
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1answer
232 views

Fire Alarm Circuit using transistor

This circuit is working inversely on PCB as compare to Proteus Software. In software, when the temperature increases the buzzer is on. This is the desired output, but on PCB this circuit is working ...
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100 views

Constant current source to heat thermistor rapidly

My goal is to heat a thermistor as rapidly as possible. The thermistor has a resistance value of 10k Ohms at 25 degrees C, and a negative temperature coefficient. If I apply a constant voltage of ...
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84 views

LTC1923 TEC controller

I'm planning to use the LTC1923 to accurately control the temperature of a TEC. By looking at the LTC1923 datasheet, on page 26 the suggested circuit employs an instrumentation amplifier (LTC2053) ...
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4answers
197 views

How to apply HT gradually in a valve amplifier?

For valve amplifiers, it is said, that applying anode voltage before the valve is heated reduces lifetime and can have other negative effects on circuit lifetime. To avoid this, I want to add a ...
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4answers
159 views

Low side high side NTC measurement

I am using 100k NTC from Murata (SMD, 0603 package) for temperature Measurement. I will drive NTC (MCU_Output) only when i need to measure the temperature. Which of the following options is better? ...
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2answers
638 views

Determining The Parameters Of A Wheatstone Bridge

Good day, I am trying to use a Wheatstone bridge to condition a thermistor. The arrangement i have is shown in below. I need the following specifications. 10V output max from the bridge at ...
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1answer
354 views

does changing the cable length of NTC temperature sensor affect accuracy?

I'm using an off-the-shelf STC-1000 temperature controller, popular with homebrewers, that uses an NTC sensor to read temperature and switch on a relay to cool or heat when the sensed temperature ...
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1answer
299 views

Pros / Cons of LM35 and Thermistor, what alternatives?

I'm wondering which benefits/downsides I have using following thermometer? Is there something I'm overseeing? For easy temperature measuring, what would be the easiest? My Opinion is LM35, am I right? ...
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1answer
292 views

How to control the temperature of heating element

I am developing a heating application where temperature need to be constant. I am planning to set the temperature @ 200 degree C. when my sensor find the temperature exceeding the set temperature how ...
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2answers
141 views

Heating a li-ion battery for use in sub-zero temperatures

I have a design that I'm working on that is to be outdoors year round, with a 1 watt solar panel trickle charging a 6 Ah li-ion battery during the day. I expect there to be about 3 to 4 months of ...
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3answers
138 views

Could I use a surface mount thermistor to measure ambient temperature?

I'm working on a project where a device I'm using has this thermistor, a Murata NCP15WF104F03RC, to measure the temperature of the device itself. This is a surface mount thermistor. The implementation ...
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2answers
87 views

Temperature measurement into USB [closed]

I am trying to get a couple of temperatures into my computer. In my little lab I have about 50 thermistors that look a bit like this NTC-Thermistor. I now would like to get the temperature of all of ...
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903 views

NTC Thermistor Resistance Calculation for circuit using Wheatstone bridge, Op Amp & Arduino

I'm trying to work out the formula for thermistor resistance when using Wheatstone bridge/op amp circuit as opposed to a voltage divider circuit. I know for a voltage divider the \$R_t\$ value is ...
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2answers
184 views

Inrush Current Limiter Failure

I work for a company that builds electric motors, within the last few years they've started building control boards from brush-less dc motors. On the incoming power we have an Inrush Current Limiter ...
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2answers
90 views

What physical properties differentiates the classes of PT100?

I know how the accuracies are defined by the various classifications of PT100, eg Class A, Class B etc. What is it that is physically different between them?
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2answers
65 views

Energy Absorption By Series Resistance During Cap Charging

This question formed while trying to size a NTC thermistor to limit the inrush current to a capacitor. Assume the schematic below (with a fixed resistance): simulate this circuit – ...
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3answers
630 views

Re-building a Crock-pot controller - how are the heating elements powered?

After a few good years, my CrockPot gave up. It looks to me that there may be something wrong with electronics, and being and Arduino enthusiast, I thought I could re-build it. The symptoms are that ...
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1answer
475 views

Surge protection for SMPS

Can an NTC (Negative Temperature Coefficient) thermistor be placed before a MOV (Metal Oxide Varistor) for protecting an SMPS from inrush current and voltage spikes? Here is a drawing to clarify my ...
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2answers
489 views

Inrush Thermistor Bypassing

Hi I want to bypass an Inrush Limiter Thermistor. It is between the rectifying bridge and the smoothing capacitors, I was considering using a solid state device. After the rectifer current only flows ...
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2answers
148 views

instrumentation of V-divider dual-thermistor circuit

here's the circuit - voltage divider with 2 matched thermistors ("matched" means close enough that the measured temperatures when thermistors are right next to each other comes close enough for my ...
2
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2answers
171 views

Lots of thermistors but no readout

Back in Sep '12, Olin Lathrop answered a similar question about wiring a digital display to a thermistor, but my situation is slightly different from Jim McDerby's. I too have solar thermal panels ...
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1answer
933 views

How to place thermistor for reading temperature in NiHM single AA cell charger?

I'm laying out a PCB for a NiMH single AA cell charger following the AVR450 Application Note - Battery Charger for SLA, NiCd, NiMH and Li-Ion Batteries but I'm not sure where to place the NTC ...
0
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2answers
181 views

What is this kind of temperature sensor called (Analogue Devices TMP36)?

I am reading about this stuff, and I have found clear definitions of thermocouples and thermistors online, eg on Wikipedia. But then I also found something different, e.g. what they at AdaFruit just ...
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2answers
68 views

School Task with NTC

I need to solve the task shown on the picture. The first part is to calculate the temperature (in °C) from the NTC when Uv = 2V is. This means Iv is infinite. The given Values are: Uq = 12V, R1 = ...
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1answer
136 views

What is the “nominal temperature threshold” (NTT) on a thermistor?

I bought a thermistor together with my Arduino, because I thought it would be a good first project. I should have gone a different way, since it is obviously too complex for my level, but well, now I ...
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2answers
107 views

Max temperature of PTC heater, need tip

I have some difficulty reading specifications for PTC heaters, more specifically the ones on here. I understand that a PTC heater does not, inherently, rise above a specific temperature. In the ...
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2answers
3k views

PWM control of Peltier with Arduino+Thermistor [duplicate]

I currently have this setup and would like to add automatic control over the PWM based on a thermistor reading. Any insights?
0
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1answer
237 views

Where can I find a transistor similar to a 2n 3904?

I have what I believe is a 2N 3904 638 transistor. It measures 50MΩ at around 70°F. How can I find a data sheet on this? How would I go about finding a similar / replacement thermistor? PS: ...
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3answers
7k views

Thermistor control of peltier voltage with Arduino (for DSLR chill box project)

I am mildly familiar with electronics, mostly from playing around with electronics kits as a kid. That was a long time ago, though, maybe as much as 20 years ago. I am currently working on a cold or ...
2
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2answers
221 views

Fast-stabilising skin temperature sensor

We're currently trying to build a portable temperature sensor for the purposes of estimating human core temperature. This is a bit of an engineering problem (more to do with choice of materials than ...
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1answer
260 views

Low Curie Point PTC Thermistor

For a self regulating heater powered by a 12 V battery, I'm hoping to find a ~35 C Curie Point thermistor with a low "cold" resistance (for winter time, << 150 ohms). Most of these PTC ...
2
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1answer
2k views

Peltier heat resistor temperature controller, schematic issue

I've been having a problem with the following schematic: What I need to do: Two temperature controllers in order to create a temperature gradient. The hot side is a a little above room temperature ...
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1answer
158 views

Thermoelectric cooled Avalanche Photodiode sensor PCB

I'm designing a small PCB (max 5x5 cm) to bias and readout from an Avalanche Photodiode. Since the APD response varies greatly with the temperature, I want to use a cheap 12706 TEC together with a ...
2
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1answer
79 views

Table with termistor models with alfa

Hello I'm searching table with thermistors types and alfa (temperature coefficient). I need alfa for this formula : Mt = 1 - alfa/100*(Tmax - 20) I have some old ...