Temperature is a property of a substance related to the amount of heat energy it contains.

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Connecting Solid State Relays To AC Heating Elements - Is this circuit correct?

I'm converting a 1500W toaster to a reflow oven with PID control, but I'd like to focus on the hardware aspect. I've pulled the switches and controls out of the oven and I'm left with something like ...
-2
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2answers
32 views

How can a non-linear temperature resistance characteristics be a problem in sensors

When thinking about signal conversion in temperature sensors how could the non-linear temperature-resistance characteristics be a problem ?
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1answer
44 views

Busbar calculation

I am looking formula and factor involved in calculating DCDB and ACDB busbar calculation in string combiner box. Please share link or example calculating bus bar. choosing proper bus bar effect of ...
2
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1answer
156 views

Calculating maximum power dissipation based on contact area between two metal conductors

I am trying to figure out how to properly calculate the minimum contact surface area based on the maximum required power dissipation. Let me explain.. I am creating a custom semi-circular metal tab ...
2
votes
5answers
138 views

What is the fastest temperature sensor?

I'm making a Sous Vide using Arduino with a DS18B20 temperature sensor. My problem is that the DS18B20 reacts too slowly to temperature changes. For example, if you take it from ice water (1°C) to ...
4
votes
3answers
395 views

Searching for the right temperature sensor with 0.001 [closed]

Is it possible for me to build a temperature sensor with 1mK accuracy? First I think I need to find the right temperature sensor. My problem right now is I can't find a temperature sensor with that ...
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2answers
78 views

Does air flowing over a bulb affect the amount of lumens produced? [closed]

If a bulb is cooled by air flowing over it, would that change the way light is emitted? I see contradicting evidence that air cooling bulbs changes how much light is emitted because the cooler air ...
3
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2answers
133 views

What happens with transistor outside max temperature range?

Suppose I have an IGBT transistor rated for 60A, that has junction temperature range of -55 to 175C. What happens if I do not exceed max current, but I do exceed max temperature? The characteristics ...
2
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2answers
71 views

Tomato Seed Warmer

I wonder if there is a very simple way to control one or two light bulbs in a box that are providing heat for my Tomato seed Propagator sitting on top ... i.e. I need the heat underneath...It would be ...
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0answers
15 views

Effect on ambient temperature on Battery (lead acid, AGM, lithium)

Most of the manufacturers state the number of cycles for batteries at a temperature of 27 degree celsius. My question, how will the batteries (Lead acid,AGM,lihtium) be affected when charged/operated ...
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2answers
46 views

TMP04 Temperature Sensor with Arduino Not going HIGH

I have a TMP04 temperature sensor (3 pin package). It outputs a square wave at approximately 35Hz and the duty cycle can be converted into a temperature reading (see datasheet). It has an operating ...
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3answers
65 views

Accounting for temperature changes in circuit design

In my last post about a simple circuit: +12V -- R1 -- LED1 -- LED2 -- LED3 -- ground A user said: ...you should account for temperature changes and variation between parts. Not all parts (even ...
2
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3answers
443 views

Resistor will heat up on what amount of current?

I tested a 470 ohms resistor with 35mA DC current flowing and my resistor is heating up. On my final design I have created a voltage divider circuit using ...
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2answers
30 views

Cascade Control System - Multi-Stage Temperature Control

I am new to the forum, hopefully you can help :) I am a software engineer trying to put together a control system. My controls background is not strong, I have really only tuned PID loops via trial ...
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votes
4answers
1k views

Is it possible to have a MCU work at -55 degree, with specification of -40 to 85 degree working environment?

I heard that someone mentioned the method of screening: to have 10 MCUs working at -55 degree, and find out the ones which can work properly, throwing the broken ones away. Is the method applicable? ...
0
votes
1answer
61 views

Designing a low-temperature furnace for melting metals [closed]

This is only peripherally an electrical engineering question, but there are no other engineering forums on stack, so forgive me. I am designing a homebrew device to melt low-temperature metals (like ...
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2answers
67 views

Reverse engineering temperature values

I have a black box, where an input exists for a temperature sensor. I connected a 10k NTC and see the following values: ...
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2answers
23 views

Cermet potentiometer temperature coefficients

I'm engineering a system that is temperature-sensitive, between ~-10-30C. I've moved to using cermet potentiometers because of their sub-200PPM/C temperature coefficients. If I wire such a pot with ...
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4answers
299 views

Why does temperature modify the characteristics of a diode?

Everyone knows that temperature affects every semiconductor device you can think of, and diodes are no exception. From the below graph, we can see that the temperature has marked effects on pn ...
2
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1answer
28 views

semiconductor resistor vs resistor in SPICE modeling Altium

I'm doing some SPICE modeling using altium and would like to apply the temperature coefficients of the passive components for a more accurate simulation. However, as far as I know, in altium the ...
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1answer
40 views

Will a 3-32 VDC input signal relay be damaged (or will work) with a 110 VAC input?

I'm looking at getting a SSR-25DA relay (http://www.amazon.com/gp/product/B0087ZTN08/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A1THAZDOWP300U) and using it with a temperature controller that ...
0
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1answer
34 views

Expected repeatability of PT100 temperature sensor

I'm designing a circuit to measure temperature using a PT100 sensor. I'm putting 1mA through the sensor, and measuring the voltage drop. Assuming a perfect voltage measurement, what would be the ...
0
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0answers
35 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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1answer
35 views

IC Thermal shutdown recovery time

Many RS485 transceiver chips have a thermal shutdown when the junction exceeds 150C. Typically they switch back on once the junction temperature drops 15 degrees. How long does that typically take? ...
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0answers
33 views

How to make a Lithium-Ion battery sub-zero proof

I'm planning to use 2 Lithium-Ion batteries in parallel to power my arduino via a step up converter. The batteries get charged using 5W a solar panel during the day. The problem iy, temperatures can ...
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0answers
43 views

Temperature Sensor for Battery Cell

In a battery monitoring project, battery cell's efficiency is to be calculated with a very high accuracy . Also the temperature is to be measured (not necessarily with a high accuracy) for emergency ...
0
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1answer
67 views

temperature loss in a metal surface

A metal cone is heated at certain temperature . say 45 -50 deg C. i placed a thermocouple(k type) over the surface of the metal to measure the heat transferred over the metal surface. The ...
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0answers
34 views

Sensor in terrarium

I am equipping my terrarium with temperature and humidity sensors and wanted to know how to correctly install them. The surface within my terrarium is covered with a layer of epoxy resin and if ...
0
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2answers
58 views

Setting Kanthal Wire [closed]

I have a furnace that is heated by a small Kanthal coil. The core is formed by wrapping the Kanthal wire around an alumina cylinder. One problem we have had is that the wire springs out of shape after ...
1
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1answer
79 views

resistor drift via temp messing with ADC readings in voltage divider

I am voltage dividing 0 to 64 VDC down to 0 to 1.8 volts via a simple voltage divider. I am using 1% resistors. The problem is that the readings from the ADC in my beaglebone black seems to be ...
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5answers
82 views

Welding Thermocouple to Test Sample

I have a 3mm copper test sample that is going to get heated up, and I would like to know how hot it is actually getting. Previously, we have just held the thermocouple close to the sample, but we are ...
12
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2answers
524 views

Is it proper to use an internal layer as a heat bed if I want to warm my multilayer PCB?

I need to design a circuit to warm my PCB. There are many ways to build up such circuit. But I learned from a post "Warming PCB in a low temperature environment" that maybe I can use traces as heater. ...
1
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1answer
99 views

How to design circuits to work under -55 Celsius degree?

Possible related post:Warming PCB in a low temperature environment I am trying to design a circuit which should work properly under -55 degree. There are two options in front of me: to choose ...
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2answers
71 views

Maximum separable distance between Micro-controller and LM35 (temperature sensor)

I am using LM35 temperature sensor to sense temperature of surrounding. I have connected LM35 to Micro-controller through a jumper of about 20 cm. It is working fine. Now I want to increase distance ...
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3answers
80 views

How use DMM thermocouple probe hands-free to monitor heatsink temperature?

I suppose this is more of a lab practice question than electronics per se, but I wonder if there's a standard-ish way to mount the K-type thermocouple that comes with my Fluke DMM so I can monitor the ...
12
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3answers
908 views

What kind of material of PCB should I choose to work at -40 degree centigrade?

I need to design a PCB circuit to work at (or even below) -40 degree centigrade. Normally, I use FR-4 PCB board at room temperature. However, I have learned from the question "What is the minimum ...
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1answer
42 views

Will this temperature compensation work?

I have a circuit and as a part of it I need to measure the battery voltage under a load. Naturally I would need this load to be constant each time I measured it to accurately know the battery levels ...
2
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2answers
90 views

Good Batteries for (way) Sub-Zero Temperatures

I am building a PongSat and I need some batteries that can withstand the temperatures found at very high altitudes. The pongsat is planned to go up to around 100 km altitudes where the temperature is ...
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votes
1answer
77 views

Connector type for precision PT100?

Any advice on how to choose connectors for a 4 wire PT100 (plus shield)? Bearing in mind this is a precision measurement using 1/10 DIN RTD standard, and I'm concerned about thermocouple effects, etc. ...
0
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1answer
53 views

What is under the hood and how different temperature sensors work? [closed]

There are a lot of different types of temperature sensors for various applications. I am mostly interested in human body temperature measurement. After some reading I'vee been able to distinguish ...
0
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1answer
56 views

Controlling an electric water heater

I'm trying to control the temperature of water heated electrically. On devices sold commercially I see that temperature is not being controlled, and the heating elements are either turned on or off ...
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4answers
199 views

Heating a 1km long wire to 110 C using a 12v supply from a car cigarette lighter

I am a complete newbie to anything electrical/electronics. I am doing a project where I need to heat a 1 km long (Nichrome/Kanthal) wire to up to 110 degree Celcius. The only power supply available is ...
0
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0answers
160 views

DHT22 temperature & humidity sensor react slowly to the environment change

I am right now connecting the DHT22 temperature and humidity sensor to the Arduino. It works well to print the temperature and humidity value every three seconds. However, I made a experiment to put ...
3
votes
2answers
60 views

recommended wattage for soldering station

I'm looking at buying a new soldering station and trying to figure out what would be the right wattage. I'm going to soldering everything from electronic components (not much SMD, if any) to 16mm2+ ...
0
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0answers
40 views

MEMS Gyro temperature compensation

For a project that requires the use of a MEMS gyro sensor to maintain a fixed heading, I am trying to implement the ST L3GD20 MEMS chip. Very briefly, it has two internal low pass filters and a high ...
0
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1answer
42 views

Looking for a high temperature potentiometer [closed]

Does anyone know of any potentiometers that are rated up to 500 degrees F?
1
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1answer
69 views

Powering ATtiny85 for temperature sensing

I have been working on a miniature temperature sensing module which buzzes once the temperature crosses a threshold using ATtiny85, lm35 and a pico buzzer. When I power the whole circuit using an ...
4
votes
4answers
133 views

Is there a Formula to Predict Delta Temperature based on previous trend?

I need a way to predict delta temperature curve based on previous trend. I do a lot of heat rise testing on electrical conductors and I would like to be able to atleast get an approximation of the ...
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2answers
101 views

How do you measure the actual package temperature of PCB components?

We have an IR thermometer at work, but sometimes I feel like the results aren't completely accurate due to the beam width (especially on small components) or material emissivity. Another way I've ...
3
votes
1answer
113 views

Regulator circuit design

I need to design a regulator for my thesis, but I really need help, Please! The topic: - A temperature regulator for a small fridge Some details: - the regulator has to control a peltier element ...