A thermocouple is a temperature monitoring probe. It is usually connected to a meter such as a multimeter.
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2answers
73 views
Does suface area effect thermal coupling design?
I am building my own thermal couplings for a experiment I am doing at home. I want to build a very small thermal generator with them. At each contact point does the amount of surface area involved in ...
2
votes
1answer
44 views
Making a K type thermocouple
It has been said that a K type thermocouple is just 2 wires of different types twisted together (basically). If this is so then can such a thermocouple be made with a copper and steel wire twisted ...
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3answers
79 views
Economical thermocouple amplifier circuit
I'm looking for the most economical circuit that reasonably accurate circuit for amplifying the voltage produced by a thermocouple (so it can be read by an ADC). For the sake of argument, component ...
9
votes
3answers
139 views
Current produced by thermocouples
I can't seem to find an answer to this on Google.
Take a K-type thermocouple for example. The voltage produced is around 41uV/K. I'm wondering how this changes when a load is put across it. What ...
4
votes
1answer
211 views
Handling the output of an AD8495
I am building a circuit with two AD8495 thermocouple amplifiers. I chose them because they are simple to get and quite cheap - there's basically no other reason. Now I need to create an interface ...
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2answers
141 views
Reflow oven AC cable splicing insulation and thermocouple readings
I'm building a reflow oven. I know what I'm doing, I just want to verify my plans to make sure I'm not doing anything stupid before I start.
The idea is to have an arduino (powered externally) ...
4
votes
1answer
651 views
Attaching a Type K thermocouple to a breadboard / prototype board
I'm looking to prototype a low-cost thermocouple interface board. It needs to output a voltage, as opposed to using SPI like several of the ICs I have looked at, since it would be fed into a 10-bit ...
4
votes
4answers
278 views
When should one implement cold-junction compensation in thermocouple applications?
Specifically, when using K-type thermocouples, what sort of accuracy expectations demand cold-junction compensation as opposed to simple calibration?
Clearly there's no substitute for direct ...
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3answers
400 views
Why do temperature-voltage curves of all thermocouple types pass from origin?
Notice that the temperature in the graph is in oC, not even in oK.
0oC is the border between temperatures of water and ice under 1 atm pressure. Why do thermocouples give 0V voltage at 0oC ...
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5answers
2k views
Temperature sensors for an Arduino sous-vide project
I'm creating a PID controller for sous-vide, like this one, and am trying to decide which temperature sensor to get.
Priorities:
Cost: < £25 delivered in the UK
Accuracy: +/- 0.5C
Range: 0 - ...
5
votes
2answers
418 views
How do i protect analog circuit from relay switching noise?
I'm making a thermocouple based temperature controller. The thermocouple voltage is measured by using cold junction compensation IC LT1025 and precision opamp LT1050.
The measurements are read by ...
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vote
3answers
563 views
Thermocouple to ADC - with negative and positive voltages
I am trying to interface a K type thermocouple to the ADC channel of a Microchip part.
I am interested in negative (to -2mV) and Positive ( to + 4mV) voltages but don't know how to feed them into the ...
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votes
2answers
2k views
How can high temperatures be measured with Arduino uno and type k thermocouple with out maxing out 500 degrees C.?
I need to measure temperatures of around 1000 degrees C using an Arduino Uno (later to be used for PID control), but firstly I need to overcome the challenge of measuring temperatures greater than 500 ...
2
votes
1answer
612 views
Thermocouple array for generating free electrical energy?
Thermocouple is a material (junction between two different metals) which generates potential difference in terms of millivolts, isn't it?
Why don't we create a matrix of thermocouples (many ...
4
votes
4answers
1k views
Differences between thermistors and thermocouples
As I understand it, both thermistors and thermocouples are temperature sensors. So what are the advantages/disadvantages of using one over the other to measure the temperature?
What are the specific ...
6
votes
2answers
424 views
Multiplexed Thermocouple Considerations
I have a side-project to read temperatures from 4 thermocouples (K type, around 500F for coffee roaster data logger), and no previous analog experience at these levels.
I've identified two possible ...
4
votes
0answers
208 views
Serial data transfer from Omega DP80 legacy hardware to computer
Can anyone provide me with some guidance on setting up a legacy serial connection on an Omega (brand) thermocouple display? I would like to use the serial data interface (Omega DP80-Ser) to reliably ...
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2answers
211 views
Thermocouple effect on low voltage/current signals in PCB and connectors
As part of my studies, I am designing a measurement setup for measuring leakage current of SMD capacitors in the ranges up to pico Amps.
At the moment I am in research periond and later I will have ...
2
votes
3answers
225 views
Thermocouple connection question
Sanity check: I need to measure the junction temperature (or as close as possible) of an SMD LED. Can I solder the tip of a thermocouple to a leg of the part? Assuming there is no ground loop (the ...
6
votes
8answers
1k views
cheap thermocouples. Homemade?
I need to make a bunch of thermocouples but I don't want to spend a ton buying them pre-made. I only need short thermocouples (like 6-8" long) so if i were to buy them it would be wasting a lot of ...
4
votes
1answer
249 views
More Options for Reading Thermocouple Signals
I've tried a few options for reading the signals from thermocouples over the years.
The cheapest way (component cost) is likely to be DIY, and a lot of work involving lots of analogue stuff that I'm ...
2
votes
1answer
104 views
Understanding extra thermocouple voltage between computer and machinery
I developed my own circuit board which reads temperature from a thermocouple. This board also plugs into a computer via USB and my software communicates with the firmware on the board. It's fairly ...
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1answer
577 views
PCB-mount connectors for thermocouples
Has anyone had good/bad experiences with particular PCB-mount thermocouples?
I need to design a circuit board with a connector I can plug a standard thermocouple connector into.
(and yes, I am aware ...
