Thermocouple voltage compensator

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Discussion Overview

The discussion revolves around the search for a thermocouple voltage compensator, specifically an electrical alternative to an ice bath circuit for T and K type thermocouples. Participants explore options for obtaining or constructing a low-cost solution, with a budget of $30 or less.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant inquires about affordable options for a thermocouple voltage compensator, expressing interest in a DIY approach.
  • Another participant suggests that most thermocouple meters have built-in compensation for ambient temperature, although they express uncertainty about the price range.
  • A participant proposes using a thermistor to measure the reference temperature and compensate manually, questioning the need for an automatic solution.
  • There is a suggestion to consider using an RTD if the temperature does not exceed 200 degrees Celsius.
  • One participant asks about the accuracy requirements for the measurements, to which another responds that a tolerance of 1-3 degrees Celsius would be preferable.
  • A suggestion is made that checking the cold junction temperature with a thermometer might be the cheapest option available.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to achieve the desired thermocouple voltage compensation. Multiple competing views and suggestions remain, with no clear resolution on the most effective or cost-efficient method.

Contextual Notes

Participants express varying levels of familiarity with the costs and functionalities of thermocouple meters and alternative solutions, indicating potential limitations in their knowledge of available products.

Who May Find This Useful

This discussion may be useful for individuals interested in thermocouple applications, particularly those seeking low-cost solutions for temperature measurement without relying on expensive equipment.

danja
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Hey,

Anyone know where I might be able to get a thermocouple voltage compensator (an electrical "ice bath" circuit) for cheap or if I may be able to make one? For a T and/or K type thermocouple. I am looking in the range of $30 or less.

Here is a description of what I'm talking about. Just replacing ice bath with an electrical setup as shown lower down on that page for convenience.

http://www.omega.com/techref/thermoref.html
 
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Hi danja. Any meter used to read thermocouples (that I've ever seen) has this built in. You just connect a single thermocouple to the meter and program in what type of thermocouple you're using and it automatically compensates for ambient temperature. Not sure you can find one for $30 or less, but I'm not that familiar with prices on these things.
 
Q_Goest said:
Hi danja. Any meter used to read thermocouples (that I've ever seen) has this built in. You just connect a single thermocouple to the meter and program in what type of thermocouple you're using and it automatically compensates for ambient temperature. Not sure you can find one for $30 or less, but I'm not that familiar with prices on these things.

Yea, however I am trying to get away without needing one of those meters because they are not so cheap. =)

Just want to be able to use them reliably with a voltmeter or other meter without an ice bath for reference.
 
Ok, I don't know of anything else that does this automatically. Why don't you want to measure your reference temperature with something like a thermistor, then compensate manually?
 
What temperatures are you going up to? If it is less then 200 deg c you could try using an RTD.
 
Q_Goest said:
Ok, I don't know of anything else that does this automatically. Why don't you want to measure your reference temperature with something like a thermistor, then compensate manually?

Jobrag said:
What temperatures are you going up to? If it is less then 200 deg c you could try using an RTD.

Yea, well the reason is that I happened upon some thermocouples for free (well not free, but I was never re-imbursed for them as planned so after the experiment I kept them), and just want an easy way to use them.

I am basically looking for a cheaper version of this:
http://www.omega.com/ppt/pptsc.asp?ref=SMCJ&Nav=temk04

It's just a substitute for onboard circuitry. It would allow me to use a voltmeter and not worry about a reference temperature for measurements.
 
How accurate do your measurements need to be?
 
Jobrag said:
How accurate do your measurements need to be?

No requirements, but preferably from 1-3 degrees C at the worst.
 
The cheapest option is probably to check the cold junction temperature with a thermometer.
 

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