Previous in Forum: Leakage Detection Through Piezoelectric Membrane   Next in Forum: Reason for Both Legs Connected in Wet Leg Level Measurement?
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
13 comments
Rate Comments: Nested
gsuhas
Guru
Safety - ESD - New Member Popular Science - Cosmology - Amateur Astronomer Technical Fields - Technical Writing - Writer India - Member - Regular CR4 participant Engineering Fields - Optical Engineering - New Member

Join Date: Dec 2007
Location: 18 29 N 73 57E
Posts: 1390
Good Answers: 31

High Accuracy Temperature Indicator

09/18/2017 11:15 AM

I need high accuracy temperature indication for water at ambient temperature... range 0 - 50 deg C

The combined accuracy needed including sensor inaccuracy and indicator inaccuracy is better than 0.1 deg C and resolution 0.01 deg C

The sensor should be PT 100 (3 wire) , which can be integral or remote.

Can anyone suggest the supplier ? Fluke makes it which is very costly... almost $1000.
Register to Reply
Pathfinder Tags: accuracy PT 100 temperature
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: High Accuracy Temperature Indicator

09/18/2017 11:21 AM

Google, "High Accuracy Temperature Indicator."
Register to Reply
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#2

Re: High Accuracy Temperature Indicator

09/18/2017 11:35 AM

You might a consider Pt 1000 sensor with appropriate instrumentation.

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply
2
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#3

Re: High Accuracy Temperature Indicator

09/18/2017 12:01 PM

$1000 seems reasonable to me. Particularly if you want real credibility in the data you are taking.

Wait a minute, three wire measurements assume identical errors on the other leg. I guess you don't really want high accuracy then. You only want better accuracy than a two wire measurement.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply Good Answer (Score 2)
Go to Next Good Answer
2
Carl_E
Power-User

Join Date: Nov 2009
Posts: 335
Good Answers: 63
#4

Re: High Accuracy Temperature Indicator

09/18/2017 12:03 PM

1. Those kind of specs warrant a true 4 wire RTD.

2. 'high accuracy' and 'too costly' tend to be mutually exclusive.
Register to Reply Good Answer (Score 2)
Go to Next Good Answer
2
James Stewart
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14331
Good Answers: 162
#5

Re: High Accuracy Temperature Indicator

09/18/2017 1:19 PM

For highest accuracy, you would need a good calibrator for the triple point of water, or solute-free freeze point, and solute-free boiling point at sea level.

You could go with a thermistor (cheaper), but you will sacrifice some accuracy.

If you cannot procure a good calibrator, you will need a thermometer that is certified to a defined standard. In the United States of America, I think we still use NIST traceable ones. At least I do when calibrating other temperature measurements against this secondary standard, such as wastewater measurement.

Pt1000 will offer you more measurement accuracy in the temperature range you are interested in, IMHO.

__________________
 If it ain't broke, don't fix it. Just build a better one.
Register to Reply Good Answer (Score 2)
No more Good Answers. Go to first "Almost" Good Answer
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#6

Re: High Accuracy Temperature Indicator

09/19/2017 2:57 AM

Why?

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#7

Re: High Accuracy Temperature Indicator

09/19/2017 7:49 AM

One should question whether the temperature in a liquid is anywhere the same within 0.01degC. Convection currents and evaporation render the measurement criterion dubious.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
James Stewart
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14331
Good Answers: 162
#8
In reply to #7

Re: High Accuracy Temperature Indicator

09/19/2017 9:49 AM

What you are saying is true while the water is far from equilibrium (i.e.- being rapidly and locally heated, wherein convection, and conduction might not be keeping up with heat input, and evaporation is not able to restore a set temperature related to pressure.

__________________
 If it ain't broke, don't fix it. Just build a better one.
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#9
In reply to #8

Re: High Accuracy Temperature Indicator

09/19/2017 10:32 AM

Exactly. That is why the question stands as to the need for such a remarkable device in the first place. The original poster has withheld that detail from the forum.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Jpfalt
Guru

Join Date: May 2016
Posts: 1746
Good Answers: 87
#10

Re: High Accuracy Temperature Indicator

09/19/2017 11:23 AM

A resolution of .01 and accuracy of .1 seems a bit pointless. Usually in measuring applications the desired accuracy of the measurement is 1/10th that of the desired measurement resolution.

Why would you want a reading of 23.04 if it could actually range from 22.99 to 23.09 and you don't know where in the range it actually is? In actual use, you would want a resolved reading of 23.04 that could range from 23.039 to 23.041.
Register to Reply
James Stewart
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14331
Good Answers: 162
#11
In reply to #10

Re: High Accuracy Temperature Indicator

09/19/2017 11:53 AM

Absolutely true, but sometimes we play trickery, and average a lot of numbers to arrive at central tendency? Yes? No?

__________________
 If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Jpfalt
Guru

Join Date: May 2016
Posts: 1746
Good Answers: 87
#12
In reply to #11

Re: High Accuracy Temperature Indicator

09/19/2017 12:16 PM

Sounds like a reason to fudge temperature numbers...where have we seen that before?
Register to Reply
James Stewart
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14331
Good Answers: 162
#13
In reply to #12

Re: High Accuracy Temperature Indicator

09/19/2017 12:20 PM

Algore Industries?

__________________
 If it ain't broke, don't fix it. Just build a better one.
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
Register to Reply
Have a Different Question?
13 comments

Good Answers:

These comments received enough positive votes to make them "good answers".

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

Carl_E (1); James Stewart (4); Jpfalt (2); lyn (1); PWSlack (3); redfred (1); Tornado (1)

Previous in Forum: Leakage Detection Through Piezoelectric Membrane   Next in Forum: Reason for Both Legs Connected in Wet Leg Level Measurement?

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Instrumentation:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (78 right now)
Show Members
Advertisement