[time-nuts] What do people use for measuring temperature?

[Bob kb8tq]

Hi

One interesting “oops” using RTD’s:

They are close cousins of strain gauges. Some RTD designs are *very* close.
Mount them to this or that and they may tell you more about the stress / strain
in the mount than about the temperature. 

You do *not* want to know how many (hundred) temperature test chamber sensors
that particular goof messed up …… 4 sensors per chamber, 8 in a pod, three pods
in the factory here, four pods in the factory down south, Two partials in engineering, 
two partials in QA ….

The answer ultimately was to tear out all the RTD’s and replace them with carefully
tested (= sorted) AD590’s. 

Bob

> On Sep 26, 2020, at 10:48 AM, Joseph Gwinn <joegwinn at comcast.net> wrote:
> 
> On Fri, 25 Sep 2020 22:46:32 -0400, time-nuts-request at lists.febo.com 
> wrote:  Re: time-nuts Digest, Vol 194, Issue 40
> 
> 
>> ------------------------------
>> 
>> Message: 8
>> Date: Fri, 25 Sep 2020 04:50:35 -0700
>> From: Hal Murray <hmurray at megapathdsl.net>
>> To: time-nuts at lists.febo.com
>> Cc: Hal Murray <hmurray at megapathdsl.net>
>> Subject: [time-nuts] What do people use for measuring temperature?
>> Message-ID:
>> 	<20200925115035.504AF40605C at ip-64-139-1-69.sjc.megapath.net>
>> Content-Type: text/plain; charset=us-ascii
>> 
>> 
>> I've got a collection of 1-wire gizmos and USB thumb drives.  They 
>> are great 
>> for many applications but I'm looking for something better/different.
>> 
>> I'd like something that reads to 0.01 degree or 0.001 degree.  I don't need 
>> accuracy.  What I want is reasonable linearity so I can make pretty graphs.
>> 
>> I'd like the actual probe to be small enough so I can poke it 
>> inside gear like 
>> a PC and attach it to a crystal.
>> 
>> I'm looking for a USB or serial connection so I can log the data.
>> 
>> Is there an obvious brand/whatever I should be looking at? thermistor? 
>> thermocouple?  ...
>> 
>> I don't care about a display on the device.  I don't want a logger, 
>> they fill 
>> up.  I want to grab the data on the fly and do my own logging.  
>> (But I'm happy 
>> to use a logger if it will do what I want.)
> 
> Sounds like you need a Platinum RTD (Resistance Temperature Detector) 
> unit of some kind.  Don't be scared by the word Platinum - these need 
> not be terribly expensive, and are widely used in industry.
> 
> These are industrial:
> 
> .<https://www.omega.com/en-us/resources/rtd-hub>
> 
> .<https://www.omega.com/en-us/sensors-and-sensing-equipment/temperature/sensors/rtd-sensors/p/5RTD-F3100>
> 
> Many bench DMMs have a RTD input.
> 
> Joe Gwinn
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.