[time-nuts] quartz thermometers

Bob Camp kb8tq at n1k.org
Thu Mar 17 07:50:34 EDT 2016


Hi

Indeed they do ….

The target market is mainly down hole oil wells.

Bob

> On Mar 16, 2016, at 7:53 PM, Daniel Mendes <dmendesf at gmail.com> wrote:
> 
> Quartzdyne makes pressure and temperature sensors for the oil industry
> based on quartz xtals:
> 
> http://www.quartzdyne.com/quartz.html
> 
> Daniel
> Em 13/03/2016 01:04, "jimlux" <jimlux at earthlink.net> escreveu:
> 
>> On 3/12/16 7:35 AM, Bob Camp wrote:
>> 
>>> Hi
>>> 
>>> The conventional MCXO uses an AT cut crystal rather than an SC. It
>>> runs on the fundamental and the third overtone. You can build one
>>> with just about any normal fundamental crystal. There are also people
>>> doing OCXO’s sort of the same way. Back when the MCXO came out, it
>>> was about the only way to get a TCXO that had < 1x10^-8 sort of
>>> stability. Now you can get that with a cheap (as in not $5,000 each)
>>> commercial IC based TCXO.
>>> 
>>> 
>>> And heck, if you can tolerate the 1.5W warm up power, you can get ppb
>> sorts of accuracy in a OCXO at 250mW. (Vectron EX421)  They're a few
>> hundred dollars.
>> 
>> The Qtech MCXO is about 100 mW, and somewhat bigger than the EX421 (not
>> much bigger)
>> 
>> The vectron MX-503 is in the 50 ppb range at 40 mW (I don't know how it
>> does the internal compensation.. maybe it uses some other kind of
>> temperature sensor)
>> 
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