<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif">The butie of the MAX 31855 is there is only Thermocouple, (connector) MAX31855, micro !!</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif">No amps etc.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, May 21, 2015 at 10:03 AM, Davies T. <span dir="ltr"><<a href="mailto:t.davies@swansea.ac.uk" target="_blank">t.davies@swansea.ac.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear David,<br>
<br>
Are we measuring temperature on the Celsius or Rankine scale?<br>
Well, that's got that over with.<br>
<br>
Most commercial semiconductor devices are only specified from<br>
0 to 50 Celsius. If you pay a bit more you can get extended temp<br>
ranges e.g. -20 to +70, but beyond that you are looking at very<br>
exotic (and expensive) parts. If you can place the sensor in the<br>
fridge and keep the micro outside, you stand a chance.<br>
<br>
Solid-state sensors e.g. Dallas are out, we are looking at<br>
thermocouples and platinum 100 sensors - with their<br>
associated amps outside the fridge, of course!<br>
<br>
regards<br>
<br>
Timothy Davies<br>
<br>
________________________________________<br>
From: <a href="mailto:hackspace-bounces@swansea.hackspace.org.uk">hackspace-bounces@swansea.hackspace.org.uk</a> [<a href="mailto:hackspace-bounces@swansea.hackspace.org.uk">hackspace-bounces@swansea.hackspace.org.uk</a>] on behalf of David Rankin [<a href="mailto:rankin.dc@gmail.com">rankin.dc@gmail.com</a>]<br>
Sent: 21 May 2015 09:31<br>
To: <a href="mailto:hackspace@swansea.hackspace.org.uk">hackspace@swansea.hackspace.org.uk</a><br>
Subject: [Swansea Hackspace] Help with Tempreture sensor (100Kelvin to 350Kelvin)<br>
ve<br>
<div class="HOEnZb"><div class="h5">Hi All,<br>
<br>
I am just messing around with my Audino and the temperature sensor. I<br>
am wondering if it is this is even possible but I am trying to measure<br>
low temperature sub -100Celsuis<br>
<br>
So being very niave I tried it out in dry ice but when the sensor got<br>
only got close to its limit, I took it out (-35).<br>
<br>
I also looked around for better sensors and found these:<br>
<a href="http://www.scientificinstruments.com/product-detail/model-si-440-silicon-diode-temperature-sensors/" target="_blank">http://www.scientificinstruments.com/product-detail/model-si-440-silicon-diode-temperature-sensors/</a><br>
<a href="http://www.scientificinstruments.com/product-detail/model-si-430-silicon-diode-temperature-sensors/" target="_blank">http://www.scientificinstruments.com/product-detail/model-si-430-silicon-diode-temperature-sensors/</a><br>
<br>
So what I was wondering. Is it even possible to put a aurdiono in a<br>
cold cold fridge and meassure low temprtures with a better sensor? If<br>
not why not?<br>
<br>
Any advice or guidance would be really helpful?<br>
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