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<p class="MsoNormal"><span lang="EN-CA">Thanks for posting this helpful information Chris.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">It appears in the picture that there is a large volume of liquid solution.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">To achieve reliable RH control a slurry with some solid above the level of the solution is required. Otherwise there will be stratification of more dilute solution across the top of the solution leading to a substantially
higher than nominal RH level.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Rob<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu> <b>
On Behalf Of </b>Tacker, Christopher<br>
<b>Sent:</b> Wednesday, October 13, 2021 9:22 AM<br>
<b>To:</b> Lennart Lennuk <Lennart.Lennuk@loodusmuuseum.ee>; nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> Re: [Nhcoll-l] [External] easy way to calibrate temperature humidity sensors<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black">The link online to the paper is <a href="https://nvlpubs.nist.gov/nistpubs/jres/81A/jresv81An1p89_A1b.pdf">https://nvlpubs.nist.gov/nistpubs/jres/81A/jresv81An1p89_A1b.pdf</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Segoe UI Light",sans-serif"><a href="https://nvlpubs.nist.gov/nistpubs/jres/81A/jresv81An1p89_A1b.pdf" target="_blank"><span style="text-decoration:none">Humidity fixed points of binary saturated
aqueous solutions</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#666666">JOURNAL OF RESEARCH of the National Bureau of Standards- A. Physics and Chemistry Vol. 81 A, No.1 , January-February 1977 Humidity Fixed Points of Binary Saturated
Aqueous Solutions<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#A6A6A6">nvlpubs.nist.gov<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black">The paper is also attached. I've included a picture of the setup I use for controlled humidity experiments. I use a HOBO sensor to monitor the humidity and
temperature, inside the lid. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black">Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black">Chris Tacker<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif;color:black">Chris Tacker<i> (he, him, his)</i><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif;color:black">Research Curator, Geology | </span><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black;background:white">Ph.D.,
P.G., </span><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif;color:black"><br>
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<p style="background:white;text-align:start"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black">#staystrongNC</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Nhcoll-l <<a href="mailto:nhcoll-l-bounces@mailman.yale.edu">nhcoll-l-bounces@mailman.yale.edu</a>> on behalf of Lennart Lennuk <<a href="mailto:Lennart.Lennuk@loodusmuuseum.ee">Lennart.Lennuk@loodusmuuseum.ee</a>><br>
<b>Sent:</b> Wednesday, October 13, 2021 3:47 AM<br>
<b>To:</b> <a href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a> <<a href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a>><br>
<b>Subject:</b> [External] [Nhcoll-l] easy way to calibrate temperature humidity sensors</span>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="line-height:12.0pt;background:#FFEB9C"><b><span lang="ET" style="font-size:10.0pt;color:red">CAUTION:</span></b><span lang="ET" style="font-size:10.0pt;color:black"> External email. Do not click links or open attachments unless you
verify. Send all suspicious email as an attachment to <a href="mailto:report.spam@nc.gov">
<span style="color:red">Report Spam.</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="ET"><o:p> </o:p></span></p>
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<p class="xmsonormal"><span lang="ET" style="color:black">Hi!</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black"> </span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black">In our herbaarium we have one quite old and one new temperature humidity sensor.</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black">The data is quite diferent though these sensors are placed in the same spot.</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black"> </span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black">Do you know any good and cheap ways to calibrate those senors?</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black"> </span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black">Best regards!</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black">Lennart Lennuk</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black">Head of collections</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black">Estonian Museum of Natural History</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET" style="color:black">+372 6603404, 56569916</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="ET"> <o:p></o:p></span></p>
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