From: "Koster, Sandra" <skoster**At_Symbol_Here**UWLAX.EDU>
Subject: Re: [DCHAS-L] Marketing the Conversion to Non-Hg Thermometers
Date: Mon, 25 Nov 2013 17:40:34 -0600
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: CAD4T1-Wyf1m4nWepKgxx0yciaSYw2wZJPERRoD6vR1Ew5eCmYQ**At_Symbol_Here**
In-Reply-To <18a001ceea16$efdbe9b0$cf93bd10$**At_Symbol_Here**>

It has been my experience that the non-mercury thermometers we got to replace our mercury ones some years back are considerably less accurate than mercury thermometers. For example, we do a steam distillation of limonene/water from orange peels and when we switched we routinely got b.p.'s above 100 degrees. The true result is a bit under 100 degrees and that is a concept we are trying to get across. As another writer mentioned, digital is better. For routine use in our organic teaching labs we use a thermometer like the Thomas traceable lollipop shockproof/waterproof thermometer, 8" stem except that I don't think we get it from Thomas. You can find a picture on Then we get much better numbers in distillations and m.p.'s. I just wish the stem was a bit thicker to fit in our thermometer adapters better but we make do with some o-rings for distillations and a copper sleeve insert in our MelTemps for better heat transfer.

Sandra Koster
Senior Lecturer
University of Wisconsin-La Crosse

On Mon, Nov 25, 2013 at 1:45 PM, Dan Blunk <blunk**At_Symbol_Here**> wrote:


I'm looking for comparison data / recommendations I might use to assuage academic researcher anxiety with respect to swapping their mercury thermometers for spirit thermometers.

Reluctance to give up Hg thermometers is often rationalized by claiming spirit thermometers aren't as accurate or aren't appropriate for as many applications as a mercury-filled thermometer.

I would appreciate suggestions on where I might find performance-based support for spirit-filled thermometers.

I have information regarding comparisons of potential exposure health risk, spill clean-up expense and environmental contamination.

Thanks for your help in finding performance-based support for using spirit filled thermometers rather than mercury filled thermometers,



Dan Blunk PhD, REA 831.459.3541

Environmental Programs Manager

Environmental Health & Safety Office

University of California Santa Cruz

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