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Topic: Ultrasonication Temperature Measurement  (Read 2037 times)

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Offline HailoMan

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Ultrasonication Temperature Measurement
« on: April 15, 2013, 08:27:46 PM »
Hi all,

Apology in advanced if this is a silly question.
I am running some ultrasonication experiments in the lab and need to measure the temperature of the solution.

Is it safe / sensible to use the standard mercury thermometer for temperature measurement?
I was thinking that mercury might absorb the ultrasound energy better than the solution itself, which can be either dangerous (if the temperature goes up that fast) / give erroneous reading.

Thank you

Offline Arkcon

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Re: Ultrasonication Temperature Measurement
« Reply #1 on: April 15, 2013, 08:54:13 PM »
I'm not sure, but my gut reaction is the same is yours, a hollow glass liquid-filled tube in an ultrasonic bath seems like the potential for problems.  You might want to look into a thermocouple thermometer, or at least be sure your thermometer is alcohol filled instead of mercury.  Also, the thermometer should be in a vessel with the sample, not the bath.  Still, I wouldn't leave the thermometer in place, I'd just check intermittently.
« Last Edit: August 09, 2014, 11:19:01 AM by Arkcon »
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline Mitch

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Re: Ultrasonication Temperature Measurement
« Reply #2 on: April 16, 2013, 12:03:34 AM »
The mercury sounds like a really bad idea. Most EH&S departments will replace them for ethanol thermometers for free.
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Offline HailoMan

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Re: Ultrasonication Temperature Measurement
« Reply #3 on: April 16, 2013, 09:14:27 PM »
Thanks for the responses.
I wasn't planning on putting the thermometer in place continuously, but I was a skeptical on even putting in a glass filled with liquid metal onto ultrasonicator, even if it's intermittent.
I've seen people do it in the lab and I've wondered if it's quite the right thing to do.

Offline curiouscat

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Re: Ultrasonication Temperature Measurement
« Reply #4 on: April 17, 2013, 01:21:05 AM »
How accurate must it be? Thermocouples are cheap these days.

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