Water-Sealing a Circuit for Submersion: LM35 Temp. Sensor Tips

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The discussion focuses on sealing an LM35 temperature sensor for submersion in isopropanol, addressing concerns about the longevity of various sealing methods. Initial suggestions included using clear nail polish, hot glue, and silicone, but concerns arose regarding their effectiveness in a solvent environment. The user ultimately found success with vinyl tubing and epoxy, creating a water-tight seal that prevented leakage. However, after testing, the sensor failed to register temperatures below 0°C, prompting further exploration of the circuit's design and functionality. The conversation highlights the importance of cleanliness in encapsulation to prevent issues like copper migration.
  • #31
Proton Soup said:
GND should be connected to the node where the batteries come together, plus to minus.

and they're not likely to discharge at the same rate, fwiw.

Good grief, your right Proton. I snafued again.
 
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  • #32
geseundheit ;)
 
  • #33
OK guys, so assuming I attach the GND from the sensor to the node connecting the two batteries, where should I attach the GND from the multimeter? To the same node?

And thanks a lot for the advice guys, you've been very helpful!
 
  • #34
yes, GND is the reference point, 0V
 
  • #35
Thanks proton, I'm going to wait for the parts to arrive then reassemble everything.

I'll let you guys know how it turns out.
 

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