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

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SUMMARY

The discussion centers on sealing an LM35 temperature sensor for submersion in propanol. Users suggest various sealing methods, including using silicone sealers, epoxy, and heat shrink tubing. A successful solution involved encasing the sensor in vinyl tubing and capping it with epoxy, which proved effective in preliminary tests. However, the sensor failed to read temperatures below 0°C, indicating a limitation in its application.

PREREQUISITES
  • Understanding of LM35 temperature sensor functionality
  • Knowledge of sealing materials such as epoxy and silicone
  • Familiarity with thermal conductivity and insulation techniques
  • Basic electronics and circuit design principles
NEXT STEPS
  • Research the thermal properties of different sealing materials for electronics
  • Learn about alternative temperature sensors suitable for low temperatures
  • Investigate methods for preventing copper migration in sealed circuits
  • Explore the use of non-contact IR temperature sensors for liquid measurement
USEFUL FOR

Electronics hobbyists, engineers designing temperature measurement systems, and anyone involved in creating waterproof electronic devices.

  • #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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