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Fabricating a Heater for the Fishtank

living with the lab. Fabricating a Heater for the Fishtank. ENGR 121. living with the lab. Parts. 22-gage solid core wire 40-inch length. 20 Ω Power Film Resistor Digikey MP915-20.0F-ND or Caddock Electronics TO-126.

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Fabricating a Heater for the Fishtank

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  1. living with the lab Fabricating a Heater for the Fishtank ENGR 121

  2. living with the lab Parts 22-gage solid core wire40-inch length 20Ω Power Film ResistorDigikey MP915-20.0F-ND or Caddock Electronics TO-126 3/32” polyolefin heat shrink tubing (2:1 shrinkage ratio)two 5/8-inch lengths 3/8” polyolefin heat shrink tubing (3:1 shrinkage ratio)6-inch length

  3. living with the lab Tools and Supplies

  4. living with the lab Safety • Wear safety glasses. • Soldering involves high temperatures. Be careful not to touch hot surfaces, including . . . • The tip of the soldering iron • The soldering iron holder • Anything that is touches with the soldering iron (what you are soldering) • Soldering can be a fire hazard. • Don’t solder around flammable substances. • Don’t walk away from a soldering iron that is turned on. • Be aware of the location of the fire extinguisher. • The materials used in soldering may contain lead or other toxins. Solder in a well ventilated space, and try to avoid breathing fumes. • Be aware of others around you when you are soldering, and alert them to any potential hazards (hot surfaces, fumes). • If you are burned, please alert your instructor. Be aware of the location of the first aid kit.

  5. living with the lab Cut and Strip Wire Cut a 40-inch length of wire, and strip about ¼-inch of insulation off each end.

  6. living with the lab Apply Flux and Tin Wire and Resistor Terminals resistor after tinning flux applied to resistor terminals wire after tinning

  7. living with the lab Solder Wire to Resistor

  8. living with the lab Use Heat Gun on Heat Shrink

  9. living with the lab Use Drill to Twist Wire

  10. living with the lab Install 3/8-inch Heat Shrink (insert resistor about ½-inch up into the end of the heat shrink) heat tip last so it will be hot for sealing

  11. living with the lab Seal the Open End of Heater(clamp in vise for about 15 seconds with low to medium clamping force)

  12. living with the lab Using the Heater The heater MUST be immersed in water any time it is turned on; the resistor will become very hot and burn out in about a minute otherwise. There could be a fire hazard if the heater is turned on in the vicinity of flammable substances. Be sure to leave your entire system unplugged from the wall outlet unless you are actively working on it. It would be a good idea to keep the heater unplugged unless you are using the system to control temperature. NOTE: The resistor used here was not designed to be used as a heater. The use of this heater should be limited to students participating in the Living with the Lab curriculum for the specific purpose of heating the water for the fishtank project.

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