Thermometer

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Thermometers come in a variety of types. They are used to measure the temperature of a gas, liquid or solid.

Liquid Filled Thermometers

LiquidThermometer.jpg

Advantages

  • Accurate
  • Calibration is insensitive to mechanical shock.

Dis-Advantages

  • Fragile
  • Difficult to insert into processes
  • Can not be recalibrated

Bi-Metal Thermometers

BiMetalThermometer1.jpg BiMetalThermometer2.jpg

Advantages

  • Easy to read
  • Easy to insert into proceses
  • Easy to recalibrate

Dis-Advantages

  • Calibration is sensitive to mechanical shock

Thermocouples

IR Thermometers

IRThermometer.jpg

Advantages

  • No contact is required
  • In-expensive
  • Easily measures surface temperature of solids

Dis-Advantages

  • Only measures surface temperature

Thermometer Calibration

For Calibrating low temperature thermometers make a bath of distilled water and crushed ice. Stir this solution for a couple of minutes and your thermometer should read 32F or 0C. Adjust as necessary.

For Hi-Temperature thermometers boil distilled water. Your altitude will effect the temperature of boiling water.

At sea level adjust to 212F or 100C.

At 2000 ft adjust to 208F.

At 4000 ft adjust to 204F.

At 6000 ft adjust to 201F.

at 8000 ft adjust to 197F.

at 10,000 ft adjust to 194F.

Further Reading

http://en.wikipedia.org/wiki/Thermometer