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electronic thermometer, check out How Microcontrollers thermistor
probes , Work. For more information on thermometers and related topics, check
out the links on the next page! Two metals make up the bimetallic strip (hence
the name). In this diagram, the green metal would be chosen to expand faster than
the blue metal if the device were being used in food
probes , an oven. In a refrigerator, you would use the opposite setup, so that
as the temperature rises the blue metal expands faster than the green hand
held thermometers , metal. This causes the strip to bend upward, making contact
so that current can flow. By adjusting the size of the gap between the strip and
the contact, you control the temperature. You will often find long bimetallic
strips coiled into spirals. This is the typical layout of a, hand
held probes backyard dial thermometer. By coiling a very long strip it becomes
much more sensitive to small temperature changes. In a furnace thermostat, the
same technique is used and a mercury switch is attached to the coil. The switch
turns the furnace on and off.
Bulb thermometers are good for measuring temperature accurately, but thermocouple
thermometers , they are harder to use when the goal is to control the temperature.
The bimetallic strip thermometer, because it is made of thermocouple
thermometers , metal, is good at controlling things. The principle behind a
bimetallic strip thermometer relies on the fact that different metals expand at
different rates as they warm up. By bonding two different metals together, you
can make a simple electric controller that can withstand pt
100 thermometers , fairly high temperatures. This sort of controller is often
found in ovens. Here is the general layout: Electronic Thermometers It is now
needle probes , common to measure temperature
with electronics. The most common sensor is a thermoresistor (or thermistor).
This device changes its resistance with changes in temperature. A computer or
other circuit measures the resistance and converts it to a temperature, either
to display it or to surface probes , make
decisions about turning something on or off. If you would like to build your own
