Temperature Measurement and Control - Convert Temperature

Jul 25th, 2016
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Temperature Measurement and Control - Convert Temperature ...

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For most people,the comfort zone is afairly narrow temperature range centeredmore-or-less around75 degrees F (23.9 C), which we oftencall "room temperature." Some of ourelectronic instru- .ments are even moredemanding. Crystaloscillators need aclosely controlled~emperature for bestfrequency stability.Standard cells and Zener diode voltagereferences also perform best in a temperature stable environment.In this article, we'lltake a cruise throughthis interesting realmand look at some ofthe devices we use tomeasure and controltemperature. I havesummarized the mostpertinent informationin a ComparisonTable for easy reference.TEMPERATUREtlEASUREtlEllTAllD CONTROLby .Ron TiptonTHE MECHANICALTHERMOSTATith the advent of electric utiliWty companies, central heating and cooling started to appearin our living and work spaces. Andwe needed some means for automatically turning the heat or cooling on and off at our choice oftemperature. The bimetallic stripthermostat was invented to do thisjob.You can make a bimetallicstrip by attaching to each othertwo strips of material with differentexpansion coefficients, such asbrass and iron as shown in Figure1. When the strip is heated, Hiebrass lengthens more than theiron. This curls the strip awayfrom the "cold" contact, breakingthe circuit and turning off theheater. This simple mechanicaldevice is so reliable that it's still awidely used temperature controllerin homes and offices.

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