Industrial Thermometers

Thermometry is the measurement of temperature. Temperature can be measured via a diverse array of sensors and instruments.  Industrial thermometers are used for temperature measurement in many industrial applications. Applications include process temperature monitoring in various industrial markets.  Traditional liquid-in-glass design is typically used due to low cost and ease of use.  Industrial thermometers are basic bulb style thermometers.  Bulb thermometers rely on the simple principle that a liquid changes its volume relative to its temperature. Liquids take up less space when they are cold and more space when they are warm.

Industrial thermometers can have many display scale characteristics.  These include Fahrenheit display, display range and scale divisions, Celsius or Centigrade display, display range and scale divisions.  Industrial thermometers can display temperature in Fahrenheit or Celsius, or both in a dual scale thermometer.  The display range is the minimum and maximum values of temperature that can be displayed.  The scale division is the smallest division of degrees that can be displayed.  Scale division may also be referred to as resolution in digital instruments.  

Important dimensions to consider when searching for industrial thermometers include stem extension, scale length, stem length, and insertion portion of stem length.  A stem extension is a highly thermal conductor that effectively extends the thermometer bulb into the environment.  The scale length is the length of the thermometers readable face.  The stem length is the overall length of the measuring portion of the thermometer. This will include the insertion part of the stem.  The insertion portion is the portion of the thermometer stem that gets immersed into the environment.  Mounting for industrial thermometers can be varied.  They can be mounted in ducts, tanks or process lines; other configurations include handheld.

Mechanical features of industrial thermometers include adjustable angle stem or permanently angled stem, and glass or plastic viewing windows.  Adjustable angled stems can be placed at an angle; where as permanently angled stems cannot be changed.  Stem materials are commonly brass, aluminum or stainless steel.  Thermometer types include mercury or red alcohol spirit fill.  Mercury is commonly used to fill thermometers.  Red alcohol is a fill choice that is safer than mercury.

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Part Numbers for Thermometers