The thermometer is an instrument used to measure the temperature. There are different types that work thanks to the expansion and body pressure, whether liquid, solid or gas, even thanks to the electronic variations noted. Depending on your need such as the measurement of temperature beaches or the nature of the materials to be studied, your profession or the application of your thermometer, this operating principle can vary. Indeed, you will need two kinds of measuring device if you want take body temperature of a sick person or an industrial oven. Whether your use is domestic or professional, you will find on the market three types of thermometer whose operation are different : the electronic thermometer, the liquid thermometer (mercury, alcohol or rapeseed) and the Galileo thermometer. Our specialists in temperature explains you how these thermometers work.
Digital electronic thermometer operation 📲
THE electronic thermometer is probably the most common thermometer in the world. Simplicity of childish use thanks to their probe and tips coupled to an LCD screen, they allow A precise and fast temperature intake. Some digital thermometers are also contactless (the infrared thermometers) and offer remote measurement. Their application is often professional, there are for example a lot of Medical thermometers or kitchen that is electronic; Front, ear, thermometers with probe (external, retractable, cable Or removable) Or trunk. Certain high performance devices used in particular in meteorology or in the scientific field also offer a recorder allowing you to compare complete data beaches, different measurement units, monitoring and reading data via an application, etc.
But let's see together more precisely how an electronic/digital thermometer works.
The electronic thermometer is made up of 3 main elements. The sensor, the computer and the display.
It is the sensor that will measure the temperature and convert it to a measureable signal by the computer. For RTD probes (PT100, PT1000) and the thermists NTC and PTC the resistance of the sensor changes depending on the temperature.
The computer therefore comes to measure the resistance of the sensor To deduce a temperature in Celsius degrees or Fahrenheit degrees.
The display then comes to recover this temperature information via an electrical signal and posters it understandable for humans.
If your thermometer no longer transmits this data, it can be broken or even broken, do not hesitate to consult our article My thermometer is broken: what to do?
Alcohol thermometer operation 🌡
THE alcohol thermometer (which has the same effect as gallium or rapeseed oil) replaces the mercury thermometer known for its toxicity, which the generation of our grandparents already used to measure the body temperature or assess the ambient temperature of a room or refrigerator. THE alcohol thermometer operation is simple: a glass tube maintained on a base graduated by Celsius degrees, is filled with alcohol and nitrogen. When the temperature rises, alcohol expands, takes up more space and rises. When the temperature drops, alcohol retracts, takes up less space and goes down. Nitrogen exerts a very slight pressure on alcohol to maintain it. It is a precise thermometer, be careful not to put it in full sun if you want to measure the outside temperature, because the temperature intake could be altered.
Galileo thermometer operation ⚗️
THE Galileo thermometer has become more a domestic thermometer today, sometimes even considered an object of decoration. You may know this elongated container containing glass bulbs filled with a colorful liquid that go up and go down. But then How does this thermometer work Who hypnotizes us?
It is necessary to know that these glass bulbs do not contain any liquids ... Each of them to its own properties which, depending on the temperature, modify the density of the liquid and the flotation increases or fall in. Each glass bulb with an attributed temperature, it is easy to determine the temperature. The Galileo thermometer is neither precise nor fast, our Experts in measurement recommend that you only use it in decoration. 😉
Your professional thermometer
For Learn more about the thermometer, you can consult our Complete guide On the thermometers in which you will also find information such as our classification of the thermometers in reliability, calibration or the price ranges of thermometers for example.
Depending on your activity and therefore the thermometers you will need daily, their use will not be the same. To choose your professional thermometer you must ask yourself the question “What is a thermometer for?"She is the one who defines the perfect instrument for you. To go further, take directly An appointment with an advisor To choose your professional thermometer.
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