Temperature measurement comes down to thermometric property measurement, and it works by bringing two bodies to the same equilibrium heat, and the temperature shown by the instrument is also the temperature of the body with which it is in contact.
When measuring the temperature of an object, heat is transferred between the object and the thermometer while they are not in equilibrium temperature, the thermometer measures the equilibrium and not the actual temperature of the object and therefore inaccuracies occur.
If you are doing a job that requires you to use a thermometer, below we will give you useful information that you need to know.
TYPES OF THERMOMETERS
Today, thermometers can be found at every step, they have become an instrument that means a lot to us and makes our job easier. The outside temperature is measured by the meteorological station and the results are available to us everywhere today, but how to measure, say, the inside temperature of the room or the radiator itself? Of course, thermometers help us with that today.
There are different ones types of thermometers and the ways in which measurement results are expressed. We have several thermometric properties that are suitable for measuring temperature:
- volume increase (mercury, alcohol or gas)
- pressure change (gas thermometer)
- electrical resistance change (resistance thermometer)
- length change (bimetal thermometer)
- changes in the frequency of electromagnetic radiation of the body (pyrometer)
Bimetal thermometer is a meter that uses bimetallic tape as a sensor part, and the operation of bimetallic tape depends on the thermal expansion of the metal. It is intended for measurement temperature of non-aggressive pressurized fluids in environmental operating conditions, and the stainless steel model is intended for measuring the temperature of aggressive pressurized fluids in aggressive and atmospheric environments. Bimetal thermometers are cheap and easy to read. The measuring range of bimetal thermometers is from -20 to +400 degrees.
Industrial glass thermometers they are intended for measuring the temperature of liquid and gaseous fluids. These thermometers use the property of changing the volume of a liquid as the temperature increases. Mercury is most commonly used, but other liquids such as alcohol or gas can also be used. Mercury glass thermometers are used for measurements from -40 to +400 degrees.
Resistance thermometers they are intended for measuring the temperature of air and liquid, where a quick reaction to a change in temperature is required. The measuring range of resistance thermometers can be from 0 to 200-300-400 degrees.
HOW TO MAINTAIN AND SERVICE THERMOMETERS?
Like any other device, a thermometer can break down and give the wrong information. When that happens, all you have to do is contact the company that services and maintains the measuring instruments. We advise you to choose a company that has an accredited laboratory by the Accreditation Body of Serbia.
Thermometer servicing includes: degreasing and cleaning of internal and external parts, replacement of worn-out parts, bringing to the accuracy class.
There are several factors that determine the interval between two calibrations, some of which are: the type and recommendation of the thermometer manufacturer, the tendency of data from previous tests, working environment conditions, etc. Regardless of the above factors, if you notice any of the following situations, you need to take the meter to calibration:
- the instrument was overloaded above the allowable limit
- the instrument gives illogical results
- the instrument is not operated according to the appropriate instructions
- the instrument has physical damage
Etaloniranje termometra and equipment testing plays a major role in checking the correctness and accuracy of the gauges. It is for these reasons that various standards, regulations and laws require annual calibration and inspection of equipment, because only with regular calibration of equipment can you guarantee the quality of your product.
Temperature transmitters are devices designed to convert temperature into an electrical signal. They change their resistance as a function of temperature, and this property classifies them as temperature measuring transducers in which temperature measurement is realized on the basis of resistance measurement.
Depending on the nature of the change in resistance as a function of temperature, they are divided into those with a negative temperature coefficient and those with a positive temperature coefficient.
WHERE TO FIND QUALITY THERMOMETERS?
If you are looking for quality thermometers, our recommendation goes to the company. “Fadip – Merna tehnika doo ”which has been one of the most reliable manufacturers of thermometers and other measuring instruments for years.
Take a look at the offer on their website and if something is not clear to you or you have additional questions, call the phone number or send an email, their professional staff will meet you.
Source: Portal o ekonomiji by www.economy.rs.
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