High precision professional thermometer

5 min read
image 'MAG
Thermomètre professionnel haute précision

For choose the right thermometer professional, whether medical, food or industrial, it is necessary to take into account various parameters and in particular its precision. To measure the temperature of a place, a meat or a patient with precision, it is necessary to understand how does a thermometer work and how do you define accuracy. This also varies from thermometer to thermometer; from the digital thermometer to the non-contact via the probe thermometer, the accuracy captured and the calibration change. The temperature taking experts of Thermometre.fr guide you in discovering high precision components of a professional thermometer.

What defines the accuracy of a professional thermometer?

When looking to acquire a professional thermometer, three elements allow you to obtain high precision: high precision components, calibration and the combination of these two elements. Each of these methods have their own way of working and their advantages and disadvantages.

The high precision components of the thermometer

First, it is essential to understand that the accuracy of a thermometer is the combination of two components; the sensor accuracy and the precision of the electronics that will analyze the signal of the sensor.

When you are looking for a thermometer with an accurate sensor, you will tend to turn to a sensor with a PT100 temperature probe. These are the most common sensor types of platinum resistance thermometers. The term Pt refers to the fact that the temperature sensor is made of platinum, and 100 to the fact that the Ohmic value is 100 Ohms at 0°C.

The accuracy of these sensors is then divided into different “accuracy class”: a class B sensor will have an accuracy of +/-0.3°C at 0°C while a class 1/10B or 1/10 DIN sensor will have an accuracy of +/-0.03°C at 0°C .

As it concerns the accuracy of the electronics that will analyze the sensor signal, it is given directly by the manufacturer of the chosen professional thermometer. For instance, this high precision PT100 thermometer is given for an accuracy of +/-0.2°C.

Finally add the accuracy of the sensor and the accuracy of the thermometer to find the overall accuracy. In our case with a 1/3B probe at +/-0.08°C at 0°C + this same thermometer at +/-0.2°C = 0.08+0.2 = +/-0.28°C of overall accuracy.

Now that you have understood everything 😜, know that the main advantages of high-precision components are first of all in the fact that you do not need to calibrate the device, and that a simple addition of the tolerances is enough to know the accuracy of the thermometer. On the other hand, the precision achieved will not be very high and the inspection bodies will ask you for proof of this precision (obtained only by a calibration certificate attesting to the precision of the device).

Calibrating a thermometer

Pass by professional thermometer calibration allows the use of probes and other standard thermometers. The calibration is measured according to the temperature of use of the thermometer at a time T. Thus you capture the temperature with real precision of the thermometer thanks to the probe.

💡 Let's quickly illustrate our words 💡

If we use a standard class B temperature probe +/-0.3°C at 0°C and a precision thermometer +/-0.2°C, our overall result gives us an accuracy of +/-0.50°C (0.3+0.2 ). A calibration of the thermometer at 0°C will make it possible to know the temperature actually displayed by the thermometer at this temperature. So, the calibration certificate will provide the information below: 

  • Calibration temperature: 0°C
  • Temperature measured by the standard: 0.02°C
  • Temperature displayed by the thermometer: 0.42°C
  • Tolerance: +/-0.05°C

With this information we know that when the thermometer displays 0.42°C the real temperature is 0.02°C with a margin of error of +/-0.05°C.

As these are standard thermometers and sensors, the first advantage is on the price, they are cheaper. However, the accuracy is only good on the temperatures measured specifically for this calibration certificate. The greater the number of points tested, the better the accuracy is known over the temperature range, but the more points tested during a calibration, the more expensive the certificate.

High precision components & calibration

Whether you are a health professional, researcher, industrialist or even a chef, you must meet certain legal obligations which will require you to have a high-precision thermometer for your temperature measurements. Today there are a multitude of types of thermometers (infrared thermometer, hygrometer thermometer, thermocouple thermometer or electronic and digital thermometer) that meet these obligations.

To get a high precision professional thermometer, the specialists of Thermometre.fr therefore recommend that you invest in a thermometer which combines both high precision components as well as a multi-point calibration certificate.

Our best high-accuracy thermometers:

For more information on these professional thermometers, do not hesitate to send us your request. via the contact form and we'll get back to you in less than 24 hours!