Temperature accuracy in thermal chambers

Temperature accuracy in thermal chambers

What is the temperature accuracy in thermal chambers?

Surely you also have the problem of temperature and humidity accuracy of laboratory chambers such as: You have come across an oven, incubator, laboratory freezer, laboratory refrigerator or stability chambers and growth chamber. Do you know what is mean when we talk about temperature accuracy in laboratory chambers?

Here, we try to give brief explanations on temperature accuracy in laboratory chambers to prevent future problems such as wrong purchases by creating awareness for consumers.

In order to clarify the issue, it is necessary to mention that in order to obtain high accuracy, we need the correct operation of several parts of the device.

In order to clarify the issue, it is necessary to mention that in order to obtain high accuracy, we need the correct operation of several parts of the device.

Whenever we talk about the accuracy of temperature, it should be clear which of the mentioned items is meant and in what range.

Display resolution:

All devices have a temperature display that shows the temperature inside the chamber. The accuracy of the display means the tolerance with which the display shows the temperature of the chamber.

For example, when the board of the device shows 37 degrees, what is the actual temperature inside the chamber? This difference is called the accuracy of the display. The lower it is, the more accurate the performance of the display.

It is clear that this accuracy has nothing to do with the temperature fluctuation. For example, the device can have a very accurate display, but the temperature inside the chamber fluctuates a lot.

Thermal stability:

Laboratory chambers have a controller that has the task of controlling and keeping the temperature inside the chamber at the user’s desired temperature.

The meaning of thermal stability is the fluctuation rate of the device in the set point temperature. The lower the stability number, the better the performance of the device. Nowadays, controllers are usually digital and use different methods to keep the temperature constant. Although some brands still use mechanical thermostats, which are definitely not as accurate as digital systems. It should be noted that the use of a digital controller or the use of a micro controller cannot guarantee the accurate performance of the controller And other factors such as control method and programming skills also play a role in it.

Although the thermal stability is very important, it has no effect on the isotherm of the device. This means that a device may be able to keep the temperature constant, but the temperature may differ in different parts of the chamber.

uniformity:

One of the most important points in laboratory chambers is uniformity in different parts of the inner chamber. Uniformity means the same temperature in different parts of the device, which is called uniformity or isothermal accuracy.

It is obvious that the lower this number is, the better. Sometimes they use a circulating fan to improve the temperature, but it should be noted that the use of a circulating fan does not have a positive effect on the temperature of the device, and the type of fan, the location of the fan and The elements and the design of the internal structure of the device are also very important in uniformity.

resolution:

One of the things that is sometimes confused with the device’s accuracy is the device’s resolution. The meaning of the resolution of the steps is to measure and display the temperature. For example, a device whose resolution is 0.1 means that it displays and controls the temperature as a tenth of a tenth, and a device whose resolution is 1 degree displays the temperature by one degree. and controls

Obviously, the lower resolution is better. In some devices, the resolution is 0.1 degrees at low temperatures and 1 degree at higher temperatures.

Another important point in discussing the accuracy of the temperature range desired by the user. The thermal accuracy is not the same in all ranges of the device. For example, the device may be very accurate at one temperature (37 degrees) and have a temperature difference at another temperature (54). For this reason, reputable companies state the accuracy of temperature in different ranges separately. With the above explanations, it was found that the high temperature accuracy of the device includes the correct operation of several parts and only high accuracy in one part cannot call the device accurate.

Therefore, announcing the device with an accuracy of 0.1 degrees is fundamentally wrong. Why should it be determined which part this 0.1 corresponds to (display accuracy, thermal stability, uniformity)?

Sometimes it has even been observed that the resolution of the device is referred to as the accuracy of the device and causes problems for consumers.

Sometimes it has been observed that users try to check the accuracy of the device and check the performance of the controller by placing a thermometer inside the device. But it should be noted that checking the thermal performance of the device requires special tools and special knowledge. Therefore, in order to do this, be sure to ask the calibration companies to check the performance of the device.

Calibration companies operate under the supervision of the standards department, and after calibrating the device, they issue a calibration certificate and check the accuracy of the device from different angles and different temperatures.

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