Temperature sensors (also thermal sensors) are electronic equipment that measures heat degrees in the environment. There are several types of sensors, including;
- Negative temperature coefficient thermistors.
- Resistance temperature detectors(RTD).
- Thermocouple(s)
- Semiconductor-based sensors
Thermal sensors vary in accuracy and precision due to linearity, repeatability or stability. Therefore, you need to consider your accuracy demands before you choose one.
Process Parameters Ltd is a UK based distributor of Industrial Temperature Sensors including Thermocouples, Platinum Resistance Thermometers (also known as RTDs and Pt100) and Thermistor sensors. These devices output signals proportional to the applied heat degree. They rely on a transmitter for conversion of the signal loops into stable, standardized output signals for display on the electronic part. Therefore, the transmitter acts as a connection between the sensor and the electronic component.
How to Calibrate a Temperature Sensor
Calibration of temperature sensors’ is a broad topic considering the number of options available in the market. Due to the technological advancements in metrology, digital transmitters have improved to be more accurate, flexible and relatively intelligent. These improvements to the transmitters have ensured safety and high standards in all ongoing processes. The only important thing in calibration is to eliminate any element that could cause inaccurate results of measurements.
However, calibration also plays a significant role in ensuring the highest possible accuracy levels. It compares the values on the device under test and the reference device. It ensures that the measurement equipment meets safety requirements.
There are a few universal methods. Here are some of the few ways to calibrate a thermal sensor:
Calibrating the Electronics With Simulator
A thermal simulator panel is a commonly used tool for calibrating thermal sensors. It inputs data that is supposed to give simulations as predictions. The results are corresponding thermocouples or resistance compared to the records in accepted national tables. The primary purpose of the simulator is to provide results for comparison to the device in the calibration process.
This method is advantageous since stabilizing the electrical settings is a one-time process. However, the process has one shortcoming; the probe isn’t calibrated. Therefore, another procedure is required to calibrate the probe. There are other alternative methods of calibration that perfectly calibrate both parts.
Calibrating Both the Electronics and the Sensor in a Dry-Well
Block calibrators are powerful heat sources with pockets for probes insertion. The dry-well has in-built thermal measurement equipment used as a reference in calibrating devices, which makes the calibrator better than the other options. When using block calibrators, the probe doesn’t affect the results since it doesn’t come into contact with other materials.
Dry-well calibration setups are a blend of accuracy and portability. They also have a broader temperature range for your test requirements, making them a reliable option for calibration.
This method has several advantages, such as the dry-well’s simplicity, constituting a single instrument setup. It also rules out the need to do two procedures to calibrate both the sensor and the electronics. However, the accuracy of items in calibration depends on the precision of the dry-well’s in-built temperature measuring tool.
Use of a Dry-Well with Reference Thermometer to Calibrate Both the Electronics and the Sensor
This method uses a dry-well inserted with a platinum resistance thermometer as the reference. The test items are inserted into the pocket after the desired temperature is set correctly. Generally, a dry well is a setup of heat supply of monitored quantities. The test item and the reference PRT are aligned in close range but not in contact.
The in-built platinum resistance thermometer simplifies this procedure since only one instrument is under use. Nevertheless, the fact that the accuracy of the calibrated test item depends entirely on the correctness of the platinum resistance thermometer being used makes it inconvenient. An example of a test item calibrated with this method is the Pt100 sensors.
Calibrating Thermal Devices
Although calibrations are most done practically, there is a way where a formula is used to determine exact quantities. With time most items tend to develop flaws; it will be a bit of a fluke to get accurate results.
The methods above vary in different ways. For instance, a calibrator may only be capable of calibrating the sensor, leaving the transmitter and the electronic part. So, it is essential to do a little research before you settle on a particular method of calibrating these thermal devices.
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