What is armored thermocouple, and how to determine its quality? 2

The methods for determining the quality of armored thermocouples typically include the following:

1. Visual Inspection: First, conduct an external inspection of the armored thermoresistance to check for any obvious damage, deformation, or corrosion.diode

2. Measure the resistance value: Use the resistance range of the multimeter to measure the resistance of the thermistor. Connect the two test probes of the multimeter to the two terminals of the thermistor, then read the resistance value. Generally, the resistance of a PT100 thermistor at 0°C should be 100 ohms. If the measured value significantly deviates from the standard value, the thermistor may be damaged.diode

3. Measuring insulation resistance: A megohmmeter can be used to test the insulation resistance between the resistive element and the outer shell of the armored thermoresistor. If the insulation resistance falls below a certain standard (e.g., it should exceed 100 megohms under a 500V test voltage), it indicates compromised insulation performance and potential issues with the thermoresistor.diode

4. Check the response time: Place the thermistor in an environment with temperature changes and observe whether its output signal responds promptly and accurately  diode