Causes and Solutions of Surface Thermocouple Leakage

Causes and Solutions of Surface Thermocouple Leakage

Causes and Solutions of Surface Thermocouple Leakage In the case of

The surface thermocouple is widely used in the fields of textile, printing and dyeing, papermaking, plastics and rubber because of its unique and easy to carry. As a more sophisticated instrument, he does not mean that there will be no problem, he will and other products, such as some failure, such as: leakage. This common problem may make a lot of manufacturers headache it Then here to give you about this leakage situation. In the case of

First, the surface thermocouple leakage is due to:

1. Furnace refractory bricks in the high temperature insulation, in the furnace with a furnace wall into the metal tube with the surface of the thermocouple easy to make the furnace with the surface thermocouple contact, refractory at room temperature is a good insulation , But with the temperature rise, insulation performance will be significantly reduced. Most of the lining of the resistive electric furnace with alumina refractory bricks, with the temperature rise its resistance is also significantly reduced. 2. Furnace wire contact with the surface of the thermocouple, platinum and rhodium surface thermocouple protection tube is alumina ceramic tube, even silk porcelain tube for insulation, insulation at high temperatures have to reduce the performance, resulting in leakage, and finally leaked to Surface thermocouple, so there is an exchange of leakage on the surface of the thermocouple signal.

To solve the problem of surface thermocouple leakage:

1. Keep the surface thermocouple in contact with the refractory bricks. In the case of

2. Ground the negative of the surface thermocouple to eliminate the leakage signal on the surface thermocouple. In the case of

3. Install the filter on the surface thermocouple output. In the case of

4. Ground the ground from the hot junction of the surface thermocouple. In the case of

5. Apply a jacketed heat-resistant steel pipe or silicon carbide tube to the surface thermocouple tube and ground it.