1、 Instrument Overview:

Vacuum furnace specific thermocouples are specially designed for vacuum furnace users. With the rapid development of the magnetic materials industry, there are more and more users of vacuum sintering furnaces. In the survey of vacuum furnace users, we followed the opinions of a large number of users and added a new product called vacuum furnace thermocouple to be used in conjunction with vacuum furnaces.

The pressure rise rate of imported vacuum furnaces is less than 0.268Pa/h. Due to the use of a solid gasification structure and highly sealed wiring method, the pressure rise rate of the thermocouple is ensured to be less than 0.1Pa/h, which can effectively ensure that the vacuum degree inside the furnace is not damaged. Therefore, this series of products is mainly suitable for temperature measurement of various vacuum furnaces such as high-temperature vacuum and heat treatment, and can replace expensive imported products.

2、 Structural principle:

When two conductors with different compositions are connected at both ends to form a circuit, a thermal current will be generated in the circuit when the temperatures of the two connection points are different. If there is a temperature difference between the working end and the reference end of the thermocouple, the display instrument will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.

The thermoelectric heating of a thermocouple will increase as the temperature at the measuring end rises, and its size is only related to the thermocouple material and the temperature at both ends, and is independent of the length and diameter of the thermoelectric electrode. The appearance of various platinum rhodium thermocouples is often very different due to needs, but their basic structures are roughly the same, usually composed of main components such as hot electrodes, insulation sleeves, protective tubes, and junction boxes.

3、 Performance characteristics:

1. Select platinum rhodium that conforms to the IEC international standard division number (S);

2. Adopting an assembled structure, the parts have good disassembly performance and are easy to replace;

3. A practical and aesthetically pleasing special heat-resistant stainless steel sealing structure that can be used for a long time at 1300 ℃.

4、 Technical indicators:

1. Accuracy level: ± 0.25% t;

2. Temperature measurement range: 0 ℃~1300 ℃;

3. Division number: S；

4. Connection method: flange connection PN1.0; DN10；

5. Electrical interface: M16 × 1.5.

5、 Precautions for use and installation requirements:

1. When using thermocouple compensation wires, attention must be paid to model matching, polarity cannot be connected incorrectly, and the temperature at the connection end between the compensation wire and the thermocouple cannot exceed 100 ℃.

2. When using a thermocouple with a large time constant for temperature measurement or control, although the temperature displayed on the instrument fluctuates very little, the actual furnace temperature may fluctuate greatly. In order to accurately measure temperature, a thermocouple with a small time constant should be selected.

3. After correctly wiring and powering on according to the instrument wiring diagram, the instrument first displays the thermocouple index number of the instrument, then displays the instrument range, and then the digital tube in the lower row of the instrument displays the set temperature, and the digital tube in the upper row of the instrument displays the measured temperature.

4. Thermocouples cannot be installed in areas where the measured medium flows very little. When measuring the gas temperature inside a tube with a thermocouple, it must be installed against the flow velocity direction and fully in contact with the gas.

5. In order to ensure sufficient heat exchange between the measuring ends of thermocouples and thermal resistors and the measured medium, the position of the measuring point should be selected reasonably, and the valve should be avoided as much as possible

6. According to the law of intermediate conductor, in practical temperature measurement applications of thermocouples, the hot end is often welded and the cold end is open circuited. The cold end is connected to the display instrument through a connecting wire to form a temperature measurement system.

6、 Model specifications: