1. When using the thermocouple compensation wire, you must pay attention to the matching of the model, the polarity can not be wrong, and the temperature of the compensation wire and the thermocouple connection end can not exceed 100 ℃. 2. When a thermocouple with a large time constant is used for temperature measurement or temperature control, although the temperature displayed by the instrument fluctuates very little, the actual furnace temperature may fluctuate greatly. In order to accurately measure the temperature, a thermocouple with a small time constant should be selected. 3. Perform correct wiring according to the meter wiring diagram. After powering on, the meter will first display the thermocouple index number of the meter, then display the meter range, then measure the lower row of the meter to display the set temperature, and the upper row of the meter to display the measured temperature. . 4. The thermocouple cannot be installed in an area where the measured medium seldom flows. When using a thermocouple to measure the gas temperature in the tube, the thermocouple must be installed against the direction of flow velocity and fully in contact with the gas. 5. In order to have sufficient heat exchange between the measuring end of the thermocouple and thermal resistance and the measured medium, the measuring point position should be selected reasonably. 6. According to the law of intermediate conductors, in the actual temperature measurement application of thermocouples, hot-end welding and cold-end open-circuit are often used, and the cold-end is connected to the display instrument via a connecting wire to form a temperature measurement system. Armored thermocouples are widely used in industries such as industry, medical treatment, petroleum, metallurgy, and construction. Thermocouples are mainly measurement tools. If the measurement of thermocouples is inaccurate, the accuracy is not high, and the leakage of WRNK-101 armored platinum rhodium thermocouples, etc., it will have a great impact on users. So why does the thermocouple leak? Today, I will introduce the reasons for the leakage of the WRNK-101 armored platinum rhodium thermocouple. Reasons for leakage of armored thermocouples (1) The refractory bricks on the electric furnace have poor insulation at high temperatures. Inserting a thermocouple with a metal tube into the furnace wall with the furnace wire can easily make the furnace wire contact with the thermocouple. The refractory brick is at room temperature. It is a good insulation material removal. Alumina refractory bricks are mostly used for the lining of resistance electric furnaces, and the resistance value decreases significantly as the temperature rises. (2) The contact between the furnace wire and the thermocouple. The platinum-rhodium thermocouple protection tube is an alumina porcelain tube. The couple wire is worn with a porcelain tube for separation and insulation. The insulation performance will also be reduced at high temperatures, resulting in leakage and later leakage. At the thermocouple, there is an AC leakage signal on the thermocouple. The solution to the leakage of the armored thermocouple (1) Keep the thermocouple not in contact with the refractory brick. (2) Ground the negative pole of the thermocouple to eliminate the leakage signal on the thermocouple. (3) Install a filter device at the output end of the thermocouple. (4) Lead the ground wire from the hot junction of the thermocouple to ground. With the rapid development of chemical, petroleum, metallurgy, machinery and other sectors, high-precision and high-sensitivity meters are widely used, and the anti-interference problem of liquid level gauges has become a problem that must not be ignored, especially industrial electric furnaces, silicon carbon rod electric furnaces, The interference produced by the salt bath furnace is large, causing the instrument to work abnormally, increasing the error, instability, and slowing down the indicating speed. It must be resolved, otherwise the product quality cannot be guaranteed and losses will be caused.
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