Matters needing attention in the use of armored thermal resistors

When wiring the armored thermal resistor, first open the junction box and then connect the wires. There are generally two wiring methods: two-wire and three-wire. The advantage of the three-wire connection is that it can prevent the indication error of the display instrument caused by the resistance value of the connecting wire of the bimetallic thermometer.
The connecting wire between the armored thermal resistor and the display instrument should be insulated copper wire, and the compensation wire of the thermocouple shall not be used. The resistance value of the copper wire should be selected according to the data specified in the technical conditions of the display instrument, generally 2-50, and the resistance value of the wire can be adjusted by a DC balancing bridge. An armored thermal resistor cannot be used in parallel with two display instruments. Only a double-branch thermal resistor can be used with two display instruments.
When not in use, the armored thermal resistor and its accessories must be kept in a place where the tungsten-rhenium thermocouple is not subject to vibration and collision. The most suitable storage conditions are: ambient temperature 10-35gc; relative humidity not more than 80%; the surrounding air should not contain substances that may cause corrosion of thermal resistor parts.
Armored thermal resistors measure temperature by using the characteristic that the resistance of a material changes as the temperature changes. When the resistance value changes, the working instrument displays the temperature value corresponding to the resistance value. Armored thermal resistors are a type of temperature sensor. They are smaller in diameter than assembled thermal resistors, easier to bend, and have good shock resistance. They are suitable for installation in places where assembled thermal resistors cannot be installed. The WZPK series armored thermal resistors use imported thermal resistor temperature measuring elements. Therefore, they have the advantages of accuracy, sensitivity, fast thermal response time, stable quality, and long service life.
The outer protective sheath of the armored thermal resistor is made of stainless steel and filled with high-density oxide insulators. Therefore, the armored thermal resistor has strong anti-pollution performance and mechanical strength, and is suitable for installation in harsh environments.
Features
The outer protective tube of the armored resistor is made of stainless steel and filled with high-density metallurgical grade magnesia oxide insulators. Therefore, it has strong anti-pollution and excellent mechanical strength, and is suitable for installation in harsh environments. High measurement accuracy;
Imported or domestically produced thin film resistor elements, reliable and stable performance;
Armored thermal resistors are usually composed of armored platinum thermal resistor temperature sensing elements, mounting fixtures and wiring devices and other main components. The thermal response time is short, reducing dynamic errors; small diameter and limited length;
The maximum operating temperature and working pressure of the thermal resistor cannot exceed the rated value of the thermal resistor. If the thermal resistor needs to be used in corrosive media, a protective tube made of stainless steel should be used. The sensitive element length of most thermal resistors is about 120mm. When selecting the insertion depth of the thermal resistor, it should be considered that the thermal resistor can only measure the uniformity of the measured medium in the vicinity of the sensitive element.
During use, the appropriate thermal resistor model, specification and protective tube should be selected according to the measurement temperature range and measurement object of the armored thermal resistor.