WZPK-240Armored explosion-proof thermistor is mainly used to measure the temperature of liquid, steam, gas media and solid surfaces within the range of 0-500 ℃ in the presence of hydrocarbon explosions in production sites. It is usually used in conjunction with display instruments, recording instruments, etc.1、 Working principle:
WZPK-240Armored explosion-proof thermistor utilizes the principle of gap explosion-proof to design junction boxes and other components with sufficient strength. All components that can generate sparks, arcs, and dangerous temperatures are sealed inside the junction box cavity. When an explosion occurs inside the cavity, it can be extinguished and cooled through the gap between the joint surfaces, preventing the flame and temperature after the explosion from being transmitted outside the cavity, thus achieving explosion-proof.
2、 Structural features:
1. The large cavity junction box and innovative wiring device make wiring more convenient and reliable.
2. The overall protective tube for deep blind hole processing has uniform wall thickness at the end, no welding stress and potential risks of intergranular corrosion. Therefore, it is pressure resistant, impact resistant, reliable in use, has a long service life, and can ensure the safe operation of the unit.
3. Hot sleeve thermistor, all equipped with armored components, resistant to shock and pressure, high stability, and long service life.
4. The 650 ℃ high-temperature armored platinum resistance element with overall stretching can meet the high-precision and highly reliable main steam temperature requirements of large units in terms of shock resistance and temperature measurement upper limit.
3、 Installation requirements:
1. In order toWZPK-240There is sufficient heat exchange between the measuring end of the armored explosion-proof thermistor and the measured medium. The location of the measuring point should be selected reasonably, and the installation of the thermistor near the dead corners of valves, elbows, pipelines, and equipment should be avoided as much as possible
2. Thermistors with protective sleeves suffer from heat transfer and dissipation losses. To reduce measurement errors, thermocouples and thermistors should have sufficient insertion depth.