The difference between armored thermal resistance and standard platinum resistance is

What is the difference between the appearance of armoured thermal resistance and standard platinum resistance at two temperatures

Although armored thermal resistance is widely used in industry, its application is limited by its temperature measurement scale. The temperature measurement principle of thermal resistance is based on the characteristics of conductor or semiconductor resistance with the change of temperature. Its advantages are many, but also can transmit electrical signals, high activity, strong stability, interchangeability and accuracy are better, but the demand for power excitation, can not be instantaneous measurement of temperature change. Industrial thermal resistance generally uses Pt100, Pt10, Cu50, Cu100, platinum thermal resistance temperature measurement scale is generally minus 200-800℃, copper thermal resistance is minus 40 to 140℃. Thermistors are the same type as thermocouples, but require no compensating wires and are cheaper than thermocouples.

Standard platinum resistance thermometers have been widely used in China. In particular, quartz outer sheath second-class standard platinum resistance thermometers are widely used in all levels of temperature measurement laboratory value transfer and precision temperature measurement. Standard platinum resistance thermometers have two types of outer protection tube, quartz outer protection tube and metal outer protection tube. Platinum resistance thermometers and metal resistance thermometers have their own advantages and disadvantages. The detailed choice of thermometer depends on the actual situation of the user. Generally speaking, quartz external protecting tube standard platinum resistance thermometer can achieve safe sex is superior to the protection pipe outside the metal standard platinum resistance thermometer, therefore, so far, quartz external protecting tube standard platinum resistance thermometer can is standard, the first or second grade, and the level of protection pipe standard platinum resistance thermometer outside the metal is usually are second-class. However, the advantage of the metal sheath standard platinum resistance thermometer is that it is not easy to damage, and can be used in many non-acidic media, metal blocks or harsh environments. This is important because standard platinum resistance thermometers are usually irreparable when damaged.

Ordinary thermal resistance

From the temperature measurement principle of thermal resistance, it can be known that the change of measured temperature is directly measured by the change of resistance value of thermal resistance. Therefore, the change of lead resistance of thermal resistance body and other wires will affect the temperature measurement.

Armored thermal resistance is composed of temperature sensing element (resistance body), lead, insulation material, stainless steel bushing combination of solid body, its outer diameter is generally φ2-φ8mm, small up to φ0.25mm. Compared with ordinary thermal resistance, it has the following advantages:

(1) Small volume, no air gap inside, thermal inertia, small after measuring value;

(2) Good mechanical properties, vibration resistance, impact resistance;

(3) can be bent, easy to install;

④ Long service life.

Armored thermal resistance is a common temperature measuring element in the surface of temperature measurement. It is composed of two conductors with different components connected at both ends of the synthetic loop. When the temperature of the thermocouple at the two junction is different, thermal current will occur in the loop. If there is a temperature difference between the operating and reference ends of the thermocouple, the display surface will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.

Armored thermal resistor is a kind of temperature sensor, it is smaller than the diameter of a prefabricated thermocouple, flexible, good shock resistance, is suitable for the occasion, device in prefabricated thermocouple cannot device company produced armoured thermocouple introducing thermal resistance temperature measurement component, therefore, is accurate and adjustable, heat fast response time, stable quality, long life and other advantages.