End face thermal resistance
The end face thermal resistanceWZPM2-201 is A Temperature Sensor used to measure the surface temperature of motor components. It achieves rapid and accurate measurement of the surface temperature by fixing the component on the end face of the protective tube and making close contact with the surface to be measured under the action of the compression spring.
1.Composition of the end face thermal resistance system:
A thermal resistance temperature measurement system is generally composed of thermal resistors, connecting wires and display instruments, etc. The following two points must be noted:
The graduation numbers of the thermal resistor and the display instrument must be consistent
To eliminate the influence of resistance changes in the connecting wires, a three-wire connection method must be adopted
Compared with the common type of thermal resistance, it has the following advantages:
①It is small in size, with no air gap inside. In terms of thermal inertia, the measurement lag is small
② It has good mechanical properties, is vibration-resistant and shock-resistant
③ It can be bent and is easy to install
④ Long service life
2.Installation requirements for end face thermal resistors
For the installation of thermal resistors, attention should be paid to ensuring accurate temperature measurement, safety and reliability, ease of maintenance, and not affecting the operation of equipment and production operations. To meet the above requirements, the following points should be noted when choosing the installation position and insertion depth of the thermal resistor:
(1)To ensure sufficient heat exchange between the measuring end of the thermal resistor and the medium being measured, the measurement point position should be reasonably selected. It is advisable to avoid installing thermal resistors near valves, elbows, dead corners of pipelines and equipment as much as possible.
(2)Thermal resistors with protective sleeves have heat transfer and heat dissipation losses. To reduce measurement errors, the thermocouple and thermal resistor should have sufficient insertion depth:
If the pipe diameter of the fluid to be measured is 200 millimeters, the insertion depth of the thermal resistor should be selected as 100 millimeters.
To reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid, the shallow insertion method of the protective tube or the use of a thermal sleeve type thermal resistor can be adopted. The shallow-insertion type thermal resistance protective sleeve should be inserted into the main steam pipeline to a depth of no less than 75mm. The standard insertion depth of the thermal sleeve type thermal resistor is 100mm.
If the temperature of the flue gas in the flue needs to be measured, even though the flue diameter is 4 meters, the insertion depth of the thermal resistor is only 1 meter.
When the insertion depth of the measuring element exceeds 1m, it should be installed as vertically as possible, or a support frame and protective sleeve should be added.
Compared with the general axial thermal resistance, the end face thermal resistance WZPM2-201 has the following advantages:
Rapid response: As the component is in direct contact with the surface under test, it can respond more quickly to temperature changes on the surface under test.
Accurate measurement: By cooperating with the compression spring, it can ensure that the component is in close contact with the measured surface, reducing measurement errors.
Strong adaptability: It can be used to measure the surface temperature of motor parts of various shapes and sizes, and has strong adaptability.
The end face thermal resistance WZPM2-201 is mainly applied to the surface temperature measurement of motor components, such as motor casings and motor windings. It can be used in various industrial environments and has high reliability and stability.