What are the common temperature measuring elements? What are the commonly used temperature measuring

Commonly used temperature measurement components in industry are: thermocouples, thermal resistance, bimetals; Among them, thermocouples and RTDs belong to the contact temperature measurement in temperature measurement, although their functions are the same to measure the temperature of the object, but their principles and characteristics are different.

Thermocouple is the most widely used temperature device in temperature measurement, its main characteristics are wide measurement range, stable performance, simple structure, good dynamic response, and can transmit 4-20mA electrical signal remotely, which is convenient for automatic control and centralized control.

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Commonly used temperature measuring elements are:

1. Copper RTD.

2. Platinum thermal resistance.

3. Nickel-chromium-copper-nickel thermocouples.

4. Nickel-chromium-nickel-silicon thermocouple.

5. Platinum rhodium-10-platinum thermocouple.

6, platinum rhodium-30-platinum rhodium-6 thermocouple.

7. Bimetal thermometer.

8. Glass thermometer.

9. Semiconductor thermistor thermometer.

Usually, bearings and bearings are measured with end-face platinum thermal resistance, stainless steel probes, screwed fixed, leading out platinum resistance signals, and externally connected to the control room or display instrument; The stator and winding temperature measurement are embedded platinum thermal resistance, which is long plate-shaped, embedded in the winding, and leads to the platinum resistance temperature signal.

Usually, the bearing temperature measurement also uses a pressure thermometer or a bimetal thermometer, which is displayed with a pointer on the spot. Nowadays, this kind of thermometer is mostly a composite type, and the field pointer shows that it has a remote PT100 signal or a 4-20mA signal at the same time, and a temperature meter solves it, such as WTZ-285.

<> generally, Shiheng produces the shape of the water droplets scattered in the above figure, which has a small size and light weight. Fast thermal induction and high sensitivity. The structure is stable and reliable.

It has the advantages of high resistance accuracy and good consistency. And it can be used not only in electronic thermometers, but also in some other medical devices. You can learn more about it.

Infrared temperature measuring element, this is sold on the Internet, about 6 yuan.

Commonly used are: multimeter, meter (trillion parsley meter, the meter used for different voltage levels is not the same, such as the secondary circuit is measured with a 500V meter), electric detector (equipped according to the voltage level of the station), clamp ammeter, point thermometer (used to measure suspicion refers to virtual temperature), phase sequence table.

1. Spare parts for power plants, including primary and secondary components, 2

Commonly used from low voltage (380V.

Thermocouples and RTDs should avoid violent collisions and bumps when storing, transporting, carrying, installing and using.

Thermocouples and RTDs should be placed in the measurement temperature field to avoid sudden cooling and heating.

When using, the specified insertion depth should be reached, otherwise the accuracy of the measurement cannot be guaranteed.

It should be used according to the environment and atmosphere specified by thermocouples and RTDs, otherwise it will seriously affect the service life and accuracy.

The upper limit of the temperature of the measured temperature field should be close to two-thirds of the upper limit of the measurement range, if it is operated at the upper limit of the measurement range for a long time, its life may be affected.

When installed at the level of high temperature environment, the high temperature strength of the protection pipe and the deformation under high temperature conditions should be fully considered.

The influence of thermocouples and RTD leads on the measurement accuracy should be fully considered. The connection wires from thermocouples and RTDs to the indicator or transmitter should be as short as possible and shielded wires should be used; When using, it should be routed separately from the power cable, otherwise it will cause interference and affect the stability of the display.

Usually, bearings and bearings are measured with end-face platinum thermal resistance, stainless steel probes, screwed fixed, leading out platinum resistance signals, and externally connected to the control room or display instrument; The stator and winding temperature measurement are embedded platinum thermal resistance, which is long plate-shaped, embedded in the winding, and leads to the platinum resistance temperature signal.

Usually, the bearing temperature measurement is also envied by a pressure type Wen Lu Zheng Du Zao Song meter or a bimetal thermometer, which is displayed with a pointer on the spot. Nowadays, this kind of thermometer is mostly a composite type, and the field pointer shows that it has a remote PT100 signal or a 4-20mA signal at the same time, and a temperature meter solves it, such as WTZ-285.