Something About The Assembly Thermal Resistance

The thermal resistance measures temperature by using the material characteristics that when temperature of the material changes, the resistance of it also changes. And as the resistance changes, the working instrument will display temperature value which is corresponding to resistance. The industrial thermal resistance, as the assembly temperature measurement sensor, usually works with the display instruments, recorder and electronic regulator. And it can It can directly measure or control the surface temperature ranging from -200℃ to 600℃ of various liquid, steam and gas medium, and solids in the production process.

There are many advantages of thermal resistor assembly. It has good anti vibration performance, high mechanical strength and good pressure resistance, and it can work with high accuracy as well as reliable and stable performance. When selecting the assembly thermal resistance, there are several aspects you should pay attention to, such as the model, indexing, precision grade, installed and fixed form, protection of pipe material and the length or depth of insertion problem etc..

Know Something About Integrated Temperature Transmitter

First, integrated temperature transmitter can realize functions of managing the range of remote information management, configuration, variable monitoring, calibration and maintenance through HART communication device.

Second, integrated temperature transmitter can be adjusted according to the user's actual needs according to direction of the transducer, and display the measured medium temperature transmitter, the sensor values change, the output current and percentage rate.

Third, integrated temperature transmitter uses silicone rubber and epoxy resin sealing structure, so it has the advantages of resistance to shock , moisture resistance, and is suitable for installation at the scene of the harsh environment.

Forth, installed in the terminal box use of thermocouple, heat resistance, it can directly output 4-20 ma, 0 to 10 ma of the signal, which can not only save the expensive cost of compensation conductor, but also improve the anti-interference ability in the process of signal transmission over a long distance.

Fifth, thermocouple transmitter has cold end temperature automatic compensation function;

Sixth,  integrated temperature transmitter has the advantages such as the high precision, low power consumption, the use of wide temperature range, stability and reliability on working and so on.

Seventh, wide applicable scope. Integrated temperature transmitter can form integrated installation structure with thermocouple, heat resistance, and can also be used as a functional modules installed on the testing equipment and instrument panel.

Four Things About The Integrated Temperature Transmitter

Integrated temperature transmitter has the advantages of smaller volume, but widely use. And here are some things you should pay attention when using it.


First, for the wiring, the safety spark circuit (the input signal line), must be with an insulating sleeve wire or a shield, and non safety spark circuit wiring should be isolated from the safety spark circuit to avoid mixed contact.


Second, wire different types of integrated temperature transmitter according to the specification. And there should be nothing wrong with explosion-proof instrument which has the safety spark circuit. You should carefully check whether there is a short circuit or any other wrong wiring.


Three, in the use of the integrated temperature transmitter, special attention should be paid to the distinction of common type and intrinsic safe type. Ordinary type cannot be installed in hazardous area, while the intrinsic safe type can be done that.

Four, RTD transmitter input is in the three-wire system. Resistance of each connecting wire line should be equal and in the same environment temperature range.

The Working Principle Of Thermocouple

When two kinds of material with different components compose a conductor loop, there is a temperature gradient, and will be current through the loop. At this time, there will be the electromotive force between the two ends and this is called the Seebeck effect (Seebeck effect), which is the working principle of thermocouple. These two different homogeneous conductors work as the thermodes, and the end with higher temperature is a working end, while the other one with the lower temperature is a free end, the free end usually at a constant temperature. According to the function relationship between temperature and the electromotive force, we can make the thermocouple indexing table; indexing table is obtained under the conditions that the temperature of free end is at zero degree Celsius below, different thermocouples with different indexing table.

When the thermocouple loop is connected with the third metal material, as long as the two contact of the material are in the same temperature, the electromotive force generated by the thermocouple will remain unchanged, which is not affected by the third kinds of metallic access in the loop. Therefore, while the thermocouple is measuring the temperature, we can access measurement instruments, and once the electromotive force is measured, we can know the temperature of the measured medium.

The Technical Advantages Of Thermocouple

Thermocouples are commonly used in the temperature measuring instrument. Due to the different use, appearance of thermocouples is not very identical, but their basic structure is roughly the same, and also has the following technical advantages.

First of all, the thermocouple assembly is simple, and replacement is convenient. Second, the range of temperature measurement of thermocouples is wide; they can achieve the continuous measurement of the temperature between -40~+ 1600, and in some special circumstances, the temperature that can be measured could be －270℃～2800℃. Third, thermocouples can work with high precision. Because the thermocouples and the measured object are not in direct contact, so the result is not affected by the medium, thus ensuring the accurate measurement results. Meanwhile, the thermal response time of thermocouple is very short, and they can timely measure the changes of the temperature. Fifth, performance of the thermocouples is firm, and they also have good mechanical strength, so the using life of them is usually very long.

Installation Of Thermocouple

In production, due to the different measured object, conditions, and measurement requirements, the installation methods of thermocouple are also different. Besides much consideration, there are three main aspects of thermocouple installation:  temperature measuring accuracy, safety, and convenient repair.


In order to avoid the temperature measuring element is damaged, you should ensure that it has sufficient mechanical strength. For the protection of the temperature sensing element, there should be protected screen or protection tube, then, the installation method of the temperature measuring element should depend on the specific circumstances. You should ensure the sealing of thermocouple. Working under high temperature thermocouple should be installed vertically, in order to prevent the deformation at high temperature. If it must be installed horizontally, the length of it should not be too long. Furthermore, there should be the protection of thermocouples. If the temperature measuring element is mounted in the pipeline with high flow velocity, it should be obliquely installed in the pipeline bend. When the medium pressure exceeds 10MPa, there must be protection coat on the measuring element. Moreover, when install the thermocouple, you should also consider whether it is convenient to change and repair.