2015年1月21日星期三

Three Installation Suggestions Of The Thermal Resistance

Thermal resistance is a kind of temperature detector most commonly used in low temperature area. And for its installation, there are three suggestions about the installation place, connection and deviation.

First, we talk about installation place. Thermal resistance should be avoided to install besides the stove or the place too close to the heating body. And it should be installed in the place where there is no shock or just small vibration. At the same time, the place should ensure that the construction and maintenance is convenient. The installation position should as far as possible to maintain the vertical, but if there is a velocity flow, it has to be inclined installation. And the junction box hole should be downward.

Then, for the connection, thermal resistance should be in accordance with the provisions of the wiring. Generally, it uses the three-line system. The connecting wire should be insulation copper, whose cross-sectional area should be greater than or equal to a square millimeter, and its conductor resistance value should be in accordance with the provisions of the display instrument.

Last, we should know that thermal inertia can make the change of heat resistance lag behind that of temperature. In order to eliminate the error caused by it, we should reduce the protection tube of heat resistance as far as possible to, while appropriately increasing the insertion depth of the thermal resistance to increase its heated parts. In addition, we should also pay attention to regularly check the protection status of the thermal resistance.


2015年1月4日星期日

Know Something About The Sheathed Thermal Resistance

Sheathed thermal resistance is a kind of temperature sensor, measuring the temperature by the character of the material that if the material changes its temperature, so does the resistance of it. When the resistance changes, the working instrument will display the corresponding resistance temperature value. The diameter of it is smaller than that of the assembly type platinum resistance and it is easily bending, which determines that it is suitable for mounting in the narrow and special occasions, such as miniaturization that requires quick response.

Sheathed thermal resistance can automatically detects the temperature of the gas liquid medium and solid surface range of -200~600 DEG C, and can be directly used to connect with the copper conductors and secondary meter. And since it has the good output characteristics of power, it can provide accurate input values for display instrument, recorder, regulator, scanner, data recorder, computer and so on. For another thing, sheathed thermal resistance adopts the protective cover made of stainless steel and be filled with high-density oxide insulator material, therefore, the sheathed thermal resistance has strong anti pollution performance and mechanical strength, which also makes it suitable for installation in the harsh environment applications.