⎝⎛星力捕鱼⎞⎠

⎝⎛星力捕鱼⎞⎠ page Company Profile ⎝⎛星力捕鱼⎞⎠ Product center Quality system marketing network After sales service Recruitment contact us
Flow meter series
Temperature instrument series
Pressure instrument series
Calibration instrument series
Level instrument series
Digital display instrument series
Transmitter instrument series
Wire and cable series
Bridge instrument cabinet series
Pipe fitting valve series

Address: Xiongyi, Jinhe Road, Jinhu County, Jiangsu Province
Lunan
Phone: 0517-86900901
0517-86900921
0517-86900920
Fax: 0517-86900902
Postcode: 211600
http://zzyfwh.com
Email: chinadongxiang@163.com
technical article
Bimetal thermometer concept
2012-1-23 18:37:06

是一种测量中低温度的现场检测仪表。 Bimetal thermometer is a kind of on-site detection instrument for measuring low and medium temperature. It can directly measure the temperature of liquid vapor and gas medium in the range of -80 ℃-+ 500 ℃ in various production processes. Industrial bimetal thermometer

The main component is a multi-layer metal sheet composed of two or more metal sheets laminated together, which works on the principle that two different metals expand differently when the temperature changes. Is based on winding to make a looped bend

Composed of bimetallic pieces. When one end is heated and expanded, the pointer is rotated, and the working instrument displays the temperature value corresponding to the thermoelectric potential.

的安装,应注意有利于测温准确,安全可考及维修方便,而且不影响设备运行和生产操作.要满足以上要求,在选择对热电阻的安装部位和插入深度 For the installation of bimetal thermometers , attention should be paid to the accuracy of temperature measurement, safety, convenience and maintenance, and without affecting the operation and production operations of the equipment. To meet the above requirements, choose the installation location and insertion depth of the thermal resistor.

Pay attention to the following points:


1.In order to allow sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the location of the measurement point should be selected reasonably, and thermal resistance should not be installed near the dead corner of the valve, elbow and pipeline and equipment.


2.The thermal resistance with protective sleeve has heat transfer and heat loss. In order to reduce the measurement error, the thermocouple and thermal resistance should have sufficient depth of insertion.


(1) For the thermal resistance of the temperature of the fluid in the center of the pipeline, the measuring end should generally be inserted into the center of the pipeline (vertical installation or oblique installation). If the pipe diameter of the fluid to be measured is 200 mm, the depth of the thermal resistance insertion should be Choose 100 mm;


(2) For the temperature measurement of high-temperature, high-pressure, and high-speed fluids (such as the main steam temperature), in order to reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid, a shallow insertion of the protective tube or a thermal jacket Thermal resistance.

The depth of the shallow-inserted thermal resistance protective sleeve inserted into the main steam pipe should not be less than 75mm; the standard insertion depth of the thermal-sleeve thermal resistance is 100mm;


(3) If it is necessary to measure the temperature of the flue gas in the flue, although the diameter of the flue is 4m, the insertion depth of the thermal resistance can be 1m. Support frame and protective sleeve.


是利用两种不同金属在温度改变时膨胀程度不同的原理工作的。 Bimetal thermometers work on the principle that two different metals expand differently when the temperature changes. The main component of an industrial bimetal thermometer is a multilayer consisting of two or more metal sheets laminated together

Metal sheets. In order to improve the temperature measurement sensitivity, the metal sheet is usually made into a spiral shape. When the temperature of the multi-layer metal sheet changes, the amount of expansion or contraction of each layer of metal varies, so that the spiral coil is rolled up or loosened. Because one end of the spiral roll is fixed

The other end is connected to a pointer that can rotate freely. Therefore, when the bimetallic piece feels the temperature change, the pointer can indicate the temperature on a circular indexing scale. The temperature range of this instrument is 200 ~ 650 ℃, allowing

The error is about 1% of the two strokes of the scale. This thermometer is similar to a rod-shaped glass liquid thermometer in use, but can be used under conditions that require higher mechanical strength.


WSS series bimetal thermometer is a kind of on-site detection instrument suitable for measuring medium and low temperature. It can be used to directly measure the temperature of gas, liquid and steam.

Intuitive, easy to read, mercury-free, rugged and durable. It can replace other geotechnical temperature measuring instruments and is widely used in petroleum and chemical industry, machinery, shipbuilding, power generation, textile, printing and dyeing industries and scientific research departments.


Features


Mercury-free, easy to read, rugged and shock-resistant.


The protective tube is 1Gr18Ni9Ti stainless steel and titanium molybdenum, which has strong pressure and corrosion resistance.

Pull-type thermometer can be maintained or replaced for a short time without stopping the machine.

Axial type, radial type, 135o type, universal type and other varieties are complete, suitable for various site installation needs.