Stainless Steel Armoured Thermocouple

Thermocouple is a common temperature measuring element in the temperature measuring instrument. It directly measures the temperature, and converts the temperature signal into thermoelectric electromotive force signal, which is converted into the temperature of the measured medium by the electric instrument (secondary instrument).
1. Simple assembly and convenient replacement; 2, pressure spring type temperature sensing element, good seismic performance; 3, high measurement accuracy; 4, the measurement range is large (-200ºC ~ 1300ºC, under special circumstances -270ºC ~ 2800ºC); 5. Fast thermal response time; 6, high mechanical strength, good pressure resistance; 7, high temperature resistance up to 2800 degrees; 8, long service life.
Working principle of platinum-rhodium thermocouple: platinum-rhodium thermocouple is composed of two conductor ends of different components of the synthesis loop, when the two junction temperature is not at the same time, will produce thermal current in the loop. If there is a temperature difference between the thermocouple working end and the reference end, the display meter will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.
Wear-resistant thermocouple model and specification:

Notes and installation requirements for platinum-rhodium S-type thermocouple in field use:
Platinum-rhodium S-type thermocouple installation methods are mainly threaded connection, flange connection and welding, its application occasions and requirements are different, mainly according to pressure, temperature and other parameters. First, platinum-rhodium S-type thermocouple can not be installed in the measured medium rarely flow in the region, when using platinum-rhodium thermocouple to measure the temperature of the gas in the tube, the platinum-rhodium thermocouple must be installed against the direction of the flow rate, and full contact with the gas. Second, in the use of platinum-rhodium S-type thermocouple compensation wire must pay attention to model matching, polarity can not be connected wrong, compensation wire and platinum-rhodium thermocouple connection end temperature can not exceed 100ºC. Third, according to the middle conductor law, in the practical application of platinum-rhodium S-type thermocouple temperature measurement, often using hot end welding, cold end open form, cold end by connecting wire and display instrument connected to form a temperature measurement system. Fourth, according to the instrument wiring diagram for the correct wiring and power, the instrument first shows the instrument platinum-rhodium S-type thermocouple indexing number, then shows the range of the instrument, and then measure the instrument lower row of digital tube display set temperature, the instrument upper row digital tube display temperature measurement. Fifth, when using the time constant large platinum-rhodium S-type thermocouple temperature measurement or temperature control, although the instrument temperature fluctuation is very small, but the actual temperature fluctuation may be very large. In order to accurately measure temperature, platinum-rhodium thermocouple with small time constant should be selected. Sixth, in order to make the platinum-rhodium S-type thermocouple and thermal resistance of the measuring end and the measured medium between the full heat exchange, should be reasonable choice of measuring point location, as far as possible to avoid in the valve.
Platinum-rhodium thermocouple temperature measurement range: platinum-rhodium thermocouple can be used in vacuum, oxidation, reduction and inert atmosphere, but the positive iron in high temperature oxidation faster, so the use of temperature is limited, also can not be directly unprotected in high temperature for vulcanization atmosphere.
1, platinum rhodium - platinum thermocouple temperature range of 630.74~1064.43ºC
2, ni-Cr - Ni-si thermocouple temperature range of 0~900ºC
3, tungsten-rhenium thermocouple temperature range of 300~2000ºC
4, ni-Cr-Constantan thermocouple temperature range 0~600ºC
5, copper - Constantan thermocouple temperature range -200~100ºC
Platinum-rhodium thermocouple selection: according to the temperature measurement range and accuracy, select the corresponding thermocouple. When the temperature is 1300~1800ºC and the accuracy is relatively high, type B thermocouple is generally used; The accuracy is not high, and the atmosphere allows the use of tungsten-rhenium thermocouple, higher than 1800ºC generally choose tungsten-rhenium thermocouple; The use of temperature in 1000~1300ºC requires high accuracy and high availability of S-type thermocouple and N-type thermocouple; In 1000ºC below the general use and N type thermocouple, below 400ºC with E type thermocouple; At 250ºC and negative temperature measurement generally use T thermocouple, T thermocouple stability and high precision at low temperature.
Wrek-101 Armoured thermocouple Armored thermocouple has the characteristics of bending, high temperature resistance, fast thermal response time and strong and durable, it and industrial assembly thermocouple, as a temperature sensor, usually used with display instrument, recording instrument and electronic regulator, at the same time, can also be used as assembly thermocouple temperature sensing element. It can directly measure the temperature of liquid, steam and gas medium and solid surface from 0ºC to 800ºC in various production processes, and should conform to GB/T18404-2001 standard.
Armoured thermocouple working principle: it is composed of two different components of conductor by welding at both ends, forming a loop, direct temperature measurement end called measuring end, wiring end called reference end. When there is a temperature difference between the measuring end and the reference end, thermal current will be generated in the loop, connected to the display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric electromotive force generated by the thermocouple.
The thermoelectric emf of the WREK-101 armored thermocouple will increase as the temperature of the measuring end increases. The size of the thermoelectric EMF depends only on the material of the armored thermocouple conductor and the temperature difference between the two ends, not the length or diameter of the thermal electrode.
The WREK-101 armored thermocouple consists of a conductor, an insulated magnesium oxide, and a 1Cr18Ni9Ti stainless steel protective tube that has been repeatedly drawn. The basic structure of the wreK-101 armored thermocouple consists of a junction box, terminal blocks, and an armored thermocouple with various mounting and mounting devices.
Armored thermocouple is divided into two types: insulation type and shell type.
Wear-resistant thermocouple with vibration resistance, wear resistance, corrosion resistance, high sensitivity, good stability, high accuracy, long service life and other advantages, power plants, cement plants, chemical smelters and other high-temperature wear-resistant areas of the preferred temperature measurement protection tube.
Sc-wrn series wear resistant thermocouple main features:
1. Wear-resistant material process: wear-resistant material is in the metal surface of the alloy base metal (for example: 601 stainless steel) and tungsten carbon compound at the same time melting, vaporization by high voltage electrical pulse generated local ultra-high temperature; They then quickly fuse the two together and cool the whole process in an instant. Ensure new alloy produced by strong hardness (C76), alloy layer thickness can be up to 0.12 "(3 mm) process, different from the metal coating as a kind of metal attached to the base material, but in regenerating a new alloy substrate metal surface, the metal layer and the internal essence of base material is a whole, therefore, wear-resisting performance is greatly increased.
2. The treated tungsten carbon alloy has a surface hardness of HRC76 (about Vickers 1750, ceramic grade) 10 times that of ordinary stainless steel.
3. The surface alloy layer and the base material stainless steel to form a whole, so the thermal expansion coefficient and brittleness are exactly the same, will not crack at high temperature.
4. Good high temperature resistance, wear-resistant alloy layer can withstand temperature up to 1800ºC, long-term normal use at 1200ºC temperature.
5. Because it is tungsten carbon compound, the oxidation resistance is twice that of 316 stainless steel.
6. Long service life, in the use of CFB boiler bed temperature shelf life of 12 months.

Wear-resistant thermocouple main technical parameters:

Insulation resistance > 100M ω (at room temperature)

Wear-resistant head hardness: HRC62-65

Test voltage: 500VDC

Electrical outlet: M20× 1.5NPT1/2

Connection size: M27×2 NPT3/4

Protection level: IP65

Accuracy grade: Grade

Flange standard: American standard ASME/ANSIB116.5-88 German standard DIN 2628-2638-1975
Wuxi Yuan sheng  new energy equipment co., LTD. Now with liquid level transmitter, thermocouple, heat resistance, bimetallic thermometer, flow meter, pressure gauges, pressure transmitter, regulating valve, gate valve, globe valve, ball valve, pipe valves for the leading product, taking market demand as the guidance, to continuous innovation, research and production of new automation instrument as own duty, The company has completed efficient industrial chain integration of product design, raw material procurement, production and processing, logistics and transportation, order processing, wholesale operation and terminal retail.