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Tungsten Rhenium Thermocouple

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Your professional Thermocouples & Rtds Manufacturer In China

Chongqing Duchin Instrument CO., LTD is a leading supplier in the manufacturing of thermocouples and rtd sensors in China.We've been dedicating to the temperature sensors industry for 29 years so far. And now, we possess more than 30 industry leading patents and products.

High Quality

With almost 29 years of industry experience, we are the experts in the field of manufacturing and calibration of temperature sensors,getting certificated by IS0 9001 Quality Management System and ISO 14001 Environmental Management System,with EX NEPSI,CE and SIL2 Certifications.

Professional Team

Duchin is working on process improvement, hiring the right employees and putting them through a series of training stages properly, and keying on communicating customer’s needs to ensure its goal of a 100% Quality Rating and Satisfaction is not missed out.

Cost Effective

Duchin not only has extensive product line and support to help our customers improve the quality of their products, but also with stable materials resources to ensure favorable prices with high quality.

Excellent service

Duchin wins trust and receives a great reputation from clients by offering high-quality products and superb 24-hour service. We also provide shock-proof packaging to ensure the product is in good condition.

 

 

productcate-2000-1000

 

What is a thermocouple?

A thermocouple, also known as a "thermoelectrical thermometer", is an electrical device consisting of two dissimilar electrical conductors forming an electrical junction. A thermocouple produces a temperature-dependent voltage as a result of the Seebeck effect, and this voltage can be interpreted to measure temperature. Thermocouples are widely used as temperature sensors.

 

What are features of Tungsten rhenium thermocouple?

 

 

Thermoelements

● C,D,A types.
● 0.5mm standard diameter.
● Temperature suggestion and accuracy please refer to Tungsten Rhenium Thermocouple Limits Of Error.

 

Specifications

● Connectors and junction box are commonly used to connect the wires.
● To combat highly pressurized vacuum environment, our clients can bringing up the needs to customize integrated anti-high-pressure device on the thermocouple.

 

Protection tube

● Our tube material selections are GH3039, GH3030, 99%Al2O3, Molybdenum, Tantalum, and Tungsten.
● Temperature suggestion please refers to Recommend Using Temperature And Environment Chart.

 

 

Tungsten rhenium thermocouple limits of error

 

Type

Thermoelement

Code

Limits Of Error(±℃)/Effective Temperature Range(℃)

1 class

2 class

3 class

Tungsten rhenium TC

Wre5-26

C

4.0 or 0.5%t/400~2315

1.0%t/426~2315

--

Wre3-25

D

4.0 or 0.5%t/400~2315

1.0%t/426~2315

--

Wre5-20

A

4.0 or 0.5%t/400~2500

1.0%t/1000~2500

--

 

Recommend Using Temperature And Environment Chart

 

Protection tube

Tube OD

Insulators

Max.Temp

℃

Application

GH3039

GH3030

Φ4,6,8

MgO

1300

Vacuum

Inert,Air

99% Al2O3

Φ8,12,16

99% Al2O3

1600

Vacuum,Inert

(Al2O3+Mo) Double Tubes

Φ16，25

99% Al2O3

1600

Air

Mo

Φ4,6,8

99% Al2O3

1600

Vacuum,Air

Mo

Φ4,6,8

BeO/HfO2

1800

Ta

Φ4,6,8

BeO

2000

W

Φ6,8

HfO2

2200

 

 

Application

Regular type. We can select protection tube materials and insulation materials based on the using temperature and gas environment.

productcate-1427-319
productcate-600-600
 

Commonly used type. Temperature transmitter can be added to the wire enclosure, the connection tube could increase the structural integrity. We can help you to make the best choice of protection tube and insulation materials for your plants accordingly.

 

The feature of High Pressure Vacuum Tungsten-rhenium Thermocouple should be more significant and obvious in high-pressurized situation. It can hold up to 10Mpa during our test, and we are using a method which is to seal it completely to manufacture the cold end.

productcate-750-750

 

 

Our Certificates

 

productcate-800-533
Business License
productcate-800-533
Certificate of High-tech Enterprise
productcate-800-533
Certificate of “SRDI”
productcate-800-533
Director of China Instruments Manufacturers Association
productcate-800-533
Member Of China Photovoltaic Industry Association (CPIA)
productcate-800-533
Recommend Supplier Of China Heat Treatment Association(CHTA)
productcate-800-1159
Certificate of National Torch Program Items
productcate-800-1159
Certificate Of Work Safety Standardization
productcate-800-1159
Intellectual Property Management System Certification

 

FAQ

 

Q: What thermocouple types called tungsten rhenium thermocouple?

A: There are C(Wre5/26), D(Wre3/25) and A(Wre5/20) types have been specified.

Q: What is positive wire of tungsten rhenium alloy type C thermocouple made up of?

A: Type C and Type D, thermocouple wire made from Tungsten Rhenium Alloy. Type C is Tungsten 5% Rhenium vs Tungsten 26% Rhenium. Type D has a slightly different composition: Tungsten 3 % Rhenium vs Tungsten 25% Rhenium.

Q: What is a Type C thermocouple?

A: What are Type C Thermocouples? Type C Thermocouples are made from Tungsten Rhenium alloys and designed for extreme high temperatures up to 4,200°F (2315°C). The thermocouple materials must be utilized in a hydrogen, inert, or vacuum atmospheres to prevent failure from oxidation.

Q: What is the difference between Type D and Type C thermocouple?

A: Type C is Tungsten 5% Rhenium vs Tungsten 26% Rhenium. Type D has a slightly different composition: Tungsten 3 % Rhenium vs Tungsten 25% Rhenium.

Q: Does tungsten oxidize at high temperature?

A: Yes, tungsten can oxidize when exposed to high temperatures during welding. Tungsten has a high melting point, making it an excellent choice for welding applications. However, at high temperatures, tungsten can react with atmospheric oxygen and form tungsten oxide (WO3) on its surface.

Q: Which thermocouple is best for high temperature?

A: Generally speaking, refractory metal tungsten-rhenium thermocouples Type C and Type D are considered the highest temperature thermocouples, capable of being used for temperature measurement up to 2300ºC, provided it is not an oxidizing environment.

Q: What is the maximum temperature of tungsten?

A: One of tungsten's unique properties is its very high melting point of 3,422°C (6,191.6°F). This is the highest melting point of any metal. Tungsten is the heaviest common, naturally occurring metal and has the ability to retain its strength at very high temperatures.

Q: What is tungsten rhenium?

A: W-Re alloys are made from Tungsten alloy with 3%, 5%, 25%, or 26% Rhenium, which becomes more ductile and machinable. With good electrical properties, W-Re alloys are widely used as high-temperature thermocouple materials.

Q: What is the output of a thermocouple?

A: Thermocouples produce outputs in the millivolt range. These signals can easily be affected by electro-magnetic interference from radios, high voltage devices and electric motors among others. In these cases, the thermocouple must be protected from the interference.

Q: Do thermocouples work in vacuum?

A: Formerly known as W5, Type C thermocouples (and all Tungesten/Rhenium alloy combinations in general) offer reasonably high and relatively linear EMF outputs for high temperature measurement. These types of thermocouples should be used in vacuum, inert atmospheres or dry hydrogen applications.

Q: Why thermocouple is good for high temperature?

A: They have a reasonably high and relatively linear EMF output and provide an excellent accuracy for extremely high temperature measurements up to 4170°F (2300°C).

Q: Why use thermocouple wire?

A: What is it Used For? Thermocouples are connected to wires that are used to measure the temperature of applications like diesel engines, exhausts, and other industrial processes where temperature monitoring is critical. The thermocouple wire is connected to a sensor used for determining temperature.

Q: Why do thermocouples fail?

A: There are any number of ways a thermocouple can fail. It can short out, the sheath can fail, it can be damaged during operation or installation, it can be improperly installed, etc. The key is to perform a thorough root-cause analysis and prevent the failure again in the future, if possible.

Q: Is a thermocouple analog or digital?

A: All temperature sensors are analog. Analog simply means a continuously variable output, with no discrete steps. Thermocouples develop a voltage across the cold junction that is proportional to temperature. RTD (Resistance Thermal Devices) vary resistance proportional to temperature.

Q: How is thermocouple connected to PLC?

A: There are two ways to connect thermocouples and RTDs to a PLC. The first method is connecting them to a transmitter that connects to a PLC and a log input module, or the second method, where some PLCs have a temperature sensor module, so sensors are connected directly to them.

Q: Can a thermocouple overheat?

A: There is such a thing as too much heat for a thermocouple. Whether you accidentally use a thermocouple that isn't meant to operate at your applications temperatures or your processed run hotter than they should, exposure to overheating can damage the elements in a thermocouple.

Q: What type of thermocouples are used?

A: Type C,D and A are “Tungsten rhenium’’thermocouples,with maximum operating temperature in vacuum and inert environment.

Q: Do thermocouples need calibration?

A: With constant use, the efficacy of the thermocouple deteriorates over time. So it is important that calibration should be made to ensure that the thermocouple works smoothly.

Q: Why is rhenium added to tungsten?

A: Due to its density higher than tungsten, rhenium does not lower the WHA material density, improves strength properties, and decreases the size of tungsten grains in the alloy microstructure.

Q: What are the factors influence using temperature of thermocouples?

A: The using temperature influence by the type of thermoelements,the protection tube and insulators material.

 

 

As one of the leading tungsten rhenium thermocouple manufacturers in China, we warmly welcome you to buy tungsten rhenium thermocouple made in China here from our factory. All customized products are with high quality and competitive price.