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Your Professional Thermocouple Sheath Supplier

 

Shanghai Xida is a professional manufacturer specializing in surface heaters, air heaters, molded heaters, semiconductor thermal elements, heater assemblies, and infrared panel emitters. As a leading enterprise, we excel in the research, development, and manufacturing of semiconductor gas equipment and associated auxiliary devices.
 

Professional Team
Our company boasts a team of experts with specialized industry knowledge, equipped with advanced design software and supported by a first-class engineering team.

 

Excellent Service
To better serve our international clientele, we have established an R&D center in Taiwan and a regional office in Singapore.

 

Advanced Equipment
We are equipped with six state-of-the-art imported automatic welding machines and a 540-square-meter electrical assembly and testing workshop.

 

One-stop Solution
XIDA provides comprehensive solutions for heat tracing, field services, heating systems, temporary power, engineered designs, and overall process flow management.

 
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Specifications of Thermocouple Sheath

 

Heater Surface Temperature

150℃ in standard usage.

(Depending on operating environments, operating tempertures may vary)

Voltage

~ 200V

Watt Densities

① Max: 1.0W/cm2 when suspended in still air

② Max: 1.5W/cm2 when fitted closely to workpiece

Insulation Resistance

100MΩ or more at 500V DC

Thickness

0.2mm or less (except for lead wire joint)

Heater Size Limitations

W20 ✕ H20mm ~ W300 ✕ H300mm

Product Code

PI-

 

Types of Thermocouple Sheath

 

The thermocouple sheathes produced by our company mainly include the following types

K Type Thermocouple Ceramic Sheath

K Type Thermocouple Ceramic Sheath

The k type thermocouple ceramic sheath is a sensor used to measure temperature in a range of different processes and consists of two wire legs made of different metals that are connected together at both ends to form two junctions. The hot junction or measuring junction is connected to the object whose temperature is to be measured.

Metal Sheathed Thermocouple

Sheathed Thermocouple

The cable is PFA insulated to resist most oils, acids and liquids. The thermocouple features a single element insulated hot junction to reduce electrical interference and an M8 x 1.00mm fine thread pot seal rated to 200°C.

Metal Sheathed Thermocouple

Metal Sheathed Thermocouple

Metal sheathed thermocouple has the highest accuracy and the lowest price among base metals. Sheathed thermocouple uses shielded thermocouple wire, the common length is 500mm, the sheath diameter is Φ3~Φ8mm, and it has the characteristics of flexibility, high pressure resistance, fast thermal response time, and long service life.

 

Thermocouple Sheath Materials

 

Sheath Material

Maximum Continuous Temperature

Notes

Applications

Refractory Oxide recrystallised, e.g. Alumina Impervious

1750°C

Good choice for rare metal thermocouples. Good resistance to chemical attack. Mechanically strong but severe thermal shock should be avoided

Forging iron & steel. Incinerators carburizing and hardening in heat treatment. Continuous furnaces. Glass Lehrs.

Silicon Carbide (Porous)

1500°C

Good level of protection even in severe conditions. Good resistance to reasonable levels of thermal shock. Mechanically strong when thick wall is specified but becomes brittle when aged. Unsuitable for oxidising atmospheres but resists fluxes.

Forging iron & steel. Incinerators Billet heating, slab heating, butt welding. Soaking pits ceramic dryers.

Impervious Mullite

1600°C

Good choice for rare metal thermocouples under severe conditions. Resists Sulphurous and carbonaceous atmospheres. Good resistance to thermal shock should be avoided.

Forging iron & steel. Incinerators. Heat treatment. Glass flues. Continuous furnaces.

Mild Steel (cold drawn seamless)

600°C

Good physical protection but prone to rapid corrosion.

Annealing up to 500°C. Hardening pre-heaters. Baking ovens.

Stainless steel 25/20

1150°C

Resists corrosion even at elevated temperature. Can be used in Sulphurous atmospheres.

Heat treatment annealing, flues, many chemical processes. Vitreous enamelling. Corrosion resistant alternative to mild steel.

Inconel 600/800*

1200°C

Nickel-Chromium-Iron alloy which extends the properties of stainless steel 25/20 to higher operating temperatures. Excellent in Sulphur free atmospheres; superior corrosion resistance at higher temperatures. Good mechanical strength.

Annealing, carburizing, hardening. Iron and steel hot blast. Open hearth flue & stack. Waste heat boilers. Billet heating, slab heating. Continuous furnaces. Soaking pits. Cement exit flues & kilns. Vitreous enamelling. Glass flues and checkers. Gas superheaters. Incinerators up to 1000°C. Highly sulphurous atmospheres should be avoided above 800°C.

Chrome Iron

1100°C

Suitable for very adverse environments. Good mechanical strength. Resists severely corrosive and sulphurous atmospheres.

Annealing, carburizing, hardening. Iron & steel hot blast. Open hearth flue and stack. Waste heat boilers. Billet heating, slab heating. Continuous furnaces. Soaking pits. Cement exit flues & kilns. Vitreous enamelling. Glass flues and checkers. Gas superheaters. Incinerators up to 1000°C.

Nicrobell*

1300°C

Highly stable in vacuum and oxidising atmospheres. Corrosion resistance generally superior to stainless steels. Can be used in Sulphurous atmospheres at reduced temperatures. High operating temperature.

As Inconel plus excellent choice for vacuum furnaces and flues.

 

Functions of Thermocouple Sheaths

 

 

● Physical Protection: Acts as a barrier against physical damage like impact, vibration, and abrasion from the surrounding environment.


● Chemical Protection: Protects the thermocouple wires from corrosive chemicals or gases present in the process.


● Electrical Isolation: Acts as a Faraday cage, shielding the thermocouple wires from external electrical noise that could interfere with the temperature signal.


● Thermal Insulation: Minimizes heat transfer along the thermocouple wires, ensuring the measured temperature is representative of the specific point being monitored.


● Mechanical Support: Provides a rigid structure to insert the thermocouple into tight spaces or challenging locations within a process.


● Improved Response Time: Can enhance heat transfer to the sensing junction due to its design, leading to faster temperature readings.  

 

 
Thermocouple Sheath Installation Steps
 
01/

Location Selection
Select a location that represents the true temperature of the medium being measured. Avoid areas with direct heat radiation, strong magnetic field interference, and vibration sources. For fluids, install in a region with stable flow and no vortex. Ensure the installation position is easily accessible for future maintenance and replacement without affecting production operations.

02/

Mounting
Use appropriate brackets or clamps to securely fix the thermocouple sheath in the predetermined position. Ensure it is firmly fixed to prevent loosening due to vibration or fluid impact. When installing in a pipeline, ensure the sensing element is located in the area with the highest flow velocity. The end of the protective sheath should extend 5 to 10 mm beyond the centerline of the flow velocity.

03/

Wiring
Connect the wires to the terminal blocks according to the polarity of the thermocouple, and use insulating tape or heat-shrink tubing for insulation to prevent short circuits or leakage. Ensure that the cold junction of the thermocouple is at the same ambient temperature and use the same type of compensation wire. Pay attention to the correct connection of positive and negative poles.

04/

Calibration and Testing
After installation, use a standard thermometer to calibrate the thermocouple to ensure accurate measurements. Conduct an initial test to verify that the installation is correct and the measured values are stable.

 

Packaging and Shipping

 

Packaging

External Packaging: Sturdy cardboard box or wooden

Internal Packaging: Foam, bubble wrap, or other cushioning materials

Shipping

We will help you to choose the best shipping way according to your detail requirements. By sea, by air, or by express, etc.

 

Our Certificate

 

 

productcate-1-1

 

FAQ

Q: How to choose a suitable thermocouple sheath?

A: Choosing a suitable thermocouple sheath requires considering factors such as the properties of the measured medium (such as temperature, pressure, corrosiveness), measurement accuracy requirements, and installation environment. Generally speaking, you should choose a material that is compatible with the measured medium and ensure that the sleeve can withstand the temperature and pressure of the measured medium.

Q: What is the impact of thermocouple sheathes on measurement accuracy?

A: The material, thickness, length and other factors of thermocouple sheaths will affect the measurement accuracy. For example, the thermal conductivity of the sleeve material will affect the heat transfer, thereby affecting the response speed and measurement accuracy of the temperature measuring element. Therefore, when selecting and designing thermocouple sheaths, it is necessary to fully consider their impact on measurement accuracy.

Q: Do thermocouple sheathes require regular maintenance?

A: Yes, thermocouple sheathes require regular maintenance. Maintenance includes checking the sleeve for wear, cleaning dirt and dust on the sleeve surface, and checking the connection of the temperature measuring element. Regular maintenance can extend the service life of the sleeve and improve the accuracy and reliability of measurement.

Q: What should I do if the thermocouple sheath is damaged?

A: If the thermocouple sheath is damaged, such as cracks, corrosion or severe wear, it should be replaced with a new sleeve in time. During the replacement process, it is necessary to ensure that the material, specification and installation method of the new sleeve are consistent with the original sleeve to ensure the accuracy and stability of the measurement.

Q: How does the length of the thermocouple sheath affect the measurement?

A: The length of the thermocouple sheath affects the heat transfer and the response speed of the temperature measuring element. Generally speaking, the longer the sleeve, the longer the heat transfer path and the slower the response speed of the temperature measuring element. Therefore, under the premise of meeting the measurement requirements, the length of the sleeve should be shortened as much as possible to improve the measurement accuracy.

We're professional thermocouple sheath manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to buy high-grade thermocouple sheath made in China here from our factory.

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