Atex Thermocouple
What is Atex Thermocouple
A thermocouple is formed by fusing two different metals or alloys. The point at which the metals are fused is placed the point whose temperature is to be measured. This is called the hot junction of the thermocouple. The other end is called the cold junction. An electro motive force / voltage is generated between these junctions which is measured or used in an electronic circuit.
Benefits of Atex Thermocouple
Wide Temperature Range
Thermocouples can measure temperatures ranging from very low (cryogenic temperatures) to very high (over 2000°C), making them suitable for a wide range of applications.
Fast Response Time
Thermocouples have a rapid response time, meaning they can quickly detect changes in temperature, which is crucial in processes where temperature changes occur rapidly.
Simple Construction
Thermocouples consist of only two wires made from different metals joined at one end. This simplicity makes them easy to manufacture, install, and replace.
Ruggedness
Thermocouples are robust and resistant to vibration, mechanical shock, and environmental factors such as moisture and corrosion, making them suitable for harsh industrial environments.
Why Choose Us
One-stop Service
We promise to provide you with the fastest reply, the best price, the best quality, and the most complete after-sales service.
Competitive Pricing
We offer competitive pricing for our services without compromising on quality. Our prices are transparent, and we do not believe in hidden charges or fees.
Best After Service
Provide professional installation and training. Detailed operation manual and video for customer installation. Any problems will be solved within 24 hours. Broken parts will be sent to customer by air during guarantee period.
State-of-the-art Technology
We use the latest technology and tools to deliver high quality services. Our team is well-versed in the and advancements in technology and uses them to provide the best results.
Steel And Iron Industries
Thermocouples are used to monitor the temperature and chemistry of molten metal during various stages of the steel-making process. Types B, S, R, and K thermocouples are commonly used in electric arc furnaces, ladles, tundishes, molds, and rollers.
Gas Appliances
Thermocouples are used to detect the presence of a pilot flame in gas heaters, boilers, ovens, stoves, and fireplaces. If the pilot flame goes out, the thermocouple shuts off the gas supply to prevent gas leakage or explosion.
Thermopile Radiation Sensors
Thermopiles are arrays of thermocouples connected in series that measure the intensity of incident radiation (especially visible and infrared light). They are used in devices such as pyrometers, radiometers, spectrometers, thermal cameras, and solar panels.
Manufacturing
Thermocouples are used to measure and control the temperature of various processes and products in manufacturing industries such as food processing, chemical processing, pharmaceutical, aerospace, automotive, and biomedical industries. Types K, J, T, E, and N thermocouples are commonly used to measure and control the temperature of various processes and products in these industries.
Power Production
Thermocouples are used to measure and monitor the temperature of various components and systems in power plants, such as boilers, turbines, generators, transformers, reactors, and fuel cells. Types R, S, B, K, and N thermocouples are commonly used in power production applications.
Process Plants
Thermocouples are used to measure and control the temperature of various fluids and gases in process plants, such as oil refineries, petrochemical plants, gas pipelines, and water treatment plants. Types K, J, T, E, and N thermocouples are commonly used in process plant applications.
Thermocouples As Vacuum Gauge
Thermocouples can be used to measure the pressure of a vacuum by measuring the temperature difference between a heated wire and an unheated wire in a thermocouple circuit. The pressure of the vacuum is inversely proportional to the temperature difference. This type of vacuum gauge is known as a thermocouple gauge or a Pirani gauge.
Determine The Application Scenario
Thermocouples can be used across industries and applications, so selecting the right one starts with knowing exactly how and where you want to use it
Determine The Temperature Range
The temperature range of the selected thermocouple should preferably cover the desired temperature range. This requires us to know the temperature range of different types of thermocouples.
A type K thermocouple offers a wide temperature range and is one of the most often used thermocouples. However, if your thermocouple probe will be exposed to extreme temperatures, a type N thermocouple is more stable in high temperatures and a type T thermocouple is best for extremely low temperatures.
Determine The Fast Response Time And Durability
There are three types of thermocouple junctions: exposed, grounded or ungrounded. An exposed junction will provide the fastest response time. However, if the probe will be exposed to corrosive gas or high pressure, an exposed junction should not be used. An ungrounded thermocouple offers the slowest response time but can still be the best choice if it is also desirable to have the thermocouple electronically isolated from and shielded by the sheath. Generally, thermocouples with large wire diameters have very good durability but poor thermal response.
Consider The Operating Environment
An exposed thermocouple is limited in use to noncorrosive applications. Both a grounded or ungrounded thermocouple can be used in corrosive or high-pressure environments, but an ungrounded probe is best if there is a need to have the thermocouple electronically isolated from and shielded by the sheath.
Consider The Installation Requirements
The thermocouple may need to be compatible with existing equipment.
Consider The Price
Noble metal thermocouples are generally more expensive than base metal thermocouples. Users can select the appropriate thermocouple according to the actual situation to ensure the normal measurement.
What are the different types of thermocouples
B-Type Thermocouple
Type B thermocouple comprises of Platinum (30% Rhodium) and Platinum (6% Rhodium) alloy. It has a high-temperature range between 1370 to 1700 °C, making it suitable for applications with very high temperatures like glass production.
E-Type Thermocouple
Type E thermocouple comprises Chromel and Constantan alloys. It has a lower temperature range than type B (0 to 870 °C). They can be used in an inert environment, but they need to be protected against a sulphurous environment. Type E thermocouples are mostly used in power plants.
J-Type Thermocouple
Type J thermocouple comprises of Iron and Constantan. It has a low-temperature range of 0 to 760 °C. This type of thermocouple is used primarily in inert and vacuum environments. One of the most common applications is Injection moulding.
K-Type Thermocouple
Type K thermocouple is made of Chromel and Alumel. It has a temperature range between 95 and 1260 °C. It is best suited for neutral or oxidising environments and is mostly used in refineries.
N-Type Thermocouple
The alloys used for type N thermocouples are Nicrosil and Nisil. Its temperature range is between 650 to 1260 °C. The unique point of this type of thermocouple is that it offers high resistance to degradation due to green rot and hysteresis. Generally, type N thermocouples are used in petrochemical and refineries industries.
R-Type Thermocouple
Type R thermocouples comprise of a combination of Platinum (13% Rhodium) and Platinum and have a temperature range between 870 to 1450 °C. Due to the fact that they are very stable and accurate, they are used in Sulphur recovery units.
S-Type Thermocouple
Type S thermocouples are a mixture of Platinum (10% Rhodium) and Platinum. They have a higher temperature range between 980 to 1450 °C making them perfect for applications involving high temperatures.
T-Type Thermocouple
Last but not least, type T thermocouple comprises Copper and Constantan. The temperature range it has is between -200 to 370°C. It is suitable for inert and vacuum environments, making it perfect to be used in cryogenics and food production.
How does it work thermocouple
Two different metals are joined to make a thermocouple. Both the metals after connecting form two junctions that are subjected to different temperatures. The difference in the temperature of junctions generates Peltier emf within the circuit.
The temperature at both the junctions should be necessarily different as the equal temperature will result in zero net current flowing through the circuit. The generated emf in the circuit depends on the materials used as metals in making the thermocouple.
A device for measuring the emf/current flowing through the circuit is attached to the thermocouple. It measures the current flow which is generated by the temperature difference of the two metals in the thermocouple. The temperature of the reference junction is known and the other junction is unknown.
The output of the circuit is calibrated against the junction with the unknown temperature.the temperature of the unknown junction is determined using the thermocouple.
To measure the current, highly sensitive instruments are used as the emf developed in the circuit is very small. The most commonly used devices are voltage balancing potentiometer and galvanometer.
How Do You Install and Maintain a Thermocouple
Select a suitable location for the thermocouple probe or wire that will ensure good contact with the object or medium whose temperature is to be measured. Avoid locations that are exposed to excessive heat, moisture, corrosion, vibration, or mechanical stress.
Connect the thermocouple wires to the measuring instrument according to the polarity and color code of the thermocouple type. Use appropriate connectors, terminals, or adapters that match the thermocouple type and size. Avoid loose or broken connections that may cause errors or noise in the thermocouple circuit.
Calibrate the thermocouple and the measuring instrument before use to ensure accuracy and consistency of measurement. You can use a reference thermometer or a calibration source to compare the thermocouple output with a known temperature value. You can also use a calibration table or a formula to correct for any deviation or error in the thermocouple output.
Check the thermocouple regularly for any signs of damage, corrosion, contamination, or aging that may affect its performance or reliability. Replace the thermocouple if it shows any signs of deterioration or failure.
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FAQ
Q: What is a thermocouple?
Said in another way, a thermocouple is a very simple, robust and inexpensive sensor for temperature measurement which is used in a variety of processes for measuring temperature.
Q: How does a thermocouple work?
Q: What happens if a thermocouple fails?
Q: What problems you can have with thermocouples?
Thermocouple drift occurs because the materials get used at the upper end of their practical range which causes material deterioration and that affects the output. Thermocouple replacement is the only solution to that problem.
For high temperatures, rare metals are used which can become very expensive.
Q: What are the advantages of using thermocouples?
Q: How do you set up a thermocouple?
The position of the hot junction needs to be carefully thought about to avoid radiant energy from the heaters. The hot junction also needs to be sufficiently immersed in the process to avoid conduction errors along with the sensor itself.
Q: What are the materials used for thermocouples?
Q: How many wires does a thermocouple have?
For example, the positive (+) conductor of a type K thermocouple is made of a chromium/nickel alloy called chromel and the negative (-) conductor is made of an aluminum/nickel alloy called alumel. The wire which is used to make a thermocouple junction is called thermocouple wire.
Q: Thermocouple probes vs. Thermocouple wire?
Each calibration has a different temperature range and environment, although the maximum temperature varies with the diameter of the wire used in the thermocouple.
Although thermocouple calibration dictates the temperature range, the maximum range is also limited by the the diameter of the thermocouple wire. That is, a very thin thermocouple may not reach the full temperature range.
K Type Thermocouples are known as general purpose thermocouple due to its low cost and temperature range.
Q: How do I choose a thermocouple?
The most commonly criteria used to make that choice are the temperature range, the chemical resistance, the abrasion and vibration resistance and the installation requirements. Installation requirements would also dictate your choice of a thermocouple probe.
There are different types of thermocouples and their applications may vary. An exposed thermocouple will work best when high response times are required, but an ungrounded thermocouple is better in corrosive environments.
Q: How do I know which junction type to choose?
Q: What are the accuracies and temperature ranges of the various thermocouples?
Q: Thermocouple probes vs. Thermocouple wire?
Using a wire style sensor may be fine if the fluid does not attack the insulation or conductor materials, if the fluid is at rest or nearly so, and the temperature is within the capability of the materials. But say that the fluid is corrosive, high temperature, under high pressure or flowing through a pipe, then a probe style sensor, maybe even with a thermowell, will be a better selection.
It all comes down to how best get the thermocouple junction to the same temperature as the process or material you are trying to measure the temperature of, so to get the information you need.
Q: Which is more accurate thermometer or thermocouple?
Q: How many volts does a thermocouple put out?
This small value of voltage, usually around 25 – 30 DC millivolts, provides the power to hold the pilot light valve open during normal operation. The types of metals used in the construction of the thermocouple depend upon the values of temperature they are to be subjected to.
Q: What is the most reliable thermocouple?
Q: What is the best thermocouple for high temperature?
Q: How do you know if you have a bad thermocouple?
Q: How do you test a thermocouple with a magnet?
Q: What happens if a thermocouple fails?
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Atex Thermocouple