Thermocouple Sensor / K and J Type Thermocouple

We offer an incredible selection of thermocouple sensors for thermal measurements. A quality thermocouple produces voltage in proportion to identified temperature changes. Our reliable and versatile products come from manufacturers with proven records of producing highly dependable thermocouples. These sensors can be utilized for direct process insertion or with thermowell and protection tubes. A wide variety of design, sheath material and diameter selections are available to suit a comprehensive range of applications.

Thermocouple SensorA thermocouple sensor device generates valuable measurements and provides input signals to process controllers. By choosing the proper thermocouple wiring and sheath materials, the appropriate device will be installed in a temperature control system.

Mineral insulated thermocouples are rapid responders with intense temperature capacities and magnesium oxide insulation. Standard industrial thermocouples can feature Teflon and fiberglass insulated leads. They vary by temperature range and exterior diameter.

Hi-Watt supplies the most reliable temperature sensors from globally respected manufacturers. Our thermocouple sensors and sensing instruments are available in general application (tube and wire), mineral insulated metal sheathed, high temperature, base metal, surface temperature and other thermocouple categories. K type thermocouple and J type thermocouple as well as other common type calibrations available depending on your application and specific needs.

Thermocouple Accessories

Hi-Watt offers a full line of accessories to accommodate your varying sensor requirements. These support products can be used to install and maintain your temperature sensor assemblies. Give us a call today for a quote.

  • Standard and Mini Connectors
  • Jack Panels
  • Connection Heads
  • Compression Fittings
  • Bayonet Adapters

Thermocouple Temperature Sensor for Processing

Our leading lines of thermocouple temperature sensors come with broad temperature range capabilities. Thermocouple devices are widely deployed for process and industry applications due to their measurement ranges and durable construction. Their specifications include various calibrations, with J type thermocouples and K type thermocouples commonly used. High temperature calibrations, such as R and S, are also available.

Factors to review in selecting a thermocouple include: temperature range, chemical resistance, system compatibility, and installation requirements. Specific calibrations coordinate with specific temperature ranges. Maximum temperatures are dictated by wire diameter. Call Hi-Watt in Detroit, Michigan to determine the unique advantages our sensors will bring to your company.

Thermocouple Types

There are a wide variety of types of thermocouples. The most popular being the K type thermocouple and the J type thermocouple which along with type T and E are what are known as “Base Metal” thermocouples. The types depend on variables such as temperature range, durability, resistance to vibration, chemical resistance and more. Contact Hi-Watt Inc. to find out which type of thermocouple will suit your application.


K Type Thermocouple vs J Type Thermocouple

The K type thermocouple probe is made of chromel and alumel. Alumel is a composite of silicon, manganese, aluminum and nickel, while chromel is composed of chrome and nickel. While inexpensive, a K type will still cost you more than a J type; however, the K type makes up for it by being able to read a wider temperature range than the J type. K types are also more resistant to corrosion than the iron-containing J types.

While thermocouples made of noble materials, such as the S, R or B types, do not experience aging of the emf characteristic as the K type does, the K type is touted as being the most stable among other thermocouples made of inexpensive materials. While a B type thermocouple can withstand incredibly high temperatures, you must be willing to pay the price of the platinum if you choose to use one. Keeping these features in mind, the question that arises is which sheathing composition, also known as a junction, is most optimal for the type K.

Advantages to an Exposed Thermocouple

If you are not working with any corrosive materials, you might find a benefit in using a bare wire junction. This simply means inserting the connected end into the process you need to read the temperature of, without any sheathing. The primary advantage to this layout is that you will get the fastest response to changes in temperatures. However, it is often advised not to use this method as it is more likely for the wires to degrade through corrosion.

Sheathed Thermocouple Junctions

When you choose a sheathed junction, you have a decision to make as to whether to go grounded or ungrounded. An ungrounded thermocouple keeps the wires welded together while covering them with a sheath. There may be an added layer of insulation between the sheath and the wires to protect from electrical interference.

The feature that makes this junction ungrounded is that the wires never actually come into contact with the sheath. This layout may serve you better if you are concerned about electrical interference, but do not need fast response times.

On the other hand, a grounded junction acts for many users as a middle ground between an exposed and ungrounded layout. With this design, the wires and sheath are all welded together. The problem that some people run into with this layout is that it is susceptible to electrical interference. However, in certain environments, a faster response time is necessary, and that is made possible due to the ease of heat transfer from the sheath to the wires. If you need a faster response time but are concerned about corrosion, a grounded thermocouple may be better suited for your situation.

Your Search Ends Here

We at Hi-Watt Inc. pride ourselves in providing quality temperature-reading devices for any kind of industrial application. We also offer the sensors required to provide accurate temperature readings, as well as bayonet adapters, compression fittings, connection heads, jack panels and connectors. If you would like to get a quote, call us today at 586-588-9479.

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