VTS500 thermocouple Type K Type J Thermal Resistance Temperature Sensor
Product Features and Applications
Features:
♦ High accuracy and thermal response fast
♦ Various installation options to meet customer requirements
♦ K type armored thermocouple range: 0-1000℃
♦ Armored thermocouple range: (-200~+1300℃,could be made -270~+2800℃ for special conditions)
Applications:
Thermocouples are used in many industrial, scientific, and OEM applications. They can be found in nearly all industrial markets:
● Power Generation
● Oil/Gas
● Pharmaceutical
● BioTech
● Cement
● Paper & Pulp
K-Type Thermocouples
The most commonly used type in numerous industries and sectors. Type-K units are made from a combination of nickel-based wires (typically chromel/alumel), which results in an especially cost-effective thermocouple that tends to be accurate and reliable across a wide range of operating temperatures.
K-type thermocouples are generally used within ranges of -200 to +1260 celsius and are considered temperature accurate to a standard deviation of ±0.75%. This thermocouples have a wide range of potential applications due to being nickel-based, which means their wires are able to operate at a particularly wide range of temperatures and generally exhibit solid resistance to corrosion and oxidation.
Thermocouple wire in type-K specifications will generally include a positive leg made from roughly 90% nickel, 10% chromium, and a negative leg composed of around 95% nickel, 2% aluminium, 2% manganese and 1% silicon.
J-Type Thermocouples
These are another widely used variety, although they will generally have a narrower temperature range (-40 to +750 Celsius) than K-types, and exhibit a shorter overall lifespan if regularly exposed to more excessive heat. The positive leg of a type-J unit is made from iron wire, and the negative leg will be composed of a copper-nickel (constantan) alloy.
It’s one of the least expensive thermocouple varieties, and is considered versatile, being especially well-suited to use in
reducing (non-oxidising) atmospheres and vacuums, and is ideal for taking readings from many older types of equipment as well as inert materials. However, the iron components in J-type units are highly susceptible to oxidation, and should not be used in situations where they’re likely to be at risk of exposure to moisture of any kind.
N-Type Thermocouples
Consist of wires made from nicrosil-nisil alloys (nickel, chromium and silicon), and display many similar properties to those found in K-type thermocouples, with operating temperatures in the range of -270 to +1300 celsius.
However, they’re slightly more expensive than K varieties, owing to their more recent development in order to overcome certain issues with K-types in specific environments - in particular, the type-N offers better all-round stability in nuclear applications, and exhibits lower susceptibility to oxidation than K varieties under more extreme heat demands.
T-Type Thermocouples
Temperature ranges run between −200 to +350 celsius, and it’s noted for being an especially stable thermocouple configuration, composed of copper-constantan alloy wires. This makes it ideally suited to a variety of cryogenic and other extreme low-temperature applications, including a wide range of laboratory and similar deep-freeze conditions. It functions well in oxidising atmospheres too, and is frequently used for differential measurement due to the fact that only copper wires make direct contact with the probes.