Temperature sensors

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Temperature sensor with thermocouple (type K) “Sheath Type”

  • In stock
  • RoHS conform

The sheath-type temperature sensor has great advantages in sensitivity, shock resistance and low costs. This sensor has thermocouple wire which is covered by stainless-steel-sheath with inorganic insulation filled in high pressure.

Note: this product is designed to connect temperature controller (not included).

Our product’s features

Overview

This sensor has great advantages in sensitivity, shock resistance and low costs. This sensor has heating-wire which is covered by stainless-steel-sheath with inorganic insulation filled in high pressure. We could sell the sensor from one item order.

Features

The sheath-type temperature sensor has great advantages in sensitivity, shock resistance and low costs. This sensor has heating-wire which is covered by stainless-steel-sheath with inorganic insulation filled in high pressure.
However, it will cause serious low-durability if you use thermocouple in high temperature active gas atmosphere, please contact us for more information of safety use.

How “thermocouple” work?

The thermocouple is based on the Seebeck effect, which is the conversion of heat directly into electricity at the junction of different types of wire. It works in the circuit with two different metal wires. Electricity will occur if the two electric contacts have different temperatures. The strength of electricity depends on the difference of temperature. If one of the electric contacts is cut open, there will be thermoelectromotive force.

We have the knowledge of relations between difference of temperature and thermoelectromotive force so we can measure the temperature from DC voltmeter which is connected to the one-open-circuit. We call this circuit with two different metal wires “thermocouple” for measuring temperature.

The sheath-type temperature sensor has great advantages in sensitivity, shock resistance and low costs. This sensor has heating-wire which is covered by stainless-steel-sheath with inorganic insulation filled in high pressure.
However, it will cause serious low-durability if you use thermocouple in high temperature active gas atmosphere, please contact us for more information of safety use.
The sheath-type temperature sensor has three type of tip shapes below.

Ungrounded type (called “U”)

This U type has an advantage of low electrical effect to instruments or controllers because the thermocouple is completely insulated from outside stainless-sheath pipe. It has high mechanical strength because the sensing part is covered by sheath-metal.
This U type is the most popular thermocouple because of the insulation feature, however, its responsiveness is slower than type G and exposed type.

Grounded type (called “G”)

This G type is good for the products which focus on responsiveness. The wire’s tip is welded to the sheath-stainless steel, so it has great heat conduction to the sensing part from outside. It is also high mechanical strength. However, because of the structure, the thermocouple circuit is connected to the sheath, it will easily have electric effect from noise and electric shock. We recommend you be highly careful to ground wire and noise.
*We don’t carry this product

Exposed type

On this type, the sensing part is exposed from the sheath. It has the fastest responsiveness from others, but you need extra-care because the sensing part is easy to deform.
*We don’t carry this product

Product’s specification

Characteristic

Class Temperature range Tolerance
Class 1 Greater than -40 ℃ less than 375 ℃ ±1.5 ℃
Greater than 375 ℃ less than 1000 ℃ ±0.004・|t|
Class 2 Greater than -40 ℃ less than 333 ℃ ±2.5 ℃
Greater than 333 ℃ less than 1200 ℃ ±0.0075・|t|
Class 3 Greater than -167 ℃ less than 40 ℃ ±2.5 ℃
Greater than -200 ℃ less than -167 ℃ ±0.015・|t|

Thermocouple (type K) sheath type (glass coating)

Regular temperature: 250℃, Tolerance: Class2 (±2.5℃ or ±0.75%)
Product code φ(mm) L1(mm) L2(m)
TH-8159 3.2 100 1.5
TH-8159-1 3.2 100 3.0
TH-8159-2 3.2 100 5.0
TH-8185 3.2 300 3.0
TH-8182 3.2 500 3.0
TH-8192 3.2 50 3
TH-8163 1.6 100 3.0
TH-8163-1 1.6 100 1.5
TH-8196 1.0 100 3.0