Temperature
sensor
Products overview
Standard thermocouple
Sheathed thermocouple
Mineral insulated thermocouple
Thermocouple with bayonet fitting
Thermocouple for nozzle
Thermocouple with clamping ring
Thermocouple J sur plaquette
100 WPlatinum Sensor (PT100)
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Product overview


Products > Temperature sensor > Product overview.

 

INTRODUCTION :

There are many types of temperature sensors that will use various technologies and have different shapes. These sensors are used in many fields in the industry and in household equipment.

Appliances (ovens, refrigerators…), cars (engine, car interior), processing industries (plastic, food, chemical, car, electronics industries …), domestic and industrial heating facilities.


Among the various types of temperature sensors are thermocouples and resistor sensors:

  • Thermocouples generate an electromotive force (mV) when temperature of “hot weld” of thermocouple (which is in contact with heat source) is different from temperature of “cold weld” (the “cold weld” being the benchmark) . This value corresponds with a temperature according to international standards. An electronic device conGreens this value into a temperature in order to display it (temperature indicator) or regulate it (temperature regulator). There are J type thermocouples (iron/constantan), K type thermocouples (nickel chromium / aluminium plated nickel), S type thermocouples (platinum /rhodium plated platinum), etc …
  • Resistor sensors use variations of resistivity of materials according to temperatures. To the measured value corresponds a temperature according to international standards. Data are collected by a temperature indicator or a temperature regulator. Among resistor sensors are the standardized PT100 platinum sensor, thermistor sensors, etc…

The vast majority of recent regulators can work with thermocouples (J, K, …) or resistor sensors (PT100) after being set up adequately.



Operating temperature range :

The operating temperature range of thermocouples and platinum sensors is shown in below table. The adequate type of temperature sensor will be selected depending on operating temperature and application (see various types).

 

type

Positive

Negative

Temperature range

J Thermocouple

Iron

Constantan

0° C / +760° C
(32°F / 1400°F)

K Thermocouple

Nickel chromium
(or Chromel)

Aluminium plated nickel
(or Alumel)

0° C / +1260° C
(32°F / 2300°F)

PT 100
Platinum sensor

 

 

-200°C / +850°C
(-360°F to 1562°F)



Color codes :

Color codes enable someone to identify the type of thermocouple that is being used, together with international or national standards applied and polarity of each thermocouple wire. As standard, we would use the international norm.

J  type thermocouple :

Polarity IEC 584*
(International)
AFNOR(France)  DIN(Germany) ANSI(USA)
Iron + Black Yellow Red White
Constantan - White Black Blue Red



K type thermocouple :

Polarity IEC 584*
(International)
AFNOR(France)  DIN(Germany) ANSI(USA)
Nickel chromium (Chromel) + Green Yellow Red Yellow
Aluminium plated nickel (Alumel) - White Violet Green Red
* IEC 584 : International Electrical Component

Platinum sensor : :

Connecting diagram:

Tolerances :

Thermocouples (Class 2):

Thermocouples  
J ±2.5°C (±4.5°F) from 0 to 330°C (32 to 626°F)
±0.75 % from 330°C to 760°C (626 to 1400°F)
K ±2.5°C (±4.5°F) from 0 to 330°C (32 to 626°F)
±0.75 % from 330°C to 1260°C (626 to 2300°F)
 

100 W at 0°C (32°F) Platinum Sensor (Class B) :

Temperature °C Tolerance
IEC 751:1983 (NF C 42-330, DIN 43790, BS 1904)
CLASS A CLASS B
± C° ± Ohms ± C° ± Ohms
-200 0.55 0.24 1.3 0.56
-100 0.35 0.14 0.8 0.32
0 0.15 0.06 0.3 0.12
100 0.35 0.13 0.8 0.30
200 0.55 0.20 1.3 0.48
300 0.75 0.27 1.8 0.64
400 0.95 0.33 2.3 0.79
500 1.15 0.38 2.8 0.93
600 1.35 0.43 3.3 1.06
650 1.45 0.46 3.6 1.13
700 - - 3.8 1.17
800 - - 4.3 1.28
850 - - 4.6 1.34