thermoleitung ausgleichsleitung unterschied-thermocouple compensating cable difference

thermocouple compensating cable difference

Ausgleichsleitungen und Thermoleitungen werden für die Verbindung zwischen den Enden des Thermoelements und der Vergleichsstelle verwendet, für den Fall das die Schenkel des Thermopaares nicht direkt mit der Vergleichsstelle verbunden werden können.

Ausgleichsleitungen werden aus Ersatzwerkstoffen hergestellt, die eine andere Zusammensetzung haben als das Thermopaar. Sie werden mit dem Buchstaben „C“ gekennzeichnet, jeweils nach dem Kennbuchstaben des Thermoelements z. B. „KC“. In einzelnen Fällen gelten unterschiedliche Grenzwerte für verschiedene Temperaturbereiche bei demselben Thermopaar. Die entsprechenden Ausgleichsleitungen sind durch einen zusätzlichen Buchstaben zu unterscheiden, z. B. KCA und KCB.

Thermoleitungen werden aus Leitern hergestellt, die die gleiche Zusammensetzung haben wie das entsprechenden Thermopaar. Sie werden gekennzeichnet mit dem Buchstaben „X“, ebenso nach dem jeweiligen Kennbuchstaben des Thermoelements z.B. „KX“

Grenzabweichungen für Thermoleitungen und Ausgleichsleitungen DIN EN 60584-3:

Grenzabweichungen für Thermo- und Ausgleichsleitungen sind in der DIN EN 60584-3 festgelegt. Es gibt zwei Genauigkeitsklassen. Die bessere Genauigkeitsklasse 1 ist nur bei Thermoleitungen möglich.
Die Klasse 2 gibt es sowohl für Thermoleitungen als auch für Ausgleichsleitungen.

thermocouple compensating cable function

Manufacturing capabilities

compensating cable type k, multi-core
  1. Conductor materials :
    thermal and compensation materials, pure nickel,
    bare copper, tinned, silver-plated or nickel-plated.
    Conductor cross-sections: 0.005 mm² to 50 mm²
  2. Stranding:
    2 to 50 cores in layers or pairs
  3. Insulation and jacket materials :
  • PVC + 105 ° C
  • ETFE + 155 ° C
  • Silicone + 180 ° C
  • FEP + 200 ° C
  • PTFE + 260 ° C
  • PFA + 260 ° C
  • Glass fiber (E) + 400 ° C
  • Glass fiber (R) + 800 ° C
  • Quartz glass + 1000 ° C
  • Ceramic fiber + 1300 ° C
  1. Foil (screen) : PTFE, polyester, laminated aluminum and polyimide (Kapton®)
  2. Shielding: braids made of tinned, silver and nickel-plated copper
  3. Reinforcements : braids made of galvanized steel wire or stainless steel wire

The difference between
extension cable & compensating cable

Compensating cables and extension cables are used for the connection between the ends of the thermocouple and the reference junction in the event that the legs of the thermocouple cannot be connected directly to the reference junction.

Measurement setup

Compensating cables are made from substitute materials that have a different composition than the thermocouple. They are marked with the letter “C”, in each case after the code letter of the thermocouple z. B. “KC”. In individual cases, different limit values ​​apply to different temperature ranges for the same thermocouple. The corresponding compensating lines must be distinguished by an additional letter, e.g. B. KCA and KCB.

Extension cables are made from conductors that have the same composition as the corresponding thermocouple. They are marked with the letter “X”, also after the respective code letter of the thermocouple, eg “KX”(see DIN EN 60584-3: 2008-08 )

Limit

deviations for extension cables and compensating cables DIN EN 60584-3: Limit deviations for extension cables and compensating cables are specified in DIN EN 60584-3. There are two classes of accuracy. The better accuracy class 1 is only possible with extension cables.
Class 2 is available for extension cables as well as compensating cables.

TypeAccuracy class 1Accuracy class 2Application temperature range
KX± 60 μV (± 1.5 ° C)± 100 μV (± 2.5 ° C)– 25 ° C to + 200 ° C
JX± 85 μV (± 1.5 ° C)± 140 μV (± 2.5 ° C)– 25 ° C to + 200 ° C
TX± 30 μV (± 0.5 ° C)± 60 μV (± 1.0 ° C)– 25 ° C to + 100 ° C
EX± 120 μV (± 1.5 ° C)± 200 μV (± 2.5 ° C)– 25 ° C to + 200 ° C
NX± 60 μV (± 1.5 ° C)± 100 μV (± 2.5 ° C)– 25 ° C to + 200 ° C
KCA± 100 μV (± 2.5 ° C)0 ° C to + 150 ° C
KCB± 100 μV (± 2.5 ° C)0 ° C to + 100 ° C
NC± 100 μV (± 2.5 ° C)0 ° C to + 150 ° C
RCA± 30 μV (± 2.5 ° C)0 ° C to + 100 ° C
RCB± 60 μV (± 5.0 ° C)0 ° C to + 200 ° C
SCA± 30 μV (± 2.5 ° C)0 ° C to + 100 ° C
SCB± 60 μV (± 5.0 ° C)0 ° C to + 200 ° C

Limit deviations for extension cables and compensating cables DIN EN 60584-3: 2008-08

Color coding for extension cables and compensating cables DIN EN 60584-3:

Color coding extension cables, compensating cables, intrinsically safe

The outer jacket, if present, must be colored as shown in the illustration above. With one exception in the case of intrinsically safe circuits, the outer jacket must be colored blue.

Color coding type K extension cables Compensating cables ANSI MC96.1

Color coding ANSI MC96.1

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