Industrial thermocouple sensors with metallic protector

"CTOT" range

These industrial thermocouples are used in the process and power industries. 

Thermocouples are protected by one metallic protecting tube or by one internal ceramic protector and one external metallic protector. The choice of the tube material depends on the temperature to be measured and on the atmosphere (inert, oxidizing, reducing or sulfurous atmospheres).

The sensor can be fixed by fixed or sliding fitting, or by a welded or adjustable flange.

Connection to the regulating system is made through a connecting head, generally in aluminium, equiped with a ceramic terminal block or a transmitter.


Maximum working temperature for metallic protecting tubes in different atmospheres:

 material

 inert

 oxidizing  oxidizing sulfurous  reducing  réducing sulfurous
    304 SS - 316 SS

 900

 850

 750

 750

 700

    310  SS

 1150

 1150

 1050

 1050

 850

    AISI446

 1150

 1150

 1100

 1050

 800

    inconel 600

 1150

 1050

 800

 1150

 540

Characteristics of the internal ceramic protectors :

 material

 temperature resistance

 resistance to
thermal shocks

 resistance to mechanical shocks

  tight refractory ceramics,
  type: 610

 1600°C

 -

 -

  tight pure alumina,
  type: 710

 1600°C

 +

 -

The mostly used thermocouples are K , J, T or N type.

Mechanical data

These thermocouples are generally insulated by ceramic beads. They may also be mineral insulated with magnesium oxide stuffing which gives a higher protection against corrosion.

Accuracy

Accuracy is defined by the thermocouple wires tolerances as per IEC 584 standard  


Applicable standards 

IEC 584
UTE 46201
Specific standards are taken into consideration whenever requested by customers.

 


- Length under head : < 300 to 2000 mm
- Outside diameter : 13.5 to 26.7 mm

sensing element :


-  K, J, T, N


hot junction :


- generally ungrounded hot junction

 

insulation :


- ceramic insulating beads or tube
- magnesium oxide (MgO) in case of MI cable

 

protecting tube :


External protector:
- Stainless steel: 304L, 316L, 310
- AISI 446
- Inconel 600

Internal protector:
- Tight refractory ceramics, type 610
- Porous refractory ceramics, type 530
- Pure alumina, type 710

 

connecting head :
- stainless steel or inox
- screwed or lever lid
- IP54 or IP68 protection
- ceramic terminal block
- transmitter

options :


- fixed or sliding threaded fitting
- welded or adjustable flange

 


International colour code for compensating cable : 

 symbol

 +

 -

 sheath

 JC

 black

 white

 black

 KC

 green

 white

 green

 TC

 brown

 white

 brown

 NC

 pink

 white

 pink

 SC / RC

 orange

 white

 orange

 BC

 grey

 white

 grey

IEC 584-3 standard

Setting up:

- welded or sliding fitting
- welded or adjustable flange

Connection:

- Terminal block
- Transmitter