Industrial thermocouples for non-ferrous metals

 

"CTAL" range


Such thermocouples are suited for immersion in the melting materials. They are therefore protected by a cast iron, silicon carbide or Sialon protecting tube. The choice of the material depends on the requested performances.

Each one of these protecting tube materials holds advantages and drawbacks as far as mechanical or thermal resistance or longevity are concerned. Environmental and operating conditions are key elements when it comes to choosing the right material. Protecting tubes offering good mechanical resistance are for instance recommended in high capacity melting ovens whereas protecting tubes with high resistance to corrosion are best suited for temperature

 

 

 cast iron

 silicon carbide

 sialon

   mechanical resistance

 +++

 +

 ++

   resistance to thermal shocks

 ++

 +

 +++

   résistance to wear and tear

 +

 +++

 +++

   wettability

 +

 ++

 +++

   thermal conductivity

 +++

 ++

 +++

   cost

 +++

 ++

 +

Type K, N, S thermocouples for temperature measuring up to +1200°C

Accuracy

Accuracy depends on :

  • Thermocouple wire tolerances as per NF EN 60584-2 standard
  • Tolerances of the sensors as per UTE 46201 standard
    Reduced tolerances are available on request


Mechanical data

Thermocouples may be mineral sheathed with magnesium oxide insulation for a stronger protection against corrosion.  They may also be protected under ceramic insulating beads.


Applicable standards

IEC 60584
UTE 46201
Additional applicable standards are taken into consideration upon customer request.

- "L1" length on customer request

- "L" length and "D" diameter depending on protecting tube material

 

sensing element :


Standard sensing elements:

simplex or duplex thermocouple
type: K, J, T, N or S

Specific sensing elements:

simplex or duplex thermocouple
type: E, B, R or C

 

insulation :


- Standard or high purity magnesium oxide (MgO)

- Ceramic insulating beads

 

hot junction :


ungrounded

 

protecting tube :

All protecting tubes may be supplied as spare parts.

 material

 diameter

 length

  enamelled cast iron

 45 mm

     300 to 1200 mm
  graphite silicon carbide

 50 mm
 52 mm
 54 mm
 55 mm
 65 mm

     300 to 1067 mm
     305 to 915 mm
     750 to 1060 mm
     850 mm
     255 mm
  nitrided silicon carbide

 25 mm

     460 to 1200 mm
  sialon (ceramics)

 22 mm

     460 to  800 mm

  • other diameters or lengths on request

Available fittings :

  • female:female  2" - 3/4"
  • 1/2" GCY, 3/4" GCY, 2" GCO fitting
  • 1/2" GCY female/female nipple
arm :


Electrogalvanized soft steel

cast iron fitting between arm and protecting tube

connecting head :


- Aluminium head with screwed or lever lid

- IP54 to IP67 protection index

- A connection via cable or connector may replace the connecting head

 

Recommendations

  • Cast iron protecting tubes must be dressed when not enamelled
  • Pre-heating is highly recommended to avoid thermal schocks
  • These sensors should be handled with care to avoid shocks, especially when cleaning slags
  • Other components than the protecting tube should stay in contact with the molten material

International colour code of compensating cables: 

 symbol

 +

 -

 Gaine

 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