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Thermocouples

thermocouple

ECOMAX | Mineral Oxide Insulation Thermocouples

Temperature probes are basically two wires with particular thermoelectric features, electrically insulated from each other and from the external protection body.
The most significant input data needed to design a temperature probe are operative temperature range and working conditions.
This type of temperature gauge is very reliable and quickly responding. Depending on their various construction features, they are individually optimized to fully fit in a great number of industrial applications.
MgO-insulated thermocouples are made of two or more wires, inside a highly compacted MgO insulation powder.
We can use different construction materials for the external metallic body, according to the specific working conditions.
MgO-insulated thermocouples are manufactured and tested according to ASTM E608, and comply to ANSI MC 96.1 or DIN 43710 standards.

Types of MgO thermocouples

Type Sensor Element Insulation Body material External diameter mm
E Chromel/Constantan MgO AISI 304 - 900 �C 0.25 - 0.5 - 1 - 1.5 - 2
3 - 4.5 - 6 - 8 -12.7
J Iron/Constantan AISI 310 - 1150 �C
K Chromel/Alumel AISI 316 - 926 �C
R Pt 13% Rh/Platinum AISI 321 - 900 �C
T Copper/Constantan INCONEL 600 - 1150 �C

Standard junctions of sensitive elements

UNGROUNDED JUNCTION ungrounded junction The sensing junction between the leads is totally insulated both electrically and mechanically from the body. Main application is in very hard-working conditions (with vibrations, thermal shocks, chemically aggressive environment, etc.) under which it provides a long working life.
GROUNDED JUNCTION grounded junction The sensing junction between the leads is directly welded on the body. This solution allows a good performance under pressure, high humidity and mechanical stress. Also, it is particularly recommended to get a fast response.
EXPOSED JUNCTION exposed junction Fast responce is the feature of this junction. It is recommended for measurement of gas or solid surfaces in non-corrosive environment.

Thermocouples working ranges

The temperature range depends on the thermocouple type, see below diagram:


Working ranges
  • R = Pt 13% Rh/Platinum
  • T = Copper/Constantan
  • J = Iron/Constantan
  • E = Chromel/Constantan
  • K = Chromel/Alumel

Electrical signal of different thermocouples.

Type J,K,T - TC001

TC001

  • Type: J,K,T.
  • Type of sensor: grounded-ungrounded-exposed.
  • Body material: AISI 321 for J and T, INCONEL 600 for K.
  • Body O.D. (mm): 0,25-0,5-1-1,5-2-3-4,5-6-8.
  • Lenght L: upon request.
  • Junction number: one or two.
  • Very flexible sensor

Type J,K,T - TC002

TC002

  • Type: J,K,T.
  • Type of sensor: grounded-ungrounded-exposed.
  • Body material: AISI 321 for J and T, INCONEL 600 for K.
  • Body O.D. (mm): 0,25-0,5-1-1,5-2-3-4,5-6-8.
  • Lenght L: mm 300 standard, other on request.
  • Hot junction number: one or two.

Type J,K,T - TC003

TC003

Standard plug probe.

  • Type: J,K,T.
  • Type of sensor: grounded-ungrounded-exposed.
  • Body material: AISI 321 for J and T, INCONEL 600 for K.
  • Body O.D. (mm): 0,25-0,5-1-1,5-2-3-4,5-6-8.
  • Lenght L: mm 300 standard, other on request.
  • Hot junction number: one or two.

Type J,K,T - TC004

TC004

Bayonet type thermocouples adjustable pressure contact.

  • Type: J,K,T.
  • Type of sensing point: grounded-ungrounded-exposed.
  • Body material: AISI 321 for J and T, INCONEL 600 for K.
  • Body O.D. (mm): 1-1,5-2-3.

Type J,K,T - TC006

TC006

  • Type: J,K,T.
  • Type of sensor: grounded-ungrounded-exposed.
  • Body material: AISI 321 for J and T, INCONEL 600 for K.
  • Body O.D. (mm): 0,25-0,5-1-1,5-2-3-4,5-6-8-12,7.
  • Lenght L: mm 300 standard, other on request.
  • Thread fitting:1/2".
  • Hot junction number: one or two.

DARMAX | technical data

Grounded sensing point - Other types available upon request. Glass braid extension cables with tinned copper overbraid. Standard length: mm 2000. Hot junction number: one or two.

More info

Type Elem. sens Temp. max �C Diagram
TC400
  • Cylindrical probe for general purposes.
  • Body material: AISI 304.
  • Body O.D. (mm): 3-4-5-6-8.
  • Lenght L: upon request.
  • Linear shape or 45� or 90� bended available.
 JK -10 + 400-10 + 400 tc400
TC401
  • Bolt cylindrical probe for metallic plates.
  • Thread fixed fitting.
  • Probe: stainless steel AISI 304.
  • Bolt: Brass.
 JK -10 + 400-10 + 400 tc401
TC402
  • Spring probe for metallic plates.
  • Thread fixed fitting adjustable with bayonet-junction.
  • Probe: stainless steel AISI 304.
  • Thread fitting: stainless steel AISI 304.
  • Body O.D. (mm): 6-8.
  • Standard lenght: 15 mm.
 JK -10 + 400-10 + 400 tc402
TC403
  • Ring probe for flat surfaces.
  • Ring material: Brass.
 JK -10 + 250-10 + 250 tc403
TC404
  • Band probe for pipes.
  • Adjustable band fixing.
  • Body material: stainless steel AISI 304.
 JK -10 + 400-10 + 400 tc404
TC405
  • Metering probe for metallic plates with screw fixing.
 JK -10 + 400-10 + 400 tc405