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Type C Thermocouple - Temperature Sensors / Probes and Other Thermocouple Types

Type C Tungsten-5% Rhenium vs Tungsten-26% Rhenium

Formerly known as W5, Type C thermocouples (and all Tungsten/Rhenium thermocouples in general) are high temperature thermocouples intended for use in applications where other thermocouples would fail due to excessive heat or severe environmental conditions.

They have a reasonably high and relatively linear EMF output and provide an excellent accuracy for extremely high temperature measurements up to 4170°F (2300°C), far exceeding the capabilities of platinum thermocouples such as Type S.

Type C thermocouples should be used in vacuum, inert atmospheres or dry hydrogen applications to prevent failure from oxidation. C type thermocouples should never be used in the presence of oxygen at temperatures above 500°F and above 2190°F tungsten can become brittle due to recrystallisation.

We supply thermocouples in a range of ceramic sheaths or metal sheathed type C thermocouples in specialist sheath materials such as molybdenum, tantalum and niobium for use in a wide range of demanding applications within industries such as power generation, aerospace etc.

We also provide a range of additional services such as Calibration, Radiographic inspection (X-Ray), Positive Material Identification (XRF, Chemical Analysis), Helium Leak Testing and Tagging/Lasermarking/Etching of sensors.

What color is Type C Thermocouple wire

The ASTM E 230 color coding in the US is as follows:

Positive Leg = Green *,
Negative Leg = Red *,
Outer Sheath (Jacket) = Red,

* It should be noted that a lot of cable still in use and being supplied could well be to the industry accepted standard shown in the table below. If you are in any doubt about colour codes, please contact one of our engineers who will be pleased to assist you.

Thermocouple
Type
American Colour
Code to ASTM E 230
International Colour Code to IEC 60584-3
Industry accepted colours
to no officially recognised standard
Thermocouple
Cable

Extension

Cable
C - ASTM E 230 Type C Thermocouple IEC60584-3 Type C Thermocouple

High Temperature Ceramic Sheathed Thermocouples (Type 14)

with IP67 die
cast alloy head
Weatherproof die cast alloy screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies
with IP67 heavy duty
cast iron head
Weatherproof cast iron screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies

High Temperature Metal Sheathed Type C Thermocouples (Type 27)

These high temperature thermocouples are used in applications where other thermocouples would fail due to excessive heat or severe environments. Utilising specialist exotic sheath materials such as Platinum 10% Rhodium, Molybdenum and Tantalum they can be used in service temperatures up to 4170°F. The combination of conductor, insulation material and sheath must be carefully selected to suit your process environment, service temperature and installation requirements (ie. whether the probe is flexible or not). Our experienced sales team are on hand to assist where required so please contact us if help is required.

with Basic End Seal
0.040" to 0.250" dia.
Internal seal with bare conductors
with Pot Seal
0.040" to 0.250" dia.
c type thermocouple with pot seals a large selection of plain and threaded pot seals supplied with tails or extension wire (PVC, FEP, Fiberglass etc.)
with Miniature Plug
0.040" to 0.125" dia.
type c thermocouple with miniature plug fitted with a miniature thermocouple plug rated to either 428ºF, 572ºF, 797ºF or 1112ºF
with Miniature Socket
0.040" to 0.125"
type c thermocouple with miniature socketfitted with a miniature thermocouple socket rated to either 428ºF, 572ºF, 797ºF or 1112ºF
with Standard Plug
0.040" to 0.250"
type c thermocouple with standard plugfitted with a standard thermocouple plug rated to either 428ºF, 572ºF, 797ºF or 1112ºF
with Standard Socket
0.040" to 0.250"
type c thermocouple with standard socketfitted with a standard thermocouple socket rated to either 428ºF, 572ºF, 797ºF or 1112ºF
with Micro die cast alloy head 0.125" to 0.188" dia. Micro die cast alloy screw down terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies with Miniature IP67 die cast head 0.125" to 0.188" dia.Weatherproof die cast alloy screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies with Standard IP67 die cast head 0.188" to 0.250" dia. Weatherproof die cast alloy screw top terminal head with ceramic terminal block. Suitable for simplex, duplex and triplex assemblies with BUZ style flip top head
0.188" to 0.250" dia.
Weatherproof die cast alloy screw down 'flip' terminal head (equivalent to DANA). Suitable for simplex, duplex and triplex assemblies
with die cast angled head
0.188" to 0.250" dia.
Weatherproof die cast alloy, epoxy coated, angled terminal head. Suitable for simplex and duplex assemblies
with 316 Stainless Steel head
0.188" to 0.250" dia.
Weatherproof 316 stainless steel screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies

Thermocouple Type C - Accuracies and Output Data

Conductor Combination Approximate generated
EMF change in µV
per ºC change
(referenced to 0ºC) at:
Approximate Working
Temperature Range
Initial Calibration Tolerances to ASTM E-230
(whichever is greater)
+ Leg - Leg 100ºC 500ºC 1000ºC ºF ºC Standard Special
Tungsten 5% Rhenium
Tungsten 26% Rhenium
15 18 18 32 to 4200 0 to 2315 ±4.4 or ±1% -
Type C is not an officially recognised symbol. At a given temperature that is expressed in °C, the tolerance in °F is 1.8 times the tolerance in °C. Percentage based tolerances must be computed from the temperature in °C. EMF versus temperature relationship may change with time during use. Tolerances in the above table are stated for new thermocouple wire and thermocouples. Thermocouples are normally supplied to meet the tolerances for temperatures above 32°F. If materials are required to meet the tolerances below 32°F, it should be stated at the time of the order.

what is a thermocouple?


How does a Themocouple work? Click here for technical data on Thermocouple Sensors.
Free Guide to Thermocouple and Resistance Thermometry

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