|
Mineral Insulated
Thermocouples
Wide
choice of Sheaths, Cold and Hot Ends and
Conductor Types
Approval
to Power Station Standards
Standard
and Customised Designs
Special
Tolerances to order
General
Description
Our
mineral insulated thermocouples are manufactured from superior grade
materials. We provide technical expertise, advice, design and a manufacturing
facility second to none.
Thermocouple Types
| Type |
Conductor
Materials |
Standard
Tolerances (cl2) |
| K |
Nickel-Chromium
/Nickel-Aluminium |
40ºC to 333ºC
: ± 2.5ºC
333ºC to 1200ºC :
± 0.75% |
| J |
Iron/
Copper-Nickel |
-40ºC to 333ºC
: ± 2.5ºC
333ºC to 750ºC
: ± 0.75% |
| T |
Copper/Copper-Nickel |
-40ºC to 133ºC
: ±1ºC
133ºC to 350ºC
: 0.75% |
| E |
Nickel-Chromium/
Copper-Nickel |
-40ºC to 333ºC
: ± 2.5ºC
333ºC to 900ºC
: ± 0.75% |
| N |
Nickel-Chromium/
Nickel-Silicon |
40ºC to 333ºC
: ± 2.5ºC
333ºC to 1200ºC :
± 0.75% |
| B |
Platinum-30%Rhodium/
Platinum-6%Rhodium |
0 to 600ºC
: ±
1.5ºC
600ºC to 1700ºC :
± 0.25% |
| R |
Platinum-13%
Rhodium/ Platinum |
0 to 600ºC
: ±
1.5ºC
600ºC to 1600ºC :
± 0.25% |
| S |
Platinum-10%
Rhodium/ Platinum |
0 to 600ºC
: ±
1.5ºC
600ºC to 1600ºC :
± 0.25% |
Class 1 tolerances available to order
Applicable Standards
EMF VALUES:-
IEC 60854:1195,
ANSI mc 96.01
Tables of EMF values are available from Jagjan.
Refer to Technical Data Sheets JAG/TYPK, JAG/TYPJ,
JAG/TYPT, JAG/TYPE, JAG/TYPN,
JAG/TYPB, JAG/TYPR and JAG/TYPS.
Colour
Codes:- IEC
584-3:1989
A thermocouple colour code chart is available from Jagjan. Refer to Technical Data Sheet
JAG/TCC
Tolerances:-
IEC 60584-2:1982, ANSI MC 96.01
Hot End Junctions:-
Insulated
Junction:-
Insulated
hot end junctions are suitable for most applications, especially where low
EMF pick-up is essential. High insulation resistance is enhanced due to
extreme compaction of the high purity MgO powder insulation.
Grounded Junction
Bonded or grounded junctions offer a slightly
faster temperature response than the insulated junction type. Not recommended for multi-point
instrumentation.
Exposed Junction
:-
Bare
or exposed junction thermocouples provide extremely fast temperature
response. Although the exposed MgO is completely moisture sealed, it is
not recommended for corrosive environments or temperatures in excess of
300ºC.
Extended Tip
Junction :-
Extended
tip junctions can also be provided to special order. Their solid end makes
this type of construction ideal for spot welding or peening to the contact
surface. The standard version has a pointed tip 15 mm long. Other shapes
can be provided.
Reduced
Tip Junction :-
Reduced
tip junctions are ideal for applications where low mass and extremely fast
response times are required, together with good mechanical strength.
Sheaths
and Conductors :-
A
wide range of standard sheath materials are available, including 310, 304,
316, 321 Stainless
Steel, Inconel 600, Incolloy 800 and Cupro/Nickel. Thermocouple types
J,T,K,E and N can be supplied as standard, in simplex, duplex, and in most
cases triplex configurations
Special Sheaths :-
Special
sheaths are available including AISI 446 Stainless Steel, 347 Stainless Steel,
Nicrosil, Hastelloy etc.
Special Conductors
:-
A
wide range of special conductors are available including
Platinum-Rhodium/Platinum, Platinel and Tungsten/Rhenium.
Special
Coatings :-
A
wide variety of fluoroplastic coatings can be provided to meet corrosive
environments. Standard coatings include PPS, PVDF or PFA. Fluoroshield, a
fluorocarbon polymer, can also be provided.
The
table below shows the sheath/conductor combinations which are the most common,
and are available
at short notice from Jagjan
| Type
K- Nickel chromium/Nickel Aluminium |
| Sheath
material |
Outside
Diameter (mm) |
| 8.0 |
6.0 |
4.5 |
3.0 |
1.5 |
| 310
Stainless Steel |
Π|
Π|
Π|
Π|
Π|
| Inconelâ
600 |
Π|
Π|
Π|
Π|
Π|
| 316 Stainless Steel |
|
Π|
Π|
Π|
Π|
|
|
|
|
|
|
| Type
J- Iron/Copper-Nickel |
| Sheath
material |
Outside Diameter (mm) |
| 8.0 |
6.0 |
4.5 |
3.0 |
1.5 |
| 316 Stainless
Steel |
|
Π|
Π|
Π|
|
|
|
|
|
|
|
| Type
T- Copper/Copper-Nickel |
| Sheath
material |
Outside Diameter (mm) |
| 8.0 |
6.0 |
4.5 |
3.0 |
1.5 |
| 316 Stainless
Steel |
|
Π|
Π|
Π|
|
|
|
|
|
|
|
| Type
E- Nickel-Chromium/Copper-Nickel |
| Sheath
material |
Outside Diameter (mm) |
| 8.0 |
6.0 |
4.5 |
3.0 |
1.5 |
| 316 Stainless
Steel |
|
Π|
|
|
|
|
|
|
|
|
|
| Type
N- Nickel-Chromium/Nickel -Silicon |
| Sheath
material |
Outside Diameter (mm) |
| 8.0 |
6.0 |
4.5 |
3.0 |
1.5 |
| Inconelâ
600 |
Π|
Π|
|
|
|
Œ= Simplex
= Duplex
Fittings
:-
A
wide range of termination glands and adjustable compression fittings are
available to suit thermocouples of all diameters.
|
|
|
Sliding
Compression Fitting |
Transmitter
Baseplates :-
|
|
Thermocouples
can be manufactured with DIN mounting plates to suit temperature
transmitters. |
Moulded
Plugs :-
|
The
heavy duty plug is a standard round 2 pin moulded plug suitable for 1.0
mm, 1.5 mm, 2.0 mm, 3.0 mm, 4.5 mm and6.0 mm diameter
thermocouples. Maximum ambient temperature is 270oC. A duplex
version is also available . |
|
|
|
The
smaller plug is a miniature flat 2 pin moulded plug which can be fitted
to 1.0 mm, 1.5 mm, 2.0 mm and 3.0 mm diameter thermocouples. |
|
Both
heavy duty and smaller can be supplied in socket end versions. An alternative
range of high temperature plug and socket combinations is
available with ceramic bodies. |
Standard
Seals :-
|
A
Wide variety of standard and custom designed seals can be
manufactured to suit specific applications. |
|
The
C Pot is a stainless steel crimped - on epoxy resin seal, suitable
for 1.5 mm, 3.0 mm, 4.5 mm, 6.0 mm and 8.0 mm dianeter
thermocouples. |
|
|
|
Maximum
ambient temperature is 85oC when fitted with PVC tail
wires and 180oC when fitted with PTFE tail wires and
high temperature epoxy. |
Threaded Seals :-
|
The A Pot is an M8
threaded epox.y resin seal for 1.5 mm, 3.0 mm
and 4.5 mm thermocouples. |
|
|
|
The B Pot is an M10
threaded epoxy resin seal for 3.0 mm, 4.5 mm, 6.0 mm or 8.0 mm
thermocouples. Locknuts can be supplied. Maximum ambient temperature
is 85oC when fitted with PVC tail wires and 180oC when fitted with
PTFE tail wires and high temperature epoxy. |
Thermocouple
Material Selection Chart:-
|
T/C
Type |
Sheath Material |
Maximum Operating
Temperature |
Some Typical
Applications |
Remarks |
| K |
310
Stainless Steel |
1100oC |
Blast
Furnace Gases, Open Hearth Furnace Flues, Re-Heat and Annealing
Furnaces, Brick Kilns, Power Station Boilers, High Temperature
Superheater Tubes, Vitreous enamelling. |
Good
oxidation resistance properties but should not be subjected to
subsequent mainpulation. Satisfacotry in sulphur-bearing atmospheres. |
| K |
Inconel 600 |
1100oC |
Heat
Treatment Processes, Chemical Reactors, Annealing Furnaces- Trailing
Thermocouples, Soaking Pits, Glass Tank Flues, Cement Kilns,
Incinerators and Aircraft Engines. |
Excellent
high temperature strength and resistance to oxidation but should not
be used in sulphur-bearing atmospheres above 550oC. Very
good chemcal resistance, almost immune to chloride- ion stress
cracking |
| K |
321
Stainless Steel |
800oC |
Nuclear
Energy 'In-Pile' Instrumentation, Annealing Furnaces, Chemical Acid
Production (Acetic, Nitric etc.), Boiler Steam and feed water, Turbo
-Alternator Steam Measurement, Heat Exchangers. Food and Beverage
Processing. |
Excellent
resistance to corrosion in a wide range of industrial applications,
retaining good ductility properties. This grade is titanium stabilized
for improved welding characteristics. |
| K |
316
Stainless Steel |
900oC |
Applications
as 321SS, but with improved resistance to a wide range of more
aggressive chemicals. Widely used in paper Digesters. |
Best
corrosion resistance of the austenitic stainless steels, widely used
in chemical processing, offers useful resistance to H2S,
dry chlorine gas and sodium chloride. |
| E |
321
Stainless Steel |
800oC |
Annealing
Furnaces, Chemical Acid Production (Acetic, Nitric etc), high EMF
output ideal for low temperature sensitivity. |
Excellent
resistance to corrosion in a wide range of industrial applications,
retaining good ductility properties. This grade is titanium stabilized
for improved welding characteristics |
| J |
Inconel 600 |
800oC |
Polyehylene
Manufacture, Tar Stills, Paper Manufacturing Plant. |
Excellent
oxidation resistance, but should not be used in sulphur -bearing
atmospheres at temperatures above 550oC. Very good chemical
resistance, almost immune to chloride-ion stress cracking. |
| J |
321
Stainless Steel |
750oC |
Re- heat
and Annealing Fumaces aluminium Heat Treatment, Chemical Reactors,
Plastic injection Moulding Machines.
|
Excellent
resistance to corrosion in a wide range of industrial applications,
retaining good ductility properties. This grade is titanium stabilized
for improved welding characteristics. |
| T |
321
Stainless Steel |
400oC |
Producer
Gas Plant, Oil Lubricant Temperature Measurement, widely used in
Cryogenic applications. Type T thermocouples are more accurate than
other base metal types. |
Excellent
resistance to corrosion in a wide range of industrial applications,
retaining good ductility properties. This grade is titanium stabilized
for improved welding characteristics. |
| - |
Nicrobell |
1300oC |
Blast
Furnace Gases, Heat Treatment, Brick Kilns, Power Station Boilers,
Nuclear 'In-Pile' instrumentation, Semiconductor Manufacturing. |
Lowest
drift of the base metal thermocouple group, particularly good at
extreme temperatures and nuclear applications. Can replace expensive
platinum types in some applications. |
|
