Type J Thermocouple (Iron/Constantan)
Composed of a positive leg which is iron and a negative leg which is approximately 45 % nickel-55% copper. (Note - Constantan is Copper-Nickel.)
MAXIMUM TEMPERATURE RANGE
Thermocouple Grade 32 to 1382�F, 0 to 750�C
Extension Grade 32 to 392�F, 0 to 200�C
LIMITS OF ERROR(whichever is greater)
Standard:2.2�C or 0.75%, Special:1.1�C or 0.4%
COMMENTS, BARE WIRE ENVIRONMENT:
Reducing, Vacuum, Inert; Type J thermocouples degrade rapidly in oxidising atmospheres above 550�C. Their maximum continuous operating temperature is around 750�C though they can with stand short duration excursions to 1000�C. They are generally not used below ambient temperature due to condensation forming on the wires leading to rusting of the iron.
; Not Recommended for Low Temperatures
TEMPERATURE IN DEGREES �F REFERENCE JUNCTION AT 32�F
Description
When protected by compacted mineral insulation and appropriate outer sheath, Type J is useable from 0 to 816C, (32 to 1500F). It is not susceptible to aging in the 371 to 538C, (700 to 1000F) temperature range. A drift rate of 1 to 2C, (2 to 4 F) occurs with Type E and K in the 371 to 538C, (700 to 1000F) temperature range. This low cost, stable calibration is primarily used with 96% pure MgO insulation and a stainless steel sheath.
Type K Thermocouple (Chromel / Alumel)
Composed of a positive leg, which is approximately 90% nickel, 10 chromium and a negative leg, which is approximately 95% nickel, 2% aluminum, 2% manganese and 1% silicon.
Due to its reliability and accuracy, Type K is used extensively at temperatures up to 1260�C (2300�F). It's good practice to protect this type of thermocouple with a suitable metal or ceramic protecting tube, especially in reducing atmospheres. In oxidizing atmospheres, such as electric furnaces, tube protection is not always necessary when other conditions are suitable; however, it is recommended for cleanliness and general mechanical protection. Type K will generally outlast Type J because the JP (iron) wire rapidly oxidizes, especially at higher temperatures.
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Type E Thermocouple (Chromel / Constantan)
Composed of a positive leg which is approximately 90% Nickel, 10% Chromium and a negative leg which is approximately 45% Nickel, 55% copper.
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Type T Thermocouple (Copper / Constantan)
Composed of a positive leg which is pure copper and a negative leg which is approximately 45 % nickel, 55 % copper.)
This thermocouple can be used in either oxidizing or reducing atmospheres, though for longer life a protecting tube is recommended. Because of its stability at lower temperatures, this is a superior thermocouple for a wide variety of applications in low and cryogenic temperatures. It's recommended operating range is� -200� to 350�C (-330� to 660�F), but it can be used to -269�C (-452�F) (boiling helium).
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Type N Thermocouple (Nicrosil / Nisil)
Composed of a positive leg which is approximately 14% chromium, 1.4% Silicon and 84.6% Nickel, a negative leg which is approximately 4.4% Silicon, 95.6% Nickel.
This nickel-based thermocouple alloy is used primarily at high temperatures up to 1260�C (2300�F). While not a direct replacement for Type K, Type N provides better resistance to oxidation at high temperatures and longer life in applications where sulfur is present.
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Type B Thermocouple (Platinum / Rhodium)
Composed of a positive leg which is approximately 70% Platinum, 30% Rhodium and a negative leg which is approximately 94% Platinum, 6% Rhodium.
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Lorem ipsum dolor ed diam nonummy nibh euismod tincidunt ut laoreet dolore magna dolor ed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit m veniam volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit m veniam volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis.
Type S Thermocouple (Platinum / Rhodium)
Composed of a positive leg 90% platinum 10% Rhodium and a negative leg which is 100% Platinum.
Type S thermocouples can be continually at temperatures up to 1450�C. They can with stand short duration excursions up to 1650�C. They need protection from high temperature atmospheres to prevent metallic vapour ingress to the tip resulting in reduction of emf generated. Protection commonly offered is high purity recrystallised alumina sheath. For most industrial applications, thermocouples are housed in a thermowell.
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Type R Thermocouple (Platinum / Rhodium)
Composed of a positive leg which is 87% Platinum 13% Rhodium and a negative leg which is 100% Platinum.
Type R thermocouples cover similar applications as Type S but offers improved stability and a marginal increase in range. Consequently, Type R tend to be used in preference to Type S.
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Thermocouple Order Code
Sheath Material
304 = 304 S.S. Most commonly used low temperature sheath material. Good corrosion resistance. Subject to damaging carbide precipitation in the 900�F to 1600�F range. (482�C to 871�C)
316 = 316 S.S. Best corrosion resistance of the austenetic stainless steel grades. Good corrosion resistance in Hydrogen Sulfide. Subject to damaging carbide precipitation in the 900�F to 1600�F range. (482�C to 871�C)
310 = 310 S.S. Mechanical and corrosion resistance similar to but better than 304 S.S. Very good heat resistance. This alloy contains 25% Cr, 20% Ni. Not as ductile as 304 S.S.
INC = Inconel 600 Best corrosion resistance of the austenetic stainless steel grades. Good corrosion resistance in Hydrogen Sulfide. Subject to damaging carbide precipitation in the 900�F to 1600�F range. (482�C to 871�C)
Sheath Diameters
0.010"
0.020"
0.032"
0.040"
0.063"
0.313"
0.125"
0.375"
0.188"
0.500"
0.250"
Recommended upper temperature limits for sheath type thermocouples
| Type |
0.040" |
0.063" |
0.125" |
0.188" |
0.250" |
0.375" |
| J |
900 °F |
1000 °F |
1000 °F |
1200 °F |
1200 °F |
1200 °F |
| K |
1400 °F |
1800 °F |
1800 °F |
2000 °F |
2000 °F |
2000 °F |
| T |
300 °F |
400 °F |
400 °F |
700 °F |
700 °F |
700 °F |
| E |
800 °F |
1000 °F |
1000 °F |
1000 °F |
1100 °F |
1200 °F |
NOTE: The recommended temperatures shown are suggested maximum temperatures at which a thermocouple should yield satisfactory life. Due to the variables of each application, in certain instances the upper limit shown maybe exceeded without decreasing thermocouple life. Conversely, other applications may decrease service life if used at recommended upper limits. Consult our factory for suggested maximum temperatures for your requirements.
Thermocouple Grade Wire
Calibration
Type |
Temperature Range |
Tolerance Whichever is GREATER |
| J |
32 to 1382°F |
0 to 750°C |
� 2.2°C or � 0.75% |
� 1.1°C or � 0.4% |
| K |
32 to 2282°F |
0 to 1250°C |
� 2.2°C or � 0.75% |
� 1.1°C or � 0.4% |
| E |
32 to 1652°F |
0 to 900°C |
� 1.7°C or � 0.5% |
� 1.0°C or � o.4% |
| T |
32 to 662°F |
0 to 350°C |
� 1.0°C or � 0.75% |
� 0.5°C or � 0.4% |
| R or S |
32 to 2642°F |
0 to 1450°C |
� 1.5° or � 0.25% |
� 0.6°C or � 0.4% |
| B |
1598 to 3092°F
|
870 to 1700°C |
� 0.5% |
|
| N |
32 to 2282°F |
0 to 1250°C
|
� 2.2°C or � 0.75% |
� 1.1°C or � 0.4% |
Thermocouple Extension Grade Wire
Calibration
Type |
Temperature Range |
Tolerance Whichever is GREATER |
| JX |
32 to 392°F |
0 to 200°C |
� 2.2°C |
� 1.1°C |
| KX |
32 to 392°F |
0 to 200°C |
� 2.2°C |
� 1.1°C |
| EX |
32 to 392°F |
0 to 200°C |
� 1.7°C |
� 1.0°C |
| TX |
32 to 212°F |
0 to 200°C |
� 1.0°C |
� 0.5°C |
| NX |
32 to 392°F |
0 to 200°C |
� 2.2° |
� 1.1°C |
Junctions
G=Grounded
Has the fastest response time ideal for measuring rapid temperature changes. Clear coating on most models provides a humidity barrier for the thermocouple. Do not use with corrosive fluids or atmospheres. See table at right for recommended atmosphere type for exposed-junction probes.
U=Ungrounded
Has a welded junction insulated from the protective sheath and is electrically isolated. Longer response time; use for conductive solutions or where isolation of the measuring circuitry is required.
E=Exposed
Has a junction welded to tip of sheath. Wires are completely sealed from contaminants. Good response time
Immersion Length/ Sheath Length
Length of sheath is measure from the sensing junction to the beginning of the first fixed obstruction, termination or transition.
Leadwire
L1=Wire Exposed
L2= PVC Insulated Lead Wire (Rated 105°C, Epoxy Potted)
L3= Teflon Insulated Lead Wire (Rated 204°C, Epoxy Potted
L4= Fiberglass Insulated Lead Wire (Rated 204°C, Expoxy Potted)
L5= Fiberglass Insulated Lead Wire (Rated 510°C, Ceramic Cement Potted
CC= Coil Cord
Lead Length
Protective Coverings
SS = Stainless Steel Overbraid
TCTU = Tinned Copper Overbraid
FA* = Stainless Steel Flex Armor
TFA* = Teflon Coated Stainless Steel Flex Armor
PFA* = PVC Coated Stainless Steel Flex Armor
* Add Length to Armor Code. (Example: PFA24)
Terminations
P = Male Plug *(MP= Mini Plug)
J = Female Jack * (MJ= Mini Jack)
ASCH = Aluminum Screw Cover Head
PH = Plastic Screw Cover Head
MPH = Mini Plastic Screw Cover Head
MAH = Mini Aluminum Screw COver Head
EXH = Explosion Proof Head (USL,CSA)
HCH = Hinged Cover Head
HPH = High Profile Hinged Screw Cover Head
SL = Spade Lugs (#10 Screw Size)
BW = Bare Wire
Fixed Fitting
| FXS |
|
NPT |
| 1 |
= |
1/8" |
| 2 |
= |
1/4" |
| 3 |
= |
3/8" |
| 4 |
= |
1/2" |
| 5 |
= |
3/4" |
| 6 |
= |
1" |
| FXD |
|
Head/Process |
|
= |
1/8" x 1/8" |
| 2 |
= |
1/4" x 1/4" |
| 3 |
= |
1/2" x 3/8" |
| 4 |
= |
1/2" x 1/2" |
| 5 |
= |
3/4" x 3/4" |
Adjustable Fittings
| N.P.T |
|
I.D. |
|
S.S |
|
BRASS |
|
C.S. |
| 1/8" |
= |
1/16" |
= |
SSF2 |
= |
BF2 |
= |
SF2 |
| 1/8" |
= |
1/8" |
= |
SSF4 |
= |
BF4 |
= |
SF4 |
| 1/8" |
= |
3/16" |
= |
SSF7 |
= |
BF7 |
= |
SF7 |
| 1/4" |
= |
3/16" |
= |
SSF8 |
= |
BF8 |
= |
SF8 |
| 1/8" |
= |
1/4" |
= |
SSF9 |
= |
BF9 |
= |
SF9 |
| 1/4" |
= |
1/4" |
= |
SSF10 |
= |
BF10 |
= |
SF10 |
| 1/2" |
= |
1/4" |
= |
SSF11 |
= |
BF11 |
= |
SF11 |
Fixed Fitting
Thermocouple Order Code
Sheath Material
304 = 304 S.S. Most commonly used low temperature sheath material. Good corrosion resistance. Subject to damaging carbide precipitation in the 900�F to 1600�F range. (482�C to 871�C)
316 = 316 S.S. Best corrosion resistance of the austenetic stainless steel grades. Good corrosion resistance in Hydrogen Sulfide. Subject to damaging carbide precipitation in the 900�F to 1600�F range. (482�C to 871�C)
310 = 310 S.S. Mechanical and corrosion resistance similar to but better than 304 S.S. Very good heat resistance. This alloy contains 25% Cr, 20% Ni. Not as ductile as 304 S.S.
INC = Inconel 600 Best corrosion resistance of the austenetic stainless steel grades. Good corrosion resistance in Hydrogen Sulfide. Subject to damaging carbide precipitation in the 900�F to 1600�F range. (482�C to 871�C)
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