AEROPAK®Mineral Insulated Thermocouple

AEROPAK is a trademark of our metal sheathed thermocouples. AEROPAK, a sheathed thermocouple, is a thin tube (sheath) made of stainless steel or heat-resistant steel, thermocouple wires enclosed within the tube and inorganic insulator (MgO) firmly packed around the wires. We manufacture various products based on this structure according to purposes of use. In comparison to general protection tube type thermocouples, sheathed thermocouples have many excellent features.

AEROPAK®Mineral Insulated Thermocouple

Principle of Thermocouples

A thermocouple consists of two metal wires whose types differ from each other with both ends connected and when a temperature difference occurs at the contacts of both ends, thermo-electromotive force occurs and current flows within this closed circuit. The amount and the polarity of this thermo-electromotive force depend on the temperature of both ends and the combination of two metal wires and is not influenced by the thickness and length of the metal wires. Therefore, if you know the thermo-electromotive force at each temperature of specific thermocouples beforehand, you can measure the temperature.

Features

In comparison to conventional Protection Tube type thermocouples, AEROPAK has the following features.

  • 1.Wider Application Range

    Since the outer diameter is small, you can measure the temperature of small targets. In addition, since the structure is a sheath type, AEROPAK is high temperature/high pressure tolerant and can be used for a wide temperature range of -200 to 1,260℃.

  • 2.High Response

    Since a thermocouple with a smaller outer diameter has smaller heat capacity, AEROPAK sensitively responds to temperature changes.

  • 3.Easier Handling

    The minimum bend radius is two times larger than the sheath outer diameter. AEROPAK easily installed in various places at a site.

  • 4.Longer Product Life

    In comparison to conventional thermocouples, AEROPAK has a longer life since it is insulated and sealed with magnesium oxide which is stable chemically for thermo-electromotive force deterioration and accidents of disconnection, etc.

  • 5.Mechanical Strength/Pressure Resistance

    Selecting sheath materials allows safe use even in places with high vibration, corrosive atmosphere, high temperature and low temperature. Even a sheath with a small outer diameter allows approx. 350 MPa of pressure resistance strength at 650℃.

  • 6.Sheath Outer Diameter Manufacturing Available

    We can manufacture a sheath outer diameter of 0.08 to 22 mm.

  • 7.Sheath Length Manufacturing Available

    We can manufacture up to approx. 1,000 m depending on the sheath outer diameter.

  • 8.Special Needs Handling

    We can handle various needs with our factory dedicated to sheaths.

Standard Specification of AEROPAK®Mineral
Insulated Thermocouple JIS C1605
JIS C1605

Sheath(mm)

Core wire diameter(mm)

Thermocouple type and sheath material (representative example)

O.D. 外径 t Thickness SN SK SE SJ ST
Single element image

Single element

Φ0.08

10% or more of sheath outer diameter

10% or more of sheath outer diameter (4)

- B - - -
Φ0.1 B
Φ0.15
Φ0.25
B・SA
Φ0.5

15% or more of sheath outer diameter

C・B・SA C
Φ1.0 C・B・K C・B・K・SA

C

C
Φ1.6

C・B・K・SN

Φ3.2
Φ4.8
Φ6.4 D・B・K

D・B・K・SN

Φ8.0 D・B D・B・K・V・SN
Double element image

Double element

Φ1.6

10% or more of sheath outer diameter

15% or more of sheath outer diameter

C・B・K

C・B・K・SN

C

C C
Φ3.2
Φ4.8
Φ6.4 D・B・K

D・B・K・SN

Φ8.0 D・B D・B・K・V・SN
Triple element image

Triple element

Φ4.8

10% or more of sheath outer diameter

10% or more of sheath outer diameter (4)

C・B C・B C C C
Φ6.4 D・B D・B

Φ8.0

Sheath material: B = NCF600eq (1) C = 316SS D = 310SSS K = H2300 (2) V = Hastelloy-X SA = SC1000H (5) SN = SC1000N (5)

  • (1)

    NCF600eq is equivalent to Inconel 600.

  • (2)

    H2300® is a special sheath material for HOSKINS2300®.

  • (3)

    We can manufacture AEROPAK with sheath diameters and materials other than the above. Please contact us. (Example : 347SS, 321SS, 316LSS, etc)

  • (4)

    JIS is not applicable for sheath outer diameter of Φ0.25 or less.

  • (5)

    SC1000H and 1000N are supercouples for high temperature and the core wire diameter is 20% or more of the sheath outer diameter.

Maximum Manufacturing Length and Approx. Weight of AEROPAK®Mineral Insulated Thermocouple

Sheath outer diameter (mm) Φ0.08/Φ0.1 Φ0.15 Φ0.25 Φ0.5 Φ1.0 Φ1.6 Φ3.2 Φ4.8 Φ6.4 Φ8.0
Manufacturing maximum length (m) *1 *1 150 290 425 165 600 260 145 90
Approx. weight (g/m) 0.1以下 0.3 1.2 5 10 45 100 180 280

*1 Please contact us each time.

Types of Temperature Measuring Junction

Symbol Type Shape Features Sheath outer diameter applied (mm)
Single Double Triple
G
(♯8)
Ground Ground image
  • Pressure resistance of approx. 350 MPa or more.
  • Unsuitable for places with electromagnetic induction interference.
Φ0.5 to
Φ8.0
Φ1.6 to
Φ8.0
Φ4.8 to
Φ8.0
U
(♯9)
Non-ground Non-ground image
  • Used most commonly because of no limitation by measurement targets although the sensitivity is lower than the ground type.
  • Longer product life due to the element being covered by an insulator.
Φ0.08 to
Φ8.0
Φ1.6 to
Φ8.0
Φ4.8 to
Φ8.0
U
(♯5)
Non-ground/separation Non-ground/separation image
  • The temperature measuring junction is set for each pair of double elements and the circuit is separated from an indicator and a recorder.
  • The features are the same as the non-ground type.
- Φ3.2 to
Φ8.0
Φ4.8 to
Φ8.0
(♯6) Exposure Exposure image
  • The sensitivity is better because the element is exposed.
  • Suitable for measuring temperature of gas such as the exhaust gas of an engine.
  • Mechanically weaker than other temperature measuring junctions.
Φ1.0 to
Φ8.0
Φ3.2 to
Φ8.0
Φ4.8 to
Φ8.0

List of Thermocouple Allowance and Standards Applied by Each Country

S
t
a
n
d
a
r
d
T
y
p
e
JIS C1605 S
t
a
n
d
a
r
d
T
y
p
e
IEC 60584-2 ASTM E230
Temperature range C
l
a
s
s
Allowance
Temperature
range
C
l
a
s
s
Allowance
Temperature
range
C
l
a
s
s
Allowance
SN&
SK
-40℃ or higher and lower than +375℃ 1 ±1.5 N&K -40℃ or higher and lower than +375℃ 1 ±1.5 0℃ or higher and lower than +1,260℃ STD. ±2.2or
±0.75%
+375℃ or higher and lower than +1,000℃ ±0.004|t| +375℃ or higher and lower than +1,000℃ ±0.004|t|
-40℃ or higher and lower than +333℃ 2 ±2.5 -40℃ or higher and lower than +333℃ 2 ±2.5 SP. ±1.1or
±0.4%
+333℃ or higher and lower than +1,200℃ ±0.0075|t| +333℃ or higher and lower than +1,200℃ ±0.0075|t|
-167℃ or higher and lower than +40℃ 3 ±2.5 -167℃ or higher and lower than +40℃ 3 ±2.5 -200℃ or higher and lower than 0℃ STD. ±2.2or
±2%
-200℃ or higher and lower than -167℃ ±0.015|t| -200℃ or higher and lower than -167℃ ±0.015|t|
SE -40℃ or higher and lower than +375℃ 1 ±1.5 E -40℃ or higher and lower than +375℃ 1 ±1.5 0℃ or higher and lower than +870℃ STD. ±2.2or
±0.75%
+375℃ or higher and lower than +800℃ ±0.004|t| +375℃ or higher and lower than +800℃ ±0.004|t|
-40℃ or higher and lower than +333℃ 2 ±2.5 -40℃ or higher and lower than +333℃ 2 ±2.5 SP. ±1or
±0.4%
+333℃ or higher and lower than +900℃ ±0.0075|t| +333℃ or higher and lower than +900℃ ±0.0075|t|
-167℃ or higher and lower than +40℃ 3 ±2.5 -167℃ or higher and lower than +40℃ 3 ±2.5 -200℃ or higher and lower than 0℃ STD. ±2.2or
±2%
-200℃ or higher and lower than -167℃ ±0.015|t| -200℃ or higher and lower than -167℃ ±0.015|t|
SJ -40℃ or higher and lower than +375℃ 1 ±1.5 J -40℃ or higher and lower than +375℃ 1 ±1.5 0℃ or higher and lower than +760℃ STD. ±2.2or
±0.75%
+375℃ or higher and lower than +750℃ ±0.004|t| +375℃ or higher and lower than +750℃ ±0.004|t|
-40℃ or higher and lower than +333℃ 2 ±2.5 -40℃ or higher and lower than +333℃ 2 ±2.5 SP. ±1.1or
±0.4%
+333℃ or higher and lower than +750℃ ±0.0075|t| +333℃ or higher and lower than +750℃ ±0.0075|t|
ST -40℃ or higher and lower than +125℃ 1 ±0.5 T -40℃ or higher and lower than +125℃ 1 ±0.5 0℃ or higher and lower than +370℃ STD. ±1or
±0.75%
+125℃ or higher and lower than +350℃ ±0.004|t| +125℃ or higher and lower than +350℃ ±0.004|t|
-40℃ or higher and lower than +133℃ 2 ±1.0 -40℃ or higher and lower than +133℃ 2 ±1.0 SP. ±0.5or
±0.4%
+133℃ or higher and lower than +350℃ ±0.0075|t| +133℃ or higher and lower than +350℃ ±0.0075|t|
-67℃ or higher and lower than +40℃ 3 ±1.0 -67℃ or higher and lower than +40℃ 3 ±1.0 -200℃ or higher and lower than 0℃ STD. ±1or
±1.5%
-200℃ or higher and lower than -67℃ ±0.015|t| -200℃ or higher and lower than -67℃ ±0.015|t|
  • (1)

    The allowance is the allowable maximum limit of the value of temperature of thermo-electromotive force converted with the standard thermo-electromotive force table subtracting the temperature at the temperature measuring junction.

  • (2)

    The allowance of ASTM shall be a larger value of the % of either ℃ or the measured temperature.

  • (3)

    |t| is the measured temperature which is indicated with the temperature (℃) unrelated to + and - signs.

  • (4)

    Classes 1, 2 and 3 correspond to Classes 0.4, 0.75 and 1.5 of the old JIS.

  • (5)

    JIS, BS and DIN Standards are the same as the IEC Standard.

  • (6)

    ASTM Standard is the old ANSI Standard.

  • (7)

    The latest version is applied for the standard year.

Thermocouple Element
Configuration Material
JIS C1605

Symbol + leg - leg
SN(N) Alloy of mainly nickel, chrome and silicone Alloy of mainly nickel and silicone
SK(K) Alloy of mainly nickel and chrome Alloy of mainly nickel
SE(E) Alloy of mainly nickel and chrome Alloy of mainly copper and nickel
SJ(J) Iron Alloy of mainly copper and nickel
ST(T) Copper Alloy of mainly copper and nickel

Use Temperature Range (Atmospheric) Unit:℃

Symbol + leg SE SJ ST
Φ0.08 (*1)400
Φ0.1 (*1)400
Φ0.15 (*1)400
Φ0.25 (*1)500 (*4)700
Φ0.5 (*1)600 (*4)900
Φ1.0 650 (*3)1000
(*4)900
650 450 300
Φ1.6 650 (*3)1100
(*4)1000
(*5)800
650 450 300
Φ3.2 750 (*3)1200
(*4)1000
(*5)900
750 650 350
Φ4.8 800 (*3)1260
(*5)1050
800 750 350
Φ6.4 (*1)1000 (*2)800 (*3)1260
(*5)1050
800 750 350
Φ8.0 (*1)1050 (*2)900 (*3)1260
(*5)1050
800 750 350

(*1)The sheath material is NFC600eq. (*2)The sheath material is 310S SS. (*3)The sheath material is HOSKINS2300. (*4)The sheath material is SC1000H. (*5)The sheath material is SC1000N. For others, the sheath material is 316SS.

Basic Model

T35: Sheathed Thermocouple with Extension Lead Wire

Most basic model suitable for indoor usage.

Sheathed Thermocouple with Extension Lead Wire image

T110/R110: Temperature Sensor with a Push-pull Connector

Adopting the latching system greatly shortens time and the sensor shows true value in all fields with its robustness, lightness and safety.

Temperature Sensor with a Push-pull Connector image

T96N: Outdoor Type Sheathed Thermocouple

This type has a drip-proof type terminal box, suitable for usage in an outdoor general environment.

Outdoor Type Sheathed Thermocouple image

T97N: Pressure Resistant Explosion-proof Type Sheathed Thermocouple

This type is suitable for usage in dangerous places where explosive gas may occur such as petroleum refining/petrochemical plants. It is designed according to the structure standard d2G4.

Pressure Resistant Explosion-proof Type Sheathed Thermocouple image

T99N: Hydrogen Explosion-proof/Pressure Resistant Explosion-proof Type Sheathed Thermocouple

This type is suitable for usage in dangerous places where explosive gas especially that which includes hydrogen may occur such as petroleum refining/petrochemical plants. It is designed according to the technical standard ExdIICT6. We have explosion-proof products which support ATEX (CE Marking), FM (U.S.A.), FMC (Canada), NEPSI (China), KOSHA (Korea), TR CU (Russia), TR CU (Kazakhstan), TR CU (Belorussian), PESO (India) and OSHA (Taiwan). We have acquired many overseas explosion-proof certifications. Only for usage within Japan, a pressure-proof packing type connector must be attached.

Hydrogen Explosion-proof/Pressure Resistant Explosion-proof Type Sheathed Thermocouple image

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