AerOpak® Mineral Insulated Thermocouple Cable

AerOpak® is the trade mark for our mineral insulated cable and thermocouples made by Okazaki and ARi. The AerOpak® construction results in thermocouple wires that are surrounded by compacted mineral insulation (MgO) and contained in a sheath such as stainless steel or heat resistance steel. With our manufacturing capabilities, we can produce high quality AerOpak mineral insulated cable with outside sheath diameters from 0.010" to 0.750". Metric sizes, custom sizes, and heavy wall thickness cables are available on request.

General specifications

Outside Sheath Diameter

±0.002" (±0.05mm) or ±1% of nominal diameter, whichever is greater

Wall Thickness

±0.001" (±0.03mm) or 10% of nominal wire diameter, whichever is greater, 15% of sheath diameter as a minimum

Wire Diameter

±0.0015" (±0.04mm) or ±15% of nominal wall thickness, whichever is greater, 10% of sheath diameter as a minimum

Calibration

To meet special limits of error as defined in ASTM-E230 and IEC 60584-2

MgO Purity        

98% standard and +99.4% available on request

 

Partnumber breakdown

Symbol

(1)

-

(2)

(3)

-

(4)

(5)

(6)

Example

120

-

4

M

-

B

K

S

1. Sheath diameter
2. Number of wires
3. Insulation material
4. Sheath material
5. Thermocouple wire type
6. Tolerance class

 

1. Sheath diameter

Because we work closely with ARi in the USA and with Okazaki, we use a code that is based on the imperial system.
The code starts with the sheath diameter of the thermocouple cable. We have a large range of standard sizes in stock and we will gladly supply non-standard items.

Metric sizes (mm)

0.5

1.0

1.5

1.6

2.0

3.0

3.2

4.5

4.8

6.0

6.4

8.0

12.7

Standard diameters (inches)

020

040

060

062

079

120

125

177

188

236

250

313

500

With our manufacturing capabilities, we can produce high quality AerOpak® mineral insulated cable with outside sheath diameters from 0.004" (0.1mm) up to 0.750" (19 mm).
Custom sizes, and heavy wall thickness cables are available on request.

 

2. Number of conductors

Symbol

Number of  conductors

2

Single (for example: 1x type K)

4

Duplex

6

Triple

...

Other

 

3. Insulation material 

Insulation type

symbol

Recommended max. operating  temperature

Approx. melting temperature

Purity

Magnesium Oxide (MgO)

M

1700°C

2800°C

98% pure (Okazaki standard)

High Purity MgO

N

1700°C

2800°C

99.4% pure (ARi standard- available for all Okazaki cables on request)

 

4. Sheath Material

We have a large range of sheath materials available including the following: 

Sheath type

symbol

Recommended max. temperature

Melting temperature

Standard sheath diameters

AISI 304

A

900°C

1400°C

040, 060, 062, 079, 120, 125, 157, 177, 188, 236, 250, 313”

AISI 310

D

1090°C

1400°C

AISI 316

C

900°C

1370°C

AISI 321

E

1090°C

1350°C

AISI 347

F

900°C

1400°C

125, 236, 250 & 313"

AISI 446

AG

1090°C

1400°C

120, 188, 236, 313, 500”

Inconel 600

B

1175°C

1345°C

020, 031, 040, 060, 062, 079, 120, 125, 157, 177, 188, 236, 250, 313, 500”

Inconel 601

BM

1200°C

1345°C

079, 120, 236”

Pyrosil/ Nicrobell

PS

1250°C

1380°C

040, 060, 062, 079, 120, 125, 157, 177, 188, 236, 250, 313, 500”

Hastelloy x

V

1200°C

1260°C

120, 236, 313, 500”

Pt10%Rh

AH

1550°C

1850°C

040, 060, 062, 079 & 120”

Tantalum

N

2200°C

2995°C

On request

Alloy 825

BS

1200°C

1380°C

On request

* Haynes Alloy HR-160

HR-160

1200°C

-

On request

Many other dimensions are available on request

5. Thermocouple wire type 

Symbol

Thermocouple

Recommended max. temperature

Recommended environment

E

Cu-CuNi

850 °C

Oxidizing and reducing atmospheres

J

Fe-CuNi

750 °C

Oxidizing, reducing and vacuum atmospheres

K

NiCr-Ni

1200 °C

Oxidizing and inert atmospheres

N

NiCrSi-NiSi

1200 °C

Same general as type K, but more stable. Less affected by Sulfurous atmospheres because of the Silicon addition

T

Cu-Ni

350 °C

Oxidizing, reducing, inert or vacuum atmospheres

S

Pt10%Rh—Pt

1450°C


Oxidizing or inert atmospheres

R

Pt13%Rh—Pt

1450°C

B

Pt30%Rh—Pt6%Rh

870—1700°C

 * High-temperature corrosion resistance Alloys. Life extensions HR-160 greater than 10x compared to Ni-Cr Alloys and stainless steels are common.

 

6. Tolerance class

Symbol

Limits of error (tolerance)

S

Class 1 acording to IEC60584 or ASTM E230.
Standard AerOpak® cable will be supplied as IEC60584-2 Class 1

-

Class 2 (available on request)

The insulation Resistance (IR) test is a test required by the electrical safety testing standards. The insulation resistance test consists in measuring the insulation resistance of a device under test, while phase and neutral are short circuited together. A megohmmeter is used to measure the ohmic value of an insulator under a direct voltage of great stability. Insulation resistance of sheath thermocouple material, the electric shunting resistance between a pair. 

Insulation Resistance

OD of AerOpak (mm)

Characteristics

Ø 0.1 < O.D.? Ø 0.15

1 Megaohm /3 vDC

Ø 0.25 < O.D.? Ø 0.50

5 Megaohm/50 vDC

Ø 0.50 < O.D.? Ø 3.0

20 Megaohm/100 vDC

Ø 3.00  > O.D.

100 Megaohm/500 vDC

 

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