Mineral Insulated Thermocouple Cable (AerOpak®)


Thermocouple Cable 01

Thermocouple Cable 02


  • Special Limits Of Error As Defined in ASTM E-230
  • High Purity Magnesium Oxide (MgO) Inuslation 99.4% Pure

ARi is a manufacturer of mineral insulated cable (MI Cable) that are used for temperature sensor - Thermocouple (Type K, J, T, N, B, R, S, C) and RTD.  Aeropak® is a Thermocouple and Conductor wire in compacted ceramic insulation encased in a metallic sheath.  Simply put, because we manufacture our own MI Cable, ARi starts from a quality foundation few can match.  Custom designs, different signal wire configurations, assorted sheath materials and a wide variety of alloys are offered.

Our product line of AerOpak® Mineral Insulated cable can be used under the most severe conditions that can destroy other types of thermocouple cable. Based on our rugged construction and with a large variety of sheath materials available, AerOpak® cable can be used in corrosive conditions up to the maximum range of the materials selected.

Mineral Insulated Cable

Click to enlarge.

AerOpak® can be supplied in long lengths and can be formed or bent to a radius equal to twice the sheath diameter without loss of integrity. It can easily be welded or brazed to other metals when proper techniques are used.

Special non-destructive testing is available on in-process and finished thermocouple cable. Types of test available include Thermocouple Temperature Calibration, Radiography, Liquid Penetrant, Helium Leak, Dimensional, and Insulation Resistance. ARi standards are traceable to the National Institute of Standards and Technology (NIST).

With our manufacturing capabilities, we can produce high quality AerOpak mineral insulated cable with outside sheath diameters from 0.020″ to 0.750″. Metric sizes, custom sizes, and heavy wall thickness cable is available on request.


General Specifications

Outside Diameter Wall Thickness Wire Diameter Calibration
± 0.001 inch (± 0.025 mm) or 1% of nominal diameter, whichever is greater 10% of sheath diameter as a minimum 2 - Wires min. 15% of sheath O.D. Calibration tolerances ASTM-E230 and IEC584-1.
4 - Wires min. 12% of sheath O.D. Special tolerances per AMS2750D and BAC 5621K offered subject to availability. 
6 - Wires min. 9% of sheath O.D


Shipping Coil Sizes And Weight

Sheath O.D. Coil O.D. Approximate Weight at 100 ft (30.48 meters)
inch mm inch mm lbs kg
0.020 0.5 20-22 508-559 0.2 0.09
0.040 1.0 0.3 0.14
0.062 1.6 30 762 0.9 0.41
0.120 3.0 2.5 1.13
0.125 3.2 3.3 1.50
0.188 4.8 7.0 3.18
0.236 6.0 42 1067 10.8 4.90
0.250 6.4 12.3 5.58
0.313 8.0 19.5 8.85
0.375 9.5 27.0 12.25
0.500 12.7 42-48 1067-1220 50.0 22.68
0.625 15.9 Shipped straight , 20 ft maximum lengths Shipped straight , 6.1 meters maximum lengths 75.0 34.02
0.750 19.0 112.5 51.03


Please contact us for further information or any special requirements you may have.

Standard AerOpak® Mineral Insulated Cable is normally available from our inventory for immediate shipment. Call or email for details!

We want to hear from you:

800-237-6725 (Toll Free)

630-953-9100 (Phone)

630-953-0590 (Fax)