Pasia Industries Ltd
PASIA INDUSTRIES LTD ————Leading MI Cable Heating
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Oxygen-Free Copper Conductor Mineral Insulated Coaxial Or Triaxial Signal Detecting Cable
Oxygen-free Copper Conductor Mineral Insulated Coaxial or Triaxial Signal Detecting Cable is with core conductor material of oxygen-free copper. Due to all materials used are inorganic materials, can undoubtedly work in high temperature state, up to 1200℃. At the same time, the radiation resistance of inorganic materials is greatly higher than that of any other known organic materials, so they are widely used in nuclear power engineering.
This kind of coaxial cable, triaxial cable with different insulation materials, possess different electrical properties accordingly which can be used in different environments.
The general structure of triaxial and coaxial cables is as follows:
Stainless steel sheath
exterior insulating layer
Interior insulation layer
Triaxial cable construction
Stainless steel
conductor
Pure copper shield
Insulation materials
Stainless steel sheath
Pure copper shield
Coaxial cable sheath material generally uses 300 series of stainless steel as sheath material and conductor material for core. According to different requirements, generally the cable will be composed of stainless steel (304L), oxygen-free copper, pure nickel wire and steel cladded copper (stainless steel cladded oxygen-free copper). Different wire core materials have no effect on the electrical properties.
Table 1:
| Name | Outside Diameter (mm) | Insulation Material | Line Capacitance(pF/m) | Insulation(Ω·m) | Withstand Voltage (DCV) |
| Coaxial cable | 3,4,6 | Al2O3 | 145 | ＞1013 | 3000/1min |
| Silicon oxide | 95 | ||||
| Magnesium oxide | 285 |
The conductor material of mineral insulated triaxial cable (conductor material) is generally of stainless steel (304L), oxygen-free copper, pure nickel wire and SS cladded copper (oxygen-free copper cladded with stainless steel) according to different requirements. The internal shielding material is commonly used: 316 stainless steel, copper lined stainless steel or oxygen-free copper.
Generally, the electrical performance requirements of triaxial cable are mainly between the conductor and the inner shield. Different application environments also have different requirements for capacitance and voltage resistance.
Table 2:
| Name | Outside Diameter (mm) | Insulation Material | Line Capacitance (PF /m) | Insulation (Ω·m) | Withstand Voltage (DCV) |
| Triaxial cable | 3,4,6 | alumina | ＞1012 | 3000/1min | |
| silica | |||||
| magnesia | |||||
| Internal Shield Diameter | Internal Insulating Material | Line Capacitance (PF /m) | Insulation (Ω·m) | Voltage Withstanding (DCV) | |
| 1.8,2.4,3.6 | Al2O3 | 160 | ＞1013 | 3000/1min | |
| Silicon oxide | 105 | ||||
| Magnesium oxide | 300 |
Specification Code for the Coaxial MI Cable
NMIT - 400-050
NMIST - 600/360-040
NMIT: armored mineral insulated coaxial cable
NMIST: Armored mineral insulated triaxial cable
400: outer diameter 4.00 mm
600/360: outer diameter 6.00mm, inner shielding diameter 3.6mm
D: high temperature
D: high temperature
050: conductor diameter 0.50mm
040: conductor diameter 0.50mm
E: Insulating material
E: Insulating material
L: alumina
L: alumina
S: silica
S: silica
M: magnesium oxide
M: magnesium oxide
Features
■ Optimised geometries to minimise surface transfer impedance
■ Designed to maintain screening performance of measurement chain
■ Very high insulation resistance to minimise signal losses
■ All cable supplied fully tested
■ Maximum operating temperature of 700 ºC in high neutron flux fields
■ Dimensions and lengths can be adapted to particular applications