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Mineral Insulated Cables

Mineral Insulated Cables
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Mineral Insulated Cables

Product catalog summary
Company Overview
Tempsens Instruments (I) Pvt. Ltd., part of the Pyrotech Group, was established in 1976 and is a leading manufacturer of temperature sensors in India. The company is ISO 9001:2008 certified and has a NABL accredited lab, specializing in high-quality cables for temperature sensors and instrumentation.
Product Lines
Tempsens produces various mineral insulated (MI) cables, including Thermocouple MI Cables, RTD Extension MI Cables, Heater MI Cables, and Mineral Insulated Power Cables. These are designed for high-temperature applications in industries like atomic research, nuclear reactors, and kilns.
General Information on MI Cables
MI cables consist of conductors embedded in magnesium oxide insulation within a metal sheath, known for their mechanical, chemical, and electrical stability, flexibility, and high-temperature resistance.
Specifications and Standards
Thermocouple cables comply with ASTM and IEC standards for accurate EMF outputs, while RTD extension cables meet high-quality standards for optimal sensor performance.
Features of MI Cables
Key features include long life, rapid response, mechanical strength, corrosion resistance, radiation resistance, and safety. They are fire-proof and withstand high temperatures.
MI Thermocouple Cables
Available in types K, J, E, N, R, S, these cables meet international standards and are suitable for high-temperature applications with precise calibration.
MI Heater Cables
Robust and efficient, these cables are suitable for high-temperature and explosion-proof environments, used in power generation and petrochemicals.
MI RTD Cables
Featuring conductors made from copper, nickel, or nickel alloys, these cables are designed for high insulation resistance and durability.
MI Power Cables
Known for high current carrying capacity and resistance to fire and overloads, ideal for applications where conduit embedding is not feasible.
Testing and Compliance
MI cables undergo routine and type tests for compliance with international standards, including tests for conductor resistance, insulation integrity, and fire resistance.
Specifications
1. Electrolytic copper wire with a melting point of 1083°C.
2. Maximum continuous temperature of conductor: 250°C.
3. Heavy Duty Grade Cable with a voltage grade of 750V.
4. Applicable Standard: IEC/EN 60702 Part 1.
Types of MI Cables
1. Coaxial and Triaxial Cables: Triaxial cables offer greater bandwidth and interference rejection.
2. Self-Powered Neutron Detectors (SPND): Used in nuclear reactors, consisting of an inner electrode, insulation, and an outer electrode.
Raw Materials for MI Cables
1. Sheath Materials: Various stainless steels and Inconel alloys.
2. Insulation: Magnesium Oxide (MgO) with standard and high purity.
3. Conductors: Thermocouple conductors, pure nickel and copper wires, and special alloys.
Processing of MI Cables
1. Drawing of Sheath: Diameter reduction.
2. Sintering of MgO: Moisture removal by heating.
3. Annealing: Conducted in a multi-zone furnace.
4. Polishing: Ensures a clean surface.
Testing of MI Cables
1. Dimensional Tests: Sheath outer diameter, wall thickness, and conductor diameter.
2. Insulation Resistance Tests: At ambient and elevated temperatures.
3. Continuity and Loop Resistance Tests: Ensures electrical integrity.
4. Sheath Integrity Tests: Water, helium leak, dye penetrate, bend, and tension tests.
5. Thermal and Fire Resistance Tests: Conducted at specified temperatures.
6. Calibration: Auto calibration at three temperature points for thermocouple MI cables.
Packaging and Storage
1. Coils are sealed to prevent moisture ingress.
2. Stored in dry, dust-free environments.
3. Exposed ends must be sealed immediately after cutting to prevent moisture absorption.
See more

Catalog excerpts

Mineral Insulated Cables-1

o Thermocouple MI Cables o RTD Extension MI Cables o Heater MI Cables o Mineral Insulated Power Cable

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Mineral Insulated Cables-2

Tempsens Instruments (I) Pvt. Ltd. is a part of Pyrotech Group which was established by four technocrats in 1976 at Udaipur, with their first product as Thermocouples and RTDs. Today Tempsens is one of the largest manufacturers of Temperature Sensors in India. We are ISO 9001:2008 certified company with NABL accredited Lab.Tempsens Instruments (I) Pvt. Ltd. U # II was started in 2009 to produce quality cables with high standard of manufacturing process conforming to national & international specifications. We manufacturer wide range of cables for Temperature sensors and Instrumentation in various...

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Mineral Insulated Cables-3

BASICS OF MI CABLES GENERAL INFORMATION One or more wire like conductors (cores) are embedded in a high insulation quality MGO and pressed into a metal tube (sheath) made of oxidation and corrosion resistant material. The entire combination is then processed using suitable forming steps to obtain the final dimensions. In other words Mineral Insulated Cable, comprising a metal sheath in which the conductors are embedded in highly compressed magnesium oxide insulation. Metal Sheath Insulation (Magnesium Oxide) Mineral insulated cables are designed for high-temperature applications and used wherever...

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FEATURES Long Life : The construction of the cable guarantees a long conductor life because the sheath and the insulating material protect the conductors (wire) against environmental conditions such as corrosion and scaling . This ensures accurate calibration throughout the life of the cable. Long Lengths : Our unique manufacturing process results in lengths previously unheard of for mineral insulated cables. Rapid Response : The small mass and high thermal conductivity promotes rapid heat transfer from the heat source to measuring junction. Mechanical Strength : The Compact construction with...

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Mineral Insulated Cables-5

Mineral insulated thermocouple cables have inner conductors of Thermocouple base material as per standard ASTM E 585/585M and ASTM E 839. 60K600 : 6.0 mm OD, K Type, Simplex, Inconel 600 Sheath with high purity of MgO Insulation and accuracy class 1 as per specification IEC 584 64NN316 : 6.4 mm OD, N Type, Duplex, SS316L Sheath with high purity of MgO Insulation and accuracy class 1 as per specification IEC 584

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Tempsens Mineral Insulated Heating Cable is an electrical metal sheath heating cable with high economic efficiency (specific heating capacity up to 300 W/m). It is the most rugged and durable type of heating cable. Mineral Insulated Heating Cable is applicable for operation in high temperatures and explosion-proof areas. It can have a very high watt output and is used for process heating applications at temperatures where plastics insulated heating cables are not suitable. When properly installed, it has a very high lifetime. Mineral Insulated Heaters are applicable in the Machinery, power generating...

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Mineral Insulated Cables-8

Mineral insulated cables for RTDs have inner conductors of copper, copper-nickel alloys, nickel, nickel-chromium or nickel-plated copper. Sheath Nominal Wall Thickness (mm) Copper MgO (Standard Nickel Purity >97%) Alloy MgO (High Purity and others >99.4%) Ordering Example 80-4Cu316 RTD MI Cable : 8.60-6NiCu600 RTD MI Cable :Sheath 0 mm OD, 4 Cores, Copper Conductor, SS316L Sheath8.0 mm OD, 4 Cores, Nickel-Copper Alloy Conductor (Constantan), Inconel 600

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Mineral Insulated Cables-9

Mineral Insulated Copper cable belongs to electric cable class. Outer Sheath : Copper Sheath with melting point of 1083°C Insulation : Magnesium oxide insulator, hardly compressed, with melting point of 2800°C. Conductor: Annealed conductor of 99.9% of purity electrolytic copper wire, with melting point of 1083°C Applicable Standard : IEC/EN 60702 Part 1 • Maximum Continuous Temperature of Conductor is 250°C. • Heavy Duty Grade Cable : Voltage Grade 750V • Doesn't deteriorate with age. • Its high current carrying capacity. • Over come the overload and short circuit. • Working under fire condition...

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Mineral Insulated Cables-10

Triaxial cable is a type of electrical cable similar to coaxial cable, but with the addition of an extra layer of insulation and a second conducting sheath. It provides greater bandwidth and rejection of interference than coax, but is more expensive. SPND Self-Powered Neutron Detectors have been used effectively as in-core flux monitors for over twenty-five years in nuclear power reactors world-wide.The typical SPND is a coaxial cable consisting of an inner electrode (the emitter), surrounded by insulation and an outer electrode (the collector). CoUrcfer Imi.iI, Detector Section MI Cable SectionSELF...

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Values obtained from specification ASTM E 1652 1. Thermocouple Conductors (K, J, E, N, R, S, B, T Type) 2. Pure Nickel wire, Pure Copper Wire, Copper Nickel Alloy wire for RTD Extension Cable 3. Nichrome 80-20 wire, Nichrome 60-40 wire etc. for Heater MI cable 4. Pure copper Wire for MI copper Cable 5. Inconel 600, SS316L etc. for Coaxial and other special cables

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PROCESSING OF MINERAL INSULATED CABLES Sintering Of MgO Raw Mgo is hygroscopic, so it is to be sintered to remove the moisture contents from MgO. Then MgO is put inside the furnace at a temperature of 1280°C for around 5 hours. Annealing of MI cable in a furnace having five zones at different temperatures depending on material types & properties. Drawing Of Sheath with Raw Materials Reduce the diameter of MI cable step by step. Employing special equipments. Polishing has to be performed for better finish of surface and free from any foreign material. Horizontal Drawing Machine (Below 8m)

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All tests perform in house and as per standard.

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Storing in dry & dust free atmosphere with proper tagging. The magnesium oxide insulation is hygroscopic. To prevent moisture penetration, both ends are sealed. Under extreme conditions some moisture absorption could take place in spite of the sealing , so a dry place is desirable for storage. When pieces are cut from stock lengths, the exposed ends to be sealed at once. If at all Moisture has entered, this will lower the insulation resistance and may prove troublesome in welding. Moisture Penetration can be corrected by heating the sheath. Each coil is fitted with a temporary seal to prevent...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.
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