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Mineral insulated cables for RTDs have inner conductors of copper, copper-nickel alloys, nickel, nickel-chromium, or nickel-plated copper.

Sheath Diameter (mm)	Number of Core	Nominal Wall Thickness (mm)	Element Diameter (mm)	Insulation Resistance (MΏ)	Sheath Material	Conductor Type	Insulation
2.00	2 Core & 3 Core	≥ 0.20	≥ 0.30	≥ 100 MΏ	SS316L SS321 SS310 SS446 SS304 Inconel 600 Inconel 601 and others	Copper Nickel Nickel-Copper Alloy and others	MgO (Standard Purity ≥ 97%) MgO (High Purity ≥99.4%)
2.50		≥ 0.25	≥ 0.38
3.00		≥ 0.30	≥ 0.45
4.50		≥ 0.45	≥ 0.68
6.00		≥ 0.60	≥ 0.90
6.40		≥ 0.64	≥ 0.96
8.00		≥ 0.80	≥ 1.20
9.50		≥ 0.95	≥ 1.43
10.00		≥ 1.00	≥ 1.50

2.00	4 core	≥ 0.20	≥0.24	≥ 100 MΏ	SS316L SS321 SS310 SS446 SS304 Inconel 600 Inconel 601 and others	Copper Nickel Nickel-Copper Alloy and others	MgO (Standard Purity ≥ 97%) MgO (High Purity ≥99.4%)
2.50		≥ 0.25	≥ 0.30
3.00		≥ 0.30	≥0.36
4.50		≥ 0.45	≥ 0.54
6.00		≥ 0.60	≥ 0.72
6.40		≥ 0.64	≥ 0.77
8.00		≥ 0.80	≥0.96
9.50		≥ 0.95	≥ 1.14
10.00		≥ 1.00	≥ 1.20

3.00	6 core	≥ 0.30	≥ 0.30	≥ 100 MΏ	SS316L SS321 SS310 SS446 SS304 Inconel 600 Inconel 601 and others	Copper Nickel Nickel-Copper Alloy and others	MgO (Standard Purity ≥ 97%) MgO (High Purity ≥99.4%)
4.50		≥ 0.45	≥ 0.45
6.00		≥ 0.60	≥ 0.60
6.40		≥ 0.64	≥ 0.64
8.00		≥ 0.80	≥ 0.80
9.50		≥ 0.95	≥ 0.95
10.00		≥ 1.00	≥ 1.00

6.00	8 core	≥ 0.60	≥ 0.60	≥ 100 MΏ	SS316L SS321 SS310 SS446 SS304 Inconel 600 Inconel 601 and others	Copper Nickel Nickel-Copper Alloy and others	MgO (Standard Purity ≥ 97%) MgO (High Purity ≥99.4%)
6.40		≥ 0.64	≥ 0.64
8.00		≥ 0.80	≥ 0.80
9.50		≥ 0.95	≥ 0.95
10.00		≥ 1.00	≥ 1.00

Ordering Example

80-4Cu316 RTD MI Cable: 8.0 mm OD, 4 Cores, Copper Conductor, SS316L Sheath

60-6NiCu600 RTD MI Cable: 8.0 mm OD, 4 Cores, Nickel-Copper Alloy Conductor (Constantan), Inconel 600 Sheath.

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