Excellent temperature stability and low thermal EMF
Mineral insulated RTD cable with Constantan conductors
Mineral insulated RTD cable with Constantan conductors is used for temperature measurement up to 650°C. Constantan is a copper-nickel alloy that provides stable resistance over a wide temperature range. Kamet supplies Constantan conductor MI RTD cable manufactured by Okazaki in various sheath materials, diameters and conductor configurations.
Constantan conductor MI RTD cable specifications
| Specification | Constantan conductor MI RTD cable |
|---|---|
| Conductor material | Constantan |
| Conductor alloy | Copper-nickel |
| Maximum stated measurement temperature | 650°C |
| Key properties | Temperature stability and low thermal EMF |
| Standard sheath materials* | AISI 316L, AISI 316Ti, AISI 321 and Inconel 600 |
| Available conductor pairs* | 2, 3, 4, 6 or 8, depending on configuration |
| Conductor spacing* | Normal or wide, depending on configuration |
| Manufacturer | Okazaki |
| Certificate | Material 3.1 certificate |
| Supply form | Coils or straight lengths |
| Standard wall thickness | Min. 10% of cable diameter |
| Minimum bending radius | 2× sheath diameter |
Why use Constantan conductors in MI RTD cable?
Constantan conductors are used in MI RTD cable because they provide stable resistance over a wide temperature range. Constantan is a copper-nickel alloy and combines excellent temperature stability with low thermal EMF. The Constantan conductor MI RTD cable supplied by Kamet is suitable for temperature measurements up to 650°C.
Available Constantan MI RTD cable sheath materials, diameters and conductor pairs
For the complete range of standard stock and custom made Constantan RTD cable possibilities, visit our overview page.
| Conductor | Sheath material | Stocked outer diameter (mm) | Pair | Spacing | In stock | |
|---|---|---|---|---|---|---|
| Constantan | AISI316L | OD between 3.00 and 8.00 | 3, 4, 6 | Standard and wide | Yes | Send an inquiry |
| Constantan | AISI310 | 6.00 mm | 4 | Standard | 18-week lead time | Send an inquiry |
How can we help you today?
Request a quotation for the mineral insulated RTD cable you need for your sensor.
Specifications of Okazaki Constantan conductor MI RTD cable
- By Japanese manufacturer Okazaki, made with Japanese and European sourced materials
- Supplied with a material 3.1 certificate
- Excellent temperature stability and low thermal EMF
- Good corrosion resistance, and mechanical robustness
- Available in coiled form, with an option for straight lengths, which may retain a natural curvature.
- The wall thickness is generally no less than 10% of the cable diameter.
- Can be bent around a mandrel with a radius twice the sheath diameter without compromising sheath integrity or insulation resistance.
- The sheath is compatible with welding, brazing, and soldering, preserving insulation resistance when standard care is applied for the metal type and thickness.
Constantan conductor MI RTD cable supplied by Kamet
- Standard cables available in stock for immediate shipment.
- Non-stock items have a delivery time of 10–18 weeks.
- Offered in full coils or custom lengths to meet your needs.
- Access our inventory and pricing anytime through our 24/7 digital customer portal.
- Expertise in international exports
AerOpak MI RTD cable specs – Reversed mounted
| OD (mm) | Tolerance (mm) | Wall thickness (mm) | Conductor diameter (mm) | Distance between wires (mm) | Resistance (Ω/m) | m/Coil |
|---|---|---|---|---|---|---|
| 9.00 | +/- 0.05 | 0.90 | 0.90 | 3.10 | 0.50 | 20 |
| 8.00 | +/- 0.05 | 0.80 | 0.80 | 2.70 | 0.50 | 25 |
| 6.40 | +/- 0.05 | 0.64 | 0.64 | 2.20 | 0.50 | 39 |
| 6.00 | +/- 0.05 | 0.60 | 0.55 | 2.08 | 0.50 | 45 |
| 4.80 | +/- 0.05 | 0.48 | 0.48 | 1.70 | 0.70 | 70 |
| 4.50 | +/- 0.05 | 0.45 | 0.40 | 1.65 | 0.70 | 80 |
| 3.20 | +/- 0.05 | 0.32 | 0.32 | 1.00 | 1.40 | 159 |
| 3.00 | +/- 0.05 | 0.30 | 0.26 | 1.00 | 1.40 | 181 |
AerOpak MI RTD cable specs – Top mounted
| OD (mm) | Tolerance (mm) | Wall thickness (mm) | Conductor diameter (mm) | Distance between wires (mm) | Resistance (Ω/m) | m/Coil |
|---|---|---|---|---|---|---|
| 12.70 | +/- 0.05 | 1.27 | 1.90 | 0.70 | 0.15 | 20 |
| 9.00 | +/- 0.05 | 0.90 | 1.35 | 0.70 | 0.20 | 40 |
| 8.00 | +/- 0.05 | 0.80 | 1.20 | 0.13 | 0.25 | 51 |
| 6.40 | +/- 0.05 | 0.64 | 0.96 | 0.16 | 0.35 | 80 |
| 6.00 | +/- 0.05 | 0.60 | 0.90 | 0.20 | 0.42 | 91 |
| 4.80 | +/- 0.05 | 0.48 | 0.74 | 0.28 | 0.65 | 142 |
| 4.50 | +/- 0.05 | 0.45 | 0.67 | 0.35 | 0.75 | 162 |
| 3.20 | +/- 0.05 | 0.32 | 0.48 | 0.50 | 1.47 | 166 |
| 3.00 | +/- 0.05 | 0.30 | 0.45 | 0.60 | 1.70 | 189 |
