Mineral Insulated RTD
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Mineral-Insulated RTD's Endure High Temperature and Vibration

Minco has recently introduced a series of RTD's built with a super-stable platinum element packed in high-density mineral (MgO) insulation. This construction can withstand extremes of temperature and vibration that would destory ordinary RTD's.

The new RTD's are available with Inconel (650°C) or stainless steel (550°C) cases in diameters of 0.188" (4.8 mm), 0.236" (6.0 mm), and 0.250" (6.4 mm). Elements are 100 ohm platinum meeting IEC 751, Class A (±0.06%) or Class B (0.12%).

Minco first developed the RTD's to help turbine manufacturers more accurately measure efficiency. Traditional thermcouples installed in steam lines would drift over time, while many ordinary RTD's would fail after prolonged exposure to vibration. Comparison tests of Minco's mineral-insulated RTD's showed both superior temperature stability and ruggedness.

Minco also manufactures RTD probes capable of 850°C operation.

High Stability RTD's Measure From -200°C to 850°C

A new line of resistance temperature detector probes has less than 0.05°C drift (typical) after more than 250 hours at 850°C. Comparably rated probes from other RTD manufacturers drifted up to 10°C and more when tested at 850°C. A special nickel alloy sheath prevents contamination of the 100 ohm platinum elements and brings the performance and precision of RTD's to applications which until now would have required less-accurate thermocouple sensors.

Inside these new probes is a 100 ohm platinum element, manufactured by Minco using platinum wire in a configuration that is practically strain-free. The RTD probes accurately sense over the full range of the international specification IEC 751: 200 to 850°C. Ice point tolerance is either IEC 751 Class A (±0.15°C sat 0°C) or Class B (±0.30°C).

The probes meet IEC 751 shock and vibration specifications, making them suitable for duty in harsh industrial environments.

Five probe diameters are available: 0.188", 0.250", 4 mm, 5 mm, and 6 mm. Leadwire options include bare wire, mica/glass- or Teflon-insulated.

Fittings, connection heads, and 4 to 20 mA transmitters are available as accessories.