The Reckmann GmbH Model RTD 2 x PT100 4-wire Ø4.5 is an advanced industrial temperature sensing instrument engineered and manufactured in Germany for demanding process environments. At the heart of this sensor is its dual "2 x PT100" (Duplex Platinum Elements) architecture. Encapsulating two completely independent Pt100 platinum resistor elements within a single protective sheath provides critical process redundancy and system integrity. This allows process engineers to simultaneously route one signal to the primary DCS/PLC controller for continuous temperature regulation while feeding the second signal to an independent data logger, circular recorder, or emergency Safety Instrumented System (SIS). In the event that one channel is compromised, process monitoring continues uninterrupted, eliminating costly plant shutdowns.

Engineered with an advanced 4-wire circuit topology conforming strictly to DIN EN 60751, the sensor completely eliminates lead-wire resistance interference as well as ambient thermal drift along the extension cabling. This guarantees lab-grade measurement fidelity, even when signal runs span tens or hundreds of meters between the installation point and the central control console.

The slender outer sheath diameter of Ø4.5 mm provides an optimal thermodynamic compromise between rapid response kinetics (exceptionally low thermal inertia) and mechanical stability. Fabricated using high-density Mineral-Insulated (MgO) sheathing encapsulated in premium corrosion-resistant stainless steel, the probe remains flexible enough to be contoured into constrained spatial envelopes without risking lead fracture. The robust mineral compaction protects the internal platinum coils against violent vibration, cyclic pressure pulses, and mechanical shocks, making it the ideal instrumentation choice for heavy turbine bearing shells, high-power motors, heat exchangers, pressurized chemical lines, and metallurgical thermal chambers.

• Manufacturer: Reckmann GmbH
• Country of Origin: Germany
• Full Product Model: RTD 2 x PT100 4-wire Ø4.5
• Product Category: Industrial Duplex Mineral-Insulated Resistance Temperature Detector (RTD)
• Sensing Element: 2 x Pt100 (Duplex independent platinum elements) per DIN EN 60751
• Wiring Topology: 4-wire circuit configuration for absolute elimination of lead resistance errors
• Outer Sheath Diameter: Ø4.5 mm
• Tolerance Accuracy Class: Class A (±0.15°C at 0°C) or Class B (±0.3°C at 0°C)
• Standard Temperature Range: -50°C to +400°C (Optionally extendable up to +600°C upon request)
• Sheath Material: Stainless steel AISI 316Ti (1.4571) or AISI 316L (1.4404) for optimal corrosion resistance
• Internal Insulation: Densely packed high-purity magnesium oxide (MgO) powder for high vibration immunity
• Bendability: Minimum bending radius of 5 x sheath diameter (excluding the front 50 mm tip zone)
• Immersion Length: Available in standard industrial lengths or fully customized per engineering requirements
• Insulation Resistance: > 100 MΩ at 500V DC (tested at 25°C ambient temperature)
• Ingress Protection: IP65 / IP67 minimum depending on the selected terminal head or cable termination