The Screw-in Resistance Temperature Detector (RTD) series manufactured by Reckmann GmbH (Germany) provides premium industrial instrumentation engineered with integrated male threaded process connections (screw-in spigots) for direct hermetic threading into pressurized pipelines and process vessels. This direct threaded mounting architecture delivers high static pressure containment and dependable seal integrity without requiring supplemental compression couplings, guaranteeing process safety in systems transporting aggressive, corrosive, or high-pressure thermal media.

The product line is categorized into four specialized models strictly conforming to DIN 43772 standards to resolve specific thermodynamic dissipation and spatial layout challenges:
1. Screw-in RTD Model 2G: Features a uniform straight cylindrical protection tube (Form 2G) combined with an extended neck tube (Halsrohr). The neck tube acts as a critical thermal buffer, dissipating intense process heat conducting upward from hot pipe walls before it reaches the industrial Form B terminal connection head. This safeguards the terminal connection block and head-mounted electronic transmitters (4-20mA / HART) against thermal degradation.
2. Screw-in RTD Model 3G: Synergizes an extended thermal neck tube with a precision stepped-down / tapered tip geometry (Form 3G). By minimizing the cross-sectional metal mass directly encasing the Pt100 platinum resistor, thermal inertia is dramatically curtailed, resulting in ultra-fast response kinetics (minimal t0.5 and t0.9 response times) while mitigating vortex-shedding vibrations in high-velocity fluid flows.
3. Screw-in RTD Model 3GoH: Features a stepped-down / tapered tip geometry Form 3G configured without an extended neck tube (oH = ohne Halsrohr / without neck tube). This reduced overall vertical profile is ideal for installation locations with tight spatial clearance or low overhead piping racks while preserving dynamic thermal response capabilities for rapid temperature swings at moderate temperatures.
4. Screw-in RTD Model 8 (2GoH): Built with a uniform straight cylindrical sheath Form 2 without a neck tube (Form 8 per DIN 43772 / 2GoH without neck tube). This model delivers maximum mechanical structural rigidity and the lowest mounting height, providing exceptional resistance against bending fatigue and shock loads from heavy industrial fluid momentum. It is ideal for direct flush threading into pump casings, machine blocks, gearboxes, and hydraulic power circuits.

The protective stems and threaded spigots are precision-machined from high-grade corrosion-resistant stainless steel alloys (AISI 316Ti / 1.4571 or AISI 316L / 1.4404). High-density Magnesium Oxide (MgO) mineral-insulated sensing inserts ensure complete immunity against mechanical shock, deliver outstanding electrical isolation, and maintain long-term signal fidelity across arduous process cycles.

• Manufacturer: Reckmann GmbH
• Country of Origin: Germany
• Product Models Covered:
  - Screw-in RTD Model 2G (Form 2G DIN 43772 straight tube with thermal neck tube)
  - Screw-in RTD Model 3G (Form 3G DIN 43772 stepped tip for rapid response, with thermal neck tube)
  - Screw-in RTD Model 3GoH (Form 3G DIN 43772 stepped tip, without neck tube oH, low-profile design)
  - Screw-in RTD Model 8 (2GoH) (Form 8 / 2GoH DIN 43772 straight tube, without neck tube oH, heavy-duty rigid)
• Sensing Resistor: High-purity Platinum RTD Pt100 or Pt1000 per DIN EN 60751
• Element Configuration: Simplex (1xPt100) or Duplex (2xPt100 for safety redundancy)
• Wiring Configurations: 2-wire, 3-wire, or 4-wire (4-wire circuit entirely eliminates lead resistance errors)
• Tolerance Accuracy Class: Class B (±0.3°C at 0°C), Class A (±0.15°C at 0°C), or high-precision 1/3 DIN
• Operating Temperature Range: -50°C to +400°C (Optionally extendable up to +600°C with mineral-insulated cores)
• Maximum Nominal Pressure: Up to 50 bar (Depending on medium temperature, velocity, and sheath dimensions)
• Mechanical Process Thread: Standard G 1/2" B male thread (Optional G 3/4", G 1", 1/2" NPT, 3/4" NPT)
• Neck Tube Length (Neck length): Standard 130 mm (or custom specified) for Models 2G and 3G
• Outer Sheath Diameters:
  - Model 2G & Model 8 (2GoH): Uniform straight Ø9 mm, Ø11 mm, or Ø12 mm
  - Model 3G & Model 3GoH: Main stem Ø9 mm or Ø11 mm, stepped down to Ø6 mm at the tip
• Immersion Lengths: 100 mm, 160 mm, 200 mm, 250 mm, 400 mm (Custom fabricated on request)
• Sheath & Thread Material: Premium stainless steel AISI 316Ti (1.4571) or AISI 316L (1.4404)
• Connection Head: Standard industrial Form B cast aluminum terminal head (Optional Form BUZ or stainless steel)
• Ingress Protection Rating: IP65 minimum (up to IP66 with torqued M20x1.5 cable glands)
• Transmitter Integration: Compatible with head-mounted puck transmitters providing 4-20mA output or HART protocol