The Mining Ex-RTD series manufactured by Reckmann GmbH (Germany) represents a specialized range of heavy-duty resistance temperature detectors engineered specifically for the extreme and dangerous environments of underground mining and subterranean excavation. The instruments are type-tested and certified according to rigorous international ATEX and IECEx standards specifically for Equipment Group I, Category M2 mines susceptible to firedamp (methane gas) and dense coal dust accumulations. Bearing the official explosion protection code I M2 Ex ia I Mb (in accordance with Ex operating instructions BWR15-C), these intrinsically safe "ia" sensors provide failsafe temperature monitoring without the risk of igniting explosive mine atmospheres.

This specialized mining series offers three tailored mechanical configurations:
1. Mining Ex-RTD Model 2: Configured with a Form 2 protective fitting without a neck tube and outfitted with a heavy-duty all-stainless steel connection head (VA head). This design provides unmatched mechanical impact resistance and shielding against acidic mine water corrosion. Process mounting is achieved via a welded retaining ring with a union nut or using a robust stainless steel (VA) compression fitting and clamping ring, ensuring permanent mechanical seating despite violent operational vibration.
2. Mining Ex-RTD Model 2G: An enhanced iteration of the Form 2 architecture, engineered with optimized environmental seals to endure severe subterranean conditions where high humidity, pulverized coal dust, and abrasive particulate matter are concurrently present.
3. Mining Ex-RTD Model 8 (2GoH): Features a direct-mounting Form 8 (2GoH without neck tube) configuration integrating an external screw-in spigot (preferred thread standard G1/2"). This low-profile threaded design allows flush screw-in installation directly into machine chassis, reduction gearboxes, motor casings, and pressurized hydraulic power packs of continuous miners and tunneling machinery without adding cumbersome external height.

Internally, the sensors feature high-precision Pt100 elements compliant with DIN EN 60751, encapsulated inside densely compacted Magnesium Oxide (MgO) mineral-insulated metal sheaths. This mineral-compaction architecture isolates the delicate platinum winding from severe mechanical shock waves generated by roadheaders and coal shearers, preventing thermal drift and guaranteeing long-term signal accuracy for mine safety control systems.

• Manufacturer: Reckmann GmbH
• Country of Origin: Germany
• Product Models Covered:
  - Mining Ex-RTD Model 2 (Form 2 without neck tube, stainless steel VA head, union nut or compression fitting)
  - Mining Ex-RTD Model 2G (Form 2G heavy-duty mining vibration-resistant construction, VA head)
  - Mining Ex-RTD Model 8 (2GoH) (Direct screw-in Form 8 without neck tube, standard thread G1/2")
• Explosion Proof Approvals: ATEX and IECEx type-tested for mines susceptible to firedamp
• Explosion Protection Code: I M2 Ex ia I Mb (Compliant with Ex operating instructions BWR15-C)
• Equipment Group / Category: Equipment Group I, Category M2 (Underground Mining)
• Sensing Resistor: High-accuracy Pt100 resistor per DIN EN 60751
• Wiring Circuit Configurations: 2-wire, 3-wire, or 4-wire (4-wire circuit strongly recommended for long cables)
• Accuracy Tolerance: Class B, Class A, or high-precision 1/3 DIN
• Mining Operating Temperature Range: -40°C to +150°C (Specifically optimized for mining machinery monitoring)
• Sheath & Head Material: Premium stainless steel AISI 316Ti (1.4571) or equivalent corrosion-resistant alloy
• Process Connections: Male thread G1/2", welded retaining ring with union nut, or VA sliding compression fitting
• Internal Core Structure: Replaceable mineral-insulated MgO core per DIN 43735 with high shock absorption
• Ingress Protection Rating: IP65 / IP67 (Depending on cable gland and terminal arrangement)