The Berthold 48452-01 Radiometric Mould Level Detector (engineering specification: Berthold LB 6739-01 CsI 40/50, without water cooling) is an integral component of the world-renowned GAMMAcast system developed by Berthold Technologies GmbH & Co. KG (Germany). Specifically engineered for the global steelmaking sector, this radiometric scintillation detector represents the cutting-edge standard in non-contact continuous casting mould level control (MLC) across slab, bloom, and billet continuous casting machines (CCM).

The measurement operates on the proven gamma radiation transmission principle. A shielded radioactive isotope (Co-60 or Cs-137) positioned on one side of the crystallizer mould transmits a narrow collimated beam through the copper mould walls and the molten steel. The Berthold 48452-01 detector, mounted directly opposite the source, captures the unattenuated radiation flux. As the meniscus level of liquid steel fluctuates, the detected radiation intensity varies inversely. At the core of the detector is a premium Caesium Iodide (CsI) scintillation crystal with dimensions of Ø40/50 mm, coupled to an ultra-sensitive Photomultiplier Tube (PMT). The superior quantum conversion efficiency and gamma-ray stopping power of the CsI crystal over conventional NaI detectors allows the system to achieve razor-sharp measurement resolution with millisecond response kinetics while using significantly lower source activities—enhancing radiation safety across plant operations.

This specific LB 6739-01 (48452-01) model is engineered in an uncooled configuration ("without water cooling"). Utilizing a thermally insulated, sealed stainless steel housing and high-temperature electronic components, it thrives in well-ventilated casting environments without requiring dedicated chilled cooling water supply lines. Eliminating cooling water circuits near molten steel pools removes the catastrophic danger of explosive steam eruptions from hose failures, simplifies mechanical rigging around the tight oscillator table, and drastically cuts maintenance overhead.

The Berthold 48452-01 detector continuously feeds high-speed pulse rate counts to Berthold evaluation units (such as GAMMAcast LB 452) or directly into the plant-wide PLC/DCS governing tundish stopper rods or sliding gate actuators. With integrated drift stabilization and automatic radioactive decay compensation algorithms, the sensor guarantees unfaltering accuracy over decades, eliminating mold overflows and breakout incidents while facilitating higher casting speeds and pristine metallurgical steel quality.

• Manufacturer: Berthold Technologies GmbH & Co. KG
• Country of Origin: Germany (EU)
• Part Number / Order Code: Berthold 48452-01
• Model Specification: Berthold LB 6739-01 CsI 40/50, without water cooling
• Commercial Product Name: Berthold 48452-01 GAMMAcast Radiometric Mould Level Detector
• Measuring Principle: Non-contact Radiometric Gamma Ray Attenuation
• Compatible Radiation Sources: Cobalt-60 (Co-60) or Caesium-137 (Cs-137)
• Scintillation Detector Type: Caesium Iodide (CsI) High-Sensitivity Crystal
• Crystal Dimensions: Diameter Ø40 mm, Length 50 mm (CsI 40/50)
• Cooling Execution: Without water cooling (Ambient air dissipation with thermally insulated casing)
• Photoelectric Conversion: High-stability Photomultiplier Tube (PMT) with integrated high-voltage supply
• Dynamic Response: Fast response time in the millisecond range for real-time closed-loop stopper control
• Output Signal: High-frequency digital pulse rate signal via interference-shielded transmission
• Compatible Evaluation Units: Berthold GAMMAcast LB 452 / LB 352 moulding level controllers
• Housing Construction: Heavy-duty industrial stainless steel (AISI grade)
• Mechanical Shock & Vibration: Resistant to severe continuous casting oscillation vibrations
• Operating Ambient Temperature: -20°C to +60°C (with appropriate radiant heat shielding)
• Ingress Protection Rating: IP65 / IP66 rugged industrial standard
• Primary Target Applications: Continuous Casting Machines (CCM) for billets, blooms, beam blanks, and slabs