BERTHOLD LB4460 Wiring Protection Enclosure

BERTHOLD LB4460 Wall-mounted Nuclear Radiation Measurement Instrument Wiring Protection Enclosure
I. Basic Product Information
Brand: Germany BERTHOLD
Model: LB4460
Product Type: Special wall-mounted protective junction box for nuclear level gauges / density meters. It is an outdoor / explosion-proof installation housing for the LB442 series signal evaluation host, used for connecting gamma ray detectors, on-site cable distribution, and signal isolation protection.

System Description
The LB4460 itself does not contain an operation motherboard. It is merely a protective wiring wall-mounted housing. An LB442 master/slave signal processing module is installed inside, and the entire set constitutes a γ-ray non-contact measurement system. It can achieve online monitoring of material level, interface, slurry density, and solid material flow.

Core Functions
Centralized protection and distribution of on-site cables
Multiple PG waterproof flange incoming lines, unified connection of detector pulse signals, 24V power supply, 4-20mA analog quantity, RS485 communication cables. The lines are neatly arranged, corrosion-resistant, moisture-proof, and dust-proof.
Explosion-proof safety protection (ATEX certification)
Explosion-proof grade: II 2G Ex ib IIC / IIB. It can be installed in hazardous zone 1 and 2 areas of chemical, petrochemical, and coal mines, etc. It has a built-in safety barrier circuit and is compatible with intrinsically safe radiation detectors.
Signal lightning protection and electrical isolation
Internal integrated signal isolation terminals suppress on-site surges and electromagnetic interference. Long-distance cable transmission supports a maximum distance of 1.8km (2.5mm² cable). This ensures stable transmission of weak radiation pulse signals.
Modular installation expansion
The box can simultaneously install up to 2 LB442 evaluation units to achieve dual detectors and multi-point radiation measurement. It supports a master-slave multi-detector networking measurement.

Key Electrical and Protective Parameters
Power supply: DC 18～32V (standard 24VDC), total machine power consumption ≤ 15W
Protection level: IP65, nylon flame-retardant explosion-proof housing
Operating temperature: 0℃～+40℃ (explosion-proof conditions); normal conditions – 20℃～+60℃
Storage temperature: -40℃～+70℃, no condensation environment
Cable transmission distance:
1mm² cable: maximum 750m
1.5mm² cable: maximum 1000m
2.5mm² cable: maximum 1800m
Installation method: Wall-mounted fixed installation, with a transparent lock扣 protective door. It allows for on-site viewing of module indicator lights and prevents unauthorized opening of the cover.
Dimensions： 280×220×120mm， the entire machine weighs approximately 2.5kg

Integrated Signal and Communication Configuration (with built-in LB442 module)
Signal input： NaI scintillation detector， ionization chamber detector pulse signals
Analog output： Two isolated 4～20mA (material level/density measurement values)
Digital communication： RS485 (Modbus RTU)， RS232 debugging port， supports HART protocol
Alarm output： Multiple relays for faults and over-limit alarms
Function algorithms： Automatic radioactive source decay compensation， temperature drift correction， multi-level filtering， measurement accuracy ±0.1% FS