Description
BERTHOLD LB444
Technical Specifications Input detector pulse signal; Digital signal processing; Analog output 4-20mA; Relay alarm outputs; RS485 fieldbus communication; Backlit LCD display; DIN rail or panel mounting; Protection class IP20 for electronic unit.
Functional Features Pulse signal acquisition and digital filtering for radiation detector; Calculate level, density or mass flow measurement value automatically; 4-20mA analog output transmits measured value to PLC/SCADA; Configurable relay high/low limit alarm; Built-in detector fault diagnosis; Parameter setting via front panel keys; Non-volatile memory stores calibration curve; Historical event and alarm storage.
Application Scenarios Cement kiln raw material level measurement; Mining slurry density monitoring; Chemical high viscosity medium level detection; Power plant ash silo level measurement; Bulk material non-contact radiometric measurement.
Performance Parameters Operating ambient temperature -20℃ to +60℃; Storage temperature -40℃ to +85℃; Relative humidity 5% to 95%, no condensation; Measurement linearity better than 0.5% full scale.
Material Composition Flame-retardant plastic housing; Multi-layer PCB digital signal processing board; High-speed pulse counting circuit; Microprocessor chip; LCD backlit display; Electromechanical alarm relays; Brass nickel-plated terminal blocks.
Structural Characteristics Compact rectangular housing; Front panel with LCD screen and operation buttons; Upper and lower terminal blocks for detector wiring, power supply and signal output; Internal isolation between detector high-speed pulse circuit and analog output circuit.
Working Principle Radioactive source emits gamma ray, ray intensity attenuates after passing through measured medium. Detector converts residual ray into pulse signal. LB444 unit counts pulse frequency and calculates attenuation degree, converts attenuation data into material level or density value according to pre-calibrated curve. The measured value outputs via analog channel, and limit value triggers relay alarm.
Installation Requirements Mount LB444 unit in safe control cabinet with standard DIN rail. Use shielded twisted pair cable to connect detector sensor, separate from power cable. Complete cabinet protective earthing. Set measurement range and calibration parameters after power-on. Execute zero and span calibration according to field medium condition.
Usage Notes Follow local radioactive safety regulations for the whole radiometric system. Do not open detector and radioactive source assembly. Conduct periodic calibration and safety inspection. Do not replace internal measuring components arbitrarily. Keep measuring cable away from strong electromagnetic interference source.
