Description
Metso AI8H D201189
Technical Specifications 8 galvanically isolated analog input channels; signal range 4-20mA; 16-bit analog-to-digital conversion; basic measurement accuracy ±0.15% full scale; isolation voltage 1500V AC between field side and system backplane; 24V DC auxiliary power supply; operating temperature -20°C to +70°C; IP20 protection.
Functional Features Samples analog current signals from field transmitters and converts them into digital engineering values. Detects loop break and short-circuit faults for each channel and sends fault alarms to the controller. Supports channel scaling configuration for different measurement units. Transmits measured values and diagnostic status to the rack controller via backplane bus. Provides overvoltage protection for field wiring terminals.
Application Scenarios Mineral crushing and grinding circuits, pulp mill digester control, ore flotation process monitoring, tailings pipeline flow measurement, mineral concentrate tank level monitoring.
Performance Parameters Low signal drift in dusty and high-vibration plant environments; high common-mode noise rejection; stable sampling rate for closed-loop control; continuous channel health monitoring.
Material Composition PCB substrate is FR-4 flame-retardant multilayer printed circuit board; analog conversion and signal conditioning chips are industrial wide-temperature semiconductors; isolation components adopt reinforced optocoupler circuits; backplane gold finger contacts use gold-plated copper alloy; module housing is flame-retardant thermoplastic resin; terminal contact springs use nickel-plated copper alloy.
Structural Characteristics Vertical plug-in rack module matching Metso control rack slots. Front panel includes power, communication and channel fault LED indicators. Rear gold finger connector provides power supply and backplane bus communication. Front terminal blocks accept field instrument wiring. Side mechanical latch locks the module firmly against cabinet vibration.
Working Principle 4-20mA current signals from field transmitters enter channel signal conditioning and isolation circuits. High-resolution analog-to-digital converters transform conditioned analog signals into digital raw data. The onboard microprocessor applies preset scaling formulas and uploads engineering values and fault information to the main controller over the backplane bus.
Installation Requirements Cut off rack power before module insertion or removal. Align the module with rack guide rails and push fully until the latch locks. Connect field transmitters to terminal blocks using shielded twisted-pair cables. Configure signal range and scaling parameters in Metso engineering software. Complete channel calibration and signal verification after power restoration.
Precautions for Use Do not apply voltage exceeding the rated isolation value to field terminals. Separate analog signal cables from high-current motor cables. Keep ventilation gaps free of dust and conductive debris. Execute anti-static protection when handling modules outside the rack.
