Description
YOKOGAWA SAI143-H33
Technical Specifications Brand: Yokogawa Model: SAI143-H33 System Series: ProSafe-RS SIS Channel Count: 16 analog input channels Input Signal Range: 4 mA to 20 mA Channel Isolation: Module level galvanic isolation Dielectric Withstand Voltage: 1500 VAC between field side and system side for 1 minute Data Update Period: 40 ms Transmitter Power: Two-wire transmitter power supply switchable for all channels Redundancy Support: Dual redundant hot standby configuration Protection Grade: IP20 cabinet installation Operating Temperature: 0°C to +70°C Shipping Weight: 1.3 kg
Functional Features 16 channel 4-20mA signal acquisition for safety instrument system transmitters. Supply power to two-wire field pressure, temperature and level transmitters. Continuous channel diagnostics for wire break, short circuit and transmitter fault. Module level galvanic isolation protects SIS backplane from field surge and ground potential difference. Supports dual redundant hot standby operation, automatic switchover on module failure. HART communication relay function for HART smart transmitter parameter access. Front panel LED indicators show power, bus communication and individual channel fault.
Application Scenarios Chemical plant safety instrumented system, refinery SIS process measurement, oil and gas pipeline safety monitoring, power plant boiler protection, petrochemical furnace safety shutdown system.
Performance Parameters High precision analog sampling for safety critical measurement. Fast detection of field loop break and short circuit. Redundant module seamless switchover without data loss. Galvanic isolation blocks surge interference from field instrument loops. Compliant with IEC 61508 safety standard for safety instrumented systems.
Material Composition Front Panel: Flame retardant black ABS plastic with LED indicators. Main PCB: FR4 multilayer PCB with conformal coating for humidity and corrosion resistance. Core Components: High precision AD converter, isolation optocoupler, HART modem chip, bus communication processor. Backplane Connector: Gold plated edge connector. Terminal Block: Pressure clamp type terminal block for field wiring.
Structural Features Rack plug-in card form factor, rear gold finger connects to ProSafe-RS rack backplane. PCB layout separates field analog signal circuit and safety backplane bus circuit. Each analog channel has independent signal conditioning circuit. Side plastic latches for module insertion and extraction. Front panel LED array indicates module and channel health status.
Working Principle 4-20mA signals from field two-wire transmitters enter module terminal block. Signal passes through isolation and conditioning circuit before AD conversion to digital measurement value. Digital data transmits over backplane bus to ProSafe-RS safety controller. Module continuously monitors loop current, reports wire break or short circuit fault to SIS controller. In redundant configuration, two SAI143-H33 modules measure same signals, system selects valid measurement automatically when one module fails. HART modem relays HART command between smart transmitters and asset management station.
Installation Requirements Insert module into ProSafe-RS rack slot with power off and lock side latches. Use shielded twisted pair cable for 4-20mA instrument wiring with single point shield grounding. Separate instrument signal cables from high power cables. Configure channel parameters and perform loop calibration after installation. Install dedicated redundant terminal block when deploying dual redundant configuration. Reserve ventilation space inside rack for heat dissipation.
Usage Notes Do not connect voltage signal to 4-20mA current input terminals. Check terminal screw tightness periodically in vibration intensive plant areas. Wear anti-static wristband during module replacement. Re-calibrate analog channels after module swap. Keep cabinet interior dry to prevent PCB condensation leakage.
