Technical Specifications Number of Input Channels: 8 isolated RTD input channels Supported Sensor Type: Pt100 platinum resistance temperature detector, support three‑wire connection mode Measurement Range: -200 °C to +850 °C Conversion Resolution: 16‑bit Measurement Accuracy: Less than 0.2 °C full‑scale error Channel‑to‑backplane Isolation Voltage: 2500 V RMS Backplane Communication: Tricon TriBus redundant backplane bus Operating Temperature: -40 °C to +70 °C Storage Temperature: -50 °C to +85 °C Certifications: SIL3, IEC61508, ATEX, UL, TÜV Module Dimension: Single‑slot Tricon rack plug‑in module Weight: 0.50 kg
Functional Features Triple‑modular redundant signal‑measurement circuit for each RTD channel. Support three‑wire RTD sensor connection to eliminate wiring‑resistance measurement error. Hardware electrical isolation for every input channel. Detect field‑sensor wire break and short‑circuit fault for each channel. Support hot‑swap online module replacement without system shutdown. Built‑in comprehensive self‑diagnosis for module hardware and field‑sensor‑loop status. Front‑panel LED indicators for module pass, fault and channel‑activity status. Sensor‑type and measurement‑range configurable via TriStation software.
Application Scenarios Safety‑related temperature‑signal acquisition for petrochemical plant SIS system. Reactor and furnace over‑temperature‑protection interlock‑signal measurement in chemical‑plant. Power‑plant boiler, turbine bearing temperature safety‑monitoring input. Oil‑gas compressor unit safety‑temperature‑detection signal collection. Refinery heater‑tube over‑temperature‑protection interlock‑system. High‑risk process‑industry thermal‑safety‑interlock‑loop temperature‑measurement.
Performance Parameters Voting Mode: Two‑out‑of‑three voting for three‑branch resistance‑sampling results Wire‑fault Diagnosis: Reliably detect RTD sensor open‑wire and short‑circuit fault Compensation Function: Three‑wire connection algorithm compensates field cable resistance impact Measurement Stability: Maintain stable temperature‑reading under full rated operating‑temperature range
Material Composition Circuit substrate: Conformal‑coated industrial printed circuit board. Module frame: Reinforced metal alloy rack‑insertion bracket. Connector components: Gold‑plated backplane golden finger and termination‑panel interface connectors. Internal components: Precision constant‑current source circuits, resistance‑sampling chips, isolation optocouplers, reference‑precision resistors. Fasteners: Anti‑vibration metal locking screws.
Structural Characteristics Single‑slot plug‑in structure matching Tricon standard rack chassis. Front‑panel LED indicator array showing module health and channel working‑state. Field RTD sensor wiring completes through external termination panel. Backplane golden finger interface for TriBus redundant backplane‑bus connection. Internal integrated electromagnetic‑shielding structure. Mechanical locking buckle prevents module displacement under cabinet vibration environment.
Working Principle Module provides constant‑excitation current for field three‑wire Pt100 RTD sensor. Resistance value of RTD sensor changes along with measured‑object temperature. Three‑wire sampling circuit eliminates measurement error caused by field cable resistance. Isolation optocoupler realizes electrical isolation between field‑sensor side and internal logic circuit. Three redundant measurement branches sample resistance value independently. Internal voting circuit implements two‑out‑of‑three voting for three‑branch sampling data and converts resistance value into actual‑temperature digital value. Valid temperature‑data transmits to main processor via TriBus backplane bus. Diagnostic circuit monitors resistance‑value variation range continuously, triggers fault alarm when detecting sensor wire break or short‑circuit and uploads fault‑information to system main‑controller.
Installation Requirements Install RTD input module into designated I/O slot of Tricon rack chassis. Carry out chassis protective‑grounding strictly complying with official grounding‑specification. Field RTD sensor shall use three‑wire shielded twisted‑pair cables. Separate temperature‑signal cables and high‑voltage power‑cable routing. Verify field‑sensor wiring sequence conforms to three‑wire RTD connection requirement. Hot‑swap replacement must follow site safety‑operation procedure. Control‑cabinet ambient temperature and humidity stay within rated scope without condensation. Termination‑panel wiring‑screw torque conforms to manufacturer recommended‑value.
Usage Notes Do not connect voltage‑signal sources onto RTD‑input terminals. Field sensor cable resistance shall not exceed maximum permissible cable resistance specified in manual. Periodically calibrate measurement‑channel accuracy in plant safety‑maintenance cycle. All sensor‑type and range‑configuration must download via TriStation engineering‑software. Prohibit on‑site disassembly of module; return defective module to authorized‑maintenance‑center. Avoid mechanical shock and strong vibration in transportation and installation process. Observe strict bypass‑management rules during module commissioning and maintenance work.
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