Manufacturer: ICS Triplex Part number: ICS Triplex T8153C
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T8153C: Product OverviewThe ICS Triplex T8153C is a triple modular redundant (TMR) analog input module designed for high-reliability safety instrumented systems requiring precise measurement of analog process variables. This module serves as the interface between analog field transmitters and the Trusted safety controller, providing fault-tolerant acquisition of 4-20mA signals from pressure, temperature, level, flow, and other process transmitters. The module implements a triple-redundant architecture where three independent input channels process each field signal, with median-select voting logic that compares results across all three channels to detect and compensate for potential failures while providing a single, validated process value to the controller.Installed in a Trusted system chassis, the module accepts 16 channels of 4-20mA analog inputs with support for HART digital communication protocol. Each input channel incorporates three completely independent signal conditioning paths including precision resistors, analog-to-digital converters, and isolation barriers. The voting logic uses median selection to determine the final process value, automatically ignoring outlying measurements that may indicate a developing channel fault. This design ensures that a single component failure in any part of the input circuitry does not cause a system failure or generate an invalid process value that could lead to a spurious trip or failure to act on a true demand.As a critical component of the Trusted safety platform, this analog input module supports the high availability and safety integrity levels required in critical process safety applications such as emergency shutdown systems and fire and gas systems. The module includes comprehensive diagnostics that monitor channel health, detect field wiring faults including open circuits and short circuits, and report module status to the system controller. The design emphasizes both hardware fault tolerance and advanced diagnostic coverage, providing the necessary features to achieve Safety Integrity Level (SIL) 3 certification according to IEC 61508 standards.
• Isolation: 1500V AC channel-to-channel and channel-to-system
• Common Mode Rejection: >120 dB at 60 Hz
• Normal Mode Rejection: >60 dB at 60 Hz
• Voting Logic: Median select with fault detection
• Diagnностика: Open circuit detection, short circuit detection, out-of-range detection
• Safety Integrity: SIL 3 capable per IEC 61508
• Operating Temperature: -40°C to +70°C
• Connection: Removable terminal blocks
• Status Indicators: Per-channel health and status LEDs
• Power Supply: 24V DC nominal (18-32V DC range)
• Power Consumption: 8W typical
ICS Triplex T8153C
Core Features & Customer ValueTriple Modular Redundant Analog Processing: The module’s TMR design provides three independent measurement paths for each analog input, with median-select voting that automatically disregards faulty readings while continuing to provide a valid process value. This architecture ensures continuous operation even with component failures in one or two channels, maintaining measurement integrity while alerting operators to the need for maintenance. For safety system applications, this redundancy provides the high availability necessary for critical protection systems while meeting the fault tolerance requirements for SIL 3 certification.HART Protocol Integration: The module supports HART digital communication superimposed on the 4-20mA analog signal, enabling access to secondary variables, device configuration, and diagnostic information from smart field devices without requiring separate wiring. This capability allows for advanced device management and predictive maintenance strategies while maintaining the safety integrity of the primary analog measurement. The HART communication occurs transparently without affecting the analog measurement integrity.Comprehensive Diagnostic Coverage: Advanced diagnostics monitor each input channel for field wiring faults including open circuits, short circuits, and signal integrity issues. The voting logic continuously compares the three independent measurements, detecting discrepancies that may indicate developing component failures. This diagnostic capability provides early warning of issues and supports predictive maintenance strategies. The high diagnostic coverage factor contributes to the module’s ability to achieve SIL 3 performance by detecting and reporting dangerous failures before they compromise the safety function.Typical ApplicationsIn emergency shutdown systems for refinery and petrochemical applications, the module interfaces with pressure transmitters, level transmitters, and temperature transmitters that monitor critical process conditions. The TMR architecture and median-select voting ensure reliable measurement of process variables even during component failures, preventing spurious trips while maintaining the ability to respond to true process demands.For fire and gas detection systems, the module connects to toxic gas detectors, combustible gas detectors, and smoke detectors that provide analog concentration signals. The high accuracy and diagnostic capabilities ensure reliable detection of hazardous conditions while minimizing false alarms that can disrupt operations.In turbine control and protection systems, the module monitors critical parameters including bearing temperatures, vibration levels, and speed signals. The robust design withstands the electrical noise typically present in power generation environments while maintaining accurate signal acquisition. The wide operating temperature range ensures reliable performance in both indoor and outdoor installations.
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