ICS Triplex T9902 | TMR Analog Input Module
ICS Triplex T9902 | TMR Analog Input Module - Image 2
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ICS Triplex T9902 | TMR Analog Input Module

  • Brand:​ ICS Triplex
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    Model:​ T9902
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    Product Type:​ TMR Analog Input Module
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    Series:​ Trusted System
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    Core Function:​ Provides 16 channels of triple redundant 4-20mA analog input for safety instrumented systems.
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    Key Specs:​ 16 channels, 4-20mA input, TMR architecture, HART protocol support.
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Part number: ICS Triplex T9902
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Description

T9902: Product Overview
The ICS Triplex T9902 is a triple modular redundant (TMR) analog input module designed for high-integrity safety instrumented systems within the Trusted platform. This module functions as the primary interface for analog process variables, providing fault-tolerant acquisition of 4-20mA signals from transmitters measuring pressure, temperature, level, flow, and other critical process parameters. The module implements a robust architecture where three independent input channels process each field signal, with median-select voting logic that compares results to detect and compensate for potential failures while providing a single, validated process value to the safety controller.
Installed in a Trusted system chassis, the module accepts 16 channels of 4-20mA analog inputs with integrated support for the HART digital communication protocol. Each input channel incorporates three completely independent signal conditioning paths, including precision analog-to-digital converters and isolation barriers. The voting logic uses median selection to determine the final process value, automatically disregarding 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 an inappropriate safety action.
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. The design 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 combination of hardware fault tolerance and advanced diagnostic coverage provides the necessary features to achieve Safety Integrity Level (SIL) 3 certification according to IEC 61508 standards.

T9902: Technical Specifications
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    Model Number:​ T9902
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    Manufacturer:​ ICS Triplex
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    Product Type:​ TMR Analog Input Module
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    Number of Channels:​ 16 channels
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    Input Type:​ 4-20mA analog current loop
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    Signal Range:​ 0-24mA usable range
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    Resolution:​ 16-bit
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    Accuracy:​ ±0.05% of span
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    Update Rate:​ 100ms per channel
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    Input Impedance:​ 250 ohms
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    HART Support:​ Yes, digital communication superimposed on analog signal
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    Common Mode Rejection:​ >120 dB at 60 Hz
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    Normal Mode Rejection:​ >60 dB at 60 Hz
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    Isolation:​ 1500V AC channel-to-channel and channel-to-system
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    Voting Logic:​ Median select with fault detection
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    Diagnostics:​ Open circuit detection, short circuit detection, out-of-range detection
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    Safety Integrity:​ SIL 3 capable per IEC 61508
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    Operating Temperature:​ -40°C to +70°C
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    Connection:​ Removable terminal blocks
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    Status Indicators:​ Per-channel health and status LEDs
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    Power Supply:​ 24V DC nominal (18-32V DC range)

Core Features & Customer Value
Triple Modular Redundant Analog Processing: The TMR design provides three independent measurement paths for each analog input, with median-select voting that automatically ignores 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 maintenance needs. For safety system applications, this redundancy provides the high availability necessary for critical protection systems while meeting SIL 3 requirements.
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. 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 or the module’s safety certification.
High-Resolution Measurement: The 16-bit resolution provides 65,536 discrete measurement steps, enabling detection of very small process changes. This high resolution allows for more precise monitoring and earlier detection of developing process deviations, which is particularly valuable for applications involving slow-moving processes or requiring high measurement accuracy. The improved measurement granularity supports more accurate process oversight and earlier intervention.
Typical Applications
In 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 and combustible gas detectors that provide analog concentration signals. The high accuracy and diagnostic capabilities ensure reliable detection of hazardous conditions while minimizing false alarms. The fast update rate supports rapid system response to developing hazardous conditions.
In turbine control and protection systems, the module monitors critical parameters including bearing temperatures and pressure signals. The robust design withstands electrical noise typically present in power generation environments while maintaining accurate signal acquisition. The wide operating temperature range ensures reliable performance in both control room and field environments.
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