ICS Triplex T3431-IM
ICS Triplex T3431-IM
ICS Triplex T3431-IM
ICS Triplex T3431-IM

ICS Triplex T3431-IM | Triple Modular Redundant (TMR) Temperature Input Module

  • Brand: ICS Triplex (Part of Honeywell)
  • Model: T3431-IM
  • Product Type: Thermocouple Input Module (24-Channel)
  • Series: Trusted™ TMR (Triple Modular Redundant) Safety Platform
  • Core Function: Provides high-precision temperature monitoring via 24 thermocouple inputs, supporting J, K, S, T types. Integrates with Trusted TMR systems for fault-tolerant industrial control.
  • Key Specs: 24 differential thermocouple channels, 0.1% full-scale accuracy, -40°C to 85°C operating temperature, 24V DC power, TMR redundancy, SIL 3 certification.
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Part number: ICS Triplex T3431-IM
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Description

T3431-IM: Product Overview
The ICS Triplex T3431-IM is a 24-channel thermocouple input module​ designed for high-precision temperature monitoring in safety-critical industrial applications. Part of the Trusted™ TMR (Triple Modular Redundant) safety platform, it provides reliable temperature data to control systems while ensuring fault tolerance through triple-redundant architecture. The module supports multiple thermocouple types (J, K, S, T) and integrates seamlessly with ICS Triplex controllers (e.g., T8100) for applications like process heating, furnace control, and machinery temperature monitoring.
A key feature is its triple-modular redundant (TMR)​ design: three independent input channels process signals in parallel, with a voter circuit rejecting faulty data to maintain accurate readings. This ensures uninterrupted operation even if one channel fails, critical for industries where downtime risks safety or production losses. The T3431-IM also includes cold junction compensation​ (CJC) for accurate temperature measurement, noise suppression​ (70 dB minimum at 60/120 Hz) for harsh industrial environments, and fault diagnostics​ (e.g., thermocouple burnout detection) to alert operators of issues.
Engineered for durability, the module operates in a wide temperature range (-40°C to 85°C) and is resistant to vibration and shock—ideal for factories, refineries, and outdoor installations. It is part of the Trusted TMR ecosystem, which includes zone interface modules (T8448) and valve monitors (T8449), enabling scalable, secure temperature monitoring systems.

ICS Triplex T3431-IM

ICS Triplex T3431-IM

T3431-IM: Technical Specifications
  • Model Number: T3431-IM
  • Product Type: Thermocouple Input Module (24-Channel)
  • Input Channels: 24 differential thermocouple inputs (grouped into 3 sets of 8)
  • Thermocouple Types: J, K, S, T (configurable per group)
  • Accuracy: 0.1% of full scale
  • Temperature Range: -40°C to 85°C (operating); -40°C to 125°C (storage)
  • Resolution: 0.1°C (configurable as tenths or units)
  • Cold Junction Compensation (CJC): Built-in, ±1°C accuracy
  • Noise Rejection: 70 dB minimum at 60/120 Hz
  • Response Time: 50 ms maximum (step input)
  • Power Supply: 24V DC (±10% tolerance)
  • Isolation: 2500 VAC galvanic isolation between input module and multiplexer
  • Redundancy: Triple Modular Redundant (TMR) with voter circuit
  • Fault Diagnostics: Thermocouple burnout detection, open circuit detection, channel status monitoring
  • Communication: Integrates with Trusted TMR controllers via proprietary backplane (e.g., T8100)
  • Dimensions: 368mm (W) x 267mm (H) x 140mm (D) (approximate)
  • Weight: ~5kg (approximate)
  • Certifications: SIL 3 (IEC 61508), TÜV, UL, CE
T3431-IM: Core Features & Customer Value
Triple Redundancy for Zero Downtime: The TMR design ensures that a single channel failure (e.g., due to a faulty thermocouple or wiring error) does not disrupt temperature monitoring. The voter circuit cross-validates signals from all three channels, rejecting anomalies and maintaining accurate readings. This is critical for applications like furnace control, where temperature inaccuracies can lead to product defects or safety hazards.
High Precision for Critical Processes: With 0.1% full-scale accuracy and built-in cold junction compensation, the T3431-IM delivers reliable temperature data for processes requiring tight control (e.g., chemical reactions, plastic molding). Its low noise rejection (70 dB) ensures stable readings in environments with high electromagnetic interference (EMI), such as near motors or transformers.
Fault Tolerance for Harsh Environments: The module’s 2500 VAC galvanic isolation prevents ground loops and noise interference, while its wide operating temperature range (-40°C to 85°C) and vibration/shock resistance make it suitable for outdoor or industrial settings. Fault diagnostics (e.g., thermocouple burnout detection) alert operators to issues before they escalate, reducing unplanned downtime.
Seamless Integration with Trusted TMR Systems: The T3431-IM integrates with ICS Triplex controllers (e.g., T8100) via a proprietary backplane, enabling real-time temperature data transmission to the control system. This integration simplifies commissioning and allows for centralized monitoring of multiple temperature points across a plant.

ICS Triplex T3431-IM

ICS Triplex T3431-IM

T3431-IM: Typical Applications
The T3431-IM is deployed in safety-critical industrial processes​ where accurate temperature monitoring is essential:
  • Oil & Gas: Monitors furnace temperatures in refineries, pipeline heaters, and offshore platforms. Its TMR design ensures reliable operation in harsh offshore environments, while SIL 3 certification meets industry safety standards.
  • Chemical Processing: Controls temperature in reactors, distillation columns, and polymerization processes. The module’s high precision (0.1%) ensures consistent product quality, while fault diagnostics prevent costly shutdowns.
  • Power Generation: Monitors boiler temperatures in coal-fired or gas-fired power plants. Its wide operating temperature range and vibration resistance make it suitable for plant environments, while TMR redundancy ensures uninterrupted power generation.
  • Manufacturing: Controls temperature in plastic molding machines, extrusion lines, and drying ovens. The module’s fast response time (50 ms) enables real-time adjustments to maintain product consistency.

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