ICS Triplex T8442
ICS Triplex T8442
ICS Triplex T8442
ICS Triplex T8442
ICS Triplex T8442
ICS Triplex T8442
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T8442

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The T8442 is a Trusted TMR Speed Monitor module with three independent rotating machine groups, each with three TMR speed inputs and two fault-tolerant relay outputs, certified to IEC 61508 SIL 3 for over-speed and over-acceleration protection.
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Technical specifications for T8442

  • Manufacturer:
    ICS Triplex
  • Part Number:
    T8442
  • Product Family:
    Trusted Triple Modular Redundant
  • Product Type:
    Trusted TMR Speed Monitor
  • Machine Groups:
    3 independent groups
  • Speed Inputs per Group:
    3 TMR channels (active or passive)
  • Outputs per Group:
    2 quad-redundant, fault-tolerant relays
  • Frequency Range:
    Up to 30,000 Hz
  • Speed Measurement Resolution:
    ±1 RPM
  • Accuracy:
    0.01% of full scale or 1 RPM
  • SOE Resolution:
    1 ms
  • Isolation:
    2500 V impulse withstand
  • Power Consumption:
    22 W @ 24 Vdc
  • Safety Certification:
    IEC 61508 SIL 3, TÜV certified
  • Key Benefit:
    Solves the challenge of reliable turbine overspeed protection with TMR input voting, quad-redundant outputs, and independent operation—maintains safety functions even during processor communication failures.
  • Weight:
    1.2 kg
  • Estimated shipping dimensions:
    3x30.2x26.5cm
  • Tariff Code:
    8517795000
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Application Certification Standards Compatibility

Features:

  • Triple Modular Redundant (TMR) speed inputs with 2-out-of-3 voting for each of three independent machine groups, ensuring fault tolerance for overspeed detection.
  • Quad-redundant, fault-tolerant relay outputs per group with force-guided contacts and current sensing diagnostics, enabling safe shutdown even after multiple component failures.
  • Independent operation from the main processor—once configured, the T8442 executes shutdown logic autonomously, maintaining safety during communication loss.
The T8442 employs a 2-out-of-3 voting scheme across its three TMR speed input channels per group, ensuring that a single sensor or input circuit failure does not compromise overspeed detection. Each channel is galvanically isolated with 2500 V impulse withstand, protecting the system from field-side transients.

Each machine group on the T8442 features two independent output channels—one for over-speed and one for over-acceleration—each built with four redundant relays arranged in a series/parallel structure. This quad configuration ensures that no single relay failure can prevent a trip command from reaching the field actuator. Force-guided contacts provide positive confirmation of relay state, while current sensors in each leg verify load continuity.

Once configured, the T8442 operates autonomously, executing its overspeed and over-acceleration logic without continuous supervision from the main processor. This independence ensures that even if processor communications fail or the application program stops, the safety functions remain active. The module supports hot-standby configurations with companion slots, allowing online replacement without process interruption.

The T8442 ICS Triplex TMR Speed Monitor module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

ICS Triplex T8442 Standard Accelerometer Interconnect Cable Manuals, Datasheets, Drivers, Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
ICS Triplex T8442 Universal AC Power Supply Specs

General

  • Manufacturer ICS Triplex
  • Model T8442
  • Condition New Original ready stock
  • Product Family T8403C,T8431C,T8302,T8451
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Emergency Shutdown (ESD) Systems: Monitor stop buttons, pressure switches, level switches, etc., and trigger a safe shutdown in case of danger.
  • Fire and Gas Monitoring Systems (F&G): Receive digital signals from flame detectors, smoke detectors, and gas sensors.
  • Boiler Management Systems (BMS): Ensure that the start-up, operation, and shutdown processes of boilers and furnaces comply with safety logic.
  • Functional Safety Certification: TÜV Rheinland certified, compliant with IEC 61508, supporting safety circuits up to SIL 3 level.
  • Explosion-proof Certification: ATEX and IECEx certified, allowing installation in Zone 2 hazardous areas (requires appropriate cabinetry).
  • Environmental and Electromagnetic Compatibility: Meets CE marking requirements and is UL/CSA North American safety certified.
  • Designed specifically for Rockwell ICS Triplex Trusted™ controller racks, it cannot be directly inserted into third-party racks.
  • Fully compatible with Trusted™ T8000 series processors, power supplies, and T8403 digital output modules.
  • Communication and Networking Integration: Supports industrial protocols such as EtherNet/IP and Modbus TCP/RTU through the controller, enabling communication with Rockwell's ControlLogix systems or third-party DCS systems (such as Honeywell and DeltaV).
Description
The T8442 monitors shaft speed and acceleration for up to three rotating machines simultaneously, providing critical over-speed and over-acceleration shutdown functions. Each machine group has three TMR speed input channels that accept both active and passive probes via the T8846 SIFTA, with 2500 V impulse withstand isolation. 

Designed for steam and gas turbines driving pumps, compressors, and generators, the T8442 operates as a self-contained fault-tolerant sub-system within the Trusted environment. Its Hardware Implemented Fault Tolerance (HIFT) architecture allows it to continue safe operation after a single failure, with comprehensive self-diagnostics reporting faults through front-panel LEDs and application variables. 

The T8442 features hot-swappable companion slot configuration for standby modules, enabling online replacement without process interruption. Configuration parameters—including over-speed limits, acceleration filters, deadbands, and degradation modes—are set through the System Configuration tool and downloaded to the module during initialization. 

This speed monitor solves the challenge of reliable turbine overspeed protection by combining TMR input voting with quad-redundant output structures in a single SIL 3 certified module. Its ability to run independently of the main processor ensures that safety functions remain operational even during communication failures.
Alternative Names
T8403C T8431C T8302 T8451
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How many rotating machines can one T8442 monitor?
Up to three independent machines. Each of the three groups provides three speed inputs and two relay outputs for a complete turbine train.
What types of speed probes work with the T8442?
Both active and passive probes are supported through the T8846 SIFTA, which provides signal conditioning and power for active sensors.
What happens if the main processor loses communication with the T8442?
The module continues to monitor speed and execute shutdown functions independently—safety is not compromised by communication failures.
Can I replace a faulty T8442 without shutting down the process?
Yes, using the companion slot configuration, a standby module can be installed and the active module swapped online without process interruption.

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