Description
Technical Specifications
| Parameter | Value |
| Manufacturer | ICS Triplex (Rockwell Automation) |
| Product Model | T8442 |
| Product Type | Trusted Triple Module Redundant (TMR) Speed Monitor Module |
| Safety Integrity Level | TÜV Certified IEC 61508 SIL 3 |
| Rotating Machine Groups | 3 independent rotating machine groups per module |
| Speed Inputs | 3 TMR speed inputs per rotating machine group (compatible with active or passive probes) |
| Control Outputs | 2 quad-redundant, fault-tolerant, volt-free shutdown control output structures per rotating machine group |
| Sequence of Events (SOE) | On-board SOE reporting with 1 ms resolution |
| Fault Tolerance | Hardware Implemented Fault Tolerance (HIFT) architecture |
| Isolation | 2,500 V impulse withstand opto/galvanic isolation barrier; galvanic isolation between field inputs/outputs |
| Associated FTA | Requires a single T8846 Safety Interface Termination Assembly (SIFTA) per hot-swap pair |
| Operating Temperature | 0 to +60°C (verify with OEM environmental profile for specific cabinet layouts) |
| Storage Temperature | -25 to +70°C |
| Dimensions & Weight | Height: 102 mm (4.0 in), Width: 391 mm (15.40 in), Depth: 127 mm (5.0 in); Weight: ~0.75 kg (1.6 lb) |
| Condition | New Original / Factory Sealed or Verified Surplus (verify availability upon inquiry) |
| Lead Time | Stock dependent; typically available for rapid dispatch or standard 4 to 6 week sourcing windows |
| Warranty | 12-month standard industrial replacement warranty |
| Indicative Price | Price subject to market conditions; contact us for a firm quote |
Functional Overview
The ICS Triplex T8442 is a high-integrity, Triple Module Redundant (TMR) speed monitoring module designed for critical turbomachinery protection and emergency shutdown (ESD) applications. Operating within the ICS Triplex Trusted safety platform, the T8442 provides comprehensive overspeed protection, rotational speed measurement, and monitoring for up to three separate rotating machine groups.
Utilizing Hardware Implemented Fault Tolerance (HIFT), the module continuously processes inputs from active or passive proximity probes without single points of failure. It delivers deterministic safety functions necessary for high-risk assets such as large steam turbines, gas compressors, and heavy industrial pumps in oil and gas, petrochemical, and power generation facilities.
Integration and Deployment Considerations
Companion Slot and Hot-Standby Configuration
The T8442 supports hot-standby module configurations utilizing an adjacent companion slot. Maintenance personnel can replace a faulted module under live-system conditions without triggering spurious trips, provided the system architecture is configured for redundant operation.
Termination and Cabling
Each T8442 hot-swap module pair interfaces with field signals via the T8846 Safety Interface Termination Assembly (SIFTA). Field wiring must use shielded twisted-pair cables terminated correctly to ground studs on the FTA to maintain electromagnetic compatibility (EMC) and noise immunity against high-frequency drives or plant radio interference.
Probe Compatibility
The module accepts inputs from standard speed probes (such as eddy current probes or magnetic pickups). Ensure power supply parameters and signal thresholds match probe operational requirements during loop-checking and calibration phases.
Frequently Asked Questions
Q: What safety certification does the T8442 module hold?
A: The T8442 is TÜV Certified for use in safety-critical loops up to SIL 3 in accordance with IEC 61508.
Q: How does the module handle a single probe failure within a TMR group?
A: Because each rotating machine group utilizes TMR speed inputs (three inputs per group), the voting architecture isolates a single channel discrepancy, maintaining continuous protection and logging the fault via on-board diagnostics without initiating a false trip.
Q: Is direct hot-swapping supported during runtime?
A: Yes, the module supports hot-swapping when installed in a redundant configuration with a companion module and proper system software authorization. Always verify system software status via the Trusted toolset before extracting live hardware.
