• Core Function: Provides 8 isolated thermocouple input channels for high-precision temperature monitoring, supporting J/K/T/E/S/B types; interfaces with ControlEdge C300 controllers for process control and safety system integration.
• Key Specs: 8 channels, ±0.1% full-scale accuracy, built-in cold junction compensation (±1°C), 24V DC power, -40°C to +70°C operating temperature, SIL 2 certified, hot-swappable design.
Manufacturer: Honeywell Part number: Honeywell 8U-TCNT01
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8U-TCNT01: Product OverviewThe 8U-TCNT01 is an 8-channel thermocouple input module designed for integration into Honeywell’s ControlEdge™ C300 distributed control system (DCS) and safety instrumented systems (SIS). It serves as a front-end interface for acquiring temperature signals from field-mounted thermocouples, converting millivolt-level outputs into calibrated temperature data for controller processing. Its primary role is to enable reliable, high-precision temperature monitoring in applications where process stability (e.g., chemical reaction control) or safety (e.g., reactor overtemperature shutdown) depends on accurate thermal data.Functionally, the module processes inputs from 8 independent channels, each configurable for J, K, T, E, S, or B type thermocouples. It employs built-in cold junction compensation (CJC) to eliminate errors from terminal block temperature variations and galvanic isolation (1500VAC) to prevent ground loops and electromagnetic interference (EMI). As part of the ControlEdge C300 family, the 8U-TCNT01 integrates with the platform’s high-speed I/O link, hot-swappable architecture, and unified engineering tools (ControlEdge Builder), simplifying configuration and maintenance. This design aligns with applications requiring compliance to IEC 61508 (SIL 2) and adherence to standards like API 556 (refinery instrumentation) or ASME PTC 19.3 (temperature measurement).8U-TCNT01: Technical Specifications
• Model Number: 8U-TCNT01
• Manufacturer: Honeywell
• Product Type: Thermocouple Input Module
• Number of Channels: 8 (individually isolated)
• Thermocouple Types: J, K, T, E, S, B (configurable per channel)
• Accuracy: ±0.1% of full scale (FS) at 25°C; ±0.2% FS over operating range
• Response Time: <50 ms (step input to controller update)
• Certifications: SIL 2 (IEC 61508), CE, UL, ATEX Zone 2 (optional)
• Dimensions: 25mm x 128mm x 115mm (width x height x depth, fits C300 I/O slot)
• Weight: 0.21kg
• Diagnostics: Open circuit, short circuit, CJC failure, power monitoring
• Hot Swap Support: Yes (plug-and-play replacement without system shutdown)
Honeywell 8C-TAOXB1 51307137-175
Core Features & Customer ValueHigh-Precision Temperature Measurement for Process Control: The 8U-TCNT01’s ±0.1% FS accuracy and built-in CJC ensure minimal error in temperature readings, critical for controlling sensitive processes like polymerization reactors or distillation columns. For example, in a chemical plant’s exothermic reactor, precise monitoring of ±0.5°C prevents runaway reactions. The ability to configure channels for different thermocouple types (e.g., K-type for high temps, T-type for cryogenics) avoids the need for multiple modules, simplifying inventory.Galvanic Isolation Protects Against Electrical Noise: With 1500VAC isolation between channels and the C300 bus, the module prevents EMI from industrial equipment (e.g., motors, welders) from distorting thermocouple signals. In a steel mill’s furnace temperature monitoring system, this ensures reliable data despite high electromagnetic fields, avoiding false alarms that could halt production.Comprehensive Diagnostics Reduce Maintenance Time: Built-in diagnostics detect open circuits (broken thermocouple wires), short circuits (to ground/power), and CJC sensor failures. Faults are reported to the C300 controller via I/O link, with LED indicators on the faceplate for quick visual identification. For maintenance teams, this cuts troubleshooting time from hours to minutes—e.g., identifying a failed thermocouple in a power plant’s boiler without invasive testing.Hot-Swappable Design Minimizes Downtime: The module can be replaced while the system remains powered, essential for continuous processes like oil refining or pharmaceutical manufacturing. Technicians simply remove the faulty module and insert a new one; the C300 controller automatically reloads configuration data via I/O link. This eliminates scheduled shutdowns for module replacement, saving thousands in lost production per incident.SIL 2 Certification for Safety-Critical Applications: When integrated into a Honeywell Safety Manager SIS, the 8U-TCNT01 meets SIL 2 requirements (IEC 61508), enabling its use in safety functions like reactor overtemperature shutdown or furnace flameout protection. Its fault-tolerant design (hardware fault tolerance ≥1) reduces the probability of dangerous failures, aligning with audit requirements for regulated industries.Typical ApplicationsThe 8U-TCNT01 is deployed in systems requiring reliable thermocouple-based temperature monitoring. In a petroleum refinery’s catalytic reformer, it connects 8 K-type thermocouples monitoring reactor tube temperatures. The module’s ±0.1% accuracy ensures optimal catalyst performance, while SIL 2 certification supports emergency shutdown logic if temperatures exceed safe limits.At a chemical plant’s distillation column, the 8U-TCNT01 interfaces with 8 T-type thermocouples measuring overhead vapor temperatures. Its CJC compensates for outdoor cabinet temperature swings, ensuring precise reflux ratio control to maximize product purity. Hot-swap capability allows maintenance during planned turnarounds without halting separation processes.In a municipal waste-to-energy plant, the module monitors 8 S-type thermocouples in the incinerator’s combustion chamber. Its -40°C cold-start capability ensures reliable operation during winter outages, while diagnostics alert staff to a thermocouple drift before emissions exceed EPA limits.
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