1.Product Overview​

The ​Allen-Bradley 1794-IJ2/A FLEX I/O™ Isolated RTD Input Module​ provides high-precision temperature monitoring for critical industrial processes. Designed for Rockwell Automation’s modular FLEX platform, this 2-channel module supports ​2-/3-/4-wire Pt100/200/500/1000 RTDs​ with ​channel-to-channel isolation​ (300V AC) and ​1500V AC backplane isolation. Its rugged epoxy-potted construction (–40°C to +70°C) withstands extreme humidity (>95%), chemical exposure, and vibration (5g @ 15Hz). Featuring ​24-bit delta-sigma ADC resolution, it achieves ±0.1°C accuracy with built-of ​lead resistance compensation​ for long cable runs. Integrated diagnostics include open-wire detection, sensor drift alerts, and NAMUR NE43-compliant failure signaling for SIL 2 applications.

​2.Critical Technical Specifications​

​Performance-defining parameters:

• ​Input Types: 2/3/4-wire RTDs: Pt100/200/500/1000, Cu10, Ni120 (IEC 751)
• ​Measurement Accuracy: ±0.1°C @ 0-100°C (3-wire Pt100), ±0.05% FSR overall
• ​Excitation Current: 0.5mA/1.0mA software-selectable (minimize self-heating)
• ​Lead Resistance Compensation: Auto-corrects up to 30Ω per wire
• ​Sample Rate: 480ms per channel with 50/60Hz noise rejection >120dB
• ​Isolation: 300V AC channel-channel, 1500V AC field-backplane (EN 50178)
• ​Power Consumption: 95mA @ 5V DC backplane, 22mA @ 24V field
• ​Certifications: ATEX II 3G, IECEx, SIL 2 (IEC 61508), cULus HazLoc
• ​EMC Compliance: EN 61326-3-1 (medical-grade immunity)

​3.Targeted Applications​

​Mission-critical temperature monitoring:

• ​Pharmaceutical Sterilization: Autoclave vessel profiling with 21 CFR Part 11 compliance
• ​Oil & Gas: Pipeline PT100 monitoring in ATEX Zone 1 hazardous areas
• ​Food Processing: Pasteurization temperature validation (EHEDG-compatible)
• ​Power Transformers: Winding temp surveillance via 4-wire Pt100s (IEC 60076)
• ​Semiconductor Fabs: Diffusion oven control with ±0.2°C stability
• ​HVAC: Chiller plant efficiency optimization with Cu10 sensors
  Ensures SIL 2 safety interlocks for reactor over-temperature protection and burner management.

4.​Competitive Advantages​

​Operational differentiators:

• ​Accuracy Leadership: 24-bit ADC outperforms standard 16-bit modules by 4× resolution
• ​Diagnostic Intelligence: Detects 0.5Ω lead degradation 10× faster than competitors
• ​Safety Integration: Certified for safety-instrumented systems (SIS) without external barriers
• ​Calibration Economy: Auto-zero compensation eliminates field recalibration for 5+ years
• ​Space Efficiency: 75mm DIN-rail width consolidates dual-isolated channels
• ​Wiring Flexibility: Accepts 18-12 AWG wires without ferrule requirements
• ​Noise Immunity: 10kV/µs common-mode rejection in VFD-heavy environments

5.Functional Capabilities​

​Advanced process monitoring:

• ​Predictive Maintenance: Tracks RTD resistance drift trends via embedded trend logs
• ​NAMUR NE43 Compliance: Outputs >22mA/<3.8mA for sensor failure diagnostics
• ​Sensor Matching: Auto-identifies Pt100 curve deviations (DIN 43760 vs. IEC 751)
• ​Programmable Alarms: High/low/rate-of-change limits with latching options
• ​Cold Junction Compensation: ±0.25°C accuracy for integrated thermocouple ref
• ​Linearization: Supports custom RTD curves (Callendar-Van Dusen coefficients)
• ​Data Stamping: 10ms-resolution event logging for sequence-of-events analysis

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Packaging & Shipping

Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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