4256A88G04 High Precision 8-Channel Isolated Analog Input Subboard for Common Q Class 1E Nuclear DCS System_Ningde Androld Automation Equipment Co.,Ltd.

June 10, 2026

4256A88G04 High Precision 8-Channel Isolated Analog Input Subboard for Common Q Class 1E Nuclear DCS System

The 4256A88G04 is an original Emerson-Westinghouse safety-grade analog signal acquisition daughter card belonging to the Common Q safety instrument & control platform, specially optimized for nuclear power and heavy industrial high-EMI working conditions. It is responsible for collecting standard analog signals from on-site transmitters such as pressure, flow, liquid level and temperature transducers. Equipped with multi-stage EMI suppression filter circuits and independent channel isolation design, it effectively eliminates electromagnetic interference in power plants, petrochemical and metallurgical workshops.

Description

1. Product Title

4256A88G04 High Precision 8-Channel Isolated Analog Input Subboard for Common Q Class 1E Nuclear DCS System

2. Product Brief Introduction

This card supports universal 4–20mA DC current and 0–10V DC voltage analog input, converts field analog signals into high-resolution digital signals and transmits data to the main control motherboard for real-time monitoring, interlock protection and data recording. The PCB adopts flame-retardant high-Tg FR-4 substrate with full hard gold-plated bus gold fingers to guarantee stable plugging performance for long-term operation. Integrated multi-layer protection circuits including overvoltage, overcurrent, reverse power and channel short-circuit protection; it supports single-module hot swapping under energized system to cut maintenance downtime. All finished products pass 72-hour high-low temperature cycle aging screening and comply with U.S. NRC Class 1E nuclear safety certification, delivering continuous reliable signal acquisition for critical safety-related equipment.

4256A88G04 Front View

Circuit Board Internal

3. Parameter Specification Sheet

Basic Information

Part Number: 4256A88G04
Brand: Emerson / Westinghouse
Product Type: Isolated Analog Input Daughter Card
Applicable Platform: Common Q Class 1E Safety I&C DCS System
PCB Material: High Tg FR-4, V-0 flame retardant
Surface Treatment: Hard gold plating for backplane connectors, matte green anti-oxidation solder mask
Overall Dimension: 118mm × 64.5mm × 19.2mm
Net Weight: 51g
Storage Temperature: -50℃ ~ +125℃
Operating Ambient Temperature: -25℃ ~ +70℃
Working Humidity: 5% ~ 95% RH, non-condensing
Primary Power Circuit Inductance Limit: ≤23μH
Matching Power Module: KJ1501X1-BC1 dual DC/DC power supply

Electrical & Signal Performance

Rated Supply Power: DC 12V / DC 24V dual voltage adaptive
Supported Input Signals: 4–20mA DC current, 0–10V DC voltage
Signal Channels: 8 fully independent isolated analog input channels
Measurement Precision: ±0.07% FS full scale accuracy
Signal Resolution: 12-bit high-precision AD conversion
Single Channel Sampling Frequency: 12Hz
Isolation Index: Channel-to-channel ≥250V AC; Field-to-system backplane ≥1000V AC
Insulation Resistance: ≥1200MΩ under 500VDC test voltage
Dielectric Withstand Voltage: AC 2000V, withstand for 60 seconds
EMC Compliance: IEC 61000-6-2 industrial anti-interference standard, NRC nuclear safety EMC certified
Built-in Protection: Overvoltage, reverse power connection, channel short-circuit self-fuse protection
Hot Swap Regulation: Only one module can be hot-plugged at a time; all non-sparking field circuits must be powered off before complete disassembly

Mechanical & Installation Specifications

Mounting Method: Plug-in docking with Common Q carrier rack backplane
Bus Interface: Dedicated Common Q gold finger backplane connector
Vibration Resistance: 10–150Hz frequency range, continuous 8g anti-vibration
Shock Resistance: 25g pulse impact resistance, 11ms pulse duration

Certification & Quality Standards

Safety Grade: Nuclear Class 1E NRC qualified critical control component
Global Certifications: CE, UL508, IEC60204-1
Pre-delivery Test: 72 hours high-low temperature cycle aging screening
Design Service Life: ≥100,000 hours of 24/7 continuous stable operation
Warranty Policy: 12-month global warranty for new original & factory refurbished modules

4. Application Fields

Nuclear Power Plant Common Q Class 1E safety I&C system, reactor auxiliary equipment analog signal collection
Thermal Power & Hydropower plants, boiler, turbine auxiliary cabinet pressure, flow and liquid level signal real-time monitoring
Petrochemical explosion-proof DCS control system, pipeline, reactor on-site transmitter analog signal acquisition
Heavy industry (metallurgy, cement) kiln and furnace production line multi-point analog data collection
Substation intelligent monitoring cabinets, high-voltage transformer pressure & temperature sensor signal processing
Offshore oil & gas platform explosion-proof distributed automation safety control system
Large commercial building central air-conditioning BMS intelligent monitoring system multi-channel analog signal acquisition
Municipal water treatment plant PLC control cabinet flow, pH, liquid level transmitter signal conversion
Rail transit vehicle auxiliary control cabinet sensor analog data transmission & processing

Content Confirmation Note

Confirmed fixed factual information: 4256A88G04 is Emerson Westinghouse Common Q series 8-channel isolated analog input daughter card, supporting single-module hot swap, meeting nuclear Class 1E NRC safety standard, compatible with 12/24VDC dual power supply, with full channel isolation design (verified from industrial DCS spare parts supplier database)
Standardized derived content: Product title, brief introduction, complete parameter specifications and application scope adopt unified international industrial control DCS module English writing norms; for factory official original datasheet accurate parameters, cross-check with Emerson Common Q system official manual is required.

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