Parameter Specifications

1. Part Number: 4D33935H01

2. Manufacturer: Emerson Westinghouse

3. Compatible System: Common Q Class 1E Safety Instrument & Control DCS System

4. Matching Accessories: High-speed encoder master acquisition boards, 49E-3649 rack backplane, 475HP1ENA9GMT redundant rack power supply

5. PCB Material: Multi-layer isolated high-Tg high-temperature zero-halogen V-0 flame-retardant FR-4 substrate

6. Dimension & Weight: 145mm × 66mm × 62g; Net weight: 62g

7. Ambient Operating Envelope (H version core advantage)

   Operating Temp: -25℃ ~ +80℃ (standard G01 only up to +70℃)

   Storage Temp: -50℃ ~ +130℃

   Humidity: 5%–95% RH, non-condensing, high-temperature anti-oxidation conformal coating

8. Power Supply: DC 12V / DC 24V dual adaptive wide-range input

9. Input Channels: 8 fully independent galvanic isolated high-speed pulse/encoder channels

10. Supported Signal Types

    • Single-ended NPN/PNP 0–24VDC pulse

    • A/B/Z phase incremental differential encoder signal

    • Pulse frequency range: 0.01Hz ~ 250kHz (higher bandwidth than standard 4D33934 series)

    • 32-bit cumulative pulse counting range: 0 ~ 999,999,999

    • Signal logic threshold: Low ≤6VDC, High ≥18VDC

11. Isolation Performance

    Channel-to-backplane isolation: 1500V AC

    Dielectric withstand: 2000V AC / 60s

    Insulation resistance: ≥1200MΩ @ 500VDC

12. EMC Anti-interference Performance

    Power frequency interference attenuation ≥40dB, fully compliant with IEC 61000-6-2 industrial EMC standard + nuclear plant high-temperature supplementary electromagnetic screening requirements

13. Protection & Intelligent Diagnosis Functions

    Per-channel input overcurrent limiting protection

    Bidirectional high-temperature resistant TVS surge absorption circuit

    Reverse wiring polarity lockout anti-damage protection

    Real-time full fault detection: encoder line open-circuit, short-circuit, A/B phase loss, Z marker missing, frequency out-of-range, signal amplitude abnormal, sensor power loss

    Time-stamped fault status + channel number + fault classification uploaded to master controller

14. Mechanical Reliability

    Continuous vibration resistance: 8g (10–150Hz)

    Shock resistance: 25g pulse, duration 11ms

15. Core Feature: Single module hot swappable under energized rack without interrupting safety encoder & high-speed pulse measurement loops; High-temperature resistant design for near-primary equipment cabinets

16. Certifications: CE, UL508, IEC60204-1, NRC Class 1E nuclear safety qualification, high-temperature thermal aging screening certification

17. Aging Validation Standard: 72-hour full-load high-low temperature cyclic aging test + 168h high-temperature thermal soak test + frequency precision calibration screening

18. Design Service Life: ≥100,000 hours of 24/7 unattended continuous operation

19. Warranty Period: 12-month global unified warranty for original factory modules and certified factory refurbished modules

Application Fields

1. Nuclear Power Plant Common Q Safety I&C Racks

   High-temperature dedicated multi-channel encoder acquisition terminal for reactor primary equipment adjacent safety cabinets, collecting main coolant pump A/B/Z incremental encoder signals, turbine high-speed speed probes and precision chemical dosing flow pulse transmitters for overspeed trip interlock and flow cumulative calculation.

2. AP1000 Nuclear Post-Accident Monitoring System (PAMS)

   High-temp anti-interference encoder input board for containment passive cooling circulation pump encoders, emergency cooling fan high-frequency speed sensors and post-accident flow pulse measurement.

3. Thermal & Hydropower Station Main Control Systems

   High-temperature resistant encoder module for turbine main shaft incremental encoders, feedwater pump high-speed speed probes and boiler circulating fan rotational speed monitoring.

4. High-Risk Explosion-Proof Petrochemical DCS Distributed Control System

   High-temperature pulse signal terminal card for high-temperature reactor agitator encoders, high-pressure process flow pulse meters and furnace feed pump speed sensors in high-temperature hazardous explosion zones.

5. Offshore Oil & Gas Explosion-Proof Automation Racks

   High-temp isolation encoder acquisition interface for crude pipeline high-temperature flow pulse transmitters, high-temperature separator pump encoders and marine platform heating circulation pump speed probes.

6. Large Diesel Generator Safety Sequential Control Cabinets

   High-temperature multi-point encoder subcard for genset crankshaft incremental encoders, high-temperature cooling water flow pulse meters and fuel precision metering pulse transmitters for overspeed protection logic.

7. Municipal Large-Scale Water Treatment Safety Interlock DCS Systems

   High-temperature resistant isolated pulse terminal for heat exchange station high-temperature pipeline flow pulse meters, sludge drying high-temperature pump encoders and chemical dosing flow cumulative monitoring.

8. Metallurgy & Cement Kiln Production Lines

   Heavy-duty high-temperature high-speed encoder acquisition module for kiln rotary furnace main drive encoders, high-temperature exhaust gas flow pulse transmitters and raw material preheating furnace feeding speed probes.

H Suffix Special Version Core Difference vs Standard 4D33935G01

1. Operating upper temperature limit raised from +70℃ to +80℃, suitable for near-primary equipment cabinets with high ambient heat dissipation

2. Full board high-temperature anti-oxidation conformal coating, components passed extended thermal soak aging screening

3. TVS surge absorption devices upgraded to high-temperature resistant models, no performance degradation under long-term high-temperature working conditions

4. Maximum supported pulse frequency expanded from 100kHz to 250kHz, compatible with high-speed incremental encoder signals of nuclear primary pumps

5. Added independent high-temperature thermal drift compensation algorithm, guarantee speed & counting precision under wide temperature fluctuation

6. Mechanical dimensions, backplane pin definitions, signal logic fully consistent with standard G version, direct drop-in replacement

Common Q Series Unified Version Suffix & Iteration Rule

1. Suffix rule:

   • Gxx: General industrial standard version (G01/G02~G06)

   • Hxx: High-temperature reinforced special version

   • G series iteration consistent with all I/O boards: G01 basic / G02 reinforced / G03 nuclear high-isolation / G04 ultra-high isolation / G05 seismic / G06 radiation-seismic dual certified

2. 4D33935 series positioning difference vs 4D33934

   • 4D33934: Universal low/medium speed pulse counter (max 100kHz, no A/B/Z phase encoder support)

   • 4D33935: Dedicated high-speed A/B/Z incremental encoder card (max 250kHz, differential encoder compatible, H variant high-temp upgrade)