WOODWARD 8444 Series Modules | 8444-1002 Measuring Transducers

Technical Dossier

Product Details And Specifications

WOODWARD 8444 Series: Comprehensive Module Range and Technical Overview

The WOODWARD 8444 Series represents a mature, field-proven line of measuring transducers and signal conditioning modules deployed extensively across global heavy industry sectors including petrochemical refineries, thermal and nuclear power generation facilities, offshore platforms, and continuous-process chemical plants. These modules serve as critical interface components within WOODWARD's governor and turbine control architectures, converting raw analog process signals—speed, temperature, pressure, and load—into standardized outputs compatible with supervisory control and data acquisition (SCADA) systems and distributed control systems (DCS). The 8444 Series has accumulated decades of installed base across OEM turbine packages from GE, Siemens, Solar Turbines, and Dresser-Rand, making long-term spare parts availability a primary operational concern for plant maintenance engineers worldwide.

The Evolution of 8444 Series Architecture

The 8444 Series was introduced as part of WOODWARD's analog control module ecosystem, designed to interface with early electro-hydraulic governor systems and later integrated into the NetCon and MicroNet control platforms. Early variants of the 8444 line used discrete analog circuitry with ±15 VDC dual-rail power supplies and passive signal isolation. As industrial control standards evolved through the 1990s and 2000s, WOODWARD refined the 8444 Series to support 4–20 mA loop-powered outputs, improved EMI shielding per IEC 61000-4, and tighter linearity tolerances required by API 670 machinery protection standards.

Compatibility considerations are significant for maintenance engineers: early 8444 modules used DIN rail mounting with proprietary backplane connectors, while later revisions adopted standard 24-pin edge connectors compatible with WOODWARD's 5400-series card cages. Cross-compatibility between sub-generations requires verification of firmware revision and backplane bus voltage. As the broader WOODWARD analog control portfolio has transitioned toward the MicroNet Plus and ProTech TPS digital platforms, the 8444 Series has entered a sustained maintenance phase—WOODWARD no longer manufactures new units, making certified refurbished and new-old-stock (NOS) inventory the primary sourcing channel for operating plants.

8444 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced models within the WOODWARD 8444 Series. Each entry reflects the module's primary functional role within turbine and generator control systems:

8444-1002: Measuring transducer module; converts analog process signals to standardized control outputs for governor interface applications.
8444-1003: Speed measuring transducer; magnetic pickup input, 4–20 mA output, for turbine shaft speed monitoring.
8444-1004: Dual-channel analog input transducer; differential signal conditioning with galvanic isolation.
8444-1005: Temperature transducer module; RTD/thermocouple input, linearized mV output for exhaust gas temperature loops.
8444-1006: Load-sharing transducer; kW/kVAR signal processing for parallel generator synchronization panels.
8444-1007: Pressure transducer interface; 0–10 VDC input scaling, 4–20 mA retransmission output.
8444-1008: Frequency-to-DC converter; magnetic pickup or proximity probe input, adjustable span and zero.
8444-1009: Vibration transducer signal conditioner; compatible with Bently Nevada-type proximity probes, 0–10 VDC output.
8444-1010: Isolated analog output module; 4–20 mA loop-powered, for DCS analog input card interface.
8444-1011: Multi-range current transducer; AC current input via CT, 4–20 mA DC output for generator load metering.
8444-1012: Voltage transducer module; AC voltage input via PT, scaled DC output for AVR and protection relay interface.
8444-1013: Power factor transducer; single-phase or three-phase input, 4–20 mA output for power management systems.
8444-1014: Differential pressure transducer interface; bridge-type sensor input, linearized 4–20 mA output.
8444-1015: Analog signal isolator/repeater; loop-powered, 4–20 mA in / 4–20 mA out, 1500 VAC isolation barrier.
8444-1016: Position transducer module; LVDT input conditioning, ±10 VDC output for valve position feedback loops.
8444-1017: Dual-output transducer; single process input retransmitted to two independent 4–20 mA outputs for redundant DCS channels.
8444-1018: Thermocouple cold-junction compensated transducer; Type K/J/T input, 4–20 mA output, DIN rail mount.

Sourcing Hard-to-Find & Obsolete 8444 Series Parts

DriveKNMS maintains a dedicated inventory program for WOODWARD 8444 Series modules, specifically addressing the sourcing gap created by the series' end-of-manufacture status. Our procurement network spans authorized WOODWARD service centers, OEM decommissioning projects, and certified industrial surplus channels across North America, Europe, and Asia-Pacific.

Quality Control for the 8444 Series Range

The WOODWARD 8444 Series presents specific quality verification challenges due to its analog signal chain architecture and the prevalence of aged electrolytic capacitors in long-stored units. DriveKNMS applies a structured test protocol to all 8444 Series modules prior to shipment:

Each unit undergoes incoming visual inspection for PCB corrosion, connector pin integrity, and component-level damage. Functional testing is performed using calibrated signal sources traceable to NIST standards, verifying input-to-output linearity across the full specified range (typically ±0.1% FS). Power supply rail voltages are measured under load. For modules with isolated outputs, dielectric withstand testing is performed at 1500 VAC for one minute per IEC 61010-1. Burn-in testing at elevated ambient temperature (50°C, 48 hours) is applied to units sourced from long-term storage to screen for latent component failures. Final calibration data is recorded and shipped with each unit.