Yokogawa YEWFLO F9328QM-02 PCB Card

Technical Dossier

Product Details And Specifications

Yokogawa YEWFLO Series Technical Notes

The Yokogawa YEWFLO series represents one of the most widely deployed vortex flowmeter platforms in global heavy industry. Installed across petrochemical complexes, nuclear power stations, LNG terminals, and crude oil refineries, YEWFLO transmitters and their associated PCB assemblies form a critical measurement layer in distributed control system (DCS) architectures. The F9328QM-02 is a signal processing PCB card used within YEWFLO vortex flowmeter bodies, responsible for conditioning raw vortex-shedding frequency signals into calibrated 4–20 mA or HART/FOUNDATION Fieldbus outputs. Its failure directly impacts flow measurement accuracy and process safety interlock reliability.

The Evolution of YEWFLO Architecture

The YEWFLO product line was introduced by Yokogawa in the late 1980s as a response to growing demand for non-intrusive, low-maintenance flow measurement in high-temperature and high-pressure process environments. Early generations (DY series) used analog signal conditioning boards with discrete component layouts. The transition to the DYA and DYF sub-series in the 1990s introduced microprocessor-based signal processing, enabling self-diagnostics and digital communication protocols including BRAIN and early HART implementations.

By the 2000s, YEWFLO expanded into dual-sensor configurations (for simultaneous flow and density measurement) and adopted FOUNDATION Fieldbus and PROFIBUS PA as standard communication options. The F93xx-series PCB cards — including the F9328QM-02 — belong to this mid-to-late generation architecture, characterized by surface-mount component density, onboard EEPROM for calibration data storage, and compatibility with Yokogawa's PRM (Plant Resource Manager) asset management platform.

As of 2026, the YEWFLO DY series has entered the mature/end-of-life phase. Yokogawa's current recommended successor platform is the YEWFLO DY with Enhanced Diagnostics (DYA-series with vortex strength monitoring). However, the installed base of legacy YEWFLO units in long-lifecycle plants (refineries, nuclear facilities) remains substantial, making PCB-level spare parts such as the F9328QM-02 critical for lifecycle extension programs.

YEWFLO Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked components within the YEWFLO series. Classifications are based on functional role within the transmitter assembly.

Signal Processing & Amplifier PCB Cards

• F9328QM-02: Main signal processing PCB card; vortex frequency conditioning and 4–20 mA output generation
• F9328QM-01: Earlier revision of the QM-02 board; identical footprint, reduced diagnostic capability
• F9328SM-01: Signal amplifier sub-board; interfaces sensor element to main processing PCB
• F9328SM-02: Revised amplifier board with improved EMI shielding for high-noise environments
• F9328PM-01: Power supply regulation PCB; converts 24 VDC loop power to internal logic rails

Communication & Output Modules

• F9328HM-01: HART communication module; enables HART 5/7 superimposed signal on 4–20 mA loop
• F9328FM-01: FOUNDATION Fieldbus H1 communication card; replaces analog output in FF-configured transmitters
• F9328BM-01: BRAIN protocol communication board; used in legacy Yokogawa DCS-integrated installations
• F9328PM-02: Profibus PA interface card; for installations integrated with Siemens or ABB DCS via PA segment

Sensor & Detector Assemblies

• DY015-BABB21: YEWFLO vortex sensor assembly, 15 mm bore, stainless body, ANSI 150 flange
• DY025-BABB21: 25 mm bore vortex sensor assembly; standard process connection
• DY050-BABB21: 50 mm bore; high-flow process lines, refinery service
• DY080-BABB21: 80 mm bore vortex sensor; common in steam flow measurement applications
• DY100-BABB21: 100 mm bore; large-diameter process piping, chemical plant service

Transmitter Housings & Accessories

• F9328EM-01: EEPROM memory module; stores calibration constants and tag configuration data
• F9328DM-01: Display/indicator PCB; 5-digit LCD readout for local flow indication
• K9328-01: Terminal block assembly; field wiring connection block for YEWFLO transmitter head

Sourcing Hard-to-Find & Obsolete YEWFLO Parts

DriveKNMS sources F9328QM-02 and related YEWFLO PCB assemblies through verified secondary market channels, decommissioned plant asset liquidations, and authorized repair-and-return programs. All units are cross-referenced against Yokogawa's original part numbering system to prevent counterfeit substitution. For plants requiring a minimum 5-year spare parts buffer — a common requirement in nuclear and refinery turnaround planning — DriveKNMS can provide bulk quotation and bonded warehouse storage arrangements.

Quality Control for the YEWFLO Range

YEWFLO PCB cards, including the F9328QM-02, present specific quality verification challenges due to their integrated calibration data storage and multi-layer signal conditioning architecture. DriveKNMS applies the following test protocol to all YEWFLO PCB assemblies prior to dispatch: