VIBRO-METER EA402 (913-402-000-012) — Industrial signal conditioner for vibration and dynamic process monitoring

The VIBRO-METER EA402 is a compact conditioning module used to power and condition piezoelectric vibration sensors and route clean, scaled signals to control or protection systems. The build code 913-402-000-012 indicates a specific factory configuration of the EA402, typically preset for IEPE-type accelerometers with a proportional process output (commonly 4–20 mA) and a buffered dynamic output for diagnostics. From my experience, it’s a practical fit when you need dependable vibration trending into a DCS/PLC while keeping a full-bandwidth signal available for deeper analysis.

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Key Features

• IEPE sensor excitation — Provides constant-current power for piezoelectric accelerometers; simplifies field wiring and improves noise immunity.
• 4–20 mA proportional output — Sends a scaled RMS or peak value to DCS/PLC for trending and thresholds, typically configurable to match your engineering units.
• Buffered dynamic output — Preserves the full AC waveform for diagnostics or route-based analysis; handy for portable analyzers during outages or startups.
• Filtering and scaling — High-pass/low-pass filtering and gain options (factory set by build code) reduce low-frequency drift or unwanted bands.
• Industrial 24 VDC power — Typically powered from a 24 VDC cabinet supply for easy integration and redundancy schemes.
• Robust, cabinet-ready design — Designed for continuous use in machinery protection and condition monitoring environments.

“We paired an EA402 with two IEPE accelerometers on a critical pump. The plant kept a 4–20 mA feed into the DCS while maintenance plugged into the buffered output for FFT checks. Installation was fast and the noise floor seemed lower than the old conditioner.”

Technical Specifications

Related or Supporting Products

• VIBRO-METER TQ402 (charge amplifier) — For charge-output accelerometers in high-temperature applications; pairs when IEPE is not feasible.
• VIBRO-METER VM600 Mk2 — Rack-based protection and condition monitoring; the EA402’s 4–20 mA can be paralleled to DCS while VM600 handles trip logic and advanced analytics.
• IEPE industrial accelerometers — Standard 100 mV/g or 500 mV/g types for pumps, fans, and gearboxes; select ranges to match the EA402 scaling.
• Phoenix Contact QUINT4-PS/1AC/24DC/5 — Stable 24 VDC DIN-rail power supply; good choice for redundant EA402 power rails.
• Shielded sensor cabling (e.g., Belden low-noise coax) — Reduces triboelectric noise for the buffered dynamic output; keep runs short where possible.

Installation & Maintenance

• Cabinet & environment — Mount in a ventilated control cabinet (IEC 61439 practices). Keep away from high-EMI sources and VFD cabling; maintain ambient within the specified industrial range.
• Wiring — Use shielded cable for IEPE inputs and the buffered output. Ground shields at one end only to avoid loops. Separate low-level sensor leads from power lines.
• Power — Feed from a clean 24 VDC supply; in many cases a dedicated, fused rail with surge protection improves long-term stability.
• Configuration — Confirm the scaling (engineering units), filter cutoffs, and alarm thresholds match your machine. The 913-402-000-012 build is typically factory-set; we can verify against your datasheet.
• Routine checks — Quarterly sensor bias checks and a functional bump test help spot wiring or sensor issues. Re-verify loop scaling annually; clean terminals and re-torque connections.
• Serviceability — Buffered output lets you plug in a portable analyzer without disturbing the control loop, which saves time during outages.

Quality & Certifications

• CE marking for industrial EMC and safety (typical for EA-series modules)
• RoHS compliance
• Manufactured under ISO 9001 quality management
• Manufacturer’s standard warranty practices apply; we provide 365-day warranty coverage on supply

You might notice that plants standardizing on EA402 appreciate the simple recipe: IEPE in, 4–20 mA out, waveform always available. If you’re matching a legacy installation, share a photo of the module label and your sensor type — we’ll confirm compatibility with 913-402-000-012 and have it on the way by express.