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Mandatory Verification of Audiometric Equipment

A hearing threshold is only meaningful if the audiometer that measured it is telling the truth. Verify the earphones against a reference ear, not just the electronics against a meter.

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Partial Discharge Diagnosis

Insulation doesn't fail all at once — it fails after months of tiny electrical discharges nobody heard. See where a switchgear cabinet or transformer is already breaking down, before it takes the circuit with it.

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A Failing Insulator Talks Before It Fails

Partial discharge is a small, localized electrical breakdown that happens where insulation has degraded — around a void, a contamination point, or a stressed joint — long before it grows into a full flashover or an outright fault. Each discharge event is a tiny spark that generates a burst of ultrasonic noise, well above the range a technician can hear on a routine walk-through.

Traditional partial discharge detection typically needs a specialized, contact-based instrument. An acoustic imager offers a different approach: it visualizes the ultrasonic signature from a safe distance, without needing to touch or de-energize the equipment, and shows exactly where on a panel or enclosure the activity is concentrated.

Aihua's YT2001 covers this with a dedicated PRPD (phase-resolved partial discharge) analysis mode, alongside its general acoustic imaging capability.



  • PRPD



    Phase-Resolved Partial Discharge analysis — characterizing discharge activity relative to the AC voltage phase, not just its overall level

  • 0.3–100 m

    Effective detection range, from a close-up panel check to scanning across a substation yard

                                             Three Places Insulation Breaks Down First

                                                                                              Partial discharge tends to concentrate at specific points in the electrical system — these are worth a routine, non-contact scan.

Switchgear & Panel Inspection

Routine scans of switchgear cabinets and distribution panels catch discharge activity at busbars, connections and insulators from outside the enclosure.

Transformers & Bushings

External acoustic scanning of transformer tanks and bushings identifies internal or surface discharge activity without an outage or intrusive testing.

Condition-Based Maintenance Rounds

Scheduled, non-contact scans across a substation or plant electrical room build a trend record, flagging developing faults before a scheduled outage catches them.

YT2001 Advanced Acoustic Imager

Running a Partial Discharge Survey

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    Plan the Route


    Identify switchgear, transformers and joints to cover, prioritizing aging assets and critical circuits.

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    Scan


    Sweep each asset from a safe distance and watch the overlay for any concentrated ultrasonic activity.

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    Classify with PRPD


    Switch to phase-resolved analysis on any flagged point to characterize the discharge pattern.

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    Log & Re-Check


    Record the finding and re-scan on a schedule, escalating any asset showing a worsening trend.

YT2001 Acoustic imager

YT2001 Advanced Acoustic Imager 

Capture steady-state and transient sound sources with a 25 FPS high-speed refresh rate — fast enough to track moving or fleeting sound events as they happen

Choose between 136-channel MEMS digital microphone arrays for precise, reliable sound source localization, even in complex industrial environments.

Adjustable frequency band filtering actively suppresses interference, so you get clean, accurate detection results even on noisy factory floors.

Don't just find gas leaks — measure them. Real-time leak rate calculation combined with intelligent auto-focusing locates and quantifies leakage sources in seconds.

Built-in real-time PRPD (Phase Resolved Partial Discharge) spectrum analysis helps electrical engineers detect insulation faults before they become failures.

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about us
T​​​​hree Decades Building the Reference Standards Themselves
Hangzhou Aihua Instruments has been designing and manufacturing acoustic and vibration measurement instruments since 1992 — including the calibrators recommended on this page. Our sound level meters and calibrators hold National Type Approval Certificates and are CE tested, and Aihua has drafted and co-drafted national standards for sound level meters, giving us a direct hand in the requirements these instruments are built to meet.

That combination — building both the measurement instruments and the calibration references behind them, under one roof — is what lets a sensor manufacturer source a production-line reference standard from the same company whose broader instrument line already meets the standards your customers expect.

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  •             Common Questions About Acoustic Gas Leak Detection

  • 1. Why can't I just listen for the leak myself?

  • 2. What gases does this work for?

  • 3. How accurate is the flow-rate estimate?

  • 4. Can this be used in a loud industrial environment?

Any questions? We look forward to hearing from you.

phone-5 Tel: +86-19012832378

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