Ultrasonic Transducer

FAQ

Q: What frequency ultrasonic transducer do I need for cleaning?

A: The right frequency depends on your cleaning application and the type of contaminants you need to remove:

**28 kHz** — Best for heavy industrial parts: engine blocks, gears, castings, and components with stubborn oil, rust, or buffing compound. Lower frequency produces larger cavitation bubbles with stronger cleaning force and deeper penetration.

**40 kHz** — The industry standard for general-purpose cleaning: machined parts, medical instruments, injection molds, and electronic components. Offers a balance of cleaning power and surface safety. This is the most common frequency in industrial ultrasonic cleaners worldwide.

**68–120 kHz** — For delicate precision parts: semiconductor wafers, optical lenses, and surgical instruments. Higher frequency creates smaller, gentler cavitation bubbles that clean without surface damage.

**Dual-frequency (28/40 kHz)** — When your production line handles varied parts, a dual-frequency transducer lets you switch between deep power and fine cleaning in a single tank.

**Rule of thumb:** The heavier the contamination and the more robust the part, the lower the frequency. The more delicate the part, the higher the frequency.

Explore our cleaning transducer range:

- 40kHz 60W Ultrasonic Cleaning Transducer 

- 40kHz 100W Ultrasonic Cleaning Transducer 

- 28kHz/40kHz Dual-Frequency Transducer 

Q: How to choose the right piezoelectric ceramic for your transducer?

The piezoelectric ceramic is the core component of every ultrasonic transducer—it converts electrical energy into mechanical vibration. Choosing the right piezo ceramic directly determines your transducer's performance, durability, and cost.

Key factors when selecting piezo ceramics:

1. **PZT Grade Selection:**

- **PZT-4 (Hard PZT):** Low dielectric loss, high power handling. Best for ultrasonic cleaning and welding transducers that run at high power for extended periods.

- **PZT-8 (Hard PZT, High Power):** Even lower loss than PZT-4. Ideal for continuous-duty heavy industrial cleaning and high-power ultrasonic processing.

- **PZT-5 (Soft PZT):** High dielectric constant, high sensitivity. Better for sensors and NDT probes where receiving sensitivity matters more than power transmission.

2. **Frequency Matching:** The ceramic must be sized and shaped to resonate at your target frequency. A 40 kHz transducer requires a different ceramic geometry than a 28 kHz unit.

3. **Size and Configuration:** Ring-shaped (annular) ceramics are most common in Langevin-type transducers. The diameter and thickness determine the resonant frequency and power output.

4. **Operating Temperature:** Standard PZT ceramics are rated for up to 250°C. For high-temperature applications, specialized formulations are required.

**Soner Tech's advantage:** We produce our own piezoelectric ceramics in-house with three sintering furnaces and a monthly capacity of 10,000+ pieces. We hold the formulations for PZT-4 and PZT-8, and can adjust the formulation to meet your custom frequency, size, and performance requirements.

View our Piezo Ceramic Transducer for Ultrasonic Cleaning 

Contact us to discuss your piezo ceramic specifications 

Q: How does an ultrasonic transducer work?

A: An ultrasonic transducer works on the **piezoelectric effect**—the ability of certain ceramic materials to convert electrical energy into mechanical energy and vice versa.

The process in 4 steps:

1. **Electrical Input:** An ultrasonic generator produces a high-frequency AC electrical signal (e.g., 40 kHz, matching the transducer's resonant frequency).

2. **Piezoelectric Conversion:** Inside the transducer, piezoelectric ceramic rings (typically PZT-4 or PZT-8) receive the electrical signal. The piezo material physically expands and contracts in response to the alternating voltage—at the same frequency as the input signal.

3. **Mechanical Amplification:** The piezo ceramic's micro-vibrations are transferred through a metal front mass (usually aluminum or titanium) and a back mass (steel), which together form a Langevin (sandwich) structure. This structure amplifies the vibration and couples it efficiently to the load.

4. **Ultrasonic Wave Emission:** The amplified mechanical vibration is transmitted into the surrounding medium—typically the cleaning liquid in the tank. This creates rapid pressure fluctuations that generate **cavitation**: millions of microscopic bubbles form and implode, releasing energy that dislodges contaminants from part surfaces.

Why frequency matters:

- Lower frequencies (20–28 kHz) produce larger, more energetic cavitation bubbles—stronger cleaning force.

- Higher frequencies (40–120 kHz) produce smaller, gentler bubbles—finer, more precise cleaning.

- In NDT applications (1–15 MHz), the transducer sends short ultrasonic pulses through materials and receives the echoes to detect internal flaws.

At Soner Tech, we manufacture the complete transducer assembly in-house—from piezo ceramic production to final housing and testing—ensuring full control over performance and quality.

Q:Who manufactures ultrasonic transducers in China?

A: Soner Tech (Shenzhen, China) is a professional ultrasonic transducer manufacturer with over 20 years of industry experience. We are not a trading company—we operate our own complete manufacturing facility.

What sets Soner Tech apart from other Chinese suppliers:

- **Vertically integrated manufacturing:** Unlike most transducer suppliers who assemble from purchased components, we produce our own piezoelectric ceramics (PZT-4, PZT-8), machine our own metal hardware, and assemble finished transducers in-house. Three sintering furnaces, monthly ceramic output of 10,000+ pieces.

- **ISO 9001 Certified Quality:** Our entire design and production process follows ISO 9001:2015 quality management protocols. Every transducer undergoes frequency, impedance, and power testing before shipment.

- **OEM/ODM capability:** We engineer custom transducers to your specifications—custom frequency, power, size, housing, and connector types. 7-day sample lead time.

- **Complete product range:**

- Ultrasonic cleaning transducers (28 kHz, 40 kHz, dual-frequency, 60W–200W)

- Ultrasonic beauty transducers (1 MHz, 3 MHz, dual-frequency)

- High-frequency NDT probes (up to 8 MHz dual-element)

- Low-frequency bolt-clamped Langevin transducers

- Piezoelectric ceramic elements (custom formulations available)

- **Global supply experience:** We serve industrial cleaning equipment manufacturers, beauty device brands, and NDT equipment providers worldwide.

How to verify a Chinese transducer manufacturer:

1. Ask for their ISO 9001 certificate (not just a claimed "ISO compliant")

2. Ask whether they produce their own piezo ceramics or purchase from third parties

3. Request a factory photo or video tour of the production line

4. Order a sample to test performance in your actual application

Contact Soner Tech|

View our product range 

Q: What is the difference between high-frequency and low-frequency ultrasonic transducers?

A:The difference between high-frequency and low-frequency ultrasonic transducers comes down to **wavelength, penetration depth, and application suitability.

In cleaning applications (the "low" end of the spectrum):

- **28 kHz:** Heaviest cleaning force—for large industrial parts with stubborn contamination

- **40 kHz:** Standard industrial cleaning—the most versatile and widely used

- **68–120 kHz:** Precision cleaning—for delicate parts where surface damage is a concern

In NDT applications (the "high" end):

- **1–5 MHz:** Deep penetration for thick steel, pipes, and pressure vessels

- **5–10 MHz:** Medium penetration for aerospace composites, precision welds

- **10+ MHz:** High resolution for thin materials, semiconductor wafers, medical imaging

**Dual-frequency cleaning transducers (28/40 kHz):** These combine the deep-cleaning power of 28 kHz with the finer cleaning capability of 40 kHz in a single unit—ideal for production lines that handle diverse part types.

- View our 8MHz High-Frequency NDT Transducer 

- View our 28kHz/40kHz Dual-Frequency Cleaning Transducer 

- View our Low-Frequency Transducers