I.Function

The function of the ultrasonic converter (ultrasonic transducer) is to convert electrical vibration into mechanical vibration.

This process is realized by means of the piezoelectric ceramic plates inside the housing (usually made of PZT4 and PZT8). Due to the inverse piezoelectric effect, these ceramic plates change their thickness when a voltage is applied. When alternating current is applied to the converter, the ceramic material expands and contracts, thereby generating vibration. If alternating current is applied within the natural frequency range of the converter, the converter will produce a sufficiently large amplitude and can be used as a pulse generator for the vibration unit.

Herrmann converters have rated frequencies of 20 kHz, 30 kHz and 35 kHz, with different insulation classes.

Fig 1 Example of Herrmann Ultrasonic Converters

II. Structure

Fig 2 Example Herrmann 35 kHz converters, without collar (A) and with collar (B)

[1] HF fitting
[2] Air fitting for converter cooling (with closure caps)
[3] Converter cover
[4] Support ring (different depending on the type of converter)
[5] Converter housing
[6] Converter neck
[7] Mating surface to the booster or sonotrode
[8] Collar (different depending on the type of converter)

III.Identification plate

Herrmann’s identification plate can be glued or permanently attached to the Herrmann converter housing by laser engraving.

Fig 3 Herrmann converter identification plate

[1] Type of component
[2] Converter type designation
[3] Converter nominal frequency
[4] Converter serial number
[5] Converter article number
[6] Version

IV.Protection Level

According to the conditions of the production environment, Herrmann ultrasonic converters have protection ratings of IP50, IP65, and IP67.

Difference in air flow between Haierman transducers IP50 and IP65

Fig 4 Airflow converters with open cooling circuit and closed cooling circuit

The converter can have one or two connectors mounted on the converter cover, and it can have an open or closed cooling circuit. The installation methods of the cooling devices also vary for different cooling circuit designs.

Fig 5 Examples of Herrmann converter cooling IP50

Fig 6 Examples of Herrmann converter cooling IP65

For many years, Altrasonic Technology has specialized in the repair, maintenance and replacement of Herrmann transducers. With a mature technical system and extensive on-site experience, we have become a reliable partner for numerous enterprises in dealing with core ultrasonic components of Herrmann.

We provide not only fault repair, but also highly compatible, cost-effective replacement transducers with matching performance and easy installation. This effectively reduces equipment downtime and lowers replacement costs.

We can stably repair and replace a wide range of common models, including: KHS35‑S‑IP65, KHS35‑D45‑W‑CMI/K, KHS30‑IP65‑L, KHS20‑IP50, CCS30‑IP50‑L, KHS35‑S‑IP65/67‑L‑GSS, CCS20‑S‑IP50‑L‑I, and more.

Would you like to check the detailed parameters, matching solutions and in-stock information for these models? Please visit our product page to get your customized solution.