22L Lab Ultrasonic Bath Cleaner for Instruments & Equipment | 28/40kHz Dual Frequency Sonicator

The K820HTDS is a 22-liter lab ultrasonic bath built around a genuine dual-frequency ultrasonic cleaner. It delivers two distinct operating frequencies—28kHz and 40kHz—from the same sonicator bath, selectable at the press of a button. This is not a blended or simulated mode; the generator and transducer array are engineered to generate authentic cavitation at both frequencies. For laboratories that process instrument trays, glassware, and small equipment across different cleaning intensities, switching between the two means one machine handles the full workload without compromise.

This 22L ultrasonic cleaning bath measures 500×300×150mm, an elongated format that accommodates long glassware, instrument cassettes, and multiple smaller items in a single batch. A 480W ultrasonic output with 5–100% adjustable power, an 800W heater capable of maintaining up to 100°C, and automatic sweep frequency come standard. A front-mounted drain tap simplifies solution changes—practical for a tank that holds over 20 kilograms of liquid when full.

• True 28/40kHz Dual Frequency — Switchable output with authentic cavitation characteristics at both settings.
• 480W Ultrasonic Power (5–100% Adjustable) — Highest wattage in the benchtop dual frequency series; sufficient cavitation density for the 22L volume.
• 800W Heater (0–100°C) — Industrial-capacity heating for large-volume temperature control.
• Automatic Sweep Frequency — Uniform energy distribution across the 500mm tank length at both frequencies.
• Drain Tap — Standard for practical solution changes.
• Digital Controls with Continuous Run — Full parameter control and extended-run capability.

• Stainless steel instrument trays and surgical sets
• Heavily soiled laboratory glassware with baked-on residues
• Robust metal lab tools, clamps, and stands
• Reactor components and mechanical parts with carbon deposits

• Volumetric glassware, cuvettes, and thin-walled apparatus
• Delicate precision instruments and optical components
• Sample sonication and dissolution assistance
• HPLC mobile phase degassing and general sample preparation

• Shared facilities where different users need different cleaning intensities
• Clinical labs are processing both robust and delicate instrument loads
• Research groups with diverse daily protocols

What’s Included

• K820HTDS 22L dual frequency ultrasonic bath
• Stainless steel cleaning basket
• Stainless steel lid
• Power cable

Parameter	Specification
Model	K820HTDS
Volume	22 Litres
Ultrasonic Power	480W
Dual Frequency	28KHz and 40kHz (user-selectable)
Heating Power	800W
Temperature Range	0–80°C
Timer	1–99 min digital
Features	Adjustable power, Sweep frequency, Drain tap
Internal Tank Size	500 x 300 x 150 mm
Overall Size	550 x 330 x 330 mm
Carton Box Size	630 x 410 x 440 mm
Gross Weight	15.0 kg

Try more ultrasonic baths with various features, including mechanical knob control, adjustable power, sweep frequency, and dual-frequency series.

Apart from the 22L lab ultrasonic bath in the KHTDS series, there are more volume and dimension options of the dual frequency ultrasonic cleaners. Before you buy an ultrasonic cleaner, please check if the internal tank size fits your cleaning items.

Explore More Dual-Frequency Series

A fixed-frequency ultrasonic bath does one type of cleaning well and compromises on everything else. A 28kHz-only machine is aggressive on robust instruments but too harsh for delicate glassware. A 40kHz-only machine is gentle and precise but slow to strip heavy contamination from stainless steel trays and heavily soiled lab tools.

The K820HTDS eliminates this trade-off. The frequency selector puts both cleaning modes in the same benchtop unit:

• 28kHz — Larger cavitation bubbles implode with more mechanical force. Use for stainless steel instrument trays, heavily soiled glassware, robust lab tools, and components with baked-on residues or carbon deposits.
• 40kHz — Smaller, denser cavitation bubbles provide a gentler but more pervasive cleaning action. Use for volumetric glassware, cuvettes, delicate instruments, sample sonication, and items with fine surface features that aggressive cavitation could erode.

The 5–100% adjustable power operates independently of the frequency setting. You can run 28kHz at reduced power for moderately soiled robust items, or 40kHz at full power for maximum gentle cleaning intensity. This combination—two frequencies, variable power, and sweep—means the bath adapts to the task at hand rather than the other way around.

Q: Does the sweep function work differently at 28kHz versus 40kHz?

The sweep function operates on the same principle at both frequencies—shifting the output within a narrow band around the center frequency—but the sweep range is proportionally adjusted. At 28kHz, the sweep band might be approximately ±1.5kHz; at 40kHz, approximately ±2kHz. In practice, you do not need to configure anything; the generator handles this automatically. The result is uniform cavitation at both frequencies.

Q: Can I switch frequencies mid-cycle?

It is recommended to stop the ultrasonics before switching frequencies to avoid a momentary mismatch between the generator output and the transducer resonance. Press stop, switch frequency, and press start again. The transition takes only a few seconds and does not affect the cleaning outcome.

Q: When should I choose 28kHz over 40kHz for lab work?

Use 28kHz when cleaning robust stainless steel instruments, trays, and glassware with heavy soiling, baked-on residues, or carbon deposits. The larger cavitation bubbles deliver more mechanical impact, stripping contamination faster. If you are unsure which frequency to use, start with 40kHz at moderate power and inspect the result. You can always switch to 28kHz for a second cycle if heavier cleaning is needed.