20kHz 4.5L Low Frequency Ultrasonic Bath – 300W Variable Power with Degas, Sweep & Pulse
$460.00 piece
Compact 4.5L 20kHz low frequency ultrasonic cleaner with 300W power, degas & sweep for algae disruption, sludge processing & stubborn grease removal.
| Quantity | Price | Discount |
|---|---|---|
| 2-20 | $437.00 piece | 5% |
| 21-100 | $414.00 piece | 10% |
| 101+ | $391.00 piece | 15% |
Shipping & Delivery
-
Express Air Delivery
Door-to-door with tracking
7-15 Business Days
Calculated at checkout
-
Standard Ocean Freight
Best for bulk & heavy cargo
25-35 Business Days
Calculated at checkout
-
Warranty 1 year
-
Free 30-Day returns
Specification
Overview
| Model | GNLH0304-20 |
|---|---|
| Brand | Granbo |
| Manufacturer | Granbo Technology Industrial Shenzhen Co., Ltd. |
| Origin | China |
| Capacity | 4.5L |
| Frequency | 20kHz |
| Power | 0-300W |
| Tank Material | 3.0mm Heavy-Duty SUS304, SUS304 Stainless Steel |
| Housing Material | SUS201 Stainless Steel |
| Function | Degassing, Digital Control, Heating, Noise Reduction, Power Adjustable, Pulse, Semiwave, Sweep, Timer |
| Heater | RT~80°C |
| Timer | 1-9999s |
| Tank Size(mm) | 300 x 150 x 100 |
| Unit Size(mm) | 400 x 210 x 220 |
| Voltage | 100V-120V ~ 60Hz / 220V-240V ~ 50Hz |
| Plug Type | AU Plug, EU Plug, Other Plugs, UK Plug, US Plug |
| Warranty | 1 Year |
| Customization | 485 Port, Frequency, Logo/Pattern, PLC System, Tanks Numbers |
| Certificates | CE, FCC, ISO 9001, RoHS |
| Applications | Cell Disruption, Cleaning, Degassing, Degreasing, Emulsification, Heavy-Duty Cleaning, Homogenization, Liquid Extraction, Mixing, Powder Dispersion, Rust Removal, Separation, Washing |
Packaging
| Chargeable Weight | 16.36 kg |
|---|---|
| Package Dimensions | 50 × 27 × 28 cm |
Description
Physical Advantages of 20kHz Low Frequency Cavitation
Operating at an ultra-low 20kHz acoustic frequency, this ultrasonic system produces an extended sound wavelength of roughly 72.5mm in liquid, generating intense mechanical forces that outperform standard 40kHz units in demanding physical tasks:
- Macro-Bubble Collapse & Mechanical Shearing: Lower frequencies expand the volume of individual cavitation bubbles. When these macro-bubbles implode, they produce violent shockwaves and localized liquid jets, tearing apart hardened, high-adhesion surface contaminants with ease.
- Aggressive Action for Tough Contaminants: The 20kHz acoustic profile is specifically suited for breaking down stubborn contaminants like thick oil layers, baked-on grease, scale, heavy rust, carbon deposits, and industrial polishing wax.
- High-Energy Environmental & Chemical Sonication: The vigorous liquid displacement generated at 20kHz makes this system ideal for complex fluid sonochemistry—including algae disruption, sludge processing, cell disruption, emulsification, liquid extraction, and powder dispersion.
- Heavy-Duty Tank Engineering & Power Control: To endure the intense impact of 20kHz cavitation, the bath is built with an ultra-thick 3.0mm SUS304 stainless steel inner tank. Users can easily modulate energy output using the 0–300W variable power control, Degas mode, and Sweep/Pulse functions to adapt to sensitive media.
Practical Applications & Load Suitability for 4.5L Capacity
The 4.5L capacity offers a balanced working volume ideal for targeted hardware restoration and multi-sample beaker sonication:
- Durable Metallic & Synthetic Hardware:
- Machined & Automotive Parts: Heavy steel bolts, fuel nozzles, industrial valves, sturdy gears, cutting tools, and engine fittings needing deep heavy grease removal or rust removal.
- Engineered Resins: Rigid synthetic components composed of ABS, PVC, PP, and durable polymers.
- Beaker Sonication & Fluid Handling (Indirect Cavitation):
- Laboratory Glassware & Beakers: Easily holds 5mL to 500mL beakers and sample flasks for indirect liquid extraction, algae disruption, sludge processing, emulsification, and powder dispersion, keeping sample media isolated from the main tank.
- Substrate Protection Guidance:
- Due to the aggressive shockwaves generated by 20kHz, delicate substrates (such as gold, brass, aluminum, or thin glass) should be processed at reduced output using the 0–300W power control or engaged via Sweep/Pulse modes to cushion physical surface stress.
Control Panel Overview
Control Button Guide
Sweep Frequency Technology Overview
Pulse Mode Overview
Granbo PCB vs. Standard Ultrasonic Cleaner PCB
Multi-Layer Noise Reduction Design
Box Contents:
- 1 x Professional Ultrasonic Cleaner
- 1 x Durable Mesh Cleaning Basket
- One cover, one power cord, one manual warranty card certificate of conformity.
Packing type:
- One unit filled with thick foam, then standard export corrugated carton or wooden box.
Real Customer Feedback
Support & FAQ
Frequency determines cavitation bubble size, impact force, and penetration depth. Lower frequencies produce violent impact for heavy dirt, while higher frequencies provide dense, gentle cleaning for sub-micron microstructures:
Granbo Recommended Frequency Matrix:
• 28kHz: Heavy oil, scale, rust, polishing wax, cutting dust, and thick contaminants (>10μm) on heavy metal/resin parts.
• 40kHz: Universal choice for standard labware, stainless steel, glass, and general maintenance (>10μm particles).
• 68kHz / 80kHz: Fine cleaning for PCBs, watch components, optics, medical instruments, and micro-grooves (5–10μm particles).
• 120kHz: Precision cleaning for micro-blind holes (<0.1mm), semiconductors, ICs, optical lenses, and MEMS (1–5μm particles).
• 200kHz: Ultra-precision cleaning for silicon wafers, MEMS, thin films, and sub-micron / nano-scale contamination (<1μm).
• 28kHz: Heavy oil, scale, rust, polishing wax, cutting dust, and thick contaminants (>10μm) on heavy metal/resin parts.
• 40kHz: Universal choice for standard labware, stainless steel, glass, and general maintenance (>10μm particles).
• 68kHz / 80kHz: Fine cleaning for PCBs, watch components, optics, medical instruments, and micro-grooves (5–10μm particles).
• 120kHz: Precision cleaning for micro-blind holes (<0.1mm), semiconductors, ICs, optical lenses, and MEMS (1–5μm particles).
• 200kHz: Ultra-precision cleaning for silicon wafers, MEMS, thin films, and sub-micron / nano-scale contamination (<1μm).
Based on Granbo multi-frequency switchable configurations (Single/Dual/Triple/Quad), we recommend:
| Process | Recommended Frequency | Application Context |
|---|---|---|
| Dispersion | 17-28kHz / 40kHz / 120kHz | 17-28kHz for coarse solid chunks; 40kHz for powders; 120kHz for micro/nano suspensions. |
| Emulsification | 28kHz / 40kHz | 28kHz generates stronger shear force for heavy liquid blending. |
| Extraction | 40kHz / 120kHz | 120kHz is standard for intracellular substance extraction and cell disruption. |
| Mixing/Catalysis | 40kHz / 120kHz | 40kHz for routine mixing; 120kHz for micro-particle homogenization. |
| Synthesis | 80kHz / 120kHz | Prevents molecular degradation during material synthesis. |
| Environmental | 20kHz | High-power sonication for sludge treatment, sewage, and algae disruption. |
To resist cavitation erosion, Granbo customizes tank thickness and welding based on operating frequency:
| Frequency Range | Inner Tank (SUS304) | Outer Shell | Common Tank Capacities & Process |
|---|---|---|---|
| 28kHz - 200kHz | 1.5 mm Thickness | SUS304 (1.0 mm) | 3–10L, 14–22L, 30–58L, 61–135L. Industrial precision stamping & TIG welding. |
| 25kHz | 2.0 mm Thickness | SUS201 (1.0 mm) | Thickened tank; Manual oxy-acetylene heavy welding. |
| 17kHz & 20kHz | 3.0 mm Thickness | SUS201 (1.0 mm) | Ultra-thickened tank; Manual oxy-acetylene heavy welding. |
*Material Safety Tip: Soft metals (aluminum, brass, gold) and delicate glass/ceramics may scratch or fracture at 28kHz. We recommend 40kHz to 80kHz or pre-testing for delicate substrates.
When a workpiece has both stubborn contaminants and sub-micron precision requirements, use a multi-stage approach:
- Stage 1 (Pre-cleaning / 28kHz or 40kHz): Strips heavy grease, rust, polishing paste, scale, or coarse metal particles.
- Stage 2 (Fine Cleaning / 68kHz or 80kHz): Removes fine particles (5–10μm) from blind holes, threads, and complex internal geometry.
- Stage 3 (Ultra-Precision Rinse / 120kHz or 200kHz): Eliminates sub-micron (<1μm) residues without damaging fragile surfaces or thin films.
- Sweep Mode: Automatically sweeps ±1kHz around the center frequency to eliminate standing waves, ensuring uniform cavitation across the bath.
- Degas Mode: Uses pulsed ultrasound intervals (e.g., 5s on / 5s off) to purge dissolved air/gas from liquids—crucial for HPLC sample prep and max cavitation efficiency.
- Pulse Mode: Rapidly cycles power from 100% to 0% to produce a "blasting" impact that removes tough or baked-on residues.
Granbo units utilize Full-Bridge Separately Excited PCB Driver Boards rather than cheap self-excited circuits:
- Visualized Real-time Data: Displays live Power, Frequency, and Current for strict laboratory protocol logging.
- High Power Density: Guarantees a standard ≥ 0.3W/cm² for thorough cleaning. Power Density = Ultrasonic Power (W) / Radiating Area (cm²)
- Low Noise Operation: While 28kHz operation naturally produces more audible mechanical noise, Granbo's multi-layer noise-reduction design enables high-frequency units (≥68kHz) to operate at noise levels below 80dB.
Ultrasonic frequency determines sound wavelength and cavitation bubble collapse intensity:
Wavelength (λ) = 1,450,000 (mm/s) / Frequency (Hz)
- 20kHz (λ ≈ 72.5mm): Large bubbles, high collapse force. Best for heavy rust, sludge, and thick scale.
- 40kHz (λ ≈ 36.2mm): Medium bubbles. Ideal balance between cleaning power and component safety.
- 120kHz (λ ≈ 12.0mm): Micro bubbles. High penetration depth for sub-micron cracks and fragile silicon/semiconductor parts.
Beaker Size Matching:
• Beaker ≤ 500mL → 3.2L to 6.5L Tank.
• Beaker ≥ 800mL → 10L to 30L Tank (10L is the most popular size for general lab applications).
Temperature Management:
Ultrasonic activity inherently raises liquid temperature. Although Granbo heating goes up to 80°C, cavitation effectiveness drops significantly above 72°C–80°C due to increased vapor pressure. For temperature-sensitive or low-temp processes, use cooling coils or ice packs in the bath.
Standard production lead times for out-of-stock or customized Granbo models:
- 28kHz - 200kHz Models (Single, Dual, Triple, Quad Frequency): 3 - 5 business days for shipping.
- Ultra-Low Frequency (17kHz, 20kHz, 25kHz): 14 - 20 business days for shipping.
*Note: Customizations like RS-485 communication or PLC integration may slightly adjust delivery timelines. Contact us for precise scheduling.
More Models & Specifications
Click a model name to view its corresponding product page and detailed specifications.
20kHz Series
| Model | Transducers
(PCS) |
Capacity
(L) |
Tank Size
(LxWxH mm) |
Unit Size
(LxWxH mm) |
Frequency
(kHz) |
Ultrasonic Power
(W) |
Heating Power
(W) |
Temp.
(C) |
Timer
(S) |
| GNLH0203-20 | 2 | 3.2 | 240x135x100 | 340x195x320 | 20 | 0-200 | 300 | 20-80 | 1-9999 |
| GNLH0205-20 | 2 | 4.8 | 240x135x150 | 340x195x370 | 20 | 0-200 | 300 | 20-80 | 1-9999 |
| GNLH0304-20 | 3 | 4.5 | 300x150x100 | 400x210x220 | 20 | 0-300 | 450 | 20-80 | 1-9999 |
| GNLH0306-20 | 3 | 6.5 | 300x150x150 | 400x210x370 | 20 | 0-300 | 450 | 20-80 | 1-9999 |
| GNLH0610-20 | 6 | 10 | 300x240x150 | 400x300x370 | 20 | 0-600 | 600 | 20-80 | 1-9999 |
| GNLH0614-20 | 6 | 14 | 300x240x200 | 400x300x420 | 20 | 0-600 | 600 | 20-80 | 1-9999 |
| GNLH0815-20 | 8 | 15 | 330x300x150 | 430x360x370 | 20 | 0-800 | 1000 | 20-80 | 1-9999 |
| GNLH0819-20 | 8 | 19 | 330x300x200 | 430x360x420 | 20 | 0-800 | 1000 | 20-80 | 1-9999 |
| GNLH1422-20 | 14 | 22 | 500x300x150 | 600x360x380 | 20 | 0-1400 | 1000 | 20-80 | 1-9999 |
| GNLH1430-20 | 14 | 30 | 500x300x200 | 600x360x430 | 20 | 0-1400 | 1000 | 20-80 | 1-9999 |
4.5L Capacity
| Model | Transducers (PCS) |
Capacity (L) |
Tank Size (L×W×H mm) |
Unit Size (L×W×H mm) |
Frequency (kHz) |
Ultrasonic Power (W) |
Heating Power (W) |
Temp. (°C) |
Timer (S) |
|---|---|---|---|---|---|---|---|---|---|
| GNLH0304-17 | 3 | 4.5 | 300×150×100 | 400×210×220 | 17 | 0–180 | 450 | 20–80 | 1–9999 |
| GNLH0304-20 | 3 | 4.5 | 300×150×100 | 400×210×220 | 20 | 0–300 | 450 | 20–80 | 1–9999 |
| GNL0404-25 | 4 | 4.5 | 300×150×100 | 400×210×220 | 25 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0304-28 | 3 | 4.5 | 300×150×100 | 325×175×290 | 28 | 0–150 | 450 | 20–80 | 1–9999 |
| GL0304-33 | 3 | 4.5 | 300×150×100 | 325×175×290 | 33 | 0–150 | 450 | 20–80 | 1–9999 |
| GL0304-40 | 3 | 4.5 | 300×150×100 | 325×175×280 | 40 | 0–150 | 450 | 20–80 | 1–9999 |
| GL0404-40 | 4 | 4.5 | 300×150×100 | 325×175×280 | 40 | 0–200 | 450 | 20–80 | 1–9999 |
| GLS0804-50 | 8 | 4.5 | 300×150×100 | 325×175×280 | 50 | 0–240 | 450 | 20–80 | 1–9999 |
| GLS0804-53 | 8 | 4.5 | 300×150×100 | 325×175×280 | 53 | 0–280 | 450 | 20–80 | 1–9999 |
| GL0404-68 | 4 | 4.5 | 300×150×100 | 325×175×290 | 68 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0404-80 | 4 | 4.5 | 300×150×100 | 325×175×280 | 80 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0404-120 | 4 | 4.5 | 300×150×100 | 325×175×280 | 120 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0404-130 | 4 | 4.5 | 300×150×100 | 325×175×280 | 130 | 0–240 | 450 | 20–80 | 1–9999 |
| GLS0804-200 | 8 | 4.5 | 300×150×100 | 325×175×280 | 200 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0304-2840 | 3 | 4.5 | 300×150×100 | 325×175×290 | 28/40 | 0–150 | 450 | 20–80 | 1–9999 |
| GL0404-4068 | 4 | 4.5 | 300×150×100 | 325×175×290 | 40/68 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0404-4080 | 4 | 4.5 | 300×150×100 | 325×175×280 | 40/80 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0404-40120 | 4 | 4.5 | 300×150×100 | 325×175×280 | 40/120 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0404-80120 | 4 | 4.5 | 300×150×100 | 325×175×280 | 80/120 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0404-4080100 | 4 | 4.5 | 300×150×100 | 325×175×280 | 40/80/100 | 0–200 | 450 | 20–80 | 1–9999 |
| GL0404-4080120 | 4 | 4.5 | 300×150×100 | 325×175×280 | 40/80/120 | 0–200 | 450 | 20–80 | 1–9999 |
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