Otseins AS7240B Benchtop Ultrasonic Cleaner

Overview

The Otseins AS7240B is a benchtop ultrasonic cleaner engineered for precision cleaning of delicate laboratory components—including glassware, pipette tips, microcentrifuge tubes, optical lenses, semiconductor wafers, and small mechanical parts—where particulate removal, solvent-assisted contaminant dissolution, and consistent cavitation energy delivery are critical. It operates on the principle of piezoelectric transduction: high-frequency electrical signals (40, 50, or 60 kHz) drive ceramic transducers bonded to the stainless steel tank base, generating controlled acoustic pressure waves in the cleaning medium. These waves induce transient microcavitation—formation, growth, and implosive collapse of microscopic vapor bubbles—which produces localized shear forces and microjetting effects capable of dislodging sub-micron contaminants without mechanical abrasion. The tri-frequency capability allows users to optimize cleaning efficacy across diverse sample geometries and soil types: lower frequencies (40 kHz) deliver higher cavitation intensity for robust particulate removal; mid-range (50 kHz) balances intensity and uniformity for general-purpose labware; and higher frequency (60 kHz) provides finer, more distributed energy ideal for fragile surfaces and fine-pore structures.

Key Features

• Digital microprocessor-controlled timer with 1–999 minute range and automatic shutdown—enabling reproducible, unattended operation for extended cleaning cycles.
• Continuous 1–100% ultrasonic power adjustment via rotary encoder, permitting precise energy modulation to avoid sample damage during sensitive cleaning protocols.
• Integrated degassing mode: temporarily suspends ultrasonic output while circulating liquid to remove dissolved air—reducing bubble interference and enhancing cavitation efficiency at startup.
• Stainless steel (304 grade) tank and housing ensure corrosion resistance, long-term structural integrity, and compatibility with aqueous, alcoholic, and mild alkaline cleaning solutions.
• Acoustically damped hinged lid minimizes airborne noise emission (<65 dB(A) at 1 m) and prevents solvent evaporation during operation.
• Manual drain valve located at the tank base enables rapid, residue-free solution exchange without tipping or siphoning.
• Standard accessories include a perforated stainless steel mesh basket and non-slip rubber feet for stable placement on vibration-sensitive workbenches.

Sample Compatibility & Compliance

The AS7240B accommodates standard laboratory vessels up to 135 mm in length and 100 mm in depth, supporting common formats such as 50 mL centrifuge tubes, Petri dishes (up to 100 mm), microscope slides, and small electronic assemblies. Its open-bath configuration permits immersion of irregularly shaped items not suitable for rack-based cleaners. While the unit lacks integrated temperature control, it is compatible with external water baths or thermostatic circulators when heated cleaning is required. Designed and tested to meet CE marking requirements under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD), the AS7240B conforms to IEC 61010-1:2010 for safety in laboratory equipment and IEC 61000-6-3:2019 for electromagnetic emissions. It supports GLP-compliant documentation workflows through manual log entry of time, frequency, and power settings—though it does not implement FDA 21 CFR Part 11 audit trails or electronic signature functionality.

Software & Data Management

The AS7240B operates via an embedded digital control panel with LED display—no external software, drivers, or connectivity (USB/Bluetooth/Ethernet) is provided or required. All operational parameters (frequency selection, power level, timer value) are set directly on-device and retained in non-volatile memory across power cycles. No firmware updates, remote monitoring, or data export capabilities are available. This architecture prioritizes operational simplicity, reliability, and immunity to cybersecurity vulnerabilities associated with networked instruments—making it suitable for regulated environments where deterministic behavior and minimal validation burden are essential. Users maintain full traceability by recording settings manually in lab notebooks or LIMS-compatible spreadsheets.

Applications

• Routine decontamination of HPLC vials, GC autosampler trays, and syringe filters prior to analytical runs.
• Removal of polishing compounds and organic residues from optical components used in spectroscopy and microscopy.
• Cleaning of MEMS devices, printed circuit boards (PCBs), and solder paste stencils in R&D prototyping labs.
• Preparation of cell culture flasks and bioreactor components to eliminate biofilm precursors before sterilization.
• Supporting ASTM D2621 (standard test method for ultrasonic cleaning effectiveness) and ISO 13485-aligned cleaning validation protocols in medical device manufacturing support labs.

FAQ

Does the AS7240B support heating or temperature regulation?
No. The unit does not incorporate a built-in heater or temperature sensor. For thermally assisted cleaning, external heating sources must be used.
Can multiple frequencies be active simultaneously?
No. Only one frequency (40, 50, or 60 kHz) may be selected at a time via the front-panel switch.
Is the drain valve self-sealing and corrosion-resistant?
Yes. The manual brass drain valve features PTFE-sealed threads and is rated for continuous use with water, ethanol, isopropanol, and pH-neutral aqueous detergents.
What is the expected transducer service life under normal laboratory usage?
Based on accelerated lifetime testing per IEC 60068-2-64, the piezoelectric transducers are rated for ≥20,000 hours of cumulative operation at ≤80% nominal power.
Does Otseins provide calibration certificates or IQ/OQ documentation?
Factory calibration verification is performed for timer accuracy (±0.5%) and power output linearity (±3% full scale); formal IQ/OQ packages are available upon request as a paid service add-on.