Julabo SW23 Advanced Orbital Shaking Water Bath

Overview

The Julabo SW23 Advanced Orbital Shaking Water Bath is an engineered solution for laboratories requiring precise thermal control combined with reproducible orbital agitation in a single integrated platform. Designed and manufactured in Germany, the SW23 operates on the principle of PID-controlled resistive heating coupled with a dynamically balanced orbital shaking mechanism—enabling simultaneous temperature stabilization and uniform sample mixing under controlled thermal conditions. Its primary application domain includes cell culture incubation, enzymatic reaction kinetics, solubility studies, microbial growth assays, and stability testing in pharmaceutical, food safety, and materials science laboratories. The unit meets DIN 12876-1 Class 1 safety requirements for laboratory equipment using non-flammable bath media, and its robust architecture supports continuous operation under GxP-aligned workflows where traceability, repeatability, and system integrity are essential.

Key Features

• High-precision temperature regulation with ±0.02 °C stability at setpoint (measured at sensor location in standard operating configuration), achieved via primary PID algorithm and high-efficiency 2000 W stainless-steel immersion heating coil.
• Orbital shaking mechanism driven by a maintenance-free, brushless DC motor sourced from the same German OEM supplier used for Mercedes-Benz automotive wiper systems—ensuring long-term torque consistency and rotational accuracy across 20–200 rpm range.
• Corrosion-resistant mirror-polished stainless-steel inner bath chamber (AISI 316-grade equivalent) with seamless welded construction and integrated bottom drain valve for rapid, contamination-free fluid exchange.
• IP43-rated enclosure with fully sealed, membrane-type waterproof keypad and recessed power switch—permitting safe operation with wet hands and protection against incidental liquid splashes.
• Triple-layer thermal safety architecture: (1) dual independent temperature sensors positioned at different vertical levels to detect low-fluid conditions via >15 °C differential; (2) user-definable high/low sample temperature limits with audible and visual alerting; (3) hardwired overtemperature cutoff at 105 °C with automatic power disengagement.
• Self-diagnostic firmware that identifies and displays fault codes—including heater failure, motor stall, sensor drift, or communication timeout—enabling rapid root-cause resolution without external service tools.

Sample Compatibility & Compliance

The SW23 accommodates standard laboratory vessels—including glass and plastic test tubes (up to 50 mL), Erlenmeyer flasks (up to 2 L), separatory funnels, and custom jigs—via interchangeable mounting accessories. Its 8–20 L usable volume range supports scalable experiments while maintaining thermal homogeneity (±0.1 °C spatial uniformity verified per internal validation protocol). The unit complies with DIN 12876-1 Class 1 for equipment intended for use with non-flammable liquids only. It is compatible with water, silicone oil, and glycol-based heat-transfer fluids meeting ISO 8502-2 purity specifications. While not inherently 21 CFR Part 11 compliant out-of-the-box, audit-trail-capable data logging can be implemented via optional EASYTEMP software with electronic signature support when deployed on validated IT infrastructure.

Software & Data Management

The built-in RS232 interface enables bidirectional communication with host PCs running Julabo’s EASYTEMP software—a Windows-based application supporting real-time parameter monitoring, remote setpoint adjustment, scheduled ramp/soak profiles, and CSV-exportable time-series data capture (temperature, speed, alarm status). Optional Wi-Fi adapter modules allow networked deployment within institutional LANs, permitting centralized oversight of multiple units via browser-based dashboards. All onboard settings—including calibration offsets, alarm thresholds, and timer presets—are retained during power cycles. Firmware updates are delivered via USB flash drive and validated through cryptographic checksum verification prior to installation.

Applications

• Cell culture maintenance under defined thermal and agitation conditions to enhance oxygen transfer and prevent sedimentation in suspension cultures.
• Accelerated stability testing of APIs and formulated drug products per ICH Q1A(R2) guidelines, particularly for temperature-sensitive excipients.
• Enzyme activity profiling across defined thermal gradients, including Arrhenius plot generation and activation energy determination.
• Microbial enumeration and enrichment protocols requiring consistent thermal input and gentle mixing—such as coliform detection in food and beverage matrices per ISO 4832.
• Material dissolution rate analysis for polymer films, hydrogels, and controlled-release matrices under physiologically relevant shear and thermal environments.

FAQ

Does the SW23 support cooling functionality?
No—the SW23 is a heating-only unit. For applications requiring sub-ambient temperature control, Julabo recommends the SLB or F26 series refrigerated circulators paired with external shaker platforms.
Can the shaking motion be disabled independently of temperature control?
Yes—shaking and heating functions operate as fully decoupled subsystems. The orbital motor can be toggled on/off via front-panel keypress or remote command without interrupting thermal regulation.
Is factory calibration certificate included with shipment?
A traceable NIST-equivalent calibration report (covering temperature sensor and setpoint accuracy at 37 °C and 60 °C) is available upon request at time of order; it is not standard-supplied but may be added as a configurable option.
What is the maximum recommended fill level for optimal thermal uniformity?
For best performance, maintain fluid level between 8 L (minimum operational volume) and 18 L (optimal for 20 L nominal capacity); exceeding 18 L may reduce circulation efficiency and increase settling time.
Are third-party accessories (e.g., custom racks) supported?
Yes—Julabo provides dimensional drawings and mechanical interface specifications for OEM integration; all standard accessory mounting points conform to ISO 2768-mK general tolerances.