Yarong B-220 Constant-Temperature Water Bath

Overview

The Yarong B-220 Constant-Temperature Water Bath is a precision-engineered laboratory thermal platform designed for stable, uniform, and reproducible temperature control in aqueous environments. Operating on the principle of direct resistive heating via a fully submerged annular stainless steel heating element, the unit delivers rapid thermal equilibration and minimal temperature gradient across the bath volume. Its PTFE-coated stainless steel inner tank ensures long-term corrosion resistance against repeated exposure to water, buffer solutions, and mild chemical reagents—critical for sustained operational integrity in QC labs, academic research settings, and routine analytical workflows. Engineered specifically as a thermal companion for Yarong’s RE-52 series rotary evaporators (including RE-52CS-1 and RE-52CS-2), the B-220 also serves as a standalone water bath for enzymatic assays, cell culture sample warming, reagent pre-equilibration, and dissolution testing where precise, non-contact heating is required.

Key Features

• PTFE-coated stainless steel inner bath (220 × 115 × 180 mm) resistant to oxidation, scaling, and chemical degradation
• Fully submerged annular heating element for efficient heat transfer and reduced thermal inertia
• Digital microprocessor-based temperature controller with built-in platinum RTD sensor (±0.5°C stability at setpoint)
• Wide operational range from ambient +5°C to 100°C, suitable for both low-temperature incubation and boiling-point applications
• 1000 W heating capacity enabling rapid recovery after sample loading or temperature setpoint changes
• Compact footprint (570 × 330 × 220 mm) optimized for benchtop integration without compromising 22 L usable volume
• Over-temperature protection circuit and grounded chassis design compliant with IEC 61010-1 safety requirements

Sample Compatibility & Compliance

The B-220 accommodates standard laboratory glassware including round-bottom flasks (up to 5 L), beakers, test tubes, and immersion probes. Its open-bath configuration supports direct placement of vessels or integration with external circulation manifolds. The unit meets basic electrical safety standards per IEC 61010-1 for laboratory equipment and conforms to RoHS Directive 2011/65/EU for hazardous substance restrictions. While not certified for GMP or GLP-regulated environments out-of-the-box, its stable thermal performance and traceable temperature control make it suitable for method development, training, and non-critical quality control procedures under internal lab SOPs. Calibration verification can be performed using NIST-traceable thermometers or digital probe standards.

Software & Data Management

The B-220 operates via an embedded digital controller with LED display and tactile push-button interface—no external software or PC connectivity is provided. Temperature setpoints, real-time bath readings, and status indicators (heating active, over-temp alarm) are displayed locally. The controller supports manual calibration offset adjustment (±2.0°C range) to align with reference instrumentation. For laboratories requiring audit trails or electronic records, third-party data loggers (e.g., Omega OM-DAQPRO-5300 or Testo 176 T4) may be interfaced via analog output (0–5 V or 4–20 mA) using optional signal adapters—enabling integration into LIMS or ELN systems where permitted by local validation protocols.

Applications

• Thermal activation of enzymes and proteins prior to kinetic assays
• Stabilization of reaction mixtures during DNA ligation, restriction digestion, or PCR setup
• Controlled evaporation support for rotary evaporator systems (RE-52CS series)
• Pre-warming of culture media, agarose gels, and electrophoresis buffers
• Dissolution profile testing of solid dosage forms under USP conditions (when paired with validated sampling apparatus)
• Calibration of temperature-sensitive sensors and transducers
• General-purpose heating of solvents, standards, and calibration solutions in wet chemistry labs

FAQ

Is the B-220 compatible with external temperature controllers or PID feedback loops?
Yes—the unit provides unregulated DC voltage output for optional external monitoring; however, closed-loop PID control requires integration via third-party hardware due to absence of native analog/digital communication ports.
Can the bath be used with organic solvents such as ethanol or acetone?
Not recommended. The PTFE coating resists aqueous corrosion but does not guarantee compatibility with aggressive organic solvents; prolonged exposure may compromise seal integrity and heater insulation.
What is the typical temperature uniformity across the bath volume?
Measured uniformity is ≤ ±0.8°C at 37°C and ≤ ±1.2°C at 95°C (per ASTM E1112-20 Annex A1 methodology), verified at five radial points within the working zone.
Does the unit include a drain valve for easy maintenance?
No—draining requires manual tilting or siphoning. Users should plan for periodic descaling using diluted acetic acid or commercial descalers to maintain thermal efficiency.
Is CE or UL certification available for this model?
The B-220 carries CCC (China Compulsory Certification) and complies with GB 4793.1–2007; CE marking is not affixed, and UL listing is not applicable for this configuration.