Shanghai Yoke 501 Super Constant-Temperature Water Bath

Overview

The Shanghai Yoke 501 Super Constant-Temperature Water Bath is a precision-engineered laboratory thermal platform designed for stable, repeatable temperature maintenance across a wide operational range (ambient to 100 °C). It operates on the principle of resistive heating combined with active liquid circulation and digital proportional-integral-derivative (PID) feedback control. The bath chamber—constructed from high-grade imported stainless steel—resists oxidation, corrosion, and thermal degradation under prolonged exposure to aqueous or mildly aggressive media. Its thermally optimized geometry and integrated far-infrared heating elements minimize thermal inertia, enabling rapid heat-up and short thermal equilibrium times (<15 min from 25 °C to 80 °C under standard load). The system employs dual-integration analog-to-digital conversion and high-stability operational amplifiers to achieve precise setpoint tracking and low-drift temperature regulation—critical for applications demanding strict thermal reproducibility over extended durations.

Key Features

• Digitally controlled PID temperature regulation with LED display offering real-time setpoint and actual bath temperature readout (0.1 °C resolution)
• Far-infrared heating system engineered for uniform thermal distribution and reduced localized hot spots
• Integrated magnetic stirring mechanism (non-submersible, top-mounted) for enhanced convective homogeneity within the working fluid
• Stainless steel circulation pump delivering 6 L/min flow rate; configured exclusively for internal recirculation to maintain bath stability and prevent external contamination
• Robust chamber construction: 280 × 240 × 180 mm usable volume with 180 mm depth—optimized for compatibility with standard Erlenmeyer flasks, round-bottom flasks, and immersion-cooled condensers
• Thermal uniformity of ±0.5 °C across the full working volume at steady state, verified per ASTM E1112-22 guidelines for liquid bath performance validation

Sample Compatibility & Compliance

The 501 water bath accommodates a broad spectrum of sample containers—including glassware up to 2 L capacity—and supports both open-vessel processes (e.g., solvent evaporation, enzymatic incubation) and sealed-system configurations (e.g., jacketed reactor temperature control via external coil immersion). It is compatible with deionized water, glycol-water mixtures (up to 30% v/v), and silicone oils rated for ≤100 °C service. While not certified to IEC 61010-1:2019 Ed. 3 as a standalone Class II medical device, its electrical insulation, grounding continuity, and overtemperature cutoff (mechanical backup limiter at 110 °C) conform to general-purpose laboratory equipment safety expectations under ISO/IEC 17025-accredited environments. No CE or UKCA marking is affixed; users deploying this unit in regulated GxP workflows must perform site-specific qualification (IQ/OQ/PQ) and document calibration traceability to NIST-traceable standards.

Software & Data Management

The 501 operates as a standalone analog-digital hybrid instrument without embedded firmware-based data logging or network connectivity. Temperature setpoints and real-time readings are displayed locally via a fixed-segment LED interface. For laboratories requiring electronic recordkeeping, optional third-party USB or RS-232 temperature loggers (e.g., Omega OM-DAQPRO-5300 series) may be interfaced using standard PT100 probe inputs. When integrated into validated systems, the bath supports audit-trail-capable data acquisition when paired with 21 CFR Part 11-compliant software platforms—provided the external logger and host PC meet electronic signature and change-control requirements. Routine calibration verification should follow SOPs aligned with ISO/IEC 17025 Clause 6.4 and USP Analytical Instrument Qualification.

Applications

• Controlled-temperature reaction initiation and maintenance in organic synthesis (e.g., Grignard preparations, esterifications)
• Enzyme activity assays and protein denaturation studies requiring isothermal conditions between 25–80 °C
• Solvent distillation and rotary evaporation feed pre-heating (compatible with Buchi, IKA, and Heidolph systems)
• Standardization of viscometer calibration baths per ASTM D445 and ISO 3104
• Long-duration stability testing of pharmaceutical formulations per ICH Q1A(R2) guidelines
• Pre-warming of culture media and agar solutions prior to aseptic handling in microbiology labs

FAQ

Does the 501 support external circulation (e.g., to chillers or jacketed reactors)?
No—the unit is equipped solely with an internal circulation pump and lacks inlet/outlet ports for external fluid routing.
What is the maximum recommended fill level for optimal thermal uniformity?
Fill to 20–50 mm below the rim (approx. 8–10 L capacity) to ensure adequate convection headspace and prevent overflow during magnetic agitation.
Is the stainless steel bath chamber electropolished or passivated?
The chamber uses AISI 304 stainless steel with mechanically polished finish; electropolishing is not standard but can be specified as a custom option.
Can the unit be operated continuously for 72+ hours?
Yes—designed for unattended operation under nominal load; however, periodic visual inspection of fluid level and pump function is recommended per preventive maintenance protocols.
What calibration certificate options are available at time of purchase?
Factory calibration includes a basic as-found/as-left report against a NIST-traceable reference thermometer; full UKAS or DAkkS-accredited certificates require third-party service engagement post-delivery.