BOXUN CS Series Super Constant-Temperature Water Bath

Overview

The BOXUN CS Series Super Constant-Temperature Water Bath is a precision-engineered laboratory thermal control system designed for stable, uniform, and reproducible temperature maintenance in aqueous environments. Operating on resistive heating with PID-controlled feedback regulation, the CS bath delivers high-fidelity thermal stability across its full operating range—from ambient temperature up to 100 °C—without refrigeration capability. Its core architecture integrates a stainless-steel water reservoir (electropolished 304 grade), dual-mode circulation (internal recirculation for chamber homogeneity and external pumping for auxiliary thermal transfer), and thermally optimized insulation to minimize energy loss during extended operation. Unlike basic water baths, the CS Series meets stringent requirements for temperature uniformity and temporal stability, making it suitable for applications where thermal drift or gradient-induced artifacts must be avoided—such as enzyme kinetics assays, viscometry calibration, cell culture pre-warming, and reference-standard equilibration.

Key Features

• High-precision temperature control: ±0.02 °C stability (CS601) and ±0.1 °C (CS501), validated under steady-state conditions per ISO 17025-aligned internal protocols.
• Dual-circulation architecture: Internal pump ensures axial and radial temperature uniformity within the bath chamber; external port (OD 10 mm / ID 8 mm) enables closed-loop heating of external vessels or jacketed reactors at flow rates ≥8 L/min.
• Intuitive human-machine interface: CS501 features dual LED display showing setpoint and real-time bath temperature; CS601 upgrades to a capacitive touchscreen LCD with adjustable contrast, multi-point calibration offset correction, and parameter lockout functionality.
• Robust thermal design: High-density polyurethane insulation layer reduces heat loss by >40% compared to conventional foam-insulated units, supporting energy-efficient long-duration operation (>24 h).
• Compact benchtop footprint: 460×400×350 mm overall dimensions accommodate integration into space-constrained analytical workstations while maintaining a 20 L usable volume and 400×280×180 mm working chamber.
• Corrosion-resistant construction: Entire wetted surface—including tank, heater housing, and circulation manifold—is fabricated from electropolished AISI 304 stainless steel, ensuring compatibility with deionized water, buffer solutions, and mild aqueous reagents.

Sample Compatibility & Compliance

The CS Series is compatible with standard laboratory glassware (e.g., beakers, flasks, cuvettes, and immersion probes) and supports indirect thermal conditioning of sealed or jacketed sample containers via external circulation. It complies with GB/T 5170.2–2017 (Chinese national standard for temperature testing equipment) and incorporates safety features aligned with IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use), including overtemperature cut-off, dry-run protection, and earth leakage detection. While not certified for GMP or FDA 21 CFR Part 11 environments out-of-the-box, its programmable setpoint retention, calibration traceability (via offset adjustment logs), and stable thermal performance make it suitable for GLP-compliant laboratories performing method validation, equipment qualification (IQ/OQ), and routine QC thermal equilibration tasks.

Software & Data Management

The CS Series operates as a standalone analog-digital hybrid instrument without embedded network connectivity or proprietary software. All operational parameters—including setpoint, real-time temperature, pump status, and calibration offsets—are managed locally via front-panel controls. Temperature data is not logged internally; however, the analog voltage output (0–5 V or 4–20 mA, optional upon request) allows integration with external DAQ systems, SCADA platforms, or LIMS for automated temperature recording and audit trail generation. For laboratories requiring electronic records compliant with 21 CFR Part 11, third-party data acquisition modules with user authentication, electronic signatures, and immutable timestamping may be deployed in conjunction with the bath’s analog output interface.

Applications

• Calibration of temperature-sensitive instruments (e.g., digital thermometers, RTDs, thermocouples) against NIST-traceable references.
• Pre-equilibration of reagents, standards, and biological samples prior to HPLC injection, spectrophotometric analysis, or rheological measurement.
• Controlled-temperature incubation of enzymatic reactions, microbial cultures, and immunoassay plates where ±0.1 °C deviation impacts reaction kinetics or binding affinity.
• Thermal conditioning of viscometers, density meters, and refractometers requiring stable bath immersion.
• External heating loops for jacketed reactors, distillation condensers, or chromatography column ovens via the integrated external circulation port.
• Environmental simulation in materials testing labs—e.g., polymer swelling studies, hydrogel hydration kinetics, and dissolution profile development per USP .

FAQ

Is the CS Series suitable for oil bath applications?
No. The CS Series is engineered exclusively for aqueous media. Use of oils or organic solvents may degrade seals, compromise heater insulation, and invalidate temperature calibration. For non-aqueous applications, BOXUN offers dedicated oil bath models (e.g., HH Series) with higher flash-point compatibility.
Can the external circulation port be used with pressurized systems?
The external port is rated for open-loop, gravity-assisted or low-head pressure applications only (<0.1 MPa). It is not designed for connection to pressurized reactors or closed hydraulic circuits without an intermediate pressure-regulating valve.
Does the unit include a calibration certificate?
Standard delivery includes a factory verification report (non-accredited) confirming temperature stability and uniformity at 25 °C and 60 °C. Accredited calibration per ISO/IEC 17025 is available as an optional service with lead time.
What maintenance is required to sustain specified temperature accuracy?
Monthly cleaning of the stainless-steel bath interior with mild detergent and deionized water is recommended. Annual inspection of pump impeller integrity, heater element resistance, and PID controller response time is advised to maintain long-term metrological reliability.
Is firmware upgrade support available?
The CS Series uses fixed-function embedded firmware with no field-upgrade capability. Functional enhancements are implemented through hardware revisions in subsequent model generations (e.g., CS601 supersedes CS501 with improved resolution and interface).