Autosense WB Series Constant-Temperature Water Bath

Overview

The Autosense WB Series Constant-Temperature Water Bath is a precision-engineered laboratory thermal platform designed for stable, uniform, and controllable aqueous heating across a broad operational range (ambient to 90 °C). Utilizing PTC (Positive Temperature Coefficient) ceramic heating elements and a microprocessor-based PID temperature controller, the system delivers rapid thermal response, minimal temperature overshoot, and high reproducibility—critical for applications requiring strict thermal consistency over extended durations. Its integrated water circulation pump ensures homogeneous temperature distribution throughout the 20 L bath chamber, eliminating axial or radial thermal gradients that compromise assay integrity. The unit operates without external cooling infrastructure and is optimized for continuous-duty use in QC labs, academic research facilities, and pharmaceutical development environments where regulatory traceability and process repeatability are essential.

Key Features

• Microprocessor-controlled PID algorithm with dual 4-digit LED display for simultaneous monitoring of setpoint and real-time bath temperature (0.1 °C resolution)
• PTC ceramic heating element with intrinsic dry-run protection—eliminates risk of thermal damage during accidental low-fluid operation
• Programmable mechanical oscillation (40–100 Hz/min, 18 mm horizontal amplitude) for enhanced sample mixing and heat transfer uniformity
• Adjustable digital timer (10–90 min) with auto-shutdown functionality to prevent unattended overexposure
• Over-temperature safety cutoff (user-configurable between 25–130 °C), independently monitored and electrically isolated from main control circuitry
• Ergonomic design including recessed handle mounting and conical lid geometry to minimize condensation ingress into sample vessels
• Modular accessory compatibility: supports interchangeable racks for test tubes, centrifuge tubes, cuvettes, and custom glassware (ISO/IEC 17025-compliant mounting interfaces)

Sample Compatibility & Compliance

The WB Series accommodates standard laboratory vessels up to 50 mL capacity per position when using universal tube racks; larger formats (e.g., 100–250 mL Erlenmeyer flasks) may be supported with optional support trays. All wetted surfaces are constructed from corrosion-resistant stainless steel (AISI 304), compliant with USP and ISO 10993-5 for non-cytotoxic contact with aqueous biological media. The device meets IEC 61010-1:2010 safety requirements for electrical equipment used in laboratory environments and includes CE marking for EMC and Low Voltage Directive conformity. While not inherently GLP/GMP-certified, its digital logging capability (via optional RS-232/USB interface) enables audit-ready data capture aligned with FDA 21 CFR Part 11 principles when integrated into validated workflows.

Software & Data Management

The WB Series operates as a standalone analog-digital hybrid instrument. Optional communication modules provide ASCII protocol output via RS-232 or USB virtual COM port, enabling integration with LabVIEW, MATLAB, or LIMS platforms for time-stamped temperature logging, remote parameter adjustment, and alarm event reporting. All temperature setpoints, timer values, and over-temperature thresholds are stored in non-volatile memory and retain configuration after power cycling. Firmware updates are performed via secure bootloader mode using manufacturer-provided utilities—no proprietary software installation required on host systems. Audit trails (if enabled via external DAQ system) record operator ID, timestamp, parameter changes, and fault codes—supporting ISO/IEC 17025 clause 7.7 and GxP data integrity expectations.

Applications

• Enzyme kinetics assays requiring precise thermal stabilization (e.g., amylase, protease, polymerase activity at 37 °C or 65 °C)
• Cell culture sample warming prior to flow cytometry or microscopy analysis
• Standardization of viscosity measurements per ASTM D445 and ISO 3104 using calibrated capillary viscometers
• Thermal equilibration of reagents in HPLC mobile phase preparation and dissolution testing (USP <711>)
• Controlled denaturation studies in protein biochemistry and nucleic acid hybridization protocols
• Pre-incubation of microbiological media (e.g., agar plates, broth cultures) under CLSI M22-A3 guidelines

FAQ

Does the WB Series support external temperature probe input for independent verification?
Yes—optional PT100 sensor input is available via auxiliary port for third-party calibration cross-checking against internal thermistor readings.
Can the oscillation function operate independently of heating?
Yes—the agitation mechanism and thermal control circuits are fully decoupled, allowing room-temperature shaking for suspension homogenization without energy consumption from heaters.
Is the 20 L bath volume usable at maximum temperature (90 °C) without evaporation concerns?
Under continuous operation at 90 °C, typical evaporation loss is ≤15 mL/hour with lid closed; recommended replenishment interval is every 8 hours for unattended 24-hr runs.
What maintenance intervals are specified for the circulation pump and heating element?
No scheduled replacement is required; the PTC heater has no consumable components, and the sealed magnetic-drive circulation pump is rated for >20,000 operating hours under nominal load conditions.
Are rack dimensions standardized to accommodate ANSI/SLAS footprint specifications?
Rack mounting holes conform to SLAS-1-2004 (127.8 mm × 85.5 mm grid), ensuring compatibility with automated liquid handlers and stackable storage systems.