LAUDA Hydro H 8 A Circulating Water Bath with Magnetic Stirring, 25–100 °C, ±0.1 °C Stability

Overview

The LAUDA Hydro H 8 A is a precision-engineered circulating water bath with integrated magnetic stirring, designed for laboratories requiring high thermal stability, uniform temperature distribution, and operational reliability across routine and regulated applications. Operating within a calibrated range of 25–100 °C, the unit employs direct-bottom heating beneath a stainless-steel perforated support plate—ensuring rapid thermal equilibration and minimizing axial and radial temperature gradients. Its core thermal architecture follows the principle of forced convection via magnetic agitation: a brushless DC motor housed in the bath base rotates magnetic stir bars placed inside sample vessels, inducing gentle yet effective fluid circulation throughout the entire bath volume. This dual-mode control—passive insulation combined with active mixing—achieves a spatial temperature uniformity of ≤±0.2 °C across the working zone (per ISO 17025-compliant validation protocols), significantly exceeding passive static bath performance. The system is not intended for sterilization or autoclave-grade operation but is validated for sustained use up to boiling point under continuous load conditions.

Key Features

• Integrated magnetic stirring drive with brushless motor—enables consistent thermal homogenization without external stirrers or mechanical coupling
• High-contrast 3.5-inch TFT display with intuitive menu navigation; temperature setpoint resolution of 0.1 °C
• Dual-layer insulated stainless-steel bath cover with contoured inner surface—redirects condensate into the bath and reduces heat loss by >35% vs. standard lids
• Comprehensive safety system: independent dry-run detection, overtemperature cutoff (hardware-limited at 105 °C), and audible/visual alarm on fault activation
• Three programmable timer modes: delay start, hold time post-temperature attainment, and total runtime—configurable in minutes or hours
• Full stainless-steel wetted components (bath chamber, cover, perforated tray, heater housing) for corrosion resistance and cleanability per GLP lab standards
• Drain valve with quick-connect fitting for controlled medium replacement; compatible with deionized water, glycol-water mixtures (up to 30%), and low-viscosity silicone oils

Sample Compatibility & Compliance

The Hydro H 8 A accommodates standard laboratory glassware including beakers (up to 1 L), test tubes (13–25 mm OD), cuvettes, and enzymatic assay plates when used with optional rack inserts. Its 245 × 200 mm opening and 115 mm usable depth support multi-vessel configurations while maintaining thermal integrity. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and carries CE marking under the EU Machinery Directive. While not certified for medical device manufacturing (ISO 13485), its traceable temperature stability (±0.1 °C), audit-ready event logging, and hardware-enforced safety interlocks make it suitable for QC environments operating under ISO/IEC 17025, USP , and FDA 21 CFR Part 11–aligned workflows when paired with validated calibration procedures.

Software & Data Management

The H 8 A operates as a standalone instrument with embedded firmware—no PC dependency required for basic operation. All critical events (temperature deviations >±0.3 °C, power interruptions, safety triggers) are timestamped and stored in non-volatile memory for up to 1,000 entries. Optional RS232 or USB-to-serial interface (LAUDA COM-Link adapter, sold separately) enables connection to LabVIEW, MATLAB, or custom SCADA systems for remote monitoring and automated data capture. Calibration certificates—including as-found/as-left records per ISO/IEC 17025—can be generated using LAUDA’s CaliSoft v4.2 software suite, which supports NIST-traceable probe verification and uncertainty budgeting. Audit trail functionality meets ALCOA+ principles for regulated biopharma and clinical testing labs.

Applications

• Enzyme kinetics assays requiring stable 37 °C incubation with minimized thermal drift
• Viscosity standardization of reference oils (ASTM D445) using constant-temperature baths
• Cell culture pre-warming of media and reagents prior to aseptic handling
• Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R3)
• Calibration of liquid-in-glass thermometers and RTDs against primary standards
• Controlled dissolution testing support (USP Apparatus I/II water jacket temperature maintenance)

FAQ

Does the H 8 A support external temperature probes for independent verification?
Yes—via the optional PT100 input port (accessory probe sold separately), enabling real-time comparison between internal sensor and user-supplied reference.
Can the bath operate continuously at 100 °C for extended periods?
Yes—its sealed heater assembly and thermal cut-off redundancy allow uninterrupted operation at boiling point; however, evaporation rate increases significantly above 90 °C and requires periodic top-up with deionized water.
Is the magnetic stirring speed adjustable?
No—the motor runs at a fixed optimal RPM (300 ± 20 rpm) engineered for laminar flow and minimal vibration transmission to sensitive samples.
What is the recommended recalibration interval?
LAUDA recommends annual calibration using a NIST-traceable Class A thermometer; more frequent verification is advised in GxP environments per internal SOPs.
Can the unit be mounted in a fume hood?
Yes—provided ambient temperature remains between 15–30 °C and airflow does not exceed 0.5 m/s directly over the bath opening to avoid convective cooling effects.