LAUDA Hydro H 24 General-Purpose Circulating Water Bath, 25–100 °C with ±0.1 °C Stability

Overview

The LAUDA Hydro H 24 is a precision-engineered, general-purpose circulating water bath designed for stable, uniform thermal control in demanding laboratory environments. Operating within a calibrated temperature range of 25–100 °C, it leverages direct-bottom heating—positioned beneath the stainless-steel perforated support plate—to ensure rapid thermal equilibration and exceptional spatial homogeneity across the entire bath volume (20.9 L). Its ±0.1 °C temperature stability is achieved through high-resolution PID control, real-time sensor feedback, and optimized thermal mass distribution. Unlike immersion-heater designs prone to localized hot spots, the H 24’s integrated heating element and thermally insulated stainless-steel bath chamber minimize axial and radial gradients—critical for applications requiring reproducible incubation, enzymatic assays, or sample conditioning per ISO 8573-1, ASTM E2912, or USP thermal validation protocols.

Key Features

• 3.5-inch high-contrast TFT touchscreen interface with intuitive navigation and 0.1 °C resolution for setpoint entry and real-time monitoring
• Dual-layer insulated stainless-steel lid with concave internal geometry—designed to redirect condensate into the bath, eliminating droplet contamination on samples or vessels
• Integrated safety architecture: automatic cut-off with audible/visual alarm for dry-run, overtemperature (>102 °C), or under-temperature deviation (>±0.5 °C from setpoint)
• Three programmable timer modes: delay start, hold duration post-reach, and total operational time—configurable in minutes or hours for unattended overnight protocols
• Full stainless-steel wetted components: bath chamber, lid, support tray, and heater housing—resistant to corrosion from aqueous buffers, saline solutions, and mild detergents
• Drain valve located at the lowest point of the bath chamber for complete, residue-free emptying; compatible with standard lab drainage systems
• Thermally optimized housing: electrogalvanized steel chassis with powder-coated finish ensures mechanical rigidity and long-term resistance to ambient humidity and cleaning agents

Sample Compatibility & Compliance

The H 24 accommodates standard laboratory glassware—including beakers (up to 1 L), test tubes (13–25 mm diameter), cuvettes, and multi-well plates—via its 600 × 245 mm opening and 115 mm usable depth. Its non-circulating (static) operation mode meets requirements for low-turbulence applications such as cell culture pre-warming or reagent equilibration where forced convection may compromise sample integrity. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and carries CE marking for conformity with EU directives. While not intrinsically compliant with FDA 21 CFR Part 11, audit-ready data logging (via optional RS232/USB interface and LAUDA LogSoft software) supports GLP/GMP workflows when paired with validated external recording systems.

Software & Data Management

The H 24 operates autonomously via its embedded controller but supports external monitoring and documentation through LAUDA’s LogSoft software suite (sold separately). When connected via RS232 or USB, LogSoft enables continuous timestamped recording of setpoint, actual temperature, error status, and timer events—with export to CSV or PDF for inclusion in lab notebooks or regulatory submissions. The system logs all critical alarms (dry-run, overtemp) with timestamps and retains the last 100 event entries in non-volatile memory. For laboratories implementing electronic record retention policies, LogSoft-generated files can be archived alongside instrument calibration certificates (traceable to DAkkS-accredited standards) and maintenance logs to satisfy ISO/IEC 17025 clause 7.7 requirements.

Applications

• Pre-incubation of microbial growth media prior to pour plating (ASTM D5797)
• Controlled thawing of cryopreserved cell lines and serum batches per ISBER Best Practices
• Temperature equilibration of HPLC mobile phases and calibration standards
• Enzyme kinetic studies requiring precise thermal ramping and dwell stability
• Calibration of liquid-in-glass thermometers and digital probes against NIST-traceable references
• Accelerated stability testing of pharmaceutical formulations under ICH Q1A(R2) conditions

FAQ

Does the H 24 include a circulation pump?
No—the H 24 is a static (non-circulating) water bath. For forced-convection applications, consider the LAUDA Hydro RC series.
Can the bath operate continuously at 100 °C?
Yes—it is rated for continuous operation up to 100 °C, including near-boiling conditions, provided distilled or deionized water is used to prevent scaling.
Is the drain valve compatible with standard lab tubing?
Yes—the 1/4″ BSP threaded outlet accepts common silicone or PVC tubing (ID 6–8 mm) for gravity-fed drainage.
What is the maximum recommended fill level?
The bath should be filled to the “MAX” line engraved on the interior sidewall—approximately 20.9 L—to ensure optimal thermal performance and avoid overflow during lid closure.
Does the unit support external temperature probe input for chamber verification?
No—temperature sensing is internal only; external probe integration requires third-party data loggers connected to the bath’s analog output port (optional accessory).