Julabo PURA 14 Universal Water Bath

Overview

The Julabo PURA 14 Universal Water Bath is a precision-engineered, CE-compliant temperature control system designed for reliable, long-term operation in demanding laboratory environments. Built upon Julabo’s decades of thermal management expertise, the PURA series replaces the legacy TW line with enhanced thermal architecture, improved user interface ergonomics, and expanded safety functionality—while retaining full backward compatibility with standard accessories. This unit operates on the principle of convective heat transfer via thermostatically regulated water circulation within a stainless-steel bath chamber. Its core function is to maintain highly stable, uniform temperature fields across variable sample loads—critical for applications requiring strict thermal reproducibility, such as enzymatic assays, polymerization kinetics, cell culture pre-warming, and reference material conditioning. The device is not intended for sterilization or autoclaving; rather, it serves as a primary platform for non-sterile, open-bath temperature stabilization under ambient lab conditions.

Key Features

• High-stability temperature control: ±0.15 °C stability over time (measured at center point, load-dependent) with 0.1 °C resolution on LED display
• Stainless-steel bath chamber (33 × 27 × 14 cm internal dimensions) supporting 2–14 L working volume—optimized for both small-volume vials and larger beakers
• 1.8 kW heating capacity with adaptive power modulation, enabling rapid ramp-up from +5 °C to +99.9 °C without overshoot
• Integrated dry-run protection: automatic heater shutdown upon detection of insufficient fluid level
• Condensate management design: chamfered bath rim directs condensation back into reservoir during high-humidity operation
• IP21-rated front panel with sealed membrane keys and splash-resistant housing for routine lab use
• Removable full-immersion platform (standard) for elevated sample positioning and improved thermal uniformity
• Acoustic and visual alarm system for temperature deviation, sensor fault, or low-level warning
• Drain valve included (PURA 14 and larger models only), facilitating maintenance and solution exchange

Sample Compatibility & Compliance

The PURA 14 accommodates a broad range of sample containers—including glass and plastic test tubes (up to 3 simultaneously with optional rack), Erlenmeyer flasks, centrifuge tubes, cuvettes, and Petri dishes—without requiring custom fixtures. Its open-bath configuration supports direct immersion of samples up to 14 cm depth. All wetted parts are electropolished AISI 316 stainless steel, ensuring chemical resistance to common aqueous buffers, saline solutions, ethanol/water mixtures, and mild detergents. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets EN 60529 (IP21) for ingress protection. It is validated for use in GLP-regulated workflows where temperature traceability and operator-defined setpoint logging are required—though native audit trail functionality requires integration with external data acquisition systems compliant with FDA 21 CFR Part 11.

Software & Data Management

The PURA 14 operates as a standalone instrument with no embedded microprocessor-based software stack. Temperature setpoints, real-time bath temperature, and status indicators are managed exclusively via its local LED interface. For laboratories requiring electronic recordkeeping, Julabo offers optional analog output (0–10 V or 4–20 mA) and digital RS232/RS485 interfaces (via accessory module). These allow seamless integration with LabVIEW, MATLAB, or LIMS platforms for automated temperature logging, trend analysis, and CSV export. While the device itself does not store historical data or generate electronic signatures, its analog/digital outputs support externally validated data integrity protocols when paired with compliant acquisition hardware and SOP-defined calibration intervals.

Applications

• Routine incubation of reagents, standards, and biological samples prior to analysis (e.g., ELISA substrate warming, PCR master mix equilibration)
• Controlled dissolution testing per USP and ASTM D5236 for pharmaceutical formulations
• Thermal conditioning of polymers and composites during tensile or impact testing (ISO 527, ASTM D638)
• Accelerated corrosion screening of metallic alloys in chloride-containing electrolytes (ASTM G31)
• Pre-heating of dental impression materials and restorative cements per ISO 4823
• Food microbiology: tempering of agar media, diluent pre-warming, and enzyme activity assays (AOAC 977.27)
• Environmental testing: extraction efficiency optimization for EPA Method 3510C (liquid-liquid extraction)

FAQ

What is the minimum recommended fill volume for stable operation?
The bath must be filled to at least 2 L (approximately 14 cm depth) to ensure proper sensor immersion and thermal mass for ±0.15 °C stability.
Can the PURA 14 be used with cooling circulators for sub-ambient operation?
No—the PURA series is a heating-only system. Sub-ambient control requires a separate chiller or a Julabo F25 or PRESTO model with dual heating/cooling capability.
Is the bath compatible with aggressive solvents like acetone or chloroform?
No. Only water, aqueous salt solutions, glycerol/water mixtures (<30%), and ethanol/water blends (<70%) are approved. Organic solvents may degrade seals and compromise IP21 integrity.
Does Julabo provide factory calibration certificates with NIST-traceable documentation?
Yes—calibration verification reports (including as-found/as-left data at three points: 25 °C, 37 °C, and 60 °C) are available upon request at time of order or as a post-purchase service.
What maintenance is required beyond routine cleaning?
None. The sealed heating element and solid-state electronics are rated for lifetime operation under normal lab conditions. Annual inspection of drain valve O-rings and visual check of bath surface integrity are recommended but not mandatory.