ZSBB-726 Dual-Row Six-Position Precision Water Bath Circulator

Overview

The ZSBB-726 Dual-Row Six-Position Precision Water Bath Circulator is an engineered thermal management system designed for consistent, uniform temperature control in life science and bioengineering laboratories. Operating on the principle of forced convection via integrated circulation pump and high-response thermal sensing, it maintains stable liquid-phase environments across dual parallel wells—each accommodating standard-sized glassware or reaction vessels. Unlike passive water baths, the ZSBB-726 actively circulates heated water throughout its 24-liter stainless-steel chamber, minimizing thermal gradients and ensuring reproducible incubation conditions essential for enzyme kinetics, cell culture pre-warming, reagent equilibration, and molecular biology workflows. Its ambient-to-100 °C operating range and ±0.1 °C temperature stability meet the stringent requirements of ISO/IEC 17025-accredited testing labs and GLP-compliant research protocols.

Key Features

• Microprocessor-controlled PID temperature regulation with real-time feedback from high-accuracy platinum resistance thermometers (PT100-grade)
• Dual-row, six-hole configuration optimized for simultaneous processing of multiple samples—compatible with standard 16–25 mm test tubes, centrifuge tubes, and small flasks
• Backlit LCD interface displaying both setpoint and actual bath temperature with 0.1 °C resolution
• Integrated safety architecture including low-water-level detection, overtemperature cutoff, and anti-dry-burn protection with automatic shutdown
• Power-fail recovery function: resumes prior operational parameters—including timer countdown and target temperature—upon grid restoration
• User-configurable 100-hour programmable timer with audible/visual alert at completion
• Parameter lockout mode prevents unauthorized modification of critical settings during unattended operation
• Stainless-steel interior (304 grade) and corrosion-resistant exterior housing ensure long-term durability in humid laboratory environments

Sample Compatibility & Compliance

The ZSBB-726 accommodates a broad range of sample containers without requiring adapters: standard 15 mL and 50 mL conical tubes, 13 × 100 mm culture tubes, microcentrifuge tubes (when placed in rack inserts), and small-volume glass vials. Its open-bath design allows direct immersion of probes, sensors, or reaction vessels into the circulating medium. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU). While not certified for sterile applications, its smooth, crevice-free chamber facilitates routine cleaning and validation per institutional SOPs. Documentation supports traceability for internal quality audits under ISO 9001 and ISO 13485 frameworks.

Software & Data Management

The ZSBB-726 operates as a standalone instrument with no proprietary software dependency. All operational data—including start time, duration, setpoint history, and alarm logs—are retained in non-volatile memory and accessible via front-panel navigation. For integration into networked lab environments, optional RS-232 or USB-to-serial interfaces (available as accessory kits) enable connection to LIMS or ELN systems. When interfaced, the device transmits timestamped temperature readings at user-defined intervals (1–60 s), supporting 21 CFR Part 11-compliant electronic records when paired with validated third-party acquisition software. Audit trail functionality includes operator ID tagging (via external authentication layer) and immutable event logging for calibration, maintenance, and deviation reporting.

Applications

• Precise pre-warming of culture media, sera, and enzymatic reagents prior to cell passaging or assay setup
• Controlled denaturation and renaturation studies in protein biochemistry
• Thermal equilibration of PCR master mixes and restriction digestion buffers
• Accelerated stability testing of biopharmaceutical intermediates under defined thermal stress profiles
• Supporting ASTM D5296 (gel permeation chromatography) sample preparation protocols requiring constant bath temperature
• Calibration reference baths for thermistor-based sensors and digital thermometers used in QC/QA workflows

FAQ

Is the ZSBB-726 suitable for oil bath applications?

No—it is configured exclusively for aqueous media. Its heating elements, pump seals, and temperature sensor calibration are optimized for water; use of oils may compromise thermal accuracy and void warranty.
Can the unit maintain temperature uniformity across all six positions simultaneously?

Yes. Internal circulation ensures ±0.2 °C spatial uniformity (measured at 5 cm depth across all wells) when operated within specified load limits (≤80% volume fill, balanced vessel distribution).
Does the device support remote monitoring via Ethernet or Wi-Fi?

Not natively. Remote access requires external hardware gateways or serial-to-Ethernet converters compatible with Modbus RTU protocol.
What is the recommended maintenance interval for pump and sensor verification?

Biannual verification using NIST-traceable reference thermometers is advised; full service—including impeller inspection and seal replacement—is recommended every 24 months under continuous operation.
Is the stainless-steel chamber electropolished for enhanced cleanability?

The interior surface finish meets Ra ≤ 0.8 µm per ASTM B912, enabling effective removal of organic residues during routine decontamination with 70% ethanol or alkaline detergent solutions.