CZGY HH-WO-30L Circulating Oil/Water Bath

Overview

The CZGY HH-WO-30L Circulating Oil/Water Bath is an engineered thermal control system designed for precise, stable, and uniform temperature maintenance in laboratory-scale chemical synthesis, material testing, calibration procedures, and sample conditioning applications. Operating on resistive heating with solid-state relay (SSR) power modulation, the unit delivers consistent thermal output across its full operating range—from ambient +10 °C up to 300 °C—making it suitable for both water-based low-temperature protocols and high-boiling-point oil bath operations. Its dual-circulation architecture (internal recirculation within the bath chamber and external circulation via integrated pump and inlet/outlet ports) ensures rapid thermal equilibration and minimizes axial and radial temperature gradients, supporting reproducible experimental conditions required in method development and quality control workflows.

Key Features

• Stainless steel inner tank (30 L capacity) with corrosion-resistant finish and seamless weld construction for long-term durability under repeated thermal cycling and exposure to organic solvents or high-viscosity heat-transfer media.
• Powder-coated cold-rolled steel exterior housing provides mechanical robustness, thermal insulation, and resistance to abrasion and incidental chemical splashes.
• Dual-mode circulation system: internal impeller-driven flow maintains homogeneity inside the bath; external port interface (G1/4″ BSP) enables connection to jacketed reactors, condensers, or secondary temperature-controlled apparatuses.
• High-power 4500 W heating element with SSR-based zero-crossing control ensures smooth power delivery, reduced electrical noise, and extended component lifespan compared to mechanical contactor-based systems.
• Digital PID temperature controller with intuitive LED display offers real-time setpoint adjustment, current temperature readout, and over-temperature safety cutoff (hardware-limited at 310 °C).
• Compact footprint (400 × 260 × 300 mm effective working volume) optimized for benchtop integration without compromising thermal mass or stability.

Sample Compatibility & Compliance

The HH-WO-30L accommodates a broad range of sample vessels—including round-bottom flasks (up to 5 L), reaction kettles, glassware arrays, and immersion probes—within its open-bath configuration. Its temperature stability of ±1 °C (measured at load, steady-state, per ASTM E2789-22 guidelines for liquid bath uniformity verification) meets standard requirements for routine QC testing, dissolution studies (USP auxiliary equipment), and pre-conditioning steps prior to rheological or spectroscopic analysis. While not certified to ISO/IEC 17025 or GLP audit standards out-of-the-box, the unit’s design supports traceable calibration using NIST-traceable RTD or thermistor probes and is routinely deployed in laboratories maintaining internal SOPs aligned with ISO 17025 clause 6.4 (equipment management) and FDA 21 CFR Part 11–compliant environments when paired with validated data logging systems.

Software & Data Management

The HH-WO-30L operates as a standalone analog/digital hybrid instrument with no embedded firmware or network connectivity. Temperature setpoints and real-time readings are managed exclusively via front-panel controls and display. For laboratories requiring electronic recordkeeping, the unit features a 0–5 V or 4–20 mA analog output signal (configurable per OEM specification upon request), enabling integration with third-party data acquisition systems (e.g., LabVIEW, DeltaV, or custom SCADA platforms). Optional external USB or RS-485 interfaces can be added through certified retrofit modules—subject to factory validation—to support audit-trail generation, alarm logging, and remote monitoring in regulated settings.

Applications

• Controlled-temperature reactions involving heat-sensitive catalysts or exothermic processes requiring external cooling loop integration.
• Calibration of thermocouples, RTDs, and infrared sensors across extended ranges (e.g., from 30 °C to 280 °C).
• Viscosity measurement preparation for rotational rheometers where sample pre-equilibration at target shear temperature is critical.
• Accelerated stability testing of pharmaceutical excipients and polymer melts under ISO 14644-1 Class 7 cleanbench-compatible conditions.
• Pre-heating and holding of metallographic specimens prior to etching or microhardness indentation.
• Supporting role in ASTM D92 (Cleveland Open Cup), D93 (Pensky-Martens), and D1500 (ASTM Color) test methods where precise bath temperature control is mandated.

FAQ

Is the HH-WO-30L compatible with silicone oil, glycerol, and mineral oil baths?

Yes—the stainless steel tank and sealed circulation pump are chemically resistant to common high-temperature heat-transfer fluids, including polydimethylsiloxane (PDMS)-based oils and USP-grade glycerin solutions.
Does the unit include a built-in timer or programmable ramp-soak profile capability?

No—this is a manually operated constant-temperature bath without time-based automation. Programmable profiles require external controller integration.
Can the external circulation port be used for both inflow and outflow simultaneously?

The system supports unidirectional external flow only; bidirectional recirculation requires an external manifold or dual-pump configuration.
What is the maximum allowable fill level for optimal thermal performance?

For stable operation across the full 300 °C range, maintain fluid level between 60% and 90% of tank volume (18–27 L) to ensure adequate pump submersion and avoid dry-heating risk.
Is CE or UL certification available for export to North America or the EU?

The base model complies with IEC 61010-1:2010 for laboratory electrical safety; CE marking is available upon request with additional EMC and RoHS documentation; UL listing requires formal application and third-party testing.