CZGY HH-SJ Digital Display Constant Temperature Oil Bath

Overview

The CZGY HH-SJ Digital Display Constant Temperature Oil Bath is a precision-engineered laboratory thermal bath designed for stable, uniform heating of samples immersed in heat-transfer media such as silicone oil, mineral oil, or high-temperature organic liquids. Unlike water baths limited to 100 °C, this unit operates reliably up to 300 °C—enabling applications requiring elevated thermal conditions without phase transition interference. Its operation follows basic conductive and convective heat transfer principles: resistive heating elements embedded in the stainless steel bath base generate thermal energy, which is distributed through the fluid medium via natural convection (as the unit lacks forced circulation). The digital PID temperature controller continuously monitors bath temperature using a calibrated Pt100 sensor and adjusts power output to maintain setpoint stability within ±1 °C—sufficient for routine synthesis, extraction, distillation, and sample conditioning where strict GLP-grade reproducibility is not mandated but consistent thermal history is essential.

Key Features

• Stainless steel inner tank (304 grade) welded construction ensures chemical resistance, mechanical durability, and long-term dimensional stability under repeated thermal cycling.
• Cold-rolled steel outer housing with epoxy powder coating provides corrosion resistance and mechanical protection in standard laboratory environments.
• Digital LED display with 1 °C resolution enables precise setpoint entry and real-time temperature monitoring—eliminating parallax error associated with analog dials.
• Adjustable vertical lift mechanism allows controlled elevation of the bath vessel for safe insertion and retrieval of flasks, reaction vessels, or immersion probes.
• 2000 W heating capacity delivers rapid thermal ramping from ambient to 300 °C, with thermal recovery time optimized for batch processing workflows.
• No external pump or tubing required—ideal for sealed-system applications where contamination risk or fluid degradation from recirculation must be avoided.

Sample Compatibility & Compliance

The HH-SJ accommodates standard laboratory glassware including round-bottom flasks (up to 2 L), condenser assemblies, and immersion thermometers. Its 240 mm internal diameter and 140 mm depth support vessels with diameters ≤220 mm. As a Class I, non-circulating, heating-only thermal bath, it complies with IEC 61010-1:2010 for electrical safety in laboratory equipment. While not certified for hazardous location use (e.g., ATEX/IECEx), its design conforms to general-purpose lab infrastructure requirements per ISO/IEC 17025:2017 Annex A.3 for equipment suitability—provided users validate thermal uniformity across the working volume per ASTM E220–22 (Standard Test Methods for Calibration of Thermocouples by Comparison Techniques) when deploying for regulated procedures.

Software & Data Management

This model operates as a standalone hardware device with no embedded data logging, USB interface, or PC connectivity. Temperature setpoints and current readings are displayed locally only. For laboratories requiring audit trails or electronic records, external validation tools—such as calibrated handheld thermometers with timestamped logging (e.g., Fluke 1524 with Hydra Logger software) or independent data acquisition systems interfaced via thermocouple inputs—are recommended. The unit supports manual calibration verification per ISO/IEC 17025 Clause 6.5.2; users may perform periodic accuracy checks using NIST-traceable reference thermometers at three points (e.g., 100 °C, 200 °C, 300 °C) to confirm compliance with stated ±1 °C stability specification.

Applications

• Controlled-temperature distillation of high-boiling-point solvents (e.g., ethylene glycol, diphenyl ether) in organic synthesis.
• Thermal conditioning of viscosity standards prior to rheometer calibration (ASTM D445).
• Accelerated aging studies of polymer films or coatings per ISO 188:2011.
• Pre-heating of reagents and solvents for Grignard reactions or metal-catalyzed couplings requiring anhydrous, oxygen-free environments.
• Drying and solvent removal from heat-stable biological extracts where vacuum ovens are unavailable or unsuitable.
• Calibration of liquid-in-glass thermometers and bimetallic sensors using fixed-point oil baths.

FAQ

What is the maximum recommended operating temperature for continuous use?
The HH-SJ is rated for continuous operation up to 300 °C. However, sustained use above 250 °C may accelerate thermal aging of seals and reduce long-term sensor accuracy; periodic verification is advised.
Can this bath be used with water instead of oil?
Yes, but only below 100 °C and with caution—water evaporation, boiling noise, and potential overflow make it suboptimal compared to dedicated water baths. Use only deionized water to minimize scaling.
Is the temperature sensor user-replaceable?
The integrated Pt100 sensor is factory-calibrated and not field-serviceable. If drift exceeds ±1.5 °C, contact CZGY technical support for recalibration or replacement.
Does the unit include over-temperature protection?
Yes—a redundant mechanical cut-off switch activates at ~320 °C to interrupt power, preventing catastrophic failure in case of PID controller malfunction.
What maintenance is required for optimal performance?
Monthly cleaning of the stainless steel bath interior with mild detergent and thorough drying; annual inspection of power cord integrity and terminal tightness; avoidance of chlorinated or halogenated solvents that may corrode 304 stainless steel.