Beifen Sanpu HH-S Digital Display Constant-Temperature Oil Bath
| Brand | Beifen Sanpu |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | HH-S |
| Power Supply | 220 V ±10 V, 50 Hz |
| Temperature Control Range | Ambient to 300 °C |
| Chamber Dimensions (W × D × H) | 280 × 280 × 300 mm |
| Heating Power | 2500 W |
| Safety Features | Grounding Terminal Required, Immersion-Only Operation for Heating Element |
Overview
The Beifen Sanpu HH-S Digital Display Constant-Temperature Oil Bath is a precision-engineered thermal platform designed for stable, uniform heating of samples immersed in heat-transfer oils. Unlike water baths, oil baths operate at elevated temperatures—up to 300 °C—making them indispensable for applications requiring thermal stability beyond the boiling point of water. The device employs a resistive immersion heater coupled with a microprocessor-based PID temperature controller and high-resolution digital display (0.1 °C resolution), enabling accurate setpoint programming and tight thermal regulation (±0.5 °C typical stability at steady state). Its robust stainless steel tank construction ensures chemical resistance and long-term dimensional stability under repeated thermal cycling. The HH-S is not intended for ambient-air heating or dry operation; it functions exclusively as a liquid-immersed thermal medium system—consistent with ASTM E207–22 guidelines for calibration of immersion-type temperature control equipment.
Key Features
- Microprocessor-controlled PID temperature regulation with digital LED display (0.1 °C readout resolution) for precise setpoint entry and real-time monitoring
- Stainless steel inner bath chamber (280 × 280 × 300 mm) engineered for mechanical durability, corrosion resistance, and uniform heat distribution
- 2500 W high-power heating element fully submerged during operation—designed to prevent dry-firing and ensure thermal safety compliance
- Dedicated grounding terminal compliant with IEC 61010-1:2010 safety standards for laboratory electrical equipment
- Thermal cut-off protection activated upon abnormal temperature rise or sensor failure, meeting Class II insulation requirements
- No external circulation pump or chiller interface—optimized for static oil bath applications including reflux, extraction, and controlled-temperature reaction setups
Sample Compatibility & Compliance
The HH-S supports standard laboratory glassware—including round-bottom flasks (up to 2 L), beakers, test tubes, and sample vials—when immersed in compatible thermal oils such as silicone oil (e.g., Dow Corning 200 Fluid, flash point >300 °C) or mineral oil (flash point ≥250 °C). It is not suitable for volatile organic solvents or low-flash-point media. The unit complies with GB/T 28961–2012 (Chinese national standard for laboratory heating equipment) and aligns with general-purpose requirements outlined in ISO/IEC 17025:2017 for equipment used in testing laboratories. While not certified to UL or CE for export markets, its design incorporates fundamental safeguards required for GLP-compliant environments—particularly grounding integrity, thermal runaway prevention, and operator-accessible emergency power disconnection.
Software & Data Management
The HH-S operates as a standalone analog-digital hybrid instrument with no embedded firmware logging, network connectivity, or PC interface. Temperature setpoints and real-time readings are displayed locally via a front-panel LED screen; no data export, audit trail, or electronic record functionality is provided. For laboratories operating under FDA 21 CFR Part 11 or EU Annex 11 requirements, external validation and manual logbook documentation of setpoint entries, operational duration, and observed bath temperatures are necessary. Calibration verification should be performed at minimum annually using NIST-traceable RTD probes per ISO/IEC 17025 clause 6.5.2.
Applications
- Controlled-temperature distillation and solvent recovery in organic synthesis workflows
- Accelerated aging studies of polymers and adhesives under elevated thermal stress
- Pre-heating and holding of reagents prior to GC or HPLC injection
- Drying and concentration of heat-sensitive biological extracts where vacuum ovens are impractical
- Calibration of thermometers, thermocouples, and RTDs across extended temperature ranges (25–300 °C)
- Supporting ASTM D92 (Cleveland Open Cup Flash Point), ASTM D235 (solvent purity), and USP <1210> thermal validation protocols
FAQ
What types of heat-transfer fluids are compatible with the HH-S oil bath?
Silicone oils with flash points above 300 °C and kinematic viscosities between 10–100 cSt at 25 °C are recommended. Mineral oils may be used up to 250 °C if flash point and oxidation stability are verified.
Is the HH-S suitable for use with flammable solvents?
No. Flammable liquids—including acetone, ethanol, ether, and hexane—must never be used as bath media due to fire hazard and uncontrolled vapor pressure generation.
Does the HH-S include a temperature calibration certificate?
No. As supplied, the unit ships without factory calibration documentation. Users must perform initial and periodic verification using an independent, NIST-traceable reference thermometer.
Can the heating element be replaced in the field?
Yes. The immersion-type heating assembly is modular and serviceable by qualified personnel following disassembly procedures in the technical manual—provided the unit is fully cooled and drained prior to maintenance.
What is the maximum recommended fill level for safe operation?
Oil must fully cover the heating element and maintain a minimum 50 mm depth above it during operation. Do not exceed 80% of internal chamber volume to prevent overflow during thermal expansion.
