Yiheng MP-5H Precision Circulating Water/Oil Bath

Overview

The Yiheng MP-5H Precision Circulating Water/Oil Bath is an engineered thermal management system designed for stable, reproducible temperature control in laboratory and quality assurance environments. Based on resistive heating and forced convection principles, the unit maintains precise setpoint stability across a wide operational range—from ambient +5 °C up to 100 °C—making it suitable for applications requiring consistent thermal conditioning of samples, reactors, or external equipment. Its dual-mode circulation architecture supports both internal bath homogenization and external heat transfer via a dedicated pressure-driven pump, enabling integration with jacketed reactors, viscometers, spectrophotometer cells, or other externally cooled/heated instrumentation. The system employs a microprocessor-based PID controller with real-time feedback from a high-stability Pt100 sensor, delivering typical temperature stability of ±0.1 °C under static load conditions and ±0.3 °C during active external circulation.

Key Features

• Microprocessor-controlled PID temperature regulation with large-character LCD interface for intuitive monitoring and adjustment
• Dual-circulation capability: internal recirculation ensures uniform bath temperature distribution; external circulation delivers controlled thermal energy to auxiliary devices via standardized quick-connect ports
• Integrated safety architecture including over-temperature and low-temperature audio-visual alarms, plus liquid-level detection to prevent dry-run operation of the heater and pump
• High-efficiency 1050 W heating element with rapid thermal response and low thermal inertia design
• Stainless steel inner tank (6.7 L capacity) optimized for corrosion resistance and long-term compatibility with water, silicone oil, and ethylene glycol–water mixtures
• Adjustable external pump speed to match flow resistance and thermal load requirements of connected systems

Sample Compatibility & Compliance

The MP-5H accommodates standard laboratory glassware (e.g., beakers, flasks, cuvettes) and interfaces seamlessly with externally jacketed equipment requiring regulated fluid temperatures. Its construction complies with IEC 61010-1:2010 safety standards for electrical equipment used in measurement, control, and laboratory use. While not certified for medical device manufacturing, its thermal performance and alarm logging functionality support GLP-compliant workflows when integrated into documented SOPs. The unit meets basic EMC requirements per EN 61326-1 and operates within Class II insulation protection rating. For applications demanding traceable calibration, users may implement third-party verification against NIST-traceable reference thermometers (e.g., Fluke 1523 or similar), with calibration intervals aligned to internal QA protocols.

Software & Data Management

The MP-5H operates via embedded firmware without dependency on PC software. However, its optional multi-stage programmable controller extends functionality significantly: users may define up to seven independent programs, each comprising nine sequential steps. Each step specifies target temperature, dwell time (1 minute to 99 hours 59 minutes), ramp rate (if enabled), and pump speed setting. Scheduled start/stop times allow unattended overnight or weekend operation. All program parameters are retained in non-volatile memory during power loss. Though the device does not generate electronic audit trails or support FDA 21 CFR Part 11-compliant user authentication, its deterministic behavior and parameter retention enable robust process repeatability in research, teaching, and routine QC labs where formal electronic records are not mandated.

Applications

• Thermal equilibration of analytical samples prior to HPLC, GC, or UV-Vis analysis
• Temperature control of enzymatic reaction vessels and cell culture accessories
• Calibration of temperature-sensitive transducers and sensors
• Stabilization of optical components in spectroscopy setups subject to thermal drift
• Supporting viscosity measurements using rotational or capillary viscometers requiring constant bath temperature
• Preconditioning of polymer melts and thermoplastic resins prior to rheological testing
• Use as a secondary thermal source in multi-zone environmental simulation rigs

FAQ

What fluids are compatible with the MP-5H bath?

Deionized water, 30–50% ethylene glycol–water mixtures, and silicone oils rated to at least 100 °C are recommended. Avoid halogenated solvents or strong acids/bases due to material compatibility limitations.
Can the MP-5H cool below ambient temperature?

No—the MP-5H is a heating-only system. It cannot achieve sub-ambient temperatures; refrigerated circulators are required for cooling applications.
Is external circulation flow rate adjustable?

Yes—the integrated pressure pump features variable-speed control, allowing users to optimize flow rate based on external system backpressure and thermal transfer requirements.
Does the unit include calibration documentation?

Factory calibration data is not supplied by default. Users should perform initial verification using a traceable reference thermometer and document results per internal quality procedures.
What maintenance is required for long-term reliability?

Routine inspection of fluid level, periodic cleaning of the stainless steel tank, and annual verification of temperature accuracy and alarm functionality are recommended. Replace circulating fluid every 6–12 months depending on usage intensity and fluid type.