Shanghai Yiheng MP/MPG/MPE/MPGE Series Precision Refrigerated & Heated Circulating Baths
| Brand | Shanghai Yiheng |
|---|---|
| Origin | Shanghai, China |
| Model Series | MP, MPG, MPE, MPGE |
| Temperature Range | −50 °C to 100 °C (model-dependent) |
| Temperature Stability | ±0.02 °C (MPE/MPGE high-precision models) |
| Control Accuracy | ±0.1 °C (MP/MPG standard models) |
| Bath Opening × Depth | 150 mm × 160 mm × 150 mm (standard) / 240 mm × 170 mm × 200 mm (large-volume MPG/MPGE) |
| Reservoir Volume | 4.5 L to 13 L |
| Circulation Flow Rate | 8 L/min (adjustable) |
| Heating Power | 2300 W to 3100 W |
| Refrigeration | Eco-friendly R-404A or R-507 refrigerant |
| Power Supply | AC 220 V, 50 Hz |
| External Circulation | Yes (pressure-suction pump with dual-port interface) |
| Internal/External Dual-Circulation Mode | Yes |
| Safety Features | Over-temperature, low-temperature, and low-level liquid alarms with audible/visual alerts |
| Optional | RS-485, USB data export (U-disk), printer interface, multi-segment programmable controller (7 programs × 63 steps, time per step: 1–99 h 59 min) |
Overview
The Shanghai Yiheng MP, MPG, MPE, and MPGE Series Refrigerated & Heated Circulating Baths are engineered for precision thermal control in laboratory and industrial R&D environments. These units operate on a dual-mode thermoregulation principle—combining resistive heating with vapor-compression refrigeration—to deliver stable, uniform temperature fields across a broad operational range from −50 °C to +100 °C. Designed for applications requiring external heat exchange (e.g., jacketed reactors, viscometers, spectroscopic cells), the baths integrate a high-head pressure-suction circulation pump capable of sustaining consistent flow rates up to 8 L/min against backpressure. All models feature a stainless-steel reservoir, sealed insulation, and a microprocessor-based PID temperature controller optimized for minimal overshoot and rapid thermal equilibration. The MPE and MPGE sub-series incorporate enhanced sensor architecture (PT1000-grade platinum RTDs) and advanced digital compensation algorithms, achieving temperature stability of ±0.02 °C—meeting calibration traceability requirements for ISO/IEC 17025-accredited labs.
Key Features
- Intelligent microcomputer LCD controller with real-time temperature display, adjustable ramp rate, and user-defined setpoint hold functionality
- Dual-circulation architecture supporting both internal bath homogenization and external thermal load conditioning via dedicated inlet/outlet ports
- Eco-compliant refrigeration system using R-404A or R-507 refrigerants, certified to EN 378 standards for low global warming potential (GWP) operation
- Comprehensive safety suite: over-temperature cutoff, low-temperature lockout, dry-run protection, and level-sensing float switch with visual/audible alarm activation
- Modular design with front-access service panels, tool-free pump impeller removal, and standardized electrical interfaces for field maintenance
- Optional multi-segment programmable controller enabling up to 7 independent protocols, each comprising 63 programmable steps with time resolution of 1 minute and temperature resolution of 0.01 °C
Sample Compatibility & Compliance
These circulating baths accommodate a wide variety of thermal transfer media—including deionized water, silicone oil (up to 100 °C), and ethylene glycol/water mixtures—enabling compatibility with diverse sample containers (glass, stainless steel, PTFE-lined vessels) and external equipment interfaces (e.g., 1/4″ NPT, G1/4″ BSP). Units comply with IEC 61010-1:2010 for laboratory electrical safety and meet EMC requirements per EN 61326-1:2013. For regulated environments, optional audit-trail-enabled firmware supports 21 CFR Part 11-compliant electronic records when paired with validated data acquisition software. Documentation packages include factory calibration certificates traceable to NIM (National Institute of Metrology, China) and optional IQ/OQ documentation templates aligned with GLP and GMP validation frameworks.
Software & Data Management
Standard models support analog voltage output (0–5 V or 4–20 mA) for integration into SCADA or PLC systems. Optional digital connectivity includes RS-485 Modbus RTU protocol for remote parameter read/write and status monitoring, as well as USB host mode for direct logging to FAT32-formatted USB flash drives. Time-stamped temperature logs (with configurable sampling intervals from 1 s to 60 min) are stored in CSV format for post-processing in MATLAB, Python (pandas), or Excel. When connected to a Windows PC via USB or RS-485, the included Yiheng LabControl Suite provides real-time graphing, alarm history review, and report generation compliant with ISO 17025 clause 7.7 (result reporting). All firmware updates are delivered via signed binary packages to ensure integrity and version control.
Applications
- Calibration of temperature-sensitive instruments (thermocouples, RTDs, infrared sensors) under controlled thermal gradients
- Stabilization of optical components in interferometry, ellipsometry, and laser cavity alignment setups
- Thermal conditioning of samples prior to rheological, DSC, or TGA analysis
- Temperature control of jacketed bioreactors, chromatography columns, and electrophoresis apparatus
- Accelerated aging studies in polymer, pharmaceutical, and coating development per ASTM D3045 and ISO 2812-3
- Material testing under defined thermal cycling profiles (e.g., thermal shock simulation per MIL-STD-810H Method 502.7)
FAQ
What is the difference between MP/MPG and MPE/MPGE series?
The MP and MPG models provide standard laboratory-grade temperature control (±0.1 °C accuracy), while the MPE and MPGE variants integrate higher-resolution sensing, tighter PID tuning, and enhanced thermal mass management to achieve ±0.02 °C stability—suitable for metrology and calibration applications.
Can these baths be used with flammable solvents?
No. These units are not explosion-proof and must only be operated with non-flammable, thermally stable heat transfer fluids. Silicone oils and aqueous glycol solutions are approved; acetone, ethanol, or hydrocarbon-based baths are strictly prohibited.
Is external circulation pressure sufficient for tall column setups?
Yes. The integrated pressure-suction pump delivers up to 0.35 bar (3.5 m H₂O) head pressure, sufficient to drive flow through vertical loops up to 3 meters in height with typical tubing configurations (¼″ ID PTFE or stainless steel).
