Shanghai Yiheng MP Series Precision Circulating Water Bath with External Loop Capability

Overview

The Shanghai Yiheng MP Series Precision Circulating Water Bath represents a mature engineering platform developed through iterative refinement of thermal control systems and integration of validated German design principles. Engineered for precision temperature maintenance in both internal bath and externally connected apparatus, this series operates on the principle of forced convection via a high-efficiency centrifugal circulation pump coupled with a microprocessor-controlled PID heating (and refrigeration, in CD-200F models) system. Its core function is to deliver stable, uniform thermal environments—critical for applications requiring strict thermal reproducibility, such as calorimetric calibration, viscometer thermostating, chromatographic column ovens, and material stability testing. Unlike basic immersion baths, the MP Series features dual-loop architecture: an internal loop ensures bath homogeneity, while the external loop enables precise temperature control of ancillary equipment—including reaction jackets, spectroscopic cells, or environmental test chambers—without compromising bath stability.

Key Features

• Microprocessor-based PID temperature controller with high-resolution LCD interface, supporting real-time setpoint adjustment and dynamic deviation compensation.
• Dual-mode circulation: selectable internal-only or internal–external dual-loop operation with independent flow regulation (0–100% adjustable pump speed).
• Integrated safety architecture including over-temperature cut-off, low-temperature alarm, and liquid-level sensor-triggered shutdown to prevent dry-run damage and sample loss.
• Multi-segment programmable control (up to 7 programs × 9 steps each; total 63 steps), with user-defined ramp rates, soak durations (1 min to 99 h 59 min), and scheduled power-on/power-off events.
• Stainless steel bath chamber with corrosion-resistant interior finish and reinforced structural geometry for long-term dimensional stability under thermal cycling.
• Standardized external port configuration (G1/4″ BSP female threads) compatible with common laboratory tubing (PTFE, silicone, or fluoropolymer-lined) and pressure-rated quick-connect fittings.

Sample Compatibility & Compliance

The MP Series accommodates a broad range of sample containers—from standard glass beakers and jacketed reactors to custom-engineered vessels—provided they remain within the specified bath volume and thermal mass limits. All models comply with IEC 61010-1:2010 for electrical safety in laboratory equipment and meet EMC requirements per EN 61326-1:2013. For regulated environments, the programmable controller supports electronic record generation suitable for 21 CFR Part 11–aligned data integrity workflows when paired with validated third-party software. The system’s thermal stability profile (±0.03 °C at optimal load conditions) satisfies ASTM E1137/E1137M for thermometer calibration baths and aligns with ISO 17025 clause 5.5.2 regarding equipment performance verification.

Software & Data Management

While the MP Series operates autonomously via its onboard controller, optional RS232/RS485 serial interfaces enable bidirectional communication with host PCs running compliant laboratory information management systems (LIMS) or SCADA platforms. Logged temperature traces, program execution status, and alarm history can be exported in CSV format for traceability. Audit trail functionality—including operator ID tagging, timestamped parameter changes, and immutable event logging—is available through Yiheng’s certified LabControl Suite (v3.2+), which supports IQ/OQ documentation templates aligned with GAMP 5 guidelines. No cloud connectivity or proprietary firmware updates are required for routine operation.

Applications

• Thermostating of rotational rheometers, capillary viscometers, and density meters in QC laboratories (ASTM D445, ISO 3104).
• Temperature control of HPLC/GC detector cells, autosampler trays, and column ovens in analytical chemistry workflows.
• Accelerated stability studies per ICH Q1A(R3), where precise thermal exposure across multiple time points is mandatory.
• Calibration of platinum resistance thermometers (PRTs), thermistors, and liquid-in-glass thermometers against NIST-traceable references.
• Material testing of polymers, adhesives, and coatings under controlled thermal gradients (ISO 294-4, ASTM D6988).
• Cell culture incubation support systems requiring auxiliary temperature buffering and redundancy.

FAQ

What is the maximum allowable external load volume for stable temperature control?
For sustained stability within ±0.1 °C, the external circuit volume should not exceed 3× the internal bath volume. Larger external loads require extended equilibration and may reduce effective resolution.
Does the CD-200F model support simultaneous heating and cooling?
No—it operates in either heating or refrigeration mode, selected manually. Precise sub-ambient control is achieved via compressor-based cooling; heating uses resistive elements only.
Can the controller store user-defined calibration offsets?
Yes. A two-point offset correction (span and zero) can be applied to compensate for sensor drift or systematic bath gradient effects.
Is the circulation pump compatible with organic solvents?
The standard pump housing and impeller are rated for water and aqueous glycol mixtures only. For solvent compatibility (e.g., ethanol, acetone), fluoropolymer-sealed pump modules must be specified at order entry.
How often does the system require preventive maintenance?
Biannual inspection of pump seals, heater terminals, and level sensor contacts is recommended. Full recalibration against a reference PRT is advised annually or after 500 operational hours.