Scientz GH-15 High-Precision Circulating Bath (Heating & Cooling)
| Brand | Scientz |
|---|---|
| Origin | Zhejiang, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | GH-15 |
| Instrument Type | Circulating Temperature Bath |
| Circulation Mode | Internal & External |
| Temperature Control | Dual-mode (Heating & Refrigeration) |
| Bath Chamber Dimensions | 300 × 240 × 200 mm (L×W×H) |
| Temperature Range | +5 °C to +100 °C |
| Temperature Stability | ±0.005 °C to ±0.02 °C |
| Refrigerant | Environmentally Compliant (R134a or equivalent) |
Overview
The Scientz GH-15 High-Precision Circulating Bath is an engineered thermal management system designed for laboratory-grade temperature control in both heating and cooling modes. Based on a closed-loop liquid circulation architecture, it utilizes a dual-stage thermoelectric or compressor-based refrigeration system paired with precision resistive heating elements to maintain highly stable thermal environments. The bath operates on the principle of forced convection via a variable-speed centrifugal pump, enabling uniform heat transfer across the working fluid—typically deionized water, silicone oil, or ethanol—within its 14.4 L (300 × 240 × 200 mm) chamber. Its core function is to serve as a reference thermal source or sink for calibration, material testing, sensor validation, and process simulation where sub-0.02 °C stability over extended durations is required. Unlike basic immersion baths, the GH-15 supports bidirectional external load regulation via its dedicated inlet/outlet ports and pressure-regulated flow control, making it suitable for jacketed reactors, viscometers, spectrophotometer cells, and other externally coupled instrumentation.
Key Features
- High-stability temperature control with real-time PID algorithm execution on an embedded microprocessor; adaptive tuning eliminates overshoot and minimizes settling time.
- Dual-mode operation: seamless transition between heating (+5 °C to +100 °C) and active refrigeration (down to +5 °C), enabled by environmentally compliant refrigerant (R134a-equivalent) and corrosion-resistant evaporator coils.
- Programmable auto-restart function: retains all setpoints and operational states after power interruption; user-selectable startup mode (standby or immediate ramp).
- Configurable timer function: precise 1-minute to 99-hour 59-minute countdown with automatic shutdown upon completion—critical for unattended calibration cycles.
- Adjustable flow rate (0–20 L/min typical range) with pressure-compensated external circulation; integrated flow monitoring ensures consistent thermal delivery to auxiliary equipment.
- Stainless steel 304 bath tank with reinforced insulation and anti-condensation outer casing; front-panel LED display with intuitive menu navigation and real-time deviation readout (±0.005 °C minimum resolution).
Sample Compatibility & Compliance
The GH-15 accommodates a wide range of heat-transfer media—including aqueous solutions, glycol-water mixtures, mineral oils, and low-viscosity silicones—without degradation of thermal performance or material compatibility. Its internal wetted parts are constructed from electropolished stainless steel and fluoropolymer-sealed components, ensuring resistance to chemical exposure and long-term reliability. The unit complies with IEC 61010-1:2010 safety standards for laboratory electrical equipment and meets CE marking requirements for electromagnetic compatibility (EN 61326-1). While not certified for medical device manufacturing, it is routinely deployed in GLP-compliant laboratories for instrument qualification (IQ/OQ/PQ), per ASTM E2877-22 (Standard Guide for Calibration of Temperature Measurement Systems) and ISO/IEC 17025:2017 clause 6.4.3 on environmental condition control. Optional NIST-traceable calibration documentation is available upon request.
Software & Data Management
The GH-15 includes RS232 and optional RS485 communication interfaces supporting Modbus RTU protocol for integration into centralized lab automation systems (e.g., LabVantage, Thermo Fisher SampleManager). A Windows-compatible configuration utility enables remote parameter setting, real-time data logging (temperature, setpoint, pump status, error codes), and export to CSV or Excel formats. Audit trails—including operator ID, timestamped parameter changes, and system alarms—are retained locally for up to 30 days and support FDA 21 CFR Part 11 compliance when used with validated electronic signature modules. No cloud connectivity or proprietary SaaS platform is included; all firmware updates are delivered via signed USB firmware packages to preserve data sovereignty and cybersecurity integrity.
Applications
- Primary and secondary calibration of platinum resistance thermometers (PRTs), thermistors, and thermocouples against NIST-traceable references.
- Thermal validation of analytical instruments requiring stable thermal input—e.g., HPLC column ovens, DSC sample holders, and FTIR transmission cells.
- Controlled-temperature reaction studies in synthetic chemistry and enzymatic kinetics where ±0.01 °C drift must be excluded as a systematic error source.
- Physical property testing per ASTM D2857 (viscosity), ASTM D1505 (density), and ISO 11357-3 (melting point determination) using externally coupled probes.
- Stability testing of pharmaceutical formulations under ICH Q1A(R2) accelerated conditions, when integrated with humidity-controlled environmental chambers.
FAQ
What is the maximum external load capacity supported by the GH-15’s circulation system?
The GH-15 delivers up to 20 L/min at ≤2.5 bar backpressure, sufficient for most jacketed vessels up to 5 L volume and standard viscometer jackets. For higher-pressure applications, consult the technical datasheet for pump curve specifications.
Does the GH-15 support programmable temperature ramps?
No—ramp/soak profiles require external controller integration via RS232/Modbus. The GH-15 maintains only static setpoints with high-stability hold capability.
Can the bath operate continuously at 100 °C with external circulation?
Yes, provided the external loop uses compatible high-temperature fluid (e.g., silicone oil) and ambient conditions remain below 30 °C. Continuous operation above 90 °C reduces compressor service life; periodic maintenance intervals should be shortened accordingly.
Is the temperature sensor calibrated at the factory?
Each unit ships with a factory calibration certificate covering three points (+20 °C, +50 °C, +80 °C) traceable to national metrology institutes. Full recalibration services are offered annually through Scientz-certified labs.
How is condensation managed during low-temperature operation?
The GH-15 features a double-wall insulated chamber with integrated anti-condensation heating film on the outer shell surface, eliminating moisture accumulation even at +5 °C ambient humidity levels above 60% RH.
