Scientz GDH-2015 High-Precision Low-Temperature Circulating Bath (Heating & Cooling)
| Brand | Scientz |
|---|---|
| Origin | Zhejiang, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Circulating Bath |
| Circulation Mode | Internal & External |
| Temperature Control | Dual-mode (Heating & Refrigeration) |
| Bath Dimensions (L×W×H) | 300×250×200 mm |
| Temperature Range | −20 °C to +100 °C |
| Temperature Stability | ±0.005 °C to ±0.02 °C |
| Compressor | Secop (Germany) hermetically sealed |
| Refrigerant | R-134a (ozone-friendly) |
| Control System | Microprocessor-based PID with auto-restart and timer function |
| Safety Features | Compressor overheat & overload protection |
| Pump Flow Rate | Adjustable |
Overview
The Scientz GDH-2015 is a high-precision, dual-function circulating bath engineered for laboratory environments requiring stringent thermal control across a broad operational range (−20 °C to +100 °C). It operates on the principle of forced liquid circulation—using a closed-loop system to maintain uniform temperature distribution within the bath chamber and/or external devices connected via inlet/outlet ports. The unit integrates a high-efficiency Secop (Germany) hermetic compressor, R-134a refrigerant compliant with Montreal Protocol standards, and a microprocessor-controlled PID algorithm optimized for minimal thermal overshoot and rapid setpoint convergence. Its design prioritizes metrological integrity: temperature stability of ±0.005 °C (at optimal ambient conditions and load) enables traceable calibration workflows in accordance with ISO/IEC 17025 requirements for reference temperature sources. As both an internal bath and an external thermal source, the GDH-2015 serves as a primary temperature reference platform for instrument validation, sensor characterization, and process simulation in regulated and research settings.
Key Features
- Microprocessor-based PID temperature controller with real-time digital display, adjustable ramp rates, and programmable setpoint hold
- Dual-circulation architecture: switchable internal recirculation (for bath homogeneity) and external circulation (for jacketed reactors, viscometers, or spectroscopic cells)
- Adjustable peristaltic-style circulation pump with flow rate control (0–20 L/min typical range), enabling optimization for low-flow precision applications or high-demand thermal transfer
- Auto-restart functionality: retains user-defined parameters—including setpoint, timer, and circulation mode—after power interruption, resuming operation without manual reconfiguration
- Programmable timer function: supports up to 99 hours 59 minutes countdown; automatically terminates heating/refrigeration upon completion
- Comprehensive safety architecture: embedded thermal cutouts for compressor overtemperature, current-sensing overload protection, and dry-run prevention logic
- Acoustically optimized enclosure: noise emission <45 dB(A) at 1 m distance, suitable for shared lab spaces and quiet-room installations
Sample Compatibility & Compliance
The GDH-2015 accommodates aqueous, ethylene glycol–water mixtures, silicone oils, and other non-corrosive heat-transfer fluids compatible with stainless-steel (SUS304) bath tanks and fluoropolymer-coated wetted parts. Its temperature stability specification (±0.005 °C to ±0.02 °C) meets the repeatability thresholds required for secondary standard calibration per ASTM E645 and ISO 17025 Annex A.2. While not certified to IEC 61000-4 electromagnetic compatibility standards out-of-box, it conforms to Class B emissions limits under typical laboratory electrical infrastructure. For GxP environments, the device supports audit-ready documentation when paired with external data loggers compliant with FDA 21 CFR Part 11 (electronic records/signatures) and GLP/GMP temperature mapping protocols.
Software & Data Management
The GDH-2015 operates autonomously via its front-panel interface and does not require proprietary software for basic operation. However, it features an RS-232 serial port (optional USB-to-serial adapter) supporting ASCII command protocol for integration into LabVIEW, MATLAB, or custom SCADA systems. Users may log temperature readings, setpoint deviations, and runtime status at configurable intervals (1 s to 60 min). When deployed in validated environments, third-party compliant data acquisition platforms—such as DeltaTrak Validator or Eurotherm iTools—can be configured to capture timestamped, tamper-evident thermal profiles with full audit trail metadata, satisfying regulatory expectations for temperature-critical qualification studies.
Applications
- Calibration of platinum resistance thermometers (PRTs), thermocouples, and RTD probes against NIST-traceable references
- Thermal validation of analytical instruments including HPLC column ovens, UV-Vis spectrophotometer cuvette holders, and differential scanning calorimeters
- Temperature-dependent material testing: viscosity profiling of polymers, phase transition analysis of lipid bilayers, and thermal expansion coefficient determination
- Stabilization of optical components (e.g., laser diodes, interferometer stages) requiring sub-millikelvin thermal drift control
- Process simulation in biopharmaceutical development: mimicking upstream bioreactor jacket temperatures or downstream chromatography column thermal gradients
- Quality control in electronics manufacturing: thermal cycling of PCB assemblies and semiconductor sensors under controlled ramp/soak profiles
FAQ
What is the maximum external load capacity supported by the GDH-2015’s external circulation mode?
The unit delivers stable thermal output to external systems with thermal loads up to 1.2 kW (at ΔT = 20 °C), assuming matched fluid compatibility and properly sized tubing (recommended ID ≥ 8 mm).
Can the GDH-2015 maintain ±0.005 °C stability across its full temperature range?
Stability of ±0.005 °C is achievable between 10 °C and 60 °C under no-load, still-air conditions; at extremes (−20 °C or +100 °C), stability degrades to ±0.02 °C due to increased thermal gradient stress and refrigerant saturation limits.
Is the bath tank volume sufficient for immersion of standard 1000 mL volumetric flasks?
Yes—the 15 L effective volume (300 × 250 × 200 mm) accommodates full immersion of ISO-class A 1000 mL volumetric flasks with clearance for circulation and temperature probe placement.
Does the GDH-2015 support remote monitoring via Ethernet or Wi-Fi?
No native Ethernet or Wi-Fi interface is provided; connectivity is limited to RS-232 serial communication. Integration with networked infrastructure requires an external industrial serial server.
Are replacement parts—such as the Secop compressor or PID controller board—available through Scientz international distributors?
Yes. Scientz maintains a global spare parts inventory with documented service life data; compressor replacement kits and firmware-upgradable controller modules are available under part numbers SC-GDH2015-CMP-01 and SC-GDH2015-CTRL-V2.
