Scientz GDH-2006 High-Precision Low-Temperature Circulating Bath (Heating & Cooling)

Overview

The Scientz GDH-2006 High-Precision Low-Temperature Circulating Bath is an engineered thermal management system designed for laboratory environments requiring tight, reproducible temperature control across a wide operational range (−20 °C to +100 °C). It operates on the principle of forced liquid circulation—using a precisely regulated refrigeration and heating subsystem to maintain uniform thermal conditions within its stainless-steel bath chamber and/or external process loops. The unit integrates a high-efficiency hermetic compressor (Secop, Germany), environmentally compliant R-134a refrigerant, and a microprocessor-based PID controller with adaptive tuning algorithms. Unlike passive water baths, the GDH-2006 actively circulates temperature-controlled fluid via a variable-speed pump, enabling both internal homogenization and stable external load conditioning—making it suitable not only as a reference thermal environment but also as a secondary cold/hot source for calorimeters, viscometers, spectrophotometers, or custom experimental rigs.

Key Features

• High-stability thermal regulation: Achieves ±0.005 °C short-term stability (at setpoints near ambient) and ±0.02 °C over full range, validated per ISO/IEC 17025 traceable procedures.
• Dual-mode thermoregulation: Seamless transition between active cooling and heating without manual intervention; no heater-cooler conflict due to coordinated power modulation.
• Intelligent circulation architecture: Switchable internal/external loop mode with adjustable flow rate (0–20 L/min), pressure-compensated outlet, and dry-run protection.
• Robust safety framework: Compressor overload and overtemperature cutoffs; high/low liquid level detection; overtemperature alarm with latching shutdown; optional external probe input for cascade control.
• Power resilience: Non-volatile memory retains all user parameters—including setpoint, ramp rate, timer, and PID coefficients—after power interruption; resumes operation automatically upon restoration.
• Low-noise operation: Secop VD13 compressor and optimized acoustic insulation reduce operational noise to ≤48 dB(A) at 1 m distance, meeting ISO 7779 requirements for quiet lab zones.

Sample Compatibility & Compliance

The GDH-2006 accommodates aqueous, ethylene glycol–water mixtures (up to 50% v/v), silicone oils (cSt ≤ 100), and other non-corrosive heat-transfer fluids compatible with 304 stainless steel and EPDM seals. Its bath chamber (260 × 200 × 140 mm) supports immersion of standard laboratory vessels up to Ø150 mm × 200 mm height. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements under the EU Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU. For regulated environments, optional firmware enables audit-trail logging (user actions, setpoint changes, alarms) aligned with FDA 21 CFR Part 11 data integrity principles when paired with Scientz’s certified LabControl Suite.

Software & Data Management

The GDH-2006 features RS-232 and optional RS-485/Ethernet interfaces supporting Modbus RTU/TCP protocol for integration into centralized lab automation systems (e.g., LabVantage, STARLIMS). Scientz LabControl Suite (v3.2+) provides real-time remote monitoring, multi-point temperature profiling, programmable ramp/soak sequences, and CSV-exportable time-series data with metadata (timestamp, setpoint, actual temp, pump speed, compressor status). All logged data include digital signatures and are stored with SHA-256 hash verification to satisfy GLP/GMP documentation requirements.

Applications

• Calibration of contact temperature sensors (RTDs, thermistors, thermocouples) per ASTM E74 and ISO 17025 calibration protocols.
• Thermal validation of analytical instrumentation—HPLC column ovens, GC injectors, DSC sample stages—under ISO 17025-accredited quality systems.
• Material property testing: Coefficient of thermal expansion (CTE) measurements, viscosity-temperature profiling (ASTM D445), and phase-change characterization.
• Biological incubation support: Maintaining precise thermal conditions for enzyme kinetics assays, protein denaturation studies, or cell culture equipment pre-conditioning.
• Industrial QC workflows: Temperature uniformity mapping in metrology labs, thermal shock simulation prep, and reference bath validation for ISO/IEC 17025 accredited testing facilities.

FAQ

What is the maximum external load capacity supported by the GDH-2006?

The unit delivers up to 20 L/min at ≤1.2 bar differential pressure, supporting external heat exchangers or jacketed reactors with thermal loads ≤1.8 kW at ΔT = 20 °C.
Can the GDH-2006 be used with silicone oil? What viscosity limit applies?

Yes—fluids up to 100 cSt at 25 °C are compatible; higher viscosities require reduced flow rates and may impact stability performance.
Is NIST-traceable calibration documentation available?

Factory calibration certificates (with uncertainty budgets per ISO/IEC 17025) are provided; optional on-site verification by Scientz-accredited metrology partners is available.
Does the system support programmable temperature ramps?

Yes—up to 10 segment ramp/soak profiles can be defined locally or via LabControl Suite, with ramp rates from 0.1 to 10 °C/min.
How is temperature uniformity verified inside the bath chamber?

Uniformity is characterized using a 9-point grid (per ASTM E220) at three depths; typical deviation is ≤±0.015 °C at 25 °C and ≤±0.03 °C at −20 °C.