Scientz DCW-3506 Horizontal Low-Temperature Constant Temperature Bath (Heating & Cooling)

Overview

The Scientz DCW-3506 Horizontal Low-Temperature Constant Temperature Bath is an engineered thermal management system designed for precise, stable, and reproducible temperature control in laboratory and industrial R&D environments. Based on a closed-loop, forced-circulation principle, it maintains uniform thermal conditions within the bath chamber while enabling external temperature transfer via integrated pump-driven fluid circulation. Its dual-mode thermoregulation—combining high-efficiency compressor-based refrigeration with precision resistive heating—enables seamless operation across a wide dynamic range from −20 °C to +100 °C. The unit employs an environmentally compliant non-chlorofluorocarbon (non-CFC) refrigeration cycle, aligning with international environmental directives including the Montreal Protocol and EU F-Gas Regulation. Constructed with corrosion-resistant stainless steel interior and a rigid aluminum-alloy housing, the DCW-3506 delivers mechanical robustness and long-term thermal consistency required for extended-duration experiments and quality assurance protocols.

Key Features

• Non-CFC refrigeration system utilizing a fully sealed air-cooled compressor—ensures low acoustic emission (<55 dB(A)) and eliminates ozone-depleting refrigerants.
• 7-inch high-resolution TFT touchscreen interface with intuitive soft-key navigation; supports multi-point temperature setpoint programming and real-time graphical trend display.
• Advanced adaptive control architecture integrating fuzzy logic and self-tuning PID algorithms—dynamically adjusts heating/refrigeration output based on ambient load, setpoint deviation, and thermal inertia.
• Programmable dual-limit temperature alarm with audible/visual alerts and configurable hysteresis; supports independent upper and lower threshold definition for process safety interlocks.
• DC-controlled circulation pump delivering 0–20 L/min flow rate with linear speed adjustment and up to 5-meter head pressure—optimized for compatibility with external jackets, reactors, or analytical instrumentation requiring auxiliary thermal conditioning.
• Intelligent power-loss recovery: automatic 3-minute delay restart upon power restoration to prevent thermal shock and ensure system stabilization prior to resuming operation.
• Internal bath volume: 280 × 250 × 140 mm (approx. 9.8 L usable capacity); compatible with water, silicone oil, ethylene glycol/water mixtures, and other non-corrosive heat-transfer fluids.

Sample Compatibility & Compliance

The DCW-3506 is validated for use with standard laboratory glassware (e.g., flasks, cuvettes, reaction vessels) and externally jacketed equipment such as spectrophotometer cells, viscometers, calorimeters, and small-scale bioreactors. Its external circulation port enables integration into closed-loop secondary temperature control systems—commonly deployed in ASTM D2570 (viscosity bath calibration), ISO 1628-1 (polymer solution viscosity), and USP compounding environment support applications. The unit conforms to IEC 61010-1:2010 safety standards for electrical equipment used in laboratory settings and meets EMC requirements per EN 61326-1:2013. While not inherently 21 CFR Part 11 compliant, its logging-capable touchscreen firmware supports manual audit-trail documentation suitable for GLP and GMP-aligned workflows when paired with external data capture systems.

Software & Data Management

The embedded firmware supports time-stamped temperature logging at user-defined intervals (1 s to 60 min), with data export via USB flash drive in CSV format. No proprietary software installation is required; raw logs are directly readable in Excel, MATLAB, or LabVIEW. The touchscreen interface retains up to 30 days of local history (circular buffer). Optional RS485 Modbus RTU communication allows integration into centralized SCADA or LIMS platforms for remote monitoring and automated batch reporting—particularly valuable in QC laboratories operating under ISO/IEC 17025 accreditation frameworks.

Applications

• Calibration of temperature-sensitive sensors and transducers (e.g., Pt100 probes, thermistors) per ISO/IEC 17025 Clause 6.5.
• Thermal stability testing of pharmaceutical formulations, polymer melts, and colloidal dispersions under controlled ramp/soak profiles.
• Supporting physical property measurements—including density (ASTM D1298), refractive index (ASTM D1218), and surface tension (ISO 1409)—where bath temperature must remain within ±0.05 °C for measurement traceability.
• Providing auxiliary cooling/heating for HPLC column ovens, GC injectors, and laser diode mounts requiring low-drift thermal anchoring.
• Cell culture incubation support during cryopreservation protocol development and enzyme kinetics assays requiring sub-zero stabilization.

FAQ

What types of heat-transfer fluids are compatible with the DCW-3506 bath?
Deionized water, 30–50% ethylene glycol/water mixtures, and silicone oils (up to 100 cSt viscosity) are recommended. Avoid halogenated solvents, strong acids/bases, or fluids with flash points below 60 °C.
Does the unit support external temperature feedback control?
No—the DCW-3506 operates in open-loop bath-sensor mode only. For closed-loop external probe control, integration with third-party PID controllers via analog voltage output (0–10 V) is required.
Is the bath suitable for long-term unattended operation?
Yes, provided ambient conditions remain within 15–30 °C and relative humidity stays below 80% RH non-condensing. The overtemperature protection and auto-restart features enhance operational continuity.
Can the pump be operated without active temperature control?
Yes—the circulation pump functions independently of heating/refrigeration modules, enabling passive fluid mixing or external loop priming at ambient temperature.
What maintenance intervals are recommended?
Compressor oil and refrigerant integrity should be verified annually by authorized service personnel; bath chamber cleaning and pump impeller inspection are advised every 6 months under continuous use.