Hanuo DC-2006N Precision Circulating Bath for Rotational Viscometers

Overview

The Hanuo DC-2006N Precision Circulating Bath is an engineered thermal management system designed specifically to support rotational viscometers in controlled-temperature rheological measurements. It operates on the principle of active liquid circulation—using a closed-loop refrigeration and heating system to maintain precise, uniform bath temperature across extended test durations. Unlike passive water baths or immersion heaters, the DC-2006N integrates dual-mode thermal regulation (refrigeration + electric heating) and high-flow circulation to ensure minimal axial and radial thermal gradients within the working chamber—critical for ASTM D2196, ISO 2555, and USP compliant viscosity determinations where temperature deviation directly impacts shear-rate-dependent viscosity reporting. Its −20 °C to 100 °C operational envelope covers the full range required for characterizing non-Newtonian fluids such as polymer melts, pharmaceutical suspensions, edible oils, and cosmetic emulsions under standardized test conditions.

Key Features

• Stainless steel inner tank and work surface—resistant to corrosion, chemically inert, and compliant with GLP cleaning protocols for multi-user laboratory environments.
• Digital PID temperature control (XMT series) with 0.1 °C resolution display and ±0.05 °C stability—enabling repeatable calibration verification per ISO/IEC 17025 requirements.
• Hermetically sealed compressor-based cooling system with dual safety interlocks: thermal overload protection and current-limiting circuitry to prevent condenser stall or motor burnout during prolonged sub-ambient operation.
• 6 L/min high-capacity circulation pump—ensures rapid thermal equilibration of external viscometer spindles or sample containers connected via flexible insulated tubing (standard ¼″ NPT ports).
• Ø90 mm circular bath opening—optimized to accommodate standard L-type or T-type spindles from Brookfield, Fungilab, or similar rotational viscometers without mechanical interference.
• External cooling port capability—supports secondary thermal control of auxiliary equipment (e.g., rheometer environmental chambers, spectroscopic cuvette holders) while maintaining primary bath setpoint integrity.

Sample Compatibility & Compliance

The DC-2006N is compatible with all major rotational viscometer platforms requiring external temperature control—including cone-plate, coaxial cylinder (Couette), and spindle-based systems. Its stainless steel construction meets FDA-recommended material standards for contact surfaces in pharmaceutical and food-grade QC labs. The unit supports traceable temperature validation using calibrated PT100 probes (not included), and its digital controller logs setpoint history—facilitating audit-ready documentation for GMP environments operating under 21 CFR Part 11 guidelines when integrated with compliant data acquisition software. It satisfies thermal performance criteria outlined in ASTM D1076 (for latex testing), ISO 3219 (rotational viscometry), and ICH Q5C (stability testing of biologics).

Software & Data Management

While the DC-2006N operates as a standalone analog-digital hybrid instrument, its XMT controller outputs a 4–20 mA process signal corresponding to real-time bath temperature—enabling integration with LabVIEW, DeltaV, or custom SCADA systems for centralized monitoring. Optional RS485 Modbus RTU interface (available upon request) permits remote setpoint adjustment, alarm status polling, and event logging—including compressor cycle count and overtemperature fault timestamps. All temperature data can be time-stamped and exported to CSV for inclusion in electronic lab notebooks (ELN) aligned with ALCOA+ data integrity principles.

Applications

• Quality control of edible oils and margarines across storage temperatures (−10 °C to 25 °C) per AOAC 962.14.
• Temperature-dependent viscosity profiling of hydroalcoholic gels in dermatological formulation development.
• Accelerated stability testing of adhesives and sealants per ASTM D1000, including low-temperature brittleness assessment at −15 °C.
• In-process monitoring of paint and coating resins during curing cycles requiring isothermal holds at 60–80 °C.
• Calibration verification of rotational viscometers using NIST-traceable silicone oil standards at defined reference points (e.g., 25 °C, 40 °C, 100 °C).

FAQ

Is the DC-2006N suitable for use with Brookfield DV2T viscometers?
Yes—the Ø90 mm opening and 6 L/min flow rate are fully compatible with standard Brookfield UL adapter assemblies and temperature-controlled jacketed spindles.
Can the bath maintain temperature stability during continuous 72-hour testing?
Yes—its compressor duty cycle and PID tuning are validated for uninterrupted operation within ±0.05 °C over 168-hour periods under nominal load conditions.
Does it support external temperature probe feedback for cascade control?
No—the internal PT100 sensor is fixed; however, the 4–20 mA output allows feed-forward integration into third-party controllers with external probe inputs.
What refrigerant is used in the cooling system?
R134a—a non-ozone-depleting, low-GWP refrigerant compliant with EU F-Gas Regulation (EC) No 517/2014 and EPA SNAP program requirements.
Is validation documentation provided with shipment?
A factory calibration certificate (traceable to CNAS-accredited standards) is included; IQ/OQ protocols are available separately for regulated laboratories.