Coolium DX-40A2000 Cryogenic Circulating Thermostat

Overview

The Coolium DX-40A2000 Cryogenic Circulating Thermostat is an engineered solution for stable, high-capacity low-temperature control in demanding laboratory and pilot-scale applications. Operating within a precise temperature range of −50 °C to −20 °C, this vertical cryostat employs a cascade refrigeration architecture—comprising dual-stage compression and optimized heat exchange—to achieve rapid cooldown and exceptional thermal stability (±0.5 °C). Unlike conventional on/off cycling systems, the DX-40A2000 implements non-cycling refrigeration modulation combined with adaptive PID-fuzzy logic control, minimizing thermal overshoot and ensuring reproducible setpoint adherence across extended operation cycles. Its open-bath design supports direct immersion experiments, while its integrated high-flow circulation system (0–28 L/min at 2 bar) enables external cooling of ancillary equipment—including rotary evaporators, bioreactors, jacketed reactors, and analytical instrumentation—without compromising bath integrity or temperature uniformity.

Key Features

• Stainless steel liquid bath (Φ300 mm × 300 mm depth) and fully sealed circulation loop minimize coolant evaporation, oxidation, and contamination—critical for long-term use with synthetic heat transfer oils or low-temperature secondary coolants.
• Industrial-grade, low-temperature circulation pump engineered for continuous operation below −40 °C; features ceramic shaft seals and cryo-optimized motor windings to eliminate leakage, cavitation, and stall under high-viscosity conditions.
• Modular refrigeration system with imported compressors, expansion valves, and condensers—designed for >15,000 hours MTBF and compliant with ISO 5171 and AHRI 540 performance verification standards.
• Configurable primary cooling method: air-cooled (standard) or water-cooled (optional), allowing installation flexibility in laboratories with limited ventilation or elevated ambient temperatures.
• Comprehensive safety architecture including high/low refrigerant pressure monitoring, oil pressure interlock, ground-fault circuit interruption (GFCI), thermal cutout on compressor and pump housings, and real-time leak detection via refrigerant-specific sensors.
• Non-ozone-depleting refrigerant blend (HFC-based, GWP < 1500) certified per EU F-Gas Regulation (EU) No 517/2014 and EPA SNAP Program requirements.

Sample Compatibility & Compliance

The DX-40A2000 accommodates a broad spectrum of sample containers and reactor configurations, including standard 24/40 and 29/42 ground-glass joints, jacketed glass vessels up to 5 L volume, and stainless-steel bioreactor cooling jackets. Its stainless-steel fluid path meets ASTM A240 Type 316L material specifications for corrosion resistance against chloride-containing coolants and organic solvents. The unit is designed to support GLP-compliant workflows: all temperature setpoints, actual bath readings, and alarm events are timestamped and stored locally (12-month log capacity); optional RS485/Modbus RTU or Ethernet TCP/IP interface enables integration into LIMS or SCADA platforms for audit-trail generation per FDA 21 CFR Part 11 requirements. CE marking confirms conformity with EN 61000-6-2 (EMC immunity) and EN 61000-6-4 (EMC emissions) standards.

Software & Data Management

Embedded firmware provides intuitive local control via a 5.7″ TFT LCD touchscreen with multi-language UI (English, German, French, Chinese). Real-time graphs display bath temperature, outlet/inlet differential, flow rate, and compressor discharge temperature. All operational parameters—including ramp rates, hold times, and safety thresholds—are programmable and password-protected. Optional CooliumLink™ PC software (Windows/Linux/macOS) enables remote monitoring, automated data export (CSV/Excel), script-based temperature profiling, and synchronized logging with external instruments via TTL or analog I/O triggers. Audit logs include operator ID, parameter changes, and system fault codes—fully traceable for internal quality audits or regulatory inspections.

Applications

• Cryogenic reaction control in fine chemical synthesis, particularly Grignard, lithiation, and nitration processes requiring sub−30 °C thermal management.
• Low-temperature condensation and solvent recovery in rotary evaporation systems operating under reduced pressure.
• Temperature stabilization of NMR probe preamplifiers, CCD detectors, and laser diodes in analytical instrumentation suites.
• Process validation studies for pharmaceutical freeze-drying cycles, where controlled shelf-cooling profiles must replicate production-scale thermal gradients.
• Material science testing—including tensile, impact, and dielectric property evaluation—under defined cryogenic conditions per ASTM D790, ISO 179, and IEC 60243 standards.

FAQ

What types of heat transfer media are compatible with the DX-40A2000?
The system is validated for use with silicone-based heat transfer oils (e.g., Dow Corning DC-200 series), polyalphaolefin (PAO) synthetics, and aqueous glycol blends—provided viscosity remains ≤500 cSt at −50 °C. Ethanol or methanol are not recommended due to volatility and material compatibility risks.

Can the unit operate continuously for 72+ hours at −40 °C?
Yes. The DX-40A2000 is rated for unattended 24/7 operation under nominal load (≤1800 W thermal draw) with ambient temperatures ≤30 °C. Continuous duty requires water-cooled configuration in environments exceeding 25 °C ambient.

Is external calibration traceable to NIST or PTB standards supported?
The built-in Pt100 sensor is factory-calibrated to ±0.15 °C accuracy at −40 °C. Optional third-party calibration certificates (NIST-traceable, ISO/IEC 17025 accredited) are available upon request, covering both sensor and controller loop verification.

How is maintenance access structured for the refrigeration system?
Front-access service panels allow full compressor, filter-drier, and expansion valve inspection without disassembly. Refrigerant charging ports conform to SAE J2064 standards and include integrated pressure gauges and moisture indicators.