Yuyi DLSB(EX) Explosion-Proof Low-Temperature Circulating Chiller

Overview

The Yuyi DLSB(EX) Explosion-Proof Low-Temperature Circulating Chiller is a precision-engineered refrigeration system designed for safe, stable, and continuous thermal management in hazardous environments where flammable vapors or explosive atmospheres may be present. Utilizing a hermetically sealed, imported full-closed compressor and optimized cascade or single-stage refrigeration architecture (depending on target temperature range), the unit delivers consistent low-temperature coolant circulation—typically using ethanol/water mixtures, silicone oils, or specialized low-freezing-point heat transfer fluids—across laboratory and industrial equipment requiring precise thermal control. Its core function is to maintain stable bath temperatures while providing external closed-loop cooling to sensitive instrumentation such as electron microscopes, X-ray diffractometers, laser systems, vacuum sputtering chambers, and cryogenic reaction setups. The EX variant integrates certified explosion-proof electrical components—including intrinsically safe power distribution, flameproof enclosures, and Class II Group B (IIB) T4-rated motor assemblies—to comply with international hazardous area classification standards for Zone 1/2 gas environments.

Key Features

• Explosion-proof certification per GB 3836.2–2000 (equivalent to IEC 60079-1), with Ex d IIB T4 marking for use in potentially explosive atmospheres containing propane-, ethylene-, or hydrogen-class gases.
• Digital PID temperature controller with ±0.1 °C stability over full operating range; adjustable setpoint resolution of 0.1 °C and real-time display of bath temperature and outlet fluid temperature.
• Stainless steel reservoir and internal circulation loop—resistant to corrosion, oxidation, and low-temperature embrittlement—ensuring long-term compatibility with high-purity solvents and deionized water.
• Integrated safety protections: phase failure detection, overvoltage/undervoltage lockout, thermal overload cutoff, current surge limiting, ground fault interruption, and delayed compressor restart to prevent mechanical stress.
• Modular design supporting multiple configurations: standard models (DLSB-10L/20L/30L/50L/100L) with scalable refrigeration capacity and optional magnetic stirring integration (with adjustable speed and immersion depth compatibility).
• Optimized for 220 V / 50 Hz mains supply—engineered specifically for Chinese grid conditions without voltage conversion requirements—minimizing operational risk and energy loss.

Sample Compatibility & Compliance

The DLSB(EX) is compatible with a broad spectrum of low-viscosity, non-aggressive heat transfer media including aqueous glycol solutions, ethanol–water blends, and synthetic silicone-based coolants. It is not intended for use with strong acids, alkalis, halogenated hydrocarbons, or chlorinated solvents due to material compatibility constraints. All wetted parts conform to ISO 8502-3 surface cleanliness standards for laboratory-grade stainless steel (AISI 304/316). The unit meets mandatory safety requirements under China’s national standard Q/SHJFO2–2009 and aligns with general-purpose testing protocols referenced in ASTM E2654 (Standard Guide for Validation of Thermal Management Systems) and ISO/IEC 17025–2017 (for laboratories performing calibration of temperature-controlled equipment). While not inherently 21 CFR Part 11 compliant, its digital controller supports audit-trail-ready data logging when interfaced with validated third-party SCADA or LIMS platforms.

Software & Data Management

The DLSB(EX) operates via embedded firmware with no proprietary software dependency. Temperature setpoints, operational status, and alarm history are accessible through the front-panel LCD interface. Optional RS485 Modbus RTU communication enables integration into centralized facility monitoring systems for remote start/stop commands, temperature telemetry, and fault reporting. Logged parameters include cumulative compressor runtime, number of thermal cycles, maximum deviation from setpoint, and timestamped safety event records—supporting GLP-compliant maintenance documentation and preventive service scheduling. Data export requires external Modbus-to-CSV gateway hardware; no cloud connectivity or vendor-hosted platforms are included.

Applications

This chiller serves critical roles in research and production settings where both thermal precision and intrinsic safety are non-negotiable. Primary applications include: sustained cooling of transmission electron microscope (TEM) column housings; temperature stabilization of magnetron sputtering targets during thin-film deposition; thermal conditioning of superconducting quantum interference device (SQUID) electronics; cryogenic sample preparation for X-ray photoelectron spectroscopy (XPS); and controlled low-temperature reaction quenching in pharmaceutical process development. It is routinely deployed alongside rotary evaporators, freeze dryers, bioreactors, and vacuum gloveboxes—particularly where solvent vapors (e.g., diethyl ether, acetone, THF) necessitate Class I Division 1/Zone 1 rated auxiliary equipment. In metallurgical R&D, it supports zone-refining of high-purity germanium or gallium arsenide under inert atmosphere gloveboxes equipped with explosion-proof interlocks.

FAQ

What temperature ranges are supported across DLSB(EX) model variants?

Standard configurations cover –20 °C, –30 °C, –40 °C, –60 °C, –80 °C, and –120 °C nominal setpoints. Actual achievable minimum temperature depends on ambient conditions, heat load, and selected coolant—refer to individual model datasheets for derating curves.

Can the unit be integrated with third-party instruments requiring analog or digital control signals?

Yes—via optional 0–10 V or 4–20 mA analog interface (hardware add-on), or native Modbus RTU over RS485 for bidirectional communication with PLCs or lab automation controllers.

Is the stainless steel reservoir electropolished for ultra-high-purity applications?

Standard units feature mechanically polished AISI 304 stainless steel. Electropolished 316L variants are available under custom order (lead time +8 weeks) for semiconductor or biopharma cleanroom deployment.

Does the DLSB(EX) support external flow rate modulation?

All models include a calibrated bypass valve and pressure-regulated circulation pump. Flow rates are manually adjustable between 0–25 L/min depending on model; variable-frequency drive (VFD) pumps are offered as OEM upgrades.

What documentation is provided for regulatory validation?

Factory calibration certificates (traceable to NIM China), explosion-proof component certifications (CNEx), CE Declaration of Conformity (for EU export variants), and complete electrical schematics are supplied with each unit. IQ/OQ protocol templates are available upon request for GMP-aligned installations.