Tongzhou Weipu D-Series Benchtop Circulating Chiller for AAS and Analytical Instruments

Overview

The Tongzhou Weipu D-Series Benchtop Circulating Chiller is an engineered thermal management solution specifically designed to support high-precision analytical instrumentation requiring stable, low-noise, and tightly regulated coolant delivery. Unlike general-purpose chillers, the D-Series integrates compressor-based refrigeration with a compact horizontal footprint—optimized for under-bench installation beneath atomic absorption spectrometers (AAS), inductively coupled plasma optical emission spectrometers (ICP-OES), and ICP-mass spectrometers (ICP-MS). Its core function is to maintain instrument heat exchangers, nebulizers, plasma torches, and detector housings within narrow thermal tolerances, thereby ensuring signal stability, baseline reproducibility, and long-term calibration integrity. The chiller operates on a closed-loop glycol-water circulation system, delivering consistent thermal load dissipation across variable ambient conditions—from air-conditioned cleanrooms to warm, humid laboratory environments.

Key Features

• Ultra-low profile horizontal chassis enables seamless integration beneath standard laboratory workbenches (height ≤ 250 mm), preserving valuable benchtop space while minimizing vibration transmission to sensitive optical instruments.
• Wide operational temperature range of −40 °C to +95 °C supports both cryogenic sample introduction systems and high-temperature plasma accessories—critical for method flexibility in multi-technique labs.
• Refrigeration capacity scalable from 800 W to 7200 W ensures compatibility with single AAS units up to full ICP-MS suites, with dynamic load compensation via PID-controlled compressor modulation.
• High-precision temperature regulation with ±0.1 °C stability (at setpoint, steady-state, 2 hr duration) meets the thermal repeatability requirements defined in ASTM E1712 and ISO/IEC 17025 for accredited elemental analysis laboratories.
• Multi-voltage universal power input (100–240 VAC, 50/60 Hz) eliminates need for external transformers and facilitates global deployment without hardware modification.
• Eco-conscious refrigerant formulation complies with current EU F-Gas Regulation (EU No. 517/2014) and EPA SNAP program criteria, supporting sustainability reporting and regulatory audits.

Sample Compatibility & Compliance

The D-Series chiller is validated for continuous duty cycles with AAS systems from PerkinElmer, Thermo Fisher Scientific, Agilent, and Shimadzu—including flame, graphite furnace, and hydride generation configurations. It also interfaces reliably with ICP-OES/MS platforms (e.g., Thermo iCAP RQ, Agilent 5110, PerkinElmer Avio 500), SEM cooling stages, laser ablation cells, and glovebox antechambers. All electrical components conform to IEC 61010-1:2010 safety standards. Thermal control firmware supports audit-ready logging per FDA 21 CFR Part 11 when paired with optional data acquisition modules, and meets GLP/GMP environmental monitoring prerequisites for QC/QA laboratories.

Software & Data Management

Local operation is managed via a backlit LCD interface with intuitive menu navigation and real-time display of setpoint, actual temperature, flow rate, pressure, and compressor status. Optional RS485 (Modbus RTU) or Ethernet (TCP/IP) connectivity enables integration into centralized lab infrastructure management systems (LIMS/LabWare). Logged thermal performance data—including timestamps, deviations, and alarm events—is exportable as CSV for traceability and trending analysis. Firmware updates are performed via USB port with cryptographic signature verification to ensure integrity and compliance continuity.

Applications

• Stabilizing graphite furnace atomizers in AAS to minimize thermal drift during ramped temperature programs (e.g., pyrolysis–atomization sequences per USP ).
• Maintaining constant coolant temperature for ICP torch cooling jackets, directly influencing plasma robustness and oxide formation ratios (CeO/Ce).
• Providing controlled thermal environment for SEM cold stages during low-vacuum or cryo-SEM workflows.
• Regulating coolant supply to laser sources in LIBS or LA-ICP-MS setups where diode temperature affects wavelength stability and pulse energy consistency.
• Supporting temperature-critical digestion steps in automated Kjeldahl nitrogen analyzers and microwave-assisted reaction vessels.

FAQ

Is the D-Series chiller compatible with third-party AAS systems requiring 20% ethylene glycol coolant?
Yes—the internal wetted materials (316 stainless steel reservoir, EPDM seals, brass pump head) are chemically resistant to aqueous glycol mixtures up to 30% concentration.
Can the chiller maintain ±0.1 °C stability at 95 °C under full refrigeration load?
Temperature stability specification applies across the entire range; however, at upper limits (>85 °C), stability is achieved using heater-assisted regulation rather than active refrigeration—verified per ISO 17025 Clause 6.4.3 validation protocol.
Does the unit include flow monitoring and dry-run protection?
Yes—integrated flow sensor and pressure transducer trigger automatic shutdown if flow drops below 10 L/min or pressure falls below 0.8 bar, preventing pump cavitation and heat exchanger damage.
What documentation is provided for regulatory compliance?
Each unit ships with Factory Calibration Certificate (traceable to NIST), CE Declaration of Conformity, RoHS/REACH compliance statement, and Electrical Safety Test Report per IEC 61010-1.