Tianfeng LS-8HP Air-Cooled Low-Temperature Circulating Chiller

Overview

The Tianfeng LS-8HP Air-Cooled Low-Temperature Circulating Chiller is an integrated, industrial-grade temperature control system engineered for precision thermal management of high-heat-load laboratory and production equipment. Unlike water-cooled chillers requiring external cooling towers or facility water loops, this unit employs a forced-air condensing system with high-efficiency scroll compressors and optimized finned-tube heat exchangers—enabling reliable operation in environments where chilled water infrastructure is unavailable or impractical. It maintains stable coolant temperatures between 0 °C and 10 °C with a certified stability of ±0.1 °C under dynamic load conditions, achieved via PID-controlled refrigerant expansion valves (imported from Italy and Germany), dual-stage temperature sensing, and real-time feedback regulation of pump speed and compressor capacity. Designed for continuous-duty applications, the chiller delivers 24.9 kW of cooling capacity at standard rating conditions (inlet water 12 °C, outlet water 7 °C, ambient air 30 °C inlet / 40 °C outlet). Its compact footprint and integrated architecture eliminate external piping complexity while supporting direct connection to analytical instruments with demanding thermal stability requirements.

Key Features

• Integrated air-cooled design eliminates dependency on facility cooling water or cooling towers
• High-reliability scroll compressor with built-in overload protection and low-vibration mounting
• Stainless steel reservoir (180 L) and centrifugal circulation pump rated for continuous operation at up to 2.0 bar pressure and 60 L/min flow
• Dual-sensor PID temperature controller with digital display (optional RKC controller available for enhanced traceability)
• Comprehensive safety suite: high/low refrigerant pressure monitoring, compressor overtemperature cutoff, outlet water overtemperature alarm, flow fault detection, and phase-loss protection
• IP54-rated electrical cabinet with Siemens/Schneider/OMRON contactors, relays, and circuit protection
• Low-noise operation (≤72 dB(A)) achieved through acoustic insulation, vibration-dampened mounting, and optimized fan blade geometry
• Modular internal layout facilitating field serviceability and component-level replacement

Sample Compatibility & Compliance

The LS-8HP is compatible with a broad range of laboratory and industrial instrumentation requiring stable low-temperature coolant supply—including graphite furnace atomic absorption spectrometers (GFAAS), inductively coupled plasma optical emission spectrometers (ICP-OES), ICP-mass spectrometers (ICP-MS), X-ray fluorescence (XRF) and X-ray diffraction (XRD) systems, scanning electron microscopes (SEM), transmission electron microscopes (TEM), laser processing platforms (cutting, welding, marking), and high-speed spindles. Its output temperature range (0–10 °C) and tight stability (±0.1 °C) meet the thermal preconditioning requirements specified in ASTM E1655 (for spectroscopic calibration), ISO/IEC 17025 (for accredited lab thermal environment control), and USP (analytical instrument qualification). The unit complies with CE marking directives (2014/30/EU EMC, 2014/35/EU LVD), RoHS 2011/65/EU, and GB/T 19001–2016 (equivalent to ISO 9001:2015). All electrical components conform to IEC 60204-1 for industrial machinery safety.

Software & Data Management

While the standard LS-8HP operates via local HMI with analog/digital inputs and relay outputs, optional RS485 Modbus RTU communication enables integration into centralized facility monitoring systems (BMS/SCADA). The controller logs operational parameters—including inlet/outlet temperatures, runtime hours, compressor cycles, and fault codes—with timestamped records stored in non-volatile memory. When equipped with the optional RKC controller, the unit supports audit-trail functionality compliant with FDA 21 CFR Part 11 requirements, including user access levels, electronic signatures, and immutable event logging. Data export is supported via USB interface (CSV format) for GLP/GMP documentation and preventive maintenance scheduling. Remote monitoring and alarm notification (via dry-contact relay or optional Ethernet module) support unattended 24/7 operation in regulated laboratory environments.

Applications

• Materials Characterization: Thermal stabilization of XRD goniometers, SEM/TEM cold stages, and XRF sample chambers to minimize thermal drift during long-duration scans
• Elemental Analysis: Precise coolant temperature control for GFAAS graphite tube ovens and ICP torch interfaces, reducing plasma instability and spectral noise
• Laser Systems: Heat extraction from CO₂, fiber, and ultrafast laser gain media and optics mounts to maintain beam pointing stability and wavelength fidelity
• Manufacturing Metrology: Temperature conditioning of coordinate measuring machine (CMM) granite bases and air-bearing guideways to limit thermal expansion errors
• Pharmaceutical QC: Support of dissolution testers, stability chambers, and lyophilizer condenser plates per ICH Q5C and USP
• Electronics Testing: Thermal management of burn-in racks, wafer probers, and RF power amplifiers during accelerated life testing

FAQ

What is the maximum allowable return water temperature for continuous operation?
The chiller is rated for continuous duty with return water temperatures up to 40 °C. Sustained inlet temperatures above this threshold may trigger high-pressure cutout and reduce compressor service life.
Can the LS-8HP be used with deionized or glycol-water mixtures?
Yes—the stainless steel reservoir, pump, and heat exchanger are compatible with 0–30% ethylene or propylene glycol solutions and deionized water. Note that glycol reduces effective cooling capacity and increases viscosity-related pressure drop.
Is remote start/stop and setpoint adjustment supported?
Standard units include 24 V DC dry-contact terminals for remote enable/disable. Analog 0–10 V or 4–20 mA setpoint input is available as a factory-configurable option.
What maintenance intervals are recommended for laboratory-grade operation?
Compressor oil and refrigerant filter-driers should be replaced every 24 months or 8,000 operating hours. Condenser coil cleaning is required quarterly in dusty environments; annual verification of refrigerant charge and PID tuning is advised for GLP-critical applications.
Does the unit comply with electromagnetic compatibility requirements for use near sensitive analytical instruments?
Yes—EMC testing per EN 61000-6-2 (immunity) and EN 61000-6-4 (emissions) confirms suitability for co-location with NMR spectrometers, mass spectrometers, and other low-noise measurement systems.