LabTech H35 Compact Circulating Chiller

Overview

The LabTech H35 Compact Circulating Chiller is an integrated, water-cooled temperature control system engineered for precision thermal management of analytical instruments and laboratory processes requiring stable, continuous coolant delivery. It operates on a dual-technology thermal regulation platform combining digital PID feedback control with Hot Gas Bypass (HGB) refrigeration — a well-established method in high-performance chiller design across North America and Europe. Unlike conventional on/off compressor cycling, the HGB architecture maintains continuous compressor operation while modulating refrigerant flow via a bypass valve, thereby eliminating thermal shock, minimizing mechanical wear, and delivering superior temperature stability (±0.3 °C) over the full operating range of –5 to 35 °C. The unit integrates a compact plate-type heat exchanger for enhanced thermal transfer efficiency, rapid cooldown response, and minimized internal fluid volume — critical attributes for applications where thermal inertia must be reduced without compromising cooling capacity (350 W standard / 500 W optional). Its sealed, CFC-free R134a refrigerant circuit complies with international environmental directives including the Montreal Protocol and EU F-Gas Regulation (EU No. 517/2014).

Key Features

• Continuous-duty Hot Gas Bypass refrigeration system enabling uninterrupted compressor operation and extended service life
• Digital PID temperature controller with real-time LCD interface for precise setpoint adjustment and monitoring
• High-efficiency plate-type heat exchanger optimized for low-pressure drop and rapid thermal equilibration
• Integrated circulation pump delivering stable 3.5 L/min flow at 1.0 bar pressure — suitable for back-pressure-sensitive instrumentation
• Compact 1.8 L reservoir designed for minimal fluid inventory while maintaining thermal buffer capacity
• Energy-optimized drive electronics and insulated reservoir reduce power consumption during extended operation
• CE-marked per IEC 61010-1 (safety) and IEC 61000-6-3 (EMC); manufactured under ISO 9001-certified quality system

Sample Compatibility & Compliance

The H35 is compatible with a broad spectrum of laboratory equipment requiring external chilled water supply, including but not limited to ICP-OES and ICP-MS plasma torches, laser-based spectrometers (e.g., LIBS, Raman), X-ray diffractometers (XRD), NMR preamplifiers, and electrophoresis systems. Its stable output meets thermal load requirements for instruments demanding low-noise, vibration-isolated coolant flow. All wetted components are constructed from corrosion-resistant stainless steel and EPDM-sealed polymers to ensure compatibility with deionized water and common aqueous coolant mixtures (e.g., 20% ethylene glycol). The chiller supports GLP/GMP-aligned operational documentation through optional audit-trail-enabled firmware upgrades compliant with FDA 21 CFR Part 11 requirements for electronic records and signatures.

Software & Data Management

While the H35 operates as a standalone unit with front-panel LCD control, it supports analog (0–10 V / 4–20 mA) and digital (RS-485 Modbus RTU) interfaces for integration into centralized lab infrastructure. These ports enable remote setpoint adjustment, real-time temperature and status telemetry, and alarm logging within LIMS or SCADA environments. Optional LabTech ChillLink™ software (Windows-based) provides time-stamped data export (CSV), configurable alarm thresholds, and trend visualization for validation protocols. All configuration changes and temperature deviations are timestamped and retained in non-volatile memory for traceability — essential for ISO/IEC 17025-accredited laboratories performing instrument qualification (IQ/OQ/PQ).

Applications

• Thermal stabilization of inductively coupled plasma sources in elemental analysis workflows
• Cooling of high-power optical components in spectroscopic and imaging systems
• Temperature-controlled sample handling in automated liquid handlers and autosamplers
• Support of cryogenic pre-concentration modules in VOC and SVOC analysis systems
• Process cooling for small-scale chemical reactors and electrochemical cells
• Environmental simulation support in materials testing labs (e.g., ASTM D5276, ISO 22088-3)

FAQ

What is the advantage of Hot Gas Bypass over traditional on/off compressor control?

Hot Gas Bypass eliminates compressor cycling, reducing mechanical stress, electrical inrush current, and temperature overshoot — resulting in higher long-term reliability and tighter thermal stability.
Can the H35 be used with ethylene glycol–water mixtures?

Yes; the system is compatible with up to 30% v/v ethylene glycol solutions. Ensure pump seals and heat exchanger materials remain compatible with your selected coolant formulation.
Is remote monitoring supported out of the box?

Analog and RS-485 Modbus RTU interfaces are standard; no additional hardware is required for integration with building management or lab automation systems.
Does the unit comply with electromagnetic compatibility (EMC) regulations for use in analytical labs?

Yes — certified to IEC 61000-6-3 (industrial environment emissions) and IEC 61000-6-2 (immunity), ensuring coexistence with sensitive instrumentation without signal interference.
How is temperature calibration verified during installation?

The H35 includes a factory-calibrated PT100 sensor traceable to NIST standards. Optional on-site calibration verification kits and accredited third-party calibration services are available through LabTech’s global service network.