Tongzhou Weipu C2 Circulating Chiller for Kjeldahl Nitrogen Analyzers

Overview

The Tongzhou Weipu C2 Circulating Chiller is an integrated, water-cooled refrigeration system engineered specifically to provide stable, continuous cooling for heat-sensitive analytical instruments in regulated laboratory environments. Designed to meet the thermal management requirements of Kjeldahl nitrogen analyzers—where consistent condenser temperature directly impacts distillation efficiency, ammonia recovery accuracy, and method reproducibility—the C2 operates on a phase-change refrigeration cycle, delivering precise temperature control across its full 5–35 °C operating range. Its compact, self-contained architecture eliminates the need for external cooling towers or facility chilled-water loops, making it suitable for installation in space-constrained instrument rooms or mobile laboratories. The chiller maintains thermal equilibrium under variable load conditions typical during extended digestion and distillation cycles, ensuring uninterrupted operation of connected instrumentation without thermal drift.

Key Features

• Integrated design with built-in refrigeration circuit, pump, reservoir, and PID-controlled thermostat—no external components required.
• Phase-change refrigeration system optimized for low-noise, high-efficiency operation at steady-state loads typical of Kjeldahl digestion modules and condensers.
• Precision temperature regulation with ±0.1 °C stability over the full 5–35 °C range, verified per ISO/IEC 17025 calibration protocols.
• 20-liter stainless-steel reservoir with level sensor, corrosion-resistant internal plumbing, and anti-algal biocide compatibility.
• Programmable ramp-and-soak profiles accessible via front-panel interface; optional RS485 Modbus RTU output for integration into centralized lab monitoring systems.
• Over-temperature, low-flow, and dry-run protection circuits compliant with IEC 61000-6-2 electromagnetic compatibility standards.

Sample Compatibility & Compliance

The C2 chiller is validated for use with Kjeldahl nitrogen analyzers (including models from FOSS, Buchi, Gerhardt, and UDK series), as well as other thermally demanding instrumentation such as atomic absorption spectrometers (AAS), inductively coupled plasma optical emission spectrometers (ICP-OES), scanning electron microscopes (SEM), and plasma etching systems. Its cooling performance aligns with ASTM D1193 Type II water specifications when used with deionized water or inhibited glycol-water mixtures. The unit supports GLP/GMP workflows through traceable temperature logging (when paired with optional data logger) and meets mechanical safety requirements per EN 61010-1:2010 for laboratory electrical equipment.

Software & Data Management

While the C2 operates as a standalone instrument with local digital display and manual setpoint adjustment, it supports external data acquisition via its standard RS485 serial interface (Modbus RTU protocol). Integration with LIMS or SCADA platforms enables remote monitoring of reservoir temperature, outlet pressure, and runtime hours. Audit-trail-capable software packages—including third-party tools compliant with FDA 21 CFR Part 11—can be configured to record temperature deviations, alarm events, and maintenance intervals, fulfilling documentation requirements for accredited testing laboratories.

Applications

• Continuous condenser cooling during Kjeldahl digestion and steam distillation, minimizing ammonia volatilization losses and improving nitrogen recovery precision.
• Thermal stabilization of graphite furnace AAS autosamplers and ICP torch interfaces to reduce spectral noise and enhance detection limits.
• Cooling of SEM cold stages and cryo-transfer systems requiring stable sub-ambient temperatures without liquid nitrogen dependency.
• Heat dissipation management for RF generators in plasma etchers and vacuum arc furnaces operating under high-duty-cycle conditions.
• Support of glovebox inert-atmosphere integrity by maintaining stable purge gas dew point through chiller-coupled dry air systems.

FAQ

What is the recommended coolant for the C2 chiller?**
Deionized water is preferred for optimal heat transfer and corrosion prevention; 20–30% inhibited propylene glycol solutions may be used where freeze protection is required.
Can the C2 be used with non-Kjeldahl instruments?**
Yes—it is compatible with any laboratory device requiring recirculated cooling within its 5–35 °C range and ≤1600 W thermal load, including ICP-OES, SEM, and plasma etchers.
Does the C2 support validation documentation for ISO 17025 accreditation?**
Factory calibration certificates and traceable temperature verification reports are available upon request; users may perform IQ/OQ using standardized PT100 probes and NIST-traceable reference thermometers.
Is remote monitoring capability built-in or optional?**
RS485 Modbus RTU communication is standard; Ethernet or Wi-Fi connectivity requires external gateway hardware and is not natively embedded.
What maintenance intervals are recommended?**
Reservoir cleaning and filter inspection every 6 months; refrigerant charge and compressor performance verification annually or after 5,000 operational hours—whichever occurs first.