LAC PKRC55/11 Controlled-Atmosphere Box Furnace with Internal Gas Recirculation

Overview

The LAC PKRC55/11 is a precision-engineered controlled-atmosphere box furnace designed for reproducible thermal processing under inert, reducing, or reactive gas environments—including argon, nitrogen, hydrogen, forming gas (N₂/H₂), and chlorine-based atmospheres. Unlike standard muffle furnaces, the PKRC55/11 integrates an internal recirculation fan system that actively homogenizes both temperature and gas composition throughout the working chamber. This dual-control architecture—combining high-stability resistive heating with forced convection—ensures exceptional thermal uniformity (≤ ±10 °C across the load zone per DIN 17052-1) and minimizes surface oxidation, decarburization, or nitridation artifacts during heat treatment. The furnace is rated for continuous operation up to 1100 °C, enabled by a super-alloy (Inconel 600/625) hot-zone construction and optimized insulation design. Its modular vacuum-compatible configuration supports processes such as vacuum annealing, vacuum brazing, sintering of metal powders (e.g., stainless steel, tool steels), and controlled-atmosphere carburizing or chlorination—making it suitable for R&D labs, metallurgical QA/QC departments, and advanced materials development facilities operating under GLP or ISO 17025 frameworks.

Key Features

• Internally recirculated atmosphere via integrated high-temperature fan, ensuring rapid gas exchange and uniform thermal distribution
• Hot-zone constructed from Inconel 600/625 alloy, certified for sustained operation at 1100 °C with low thermal drift
• Dual-stage temperature control: primary K-type thermocouple (IEC 60584-2 Class 1) + independent overtemperature safety cut-off unit
• Gas handling system featuring auto-controlled inlet port (single-gas), manual vent valve, G1/2 water-cooling interface, and pressure relief valve (4–6 mbar setpoint)
• Robust mechanical design with side-hinged door, silicone gasket seal, and interlocked limit switch for operational safety compliance
• Standard HT205 programmable controller (30 programs × 15 steps, LAN interface) with real-time logging and remote monitoring capability
• Compliant with CE machinery directive (2006/42/EC), EMC directive (2014/30/EU), and RoHS II (2011/65/EU)

Sample Compatibility & Compliance

The PKRC55/11 accommodates cylindrical samples up to Ø272 mm × 410 mm in height, supporting crucibles, graphite fixtures, ceramic setters, and custom jigs for batch or single-part processing. It is routinely deployed in applications requiring strict adherence to ASTM E830 (standard practice for determining furnace temperature uniformity), ISO 9001 process validation, and USP method suitability for thermal sterilization or material stability testing. Optional calibration packages include traceable NIST-certified thermocouple verification and measurement loop adjustment per ISO/IEC 17025 requirements. For regulated environments, the furnace can be configured with audit-trail-enabled controllers (HT200 + HTMonit software) compliant with FDA 21 CFR Part 11 when paired with appropriate IT infrastructure.

Software & Data Management

The standard HT205 controller provides Ethernet-based communication (TCP/IP), enabling integration into lab-wide SCADA or MES platforms. Optional HT200 controller extends functionality with USB export, RS232/EIA-485 serial interfaces, and enhanced program depth (30 × 25 steps). HTMonit universal monitoring software delivers real-time temperature profiling, alarm event logging, trend analysis, and PDF report generation—including timestamps, operator ID, and deviation flags. All data files are stored in open CSV/XML formats for third-party statistical process control (SPC) tools. Firmware updates and configuration backups are performed remotely without hardware intervention, supporting continuous validation maintenance per GMP Annex 11 guidelines.

Applications

• Vacuum and protective-atmosphere annealing of stainless steels, nickel alloys, and titanium components
• Sintering of PM parts (e.g., MIM, HIP preforms) under nitrogen or dissociated ammonia
• Chlorination treatments for rare-earth magnet recycling or catalyst activation
• Heat treatment of electronic ceramics (Al₂O₃, SiC, ZrO₂) requiring oxygen partial pressure control
• Thermal aging studies for aerospace composites and nuclear-grade cladding materials
• Calibration reference furnaces for thermocouple verification labs (when equipped with multi-point mapping)

FAQ

Can the PKRC55/11 operate under vacuum without optional pump installation?

No—it includes a vacuum gauge and G1/2 port for pump connection, but vacuum capability requires external pumping and sealing upgrades.
Is the furnace compatible with hydrogen atmospheres?

Yes, provided proper ventilation, leak-tested gas lines, and explosion-proof instrumentation are implemented per IEC 60079-10-1.
What is the typical temperature recovery time after door opening?

Approximately 8–12 minutes to re-stabilize within ±2 °C at 900 °C, depending on load mass and ambient conditions.
Does LAC provide IQ/OQ documentation for GMP environments?

Yes—custom qualification protocols (including sensor mapping, alarm response tests, and software validation) are available upon request.
Can the recirculation fan speed be adjusted during a thermal cycle?

Fan operation is fixed-speed and interlocked with temperature; variable-speed control is not supported in standard configuration.