ZHONGHUAN FURNACE Float-Type Gas Flow Control System
| Brand | ZHONGHUAN FURNACE |
|---|---|
| Origin | Tianjin, China |
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China) |
| Model | Float-Type Gas Flow Control System |
| Pricing | Available Upon Request |
Overview
The ZHONGHUAN FURNACE Float-Type Gas Flow Control System is an engineered solution for precise, stable, and safe delivery of process gases in controlled-atmosphere thermal processing environments. Designed primarily for integration with vacuum/atmosphere tube furnaces and box-type furnaces, this system combines traditional float-based visual flow indication with modern digital mass flow control architecture to deliver traceable, repeatable gas dosing under variable pressure and temperature conditions. Its operational principle relies on two complementary measurement modalities: a calibrated glass rotameter for real-time visual verification of volumetric flow rate (under defined reference conditions), and integrated thermal mass flow controllers (MFCs) for closed-loop, feedback-driven regulation based on standardized gas properties (e.g., N₂, Ar, O₂, H₂, forming gas). This dual-mode design ensures both operator transparency and metrological reliability—critical for GLP-compliant materials synthesis, sintering, annealing, and CVD precursor delivery applications.
Key Features
- Triple-interface compatibility: Equipped with standardized pneumatic connection options—Bartlett-style (barbed), double-ferrule compression, and KF-16/KF-25 vacuum flanges—enabling seamless integration with diverse furnace manifolds, vacuum lines, and gas purification modules.
- Dual-display monitoring: Analog glass rotameter provides immediate visual confirmation of flow range and direction; digital LED display (0.1–999.9 sccm or 0.1–10 L/min, depending on MFC calibration) delivers real-time mass flow readout with ±1% FS accuracy and <0.5% repeatability.
- Integrated safety architecture: Built-in check valves prevent backflow during pressure transients; stainless-steel mixing chamber ensures homogeneous gas blending prior to inlet into the furnace hot zone, eliminating localized concentration gradients and minimizing risk of unreacted gas accumulation.
- Modular scalability: Base configuration supports single-gas control; optional multi-channel expansion kits accommodate up to six independent gas lines with individual MFCs, pressure regulators, and solenoid isolation valves—all synchronized via shared RS485/Modbus RTU interface.
- Rugged industrial construction: All wetted parts fabricated from 316L stainless steel or borosilicate glass; leak-tightness verified to ≤1×10⁻⁹ mbar·L/s (He) per joint; operating pressure range: 0.1–1.0 MPa (gauge); ambient temperature tolerance: 5–40°C.
Sample Compatibility & Compliance
The system is validated for use with inert (Ar, N₂, He), reactive (O₂, H₂, NH₃), and mixed gases (e.g., 5% H₂/95% N₂, 4% H₂/96% Ar). All MFCs are factory-calibrated per ISO/IEC 17025-accredited procedures using NIST-traceable standards. The control architecture supports audit-ready data logging compliant with FDA 21 CFR Part 11 requirements when paired with optional software packages—enabling electronic signatures, user access levels, and immutable event history (including setpoint changes, alarm triggers, and valve actuation timestamps). Meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and low-voltage safety (EN 61010-1).
Software & Data Management
A Windows-based configuration utility enables remote setup of flow setpoints, ramp profiles, and alarm thresholds (e.g., low-flow, over-pressure, sensor fault). Raw analog outputs (0–5 V / 4–20 mA) and digital Modbus registers support integration into PLC-controlled furnace automation systems. Optional cloud-connected gateway modules provide secure TLS-encrypted telemetry to centralized lab informatics platforms, supporting automated report generation aligned with ISO 17025 documentation workflows.
Applications
- Controlled-atmosphere sintering of advanced ceramics and metal powders
- Oxidation/reduction annealing of semiconductor wafers and thin-film substrates
- Thermal treatment of battery electrode materials under inert or reducing atmospheres
- Gas-phase doping and surface functionalization in materials science research
- Process development for catalytic reaction studies requiring precise stoichiometric gas ratios
FAQ
Can this system be used with corrosive gases such as Cl₂ or HF?
Yes—upon specification of Hastelloy C-276 wetted components and fluoropolymer seals; custom configurations require pre-use compatibility review.
Is calibration certificate included with shipment?
Each MFC ships with a manufacturer’s calibration report; full ISO/IEC 17025-certified calibration is available as an optional add-on service.
What is the maximum allowable differential pressure across the MFC?
Standard units support up to 0.3 MPa ΔP; high-pressure variants rated to 1.0 MPa ΔP are available upon request.
Does the system support automatic purge cycles between gas switches?
Yes—programmable purge logic can be configured via the host software to sequence inert gas purging before and after reactive gas introduction.
Can I integrate this controller with third-party furnace controllers (e.g., Eurotherm, Watlow)?
Absolutely—the analog I/O and Modbus RTU interfaces are fully interoperable with industry-standard PID controllers and SCADA systems.
