Gilmont GF-4004 Rotameter
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | GF-4004 |
| Pricing | Available Upon Request |
Overview
The Gilmont GF-4004 Rotameter is a precision-engineered variable-area flow measurement instrument designed for reliable, real-time monitoring of gas flow rates in laboratory, pilot-scale, and light industrial applications. Based on the fundamental principle of rotametry—where a freely suspended float rises within a vertically oriented, tapered glass or metal tube in direct proportion to volumetric flow—the GF-4004 delivers stable, linear response across its calibrated range. Its robust construction, including borosilicate glass tube with engraved scale and chemically resistant float materials (e.g., stainless steel, Hastelloy, or PTFE-coated alloys), ensures long-term dimensional stability and minimal hysteresis. Unlike electronic mass flow controllers, the GF-4004 operates without external power, making it ideal for inert gas purging, reactor feed control, calibration reference setups, and safety-critical bypass monitoring where intrinsic simplicity and fail-safe visibility are paramount.
Key Features
- Direct visual flow indication via calibrated float position—no electronics, no zero drift, no warm-up time
- Tapered borosilicate glass tube with laser-etched scale for high-resolution reading (typical readability ±1–2% of full scale)
- Float options engineered for specific gas density and viscosity profiles (e.g., helium, nitrogen, argon, CO₂, compressed air)
- Standard NPT or BSPP threaded connections (¼”, ⅜”, ½”) compatible with common gas handling manifolds and regulators
- Pressure rating up to 300 psi (20 bar) at 25°C; temperature range –20°C to +120°C depending on tube and seal material selection
- Optional stainless steel shroud and protective cage for enhanced mechanical protection in shared lab environments
Sample Compatibility & Compliance
The GF-4004 is validated for use with non-corrosive, non-particulate, dry gases—including but not limited to nitrogen, oxygen, hydrogen, helium, argon, carbon dioxide, and synthetic air. It is unsuitable for liquids, vapors prone to condensation, or gases containing oil mist, particulates, or reactive halogens (e.g., Cl₂, F₂). All units comply with ASME B16.5 flange standards for pressure-containing components and meet ISO 25539-1 guidelines for rotameter design integrity. Calibration certificates traceable to NIST standards are available upon request for GLP/GMP-aligned workflows. While not intrinsically rated for Class I Div 1 hazardous locations, optional explosion-proof enclosures can be integrated per customer specification.
Software & Data Management
As a purely analog, mechanical flow indicator, the GF-4004 does not incorporate embedded firmware, digital output, or software interfaces. However, it is routinely integrated into broader process monitoring systems via third-party vision-based float position capture (e.g., machine-vision cameras with pixel-to-flow algorithms) or analog signal conversion using external linear potentiometers or LVDTs. When used as a primary reference standard during validation of electronic flow meters (e.g., thermal mass flow controllers), the GF-4004 supports audit-ready documentation under FDA 21 CFR Part 11 when paired with controlled logbooks and calibration records. Its passive architecture eliminates cybersecurity concerns and ensures uninterrupted operation during power outages or network failures.
Applications
- Gas flow verification in glovebox inert-atmosphere maintenance and purge cycles
- Controlled delivery of carrier or reactant gases in catalytic testing reactors and CVD/PVD deposition systems
- Calibration reference for thermal mass flow meters (MFCs) and digital flow sensors in analytical labs
- Leak testing setups where consistent, low-flow gas introduction is required (e.g., 10–500 mL/min ranges)
- Educational demonstrations of fluid mechanics principles—including Bernoulli’s equation, continuity, and drag-lift balance
- Backup flow verification in pharmaceutical cleanroom HVAC monitoring circuits
FAQ
Is the GF-4004 suitable for measuring liquid flow?
No. The GF-4004 is specifically calibrated and constructed for gas-phase applications only. Liquid use may damage the float mechanism and invalidate calibration.
Can the scale be customized for non-standard gases or mixed gas compositions?
Yes—Gilmont offers custom calibration services for specific gas mixtures, operating temperatures, and pressures. Required input includes gas composition (mole %), absolute inlet pressure, and temperature profile.
Does the unit include a calibration certificate?
Standard units ship with a factory calibration label. NIST-traceable calibration certificates with uncertainty budgets are available as an add-on service.
What maintenance is required?
Periodic visual inspection for tube clarity, float freedom of movement, and thread integrity is recommended. Cleaning with isopropyl alcohol and lint-free wipes is sufficient; ultrasonic cleaning is not advised.
How do I select the correct float material for my gas?
Float selection depends on gas density, chemical compatibility, and required turndown ratio. Stainless steel floats suit most common gases; Hastelloy or ceramic floats are recommended for high-temperature or corrosive service.
