In chlorine production and chemical processing, precise chlorine gas flow measurement and control is essential for process stability, product quality, and plant safety. Chlorine (Cl₂) is a highly corrosive and toxic gas that requires specialized instrumentation to manage both accuracy and durability.
This case study highlights how the MTL20FD High Accuracy Mass Flow Controller was applied in a chlorine plant, providing accurate measurement in grams per hour (g/h) and enabling closed-loop control to optimize dosing and minimize risks.
Application :
Accurate measurement and control of chlorine gas flow in grams per hour (G/h) for industrial processes.
Exigences :
- High accuracy (±0.5% or as specified)
- Flow display in grams per hour (G/h)
Customer Challenges
The chlorine plant faced several operational challenges:
- Stable dosing required: Chlorine flow must be precisely controlled for chemical reactions to avoid overdosing or underdosing.
- Corrosion resistance: Standard flow meters failed quickly due to chlorine’s oxidizing nature.
- Process integration: The customer needed a device with 4–20 mA control signal for automatic regulation via DCS.
- Direct mass unit (g/h): Operators required g/h display for simplified process monitoring and reporting.
- Durability and safety: Equipment needed to perform reliably under 2–3 bar pressure without frequent maintenance.
Metlan’s Solution: MTL20FD High Accuracy Mass Flow Controller
Le MTL20FD was selected as it provides both measurement and active control of chlorine gas flow. Unlike conventional flow meters, this model integrates a control valve and supports closed-loop PID control, making it suitable for high-precision gas dosing.
Key Technical Configuration
- Medium: Chlorine gas (Cl₂)
- Flow rate: 200 g/h
- Précision : ±0,5%
- Display: Digital display, direct g/h readout
- Sensor: PTFE-type for chemical resistance
- Seal: FFKM (perfluoroether rubber) for long-term sealing in corrosive service
- Maximum Pressure: 3Mpa
- Connections: Ferrule type, ID 10 mm
- Control signal: 4–20 mA for DCS integration
- Power supply: 24 V DC
Benefits of Chlorine Flow Control with MTL20FD
- High accuracy measurement: ±0.5% precision ensures exact chlorine dosing, critical in chlor-alkali processes and disinfection.
- Active flow control: Integrated valve and PID algorithm allow the controller to automatically adjust flow, maintaining setpoints even under pressure fluctuations.
- Safety improvement: Stable control reduces chlorine leakage risks caused by overdosing, improving plant safety.
- Direct mass flow in g/h: Enables operators to directly monitor chlorine consumption and dosing in real units, avoiding conversion errors.
- Corrosion resistance: PTFE sensor and FFKM seals extend service life in chlorine gas service.
- System compatibility: Standard 4–20 mA I/O and ferrule fittings simplify installation and integration into the plant’s automation system.
Calibration and Shipping Assurance
Every MTL20FD is factory-calibrated before delivery. The chlorine gas controller undergoes:
- Calibration on precision gas standards to ensure ±0.5% accuracy,
- Leak testing with FFKM seals, ensuring reliable sealing under corrosive gas,
- Final inspection and packaging for safe shipment.
Below are the photos:
Conclusion :
Le MTL20FD High Accuracy Mass Flow Controller delivers precise measurement and control of chlorine gas (±0.5%), ensuring accurate dosing, reliable operation, and enhanced process safety.
Besoin d'aide pour la mesure du débit ?
If you’re facing challenges with unstable or inaccurate flow readings, contact Metlan Instruments today. Our team is ready to help you find the most reliable and cost-effective solution for your application.
