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Moist Air Insertion Thermal Flow Meter
I. Customer Needs and Technical Solution Matching Analysis
1. Core Needs Review
Requirement Item: Customer's explicit requirements
Media: Moist air (containing 36g/Nm³ of water), with trace dust
Operating Parameters: Temperature 90℃, Pressure 40mmwg (approximately 0.004MPa), Flow range 80,000-120,000 KG/h
Installation and Maintenance: Insertion flange connection (DN1400 pipeline), supports online CIP cleaning, detachable measuring body
Functional Requirements: Temperature and pressure compensated output mass flow rate, 4-20mA signal, on-site zero-point adjustment
2. Technical Personnel Recommended Solution (Vortex Flow Meter)
Recommended Model: CX-VFM-GB-1400-G-4/R4-D-D-I
II. Adaptability Analysis of Insertion Thermal Gas Flow Meter
1. Technical Advantages of Thermal Flow Meter
Direct Mass Flow Measurement: No external temperature and pressure compensation required; directly outputs mass flow rate through thermal diffusion principle, reducing error propagation.
High accuracy and wide range: Typical accuracy ±1%, range ratio up to 100:1, suitable for scenarios with large flow fluctuations.
Moisture and dust resistant design: The moisture-proof sensor can withstand humid gases with a moisture content of 50g/Nm³ or higher.
Optional self-cleaning function (such as a backflushing device) or wear-resistant coating to reduce the impact of dust.
Fast response and stability: Sensitive to flow rate changes, suitable for transient conditions, and offers superior long-term stability compared to vortex shear systems.
2. Customized Solutions for Customer Needs
Recommended Model Parameters:
Parameters: Optimized Solution for Insertion Thermal Flow Meter
Media Compatibility: Humid air (water content ≤50g/Nm³), dust-resistant coating sensor
Flow Range: 50,000-150,000 KG/h (customizable range)
Temperature/Pressure: -40℃~+350℃/≤4MPa (covering 90℃/0.004MPa operating conditions)
Accuracy and Output: ±0.5%~±1% accuracy, 4-20mA+HART protocol (supports remote zero-point calibration)
Maintenance Functions: Online backflushing cleaning, IP67 protection rating, quick-disassembly structure
Materials and Certifications: 316L stainless steel (corrosion resistant), compliant with ISO 9001 quality system
Key Improvements:
Accuracy Improvement: Optimized from 2.5% to ±1%, meeting the needs of fine chemicals or energy management.
Simplified Maintenance: Backflushing device reduces the frequency of manual disassembly, and CIP compatibility is enhanced.
Data Reliability: HART protocol supports remote diagnostics, reducing on-site operational risks. III. Risk Warning and Countermeasures
1. Potential Risks
Dust Blockage: Trace amounts of dust may accumulate on the sensor surface, affecting measurement accuracy over time.
Humid Gas Condensation: High-temperature, humid air may condense on low-temperature components (such as sensor probes), leading to short circuits or corrosion.
Installation Flow Field Interference: For DN1400 large-diameter pipes, ensure insertion depth and flow field uniformity to avoid eddy current errors.
2. Countermeasures
Dust Management: Regularly (every 3-6 months) activate the backflushing device to remove dust.
Select sensors with anti-adhesion coatings (such as PTFE).
Anti-Condensation Design: Install a constant-temperature heating device on the sensor probe to prevent condensation.
Select IP67 protection rating to prevent moisture intrusion into electronic components.
Installation Optimization: Recommended insertion depth is 1/3 of the pipe diameter (approximately 460mm), ensuring the measurement point is located in the mainstream area.
Upstream and Downstream Straight Pipe Section Requirements: Upstream ≥ 5D, Downstream ≥ 3D (D is the pipe diameter).
IV. Final Recommendations and Action Steps
Preferred Recommendation: Insertion-type thermal gas flow meter. Provide a report of measured data under humid gas conditions (e.g., accuracy curve for a water content of 36 g/Nm³).
Demonstrate the backflushing cleaning function and confirm CIP system compatibility.
If the customer insists on a vortex flow meter solution, the following measures are required:
Add an external temperature and pressure compensation module and clarify the accuracy of the compensation algorithm (recommended ≤0.5%).
Sign a regular maintenance contract, disassembling, cleaning, and calibrating the sensor quarterly.
Contact: CIXIFM Winny
Email: sales01@cxflowmeter.com
WhatsApp: +0086 180 4984 1995
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