Selection of Insertion Thermal Flow Meter for Moist Air

 Email: sales01@cxflowmeter.com

WhatsApp: 008618049841995

Selection Analysis and Recommendations for Customer's Insertion Thermal Flow Meter Needs

I. Analysis of Customer's Core Needs

Media Characteristics:Humid air, water content 36g/Nm³ (high humidity, potential condensation risk).

Media Temperature: 90℃, pressure 40mmwg (low-pressure operation, sensor temperature resistance must be considered).

Measurement Range:80,000-120,000 KG/h (high flow rate, requires high accuracy and wide range ratio equipment).

Installation and Maintenance: Insertion flange connection (DN1400 pipe, requires compatibility with large diameters).Online Cleaning (CIP) (equipment must have anti-clogging design and be easy to disassemble).

Functional Requirements: Temperature and pressure compensation (direct output of mass flow rate).

4-20mA output, on-site zero-point adjustment (remote calibration support required).

II. Technical Personnel Recommendation and Evaluation

Recommended Model: CX-VFM-GB-1400-G-4/R4-D-D-I

Parameter Comparison:

Parameter | Customer Needs | Recommended Model | Matching Analysis

Media | Humid Air (containing powder) | Gas (humidity limit not specified) | Sensor moisture resistance needs confirmation; dust may

 affect long-term stability, requiring regular cleaning.

Flow Rate Range | 80,000-120,000 KG/h | 30,000-300,000 KG/h | Covers requirements, but low-range redundancy is significant (may affect

 accuracy at low flow rates).

Temperature/Pressure | 90℃/40mmwg | -20℃~90℃/1.6MPa | Temperature matching; pressure is much higher than required

 (40mmwg≈0.004MPa), parameter redundancy exists.

Accuracy | Not specified (usually ≤1%) | 2.5% | Accuracy is low, may not meet high-accuracy requirements (e.g., energy metering).

Output and Adjustment: 4-20mA + On-site Zero Point Adjustment; 4-20mA + RS485 + LCD Display. Supports remote signal output, but 

zero point adjustment requires LCD or host computer (on-site operation convenience is generally limited).

Materials and Maintenance: Online CIP cleaning; Stainless steel + detachable measuring body. Meets corrosion resistance requirements,

 but frequent cleaning is necessary in dusty environments (recommended inspection every 3-6 months).

Potential Issues:

Insufficient Accuracy: 2.5% accuracy may not meet the needs of fine chemical or energy management scenarios.

Dust Impact: Although detachable for cleaning, frequent maintenance may increase downtime risk.

Parameter Redundancy: Pressure and flow rate limits are much higher than required, potentially increasing costs.

III. Alternative Solution Recommendation: Insertion Thermal Gas Flow Meter

Advantages:

Direct Mass Flow Measurement: No temperature or pressure compensation required, reducing error accumulation (especially suitable

 for humid gases).

High Accuracy and Stability: Typical accuracy ±1%, range ratio up to 100:1, more suitable for scenarios with large flow fluctuations.

Anti-clogging design: Optional self-cleaning sensor or backflushing device to reduce dust impact.

Fast response: The thermal principle is sensitive to flow rate changes, suitable for transient conditions.

Recommended model parameter example:

Parameters: Insertion thermal flow meter

Media: Moist air (water content ≤50g/Nm³)

Flow range: 50,000-150,000 KG/h (customizable)

Temperature/Pressure: -40℃~+350℃/≤4MPa (high pressure resistant)

Accuracy: ±0.5%~±1%

Output: 4-20mA+RS485+HART protocol

Maintenance: Online backflushing cleaning, IP67 protection

Material: 316L stainless steel (corrosion resistant)

Comparison conclusion:

Accuracy: Thermal flow meters (±1%) are superior to vortex flow meters (2.5%), making them more suitable for demanding applications.

Maintenance: Thermal flow meters support backflushing, while vortex flow meters require manual disassembly; the former has lower 

maintenance costs.

Cost: Initial investment for thermal flowmeters may be 10%-20% higher, but the long-term accuracy advantage offsets the difference.

If you have specific selection and pricing needs, please contact CIXIFM Winny:

 Email: sales01@cxflowmeter.com

WhatsApp: 008618049841995