Buffer Flowmeter Selection

Email: sales01@cxflowmeter.com

WhatsApp: 008618049841995

Buffer Flowmeter Selection

The customer provided the following information for use in an ultrafiltration system.

Media: Material/Buffer (No Particle Crystallization, No Corrosion)

Viscosity: 10 cp

Normal Temperature and Pressure

Actual Liquid Mass Flowmeter Operating Range: Approximately 42-72 L/h

Material: 316L

Polishing: Conventional Polishing

For flowmeter selection for materials/buffers in ultrafiltration systems (no particle crystallization, no corrosion, viscosity: 10 cp, normal 

temperature and pressure, flow rate: 42-72 L/h), a DN10 electromagnetic flow meter is recommended as the preferred option. A high-precision

 vortex flowmeter can be an economical alternative. A detailed analysis is as follows:

I. Core Parameter Compatibility Analysis

Flow Range and Turndown Ratio

DN10 electromagnetic flowmeter: The range can be set from 10-100 L/h. The actual operating flow rate (42-72 L/h) covers 42%-72% of the

 range, meeting the selection principle of "common operating conditions fall within the 30%-70% range," thus avoiding the loss of accuracy

 caused by "overwhelmingly large forces." High-precision vortex flowmeter: With a 10:1 turndown ratio, it covers a range of 5-80 L/h. However,

 accuracy requires a flow rate of at least 0.5 m/s. Verify that the actual operating flow rate meets the required flow rate.

Flow Rate Comparability

DN10 electromagnetic flow meter: Flow rates of 0.15-0.25 m/s are achieved at flow rates of 42-72 L/h, close to the minimum recommended

 flow rate of 0.3 m/s. Optimized installation (such as vertical mounting) can reduce low-flow noise interference.

Vortex flowmeter: Requires a flow rate of ≥ 0.5 m/s. Insufficient actual flow rates may cause signal fluctuations. Increasing the flow rate by 

reducing the diameter or adjusting the mounting method is recommended.

Material and Process Compatibility

Lining Material: PTFE (suitable for non-corrosive media, compatible with buffer solutions).

Electrode/Housing Material: 316L (conventionally polished to meet sanitary requirements, consistent with the pipe material).

II. Recommended Models and Parameter Comparison

Parameters: DN10 Electromagnetic Flowmeter, High-Precision Vortex Flowmeter

Flow Range: 10-100 L/h, 5-80 L/h

Flow Velocity Range: 0.15-0.25 m/s, 0.5-8 m/s

Accuracy: ±0.5% ±1.0%

Cost: Medium, Low

Application: Low-Flow Optimization, Economical Alternative

III. Selection Criteria

Preferably choose a DN10 electromagnetic flowmeter.

Advantages:

Significantly improved range and flow rate compatibility, with measurement accuracy stable at ±0.5%.

Viscosity resistance (no effect at 10 cp) and impurity resistance (no particle crystallization) meet ultrafiltration system requirements.

316L material and sanitary-grade polishing meet system requirements.

Case Study: A municipal sewage treatment plant uses a DN10 electromagnetic flowmeter to monitor the influent flow of its ultrafiltration 

system. Long-term operation shows a measurement error of <±0.3%, with minimal maintenance. Alternative High-Precision Vortex Flowmeter

Applicable Conditions: Budget-sensitive and acceptable ±1.0% accuracy.

Advantages:

Cost 20%-30% lower than electromagnetic flowmeters.

10:1 rangeability, covering 42-72 L/h operating conditions.

Limitations: Verify that the medium is completely bubble-free (vortex flowmeters are sensitive to bubbles), and the actual flow velocity 

must be ≥ 0.5 m/s.

IV. Implementation Recommendations

Supplier Confirmation

Contact suppliers (such as E+H, KROHNE, and VTON) to confirm DN10 electromagnetic flowmeter delivery times and PTFE lining options.

Sanitary certifications (such as 3A, EHEDG) and IP65 protection rating certification are required.

Installation and Commissioning

Straight Pipe Length Requirements: Ensure the straight pipe length is ≥ 5 DN (50 cm for DN10). Avoid installation near pump outlets or 

downstream of valves.

Installation Orientation: Install vertically (flow from bottom to top) to prevent bubble accumulation. For horizontal installation, ensure the 

electrode axis is horizontal. Grounding and Shielding: Ensure a good single-point grounding and standardized shielding to reduce 

electromagnetic interference.

Testing and Verification

During on-site testing, compare the actual flow rate with the displayed value to confirm that the range is fully covered without any dead 

zones.

If using a vortex flowmeter, perform a bubble interference test (e.g., by passing air through the flowmeter to observe signal stability).

If you have any questions about flowmeter selection or pricing, please contact CIXIFM Winny:

Email: sales01@cxflowmeter.com

WhatsApp: 008618049841995