Flow meter Selection for C4Cl2F6 (Liquid)

Flowmeter Selection for Dichlorohexafluorocyclobutane (Liquid)
 

 

For the selection of a flowmeter for dichlorohexafluorocyclobutane (liquid), considering its requirements for small flow rates, high accuracy, special sealing properties,
and chemical compatibility, a Coriolis mass flowmeter(small-diameter model) is recommended. The specific analysis is as follows:

 

I. Core Selection Basis

* **Media Characteristics:** Dichlorohexafluorocyclobutane is a fluoride liquid with strong chemical inertness, requiring the selection of materials with excellent
corrosion resistance (such as Hastelloy or 316L stainless steel).

 

It has a high density (1.6 g/cm³) and a very small flow range (0-100 g/h or 0-1000 g/h), requiring high-precision measurement.

 

* **Technical Requirements:**

* **Accuracy Requirement:** 1.5% of full scale; flowmeter types affected by fluid density and viscosity must be excluded.

* **Sealing Performance:** Helium leakage rate ≤1×10⁻⁹ mbar·l/s; a fully welded structure or FFKM seal is required.

 

 

Signal Output: 4-20 mA standard signal, facilitating integration into control systems.

 

Operating Temperature: +25°C (normal temperature), no special temperature compensation required.

 

Reasons for Excluding Differential Pressure Flow Meters: Differential pressure flow meters require throttling devices, which may cause fluid expansion or
vaporization, leading to measurement errors.

 

The trace flow rate of dichlorohexafluorocyclobutane (especially 0-100 g/h) is difficult to achieve with high accuracy using differential pressure flow meters,
and requires long straight pipe sections, limiting installation space.

 

 

II. Recommended Solution: Coriolis Mass Flow Meter

 

1. Model Selection: Small-diameter Coriolis flow meters (e.g., DN4-DN15): Directly measures mass flow rate, unaffected by density and viscosity,
with an accuracy of ±0.1%-±0.5%, meeting the 1.5% requirement.

 

Suitable for trace flow rates (0-100 g/h and 0-1000 g/h), with a wide range ratio (typically above 10:1).

 

Fully welded structure, optional FFKM seal, meeting helium leakage rate requirements.

 

The housing is made of AISI 316, compatible with fluoride media.

 

 

2. Key Parameter Matching

 

Requirement Item: Coriolis Flow Meter Characteristics; Matching

 

Flow Range: 0-100 g/h and 0-1000 g/h; Range coverage, small-diameter models support micro-volume flow.

 

Accuracy: ±0.1%-±0.5%; Better than the required 1.5%

 

Sealing: FFKM seal, fully welded structure; Helium leakage rate ≤1×10⁻⁹ mbar·l/s

 

Material: Measuring tube: Hastelloy/316L; Housing: AISI 316; Fluoride corrosion resistant.

 

Signal Output: 4-20 mA; Standard signal, compatible with control systems.

 

Operating Temperature: -50°C to +200°C (standard models); Covers +25°C requirements.

 

 

3. Advantages Summary

 

High Accuracy: Directly measures mass flow rate, avoiding density and temperature compensation errors.

 

Stability: No moving mechanical parts, minimal drift during long-term operation.

 

Easy Installation: No straight pipe section required, small space occupation, suitable for laboratory or compact environments.

 

Low Maintenance Costs: No risk of clogging, easy cleaning (especially necessary for scenarios containing particles, requiring pre-filtration).
 

 

III. Alternative Solutions (If Budget is Limited)

 

If Coriolis flow meters are too expensive, consider high-precision turbine flow meters (media compatibility needs verification):

 

Applicable Scenarios: High fluid cleanliness, no particles, and low viscosity (viscosity of dichlorohexafluorocyclobutane needs confirmation).

 

Limitations: Accuracy is affected by density, requiring regular calibration; reduced diameter installation may be necessary for low-flow-rate applications.
 

 

IV. Implementation Recommendations

Confirm Media Viscosity: If viscosity > 10 cSt, prioritize Coriolis flow meters; if viscosity is low and budget is limited, evaluate turbine flow meters.

 

Pre-filtration: If the media contains small particles, a filter (pore size ≤ 10 μm) must be installed before the flow meter.

 

Conclusion: Coriolis mass flow meters are the optimal choice for measuring low-flow-rate dichlorohexafluorocyclobutane, balancing
accuracy, stability, and chemical compatibility, meeting all technical requirements.

 

If you have specific needs for selecting and quoting industrial flow meters, chemical flow meters, or precision flow meters,
please feel free to contact CIXIFM winny: