Why does entrained gas affect flow measurement?
In industrial processes such as petroleum, chemical, and food, liquids often entrain bubbles due to stirring, pumping, or chemical reactions. Bubbles can change fluid density and vibration characteristics, causing traditional Coriolis mass flowmeters to produce measurement errors or even stop working.
Therefore, choosing a flowmeter that can stably measure gas-containing liquids is crucial. Promass Q is a dedicated mass flowmeter designed for such operating conditions.
Core advantages of Promass Q
Promass Q adopts innovative multi-frequency vibration technology and intelligent signal processing algorithms to effectively overcome bubble interference. Its core advantages include:
- High gas void fraction adaptability: Can stably measure liquids with volume gas void fraction up to 20%.
- High accuracy: Maintains ±0.10% mass flow accuracy even under gas-containing conditions.
- Wide turndown ratio: Suitable for a wide range from micro flow to high flow.
- Maintenance-free: No wearing parts, good long-term stability.
Working principle: How does multi-frequency vibration overcome bubble interference?
Traditional Coriolis flowmeters experience unstable measuring tube vibration due to bubbles in gas-containing liquids. Promass Q simultaneously excites multiple vibration frequencies and uses intelligent algorithms to identify and compensate for bubble effects.
The specific steps are as follows:
- The measuring tube vibrates at multiple frequencies, acquiring response signals at different frequencies.
- The algorithm analyzes the signals to distinguish bubble interference from the true flow signal.
- Real-time compensation for density and phase errors caused by bubbles, outputting accurate mass flow and density values.
This process requires no external gas-liquid separation device, simplifying installation and reducing costs.
Technical parameter comparison
The following table compares the key performance of Promass Q and traditional Coriolis flowmeters in gas-containing liquid measurement:
| Parameter | Promass Q | Traditional Coriolis Flowmeter |
|---|---|---|
| Maximum gas void fraction | 20% | Usually <5% |
| Mass flow accuracy | ±0.10% | ±0.20% or worse |
| Density measurement | Supported, with compensation | Susceptible to bubbles |
| Installation requirements | No gas-liquid separation needed | Often requires upstream separation device |
Typical application scenarios
Promass Q is suitable for various gas-containing liquid measurement occasions, such as:
- Oil and gas: Water-cut crude oil, oil-gas mixed transportation measurement.
- Chemical: Raw materials or products entraining gas during reactions.
- Food and beverage: Carbonated beverages, gas-containing dairy products.
- Pharmaceutical: Fermentation broth, gas-containing medicinal liquids.
In these scenarios, Promass Q can provide reliable flow and density data, helping optimize processes and control quality.
Selection and installation recommendations
To ensure optimal performance, please note the following during selection and installation:
- Confirm the maximum gas void fraction of the process pipeline and select the appropriate caliber.
- Avoid installing the flowmeter near the pump outlet to reduce bubble accumulation.
- Ensure full-pipe measurement; vertical installation if necessary.
- Use the self-diagnosis function of Promass Q for regular verification.
Following the above recommendations can fully leverage the advantages of Promass Q in entrained gas liquid measurement.