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Capacitance Flow Meter: Non-Contacting Fluid Senses for Multiphase Pipelines
Quick Answer: Silver Automation Instruments supplies capacitance flow meters that measure multiphase pipelines without touching the fluid. These meters detect capacitance changes caused by the mixture and output 4-20 mA HART signals. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range for a quote.
Most flow meters fail when the fluid is not clean water. In practice, oil and gas producers run crude oil, water, gas, and sand in the same pipe. A capacitance flow meter measures that mixture by changes in dielectric properties. No moving parts sit in the flow. That means less wear, less fouling, and fewer shutdowns.
Why Non-Contact Sensing Matters on Multiphase Pipelines
Multiphase flow is hard to measure. The liquid and gas phases do not travel at the same speed. Solids can accumulate. A non-contact sensor avoids the erosion that destroys turbine blades and orifice plates. Silver Instruments builds capacitance flow meters with ceramic or PTFE liners and electrodes mounted outside the flow path. This design suits crude oil transfer, wet gas, and produced water lines.
We have seen this on customer sites many times. A paint manufacturer in Southeast Asia replaced a mechanical flow meter because solvent attacked the seals. The capacitance model worked for solvent and resin mixtures. Last year a customer in Vietnam asked us for a meter on a brine line. The non-contact sensor held up because nothing inside the pipe could corrode.
Technical Specs That Matter for Engineers
Engineers ask for real numbers. The SAI-CFM capacitance flow meter covers DN15 to DN300. Standard accuracy is 0.5% of reading for stable mixtures. The output is 4-20 mA HART with optional Modbus. Power supply is 24 V DC. Process temperature range is -20 °C to 120 °C. Pressure rating goes to 40 bar depending on the liner and flange rating.
For mass flow, pair the meter with a PT100 temperature sensor. The transmitter converts capacitance, temperature, and pressure signals into flow rate in kg/h or m³/h. The meter handles viscosity up to 500 cP for Newtonian fluids. Options include ATEX Zone 1 certification and IP67 housing. The electronics head is separate from the sensor, so you can mount it away from vibration.
Here is the thing. Capacitance flow meters work best when you know the dielectric constant of the main fluid. For multiphase flow, the reading shifts as the gas fraction changes. We can configure the transmitter with a field calibration that matches your actual mixture. Most engineers skip this part and wonder why the reading drifts. Do not skip field calibration on emulsions or slurries.
Where Capacitance Flow Meters Fit in Your Process
Use a capacitance flow meter for crude oil custody transfer, produced water reinjection, chemical batching, a
In the Middle East, we see these meters on wet gas and crude oil lines. In Latin America, mining sites use them for slurry water and tailings lines. In Southeast Asia, food producers use them for palm oil and sauces. The common requirement is a meter that does not clog and does not need frequent cleaning.
Installation and Maintenance Notes
Install the sensor in a straight run of 5 DN upstream and 3 DN downstream. Avoid air pockets. Mount the sensor in a vertical line if the gas fraction is high. The non-contact design does not need filter replacement. You still need to inspect the liner every 12 months on abrasive services. Clean the electronics housing with dry air.
The meter ships with a factory calibration certificate. We recommend a field verification on the actual multiphase mixture. A sample of your fluid helps our application team set the dielectric parameters.
FAQ
1. Can a capacitance flow meter measure gas and liquid at the same time?
Yes. The meter responds to the changing dielectric properties of the gas-liquid mixture. You need a field calibration for accurate flow rate. The output is not a single-phase gas flow reading unless you add a flow computer.
2. What is the smallest pipe size?
DN15. Silver Instruments supplies DN15 to DN300 as standard. Larger sizes are available on request.
3. Does this meter work in hazardous areas?
Yes. You can order ATEX Zone 1 certification for oil and gas installations. The 4-20 mA HART output connects to your existing safety barrier.
4. What is the difference between a capacitance flow meter and an electromagnetic flow meter?
An electromagnetic flow meter needs a conductive fluid, usually above 5 µS/cm. A capacitance flow meter can read non-conductive fluids such as fuels, solvents, and oils. That makes it a better fit for multiphase pipelines with mixed fluids.
5. How do I get a quote from Silver Automation Instruments?
Call us at +86-135-1213-1526. Use WhatsApp at 86-135-12131526. WeChat is +86 13512131526. Send your pressure in bar, temperature in °C, pipe size in DN, and flow range. Our engineers reply with model, price, and lead time.
Silver Automation Instruments supports flow meter selection for oil and gas, water and wastewater, chemical, food and beverage, and marine projects. We ship to Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Our technical team can help you choose between Coriolis, electromagnetic, ultrasonic, vortex, oval gear, thermal mass, and capacitance flow meters. For data sheets and specifications, see flow-meter.com.au.
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