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Quick Answer
A modern Coriolis meter gives you mass flow, density, temperature, and calculated volume from one sensor. You do not need a separate densitometer or flow computer. Silver Instruments multi‑variable transmitters cut field wiring and give you true mass measurement even when gas bubbles or viscosity swings appear in the line.
What Multi‑Variable Mass Processing Does on a Real Site
Basic flow meters give you a single 4‑20 mA signal. A Coriolis meter from Silver Instruments reads mass flow in kg/h, fluid density in kg/m3, and process temperature via a built‑in PT100. The onboard electronics then calculate net volume, percent solids, or °Brix. All values leave the transmitter at the same time. No external calculator is needed.
A desalination plant in the Philippines used to run a mechanical totalizer plus an insertion densitometer on the brine line. We swapped both for one DN25 Coriolis meter. Mass flow went to the PLC on HART channel 1, density on channel 2. The plant dropped two leak paths and now does a single‑point verification once a week instead of daily multipoint checks.
Density and Concentration Measurement Inside the Same Body
Many food and chemical plants want mass flow but also need Brix, Baume, or API gravity. A Silver Instruments meter runs concentration tables internally. In Thailand, a glucose syrup producer uses a DN15 unit to output mass flow on the first analog output and °Brix on the second. The density loop closed their final evaporator control without an extra in‑line refractometer.
Temperature compensation runs automatically. The meter samples density 2,000 times per second. You get a smoothed density reading with an accuracy of ±0.5 kg/m3 even during hot CIP cycles. That data arrives on the same twisted pair that carries mass flow. One cable, four process variables.
Volume Flow That Is Not Guessed
Because the meter knows real‑time density, it divides mass by density and delivers a live volumetric flow. This matters a lot with viscous oils and non‑Newtonian fluids. A lubricant filling line in Indonesia used to suffer offset drift on a turbine meter. After they installed a DN10 Coriolis, the fill volume stayed within 0.15% of setpoint. Output was mass flow on pulse, volume on 4‑20 mA. Fill speed is 0 to 50 kg/h with a density around 880 kg/m3 at 40 °C.
Two‑Phase Handling and Diagnostics
Most process pipelines contain a little gas. The Coriolis transmitter detects gas slugs via drive gain and damping variation. Instead of freezing the output, a multi‑variable unit holds density at the last good value and flags a warning on Modbus. A crude oil lease automatic custody transfer skid in Mexico uses this feature.
Drive gain and pick‑off voltage are also available as secondary variables. A maintenance team can trend them over time to spot coating build‑up or erosion long before a process upset.
Outputs That Match Your DCS Needs
A standard Silver Instruments Coriolis transmitter offers two 4‑20 mA HART channels, a pulse/frequency output, and RS485 Modbus. You can assign mass flow, volume flow, density, and temperature to any channel. Local display shows all four values and totalizer on one screen. This replaced three discrete devices for a paint maker in Vietnam: mass flow meter, RTD, and density converter. Wiring went from twelve conductors to four.
Wetted parts come in 316L or Hastelloy C‑22. Process connections from DN10 up to DN150 cover flows from 0.5 kg/h to 720,000 kg/h. Maximum pressure rating is 100 bar, and the standard temperature limit is 150 °C with remote mount options for 200 °C.
Frequently Asked Questions
Q: Can a Coriolis meter truly replace a separate density meter?
A: Yes. The same tube vibration gives density at ±0.5 kg/m3 repeatable enough for blending, quality check, and interface detection. Many sites delete the in‑line densitometer after one trial month.
Q: What fluid viscosities can the meter handle?
A: From 0.3 cP solvents to 3,000 cP heavy oils. Pressure drop stays low because the tube geometry is straight and short. We have tested peanut butter and cold molasses on DN25 meters without losing oscillation.
Q: Do I need a separate PLC calculation block for temperature compensation?
A: No. The meter uses its built‑in PT100 and firmware density model. Temperature correction is continuous and automatic. You just pull the corrected mass flow over HART or Modbus.
Q: How do I get a quotation that matches my pipe and fluid?
A: Send us your pipe diameter (DN), minimum and maximum flow rate (kg/h or L/min), process temperature, and pressure. Also mention fluid type and conductivity if known. We will return a datasheet and price in one working day.
Q: Is the meter safe for gas zones?
A: Silver Instruments supply ATEX and IECEx models for Zone 1 and Zone 2 gas atmospheres. Flameproof or intrinsically safe versions are available with Ex d and Ex ia protection.
To request a specific proposal, send your pressure (bar), temperature (°C), pipe size (DN), and flow range. Reach us directly: Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, WeChat: +86 13512131526. Talk to an engineer about your multi‑variable measurement this week.
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