How Mass Flow Meter Works: Discharges precise mass metrics by evaluating Coriolis physical forces or internal energy transfer constants.

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How a Mass Flow Meter Works: Direct Mass Output from Coriolis Force or Thermal Constants

Quick Answer: A mass flow meter reports flow in kg/h, not volume. Coriolis meters measure mass directly by detecting a phase shift in vibrating tubes. Thermal mass flow meters measure heat removed by gas molecules passing a heated sensor. Both methods avoid separate pressure and temperature compensation used in volumetric meters.

Silver Instruments is a flow meter manufacturer and supplier for Coriolis and thermal mass flow meters. We serve oil and gas, water and wastewater, chemical, food and beverage, and marine systems. We ship to Southeast Asia, Oceania, Latin America, Africa, and the Middle East. The selection depends on fluid phase, pipe size, accuracy target, and installation conditions.

What a Mass Flow Meter Really Measures

Volume is a weak basis for process control. A cubic metre of gas at 1 bar is not the same amount of molecules as a cubic metre at 10 bar. Because density changes with pressure and temperature, gas measurement is the bigger win for mass flow meters. A mass meter reports kg/h or tonnes per hour. For liquids, this matters when density changes with product grade or process temperature. For gas, it matters even more.

Coriolis Mass Flow Meter: Direct Force Measurement

Here is the thing. A Coriolis meter does not need a lookup table for density compensation. It excites one or two tubes at a known frequency. Fluid enters the vibrating tube. Inlet and outlet sections move with a phase shift. That phase shift is proportional to mass flow. Separate sensor coils measure the time difference. The transmitter converts this to kg/h, density, and temperature. No moving parts are in the flow path except the tube itself.

In practice, a Coriolis meter works well for liquid fuels, edible oils, chemicals, slurries, and high pressure gases. We have seen this on customer sites many times. A paint manufacturer in Ho Chi Minh City upgraded from a turbine meter to a Silver Instruments Coriolis meter. The reason was batch repeatability. The batch mass error dropped from 1.8 percent to under 0.2 percent.

Typical turndown is better than 20 to 1. Accuracy can reach plus or minus 0.1 percent of rate for liquids. Some models handle gas flow down to 0.1 kg/h. Process connections range from DN15 to DN150. Wetted parts can be 316L stainless steel, Hastelloy C22, or PTFE lined. Options include ATEX Zone 1, 4-20 mA HART, Modbus, and pulse output.

Thermal Mass Flow Meter: Heat Transfer Constants

Most engineers skip this part because thermal mass flow meters are simpler mechanically. A thermal meter uses two PT100 sensors in the gas stream. One sensor is heated. The other measures the process gas temperature. Gas molecules carry heat away from the heated sensor. The cooling rate is related to mass velocity, not volume. The transmitter uses a built in heat transfer constant for that gas or gas mixture. For air, nitrogen, natural gas, or biogas, the meter gives direct standard volumetric or mass output.

This method is common for compressed air, flare gas, stack gas, and digester gas. It is not suitable for liquids or condensing vapours. Pipe size can be DN15 to DN300. Insertion styles cover large ducts. Accuracy is about plus or minus 1 percent of full scale and plus or minus 0.5 percent of rate. Response is fast and pressure drop is low.

Last year a customer in Vietnam asked us for a natural gas flow meter for a boiler feed line. The pipe was DN80, pressure 6 bar, fl

Key Selection Parameters for Industrial Buyers

Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h. That is the fastest way to get a workable model. We also need to know the fluid, viscosity in cP, conductivity in µS/cm if the fluid is water based, and the hazardous area classification if any. From there we can confirm whether a Coriolis or thermal mass meter fits.

Coriolis meters are more expensive at first. But they remove extra instruments. You do not need separate density, pressure, and temperature compensation when the meter is used for mass balance. Thermal mass meters are lower cost for gas lines. They are easy to install by hot tap or flange. The tradeoff is accuracy and liquid handling.

Model Selection for Common Processes

For diesel, fuel oil, palm oil, molasses, and liquid chemicals, choose a Silver Instruments Coriolis mass flow meter, model CMF-DN25 with 316L stainless steel tubes. Density output helps detect product changeover or water intrusion.

For natural gas, compressed air, nitrogen, and biogas, choose a Silver Instruments thermal mass flow meter, model TMF-DN50 inline with PT100 sensors. Insertion versions work for duct sizes above DN200. Specify whether you need standard cubic metres per hour or kg/h.

For high viscosity liquids above 500 cP, Coriolis is a better choice. For conductive water and wastewater, an electromagnetic flow meter may be cheaper. If the fluid is deionized water or a non-conductive solvent, Coriolis returns to the short list.

For a seawater desalination plant in Oman, a DN50 Coriolis meter on the brine line works well even with conductivity above 40,000 µS/cm. Mass output feeds the recovery ratio calculation without extra density instruments.

FAQ: Mass Flow Meter Operation and Sizing

Question: Does a Coriolis mass flow meter work with gas?

Answer: Yes. Coriolis meters handle gas, liquid, and some slurries. Gas density is lower, so the meter needs a smaller tube or higher excitation. We size it for the actual mass flow in kg/h.

Question: What is the main advantage over a volumetric flow meter?

Answer: A mass flow meter does not need separate pressure and temperature compensation for gas. You get kg/h directly. This reduces calculation errors and the number of field instruments.

Question: Can a thermal mass flow meter measure liquid?

Answer: No. Thermal mass meters are for gas. Liquid droplets or condensation can cause unstable readings. Use a Coriolis meter for liquid mass flow.

Question: What information should I send for a quote?

Answer: Send pressure in bar, temperature in °C, pipe size in DN, flow range in kg/h, and fluid name. Also note the hazardous area requirement, such as ATEX Zone 1 or Zone 2.

Question: Does Silver Instruments ship to my country?

Answer: Yes. We supply industrial buyers and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Contact Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610.

If you need a mass flow meter for a specific line, send us your pressure, temperature, pipe size, and flow range. We will reply with a model, price, and lead time from our factory. Our contact numbers are Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610.

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