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Volumetric flow meters report actual fluid volume as m3/h, L/min, or GPM. Silver Automation Instruments supplies rotor-based positive displacement meters, velocity and pressure based flow meters, and turbine flow meters for water, fuel, oil, chemicals, steam, and gas. Send your pipe size DN, flow range, fluid name, pressure bar, and temperature °C for a direct quote.
Contact Silver Automation Instruments: Tel +86-25-68650347, Whatsapp +86-25-52155837, WeChat +86 15365082610.
Positive displacement meters use rotating elements such as oval gears, nutating discs, or rotary vanes. Each rotation traps a known volume of liquid. The rotation count gives total flow and rate. These rotor-based fluid measuring tools handle viscous fluids from 2 cP to 1000 cP.
Common options include oval gear flow meters for diesel, fuel oil, palm oil, and light chemicals. We saw a paint manufacturer in Vietnam batch solvent on a DN25 line. Viscosity was around 80 cP. The oval gear meter sent a pulse output to a local totalizer. The plant closed a valve at the target volume. Accuracy stayed within plus or minus 0.5 percent of reading.
Choose an aluminum body for diesel and light oil. Choose stainless steel for food grade oil, solvents, or chemical service. If the liquid is non-conductive like paint or oil, a rotor-based meter often works better than an electromagnetic meter.
Turbine meters measure flow by reading rotor speed in a moving stream. The rotor sits in the flow path and spins at a rate proportional to velocity. These are rotor-based tools for clean, low viscosity liquids and gases.
Use a turbine flow meter for clean water, RO permeate, light fuels, LPG, or nitrogen. Dirt and solids can damage the rotor bearing. Most engineers skip turbine meters for raw wastewater or slurry. A magnetic flow meter is a better fit there.
Our liquid turbine meters cover DN10 to DN300. Outputs include 4-20 mA HART, pulse, and RS485 Modbus. Pressure ratings go up to 40 bar depending on body material. Gas service often needs temperature and pressure compensation because gas volume changes with operating conditions.
A water utility in Mexico installed DN150 turbine meters on three well water abstraction lines. The meters had local display and 4-20 mA HART output to SCADA. The site measured total extraction volume for government reporting.
Differential pressure flow meters calculate flow from the pressure drop across a primary element. Common elements include orifice plates, Venturi tubes, and cone meters. A DP transmitter measures the high and low sides. Flow rate is proportional to the square root of differential pressure.
These devices suit steam, natural gas, and high temperature liquid service. They have no moving parts in the flow stream. That is why they survive high temperature pipes where rotor bearings fail. We have supplied DP transmitters with orifice plates for steam lines at 250 °C and 16 bar.
One food processing plant in Thailand uses a DP flow meter on a hot water loop at 120 °C. The orifice plate is stainless steel. The transmitter has a local display and HART output. Installation cost was low because the orifice carrier fit between existing flanges.
For gas flow measurement, a DP meter needs pressure and temperature compensation. A flow computer or smart transmitter can do this task. Silver Automation Instruments also supplies pressure transmitters and temperature sensors for this purpose.
Start with the fluid. Is it water, fuel, oil, solvent, steam, or gas? Then check viscosity, conductivity, temperature, and solids content.
Pipeline size matters. Match the meter size to the pipe DN. Do not guess the flow range. Give the minimum, normal, and maximum flow. A meter sized only for maximum flow may lose accuracy at low flow.
Here is the thing. Viscosity changes Reynolds number and flow profile. A positive displacement meter is less sensitive to viscosity than a turbine meter. That is why diesel loading skids and lube oil blending systems often use oval gear meters.
Clean water with no particles suits a turbine meter because cost is low and installation is simple. Hot water or steam suits a DP flow meter with an orifice plate because there are no moving parts. Conductive water suits a magnetic flow meter because there is no pressure loss and solids do not stop it.
Send us your pressure in bar, temperature in °C, pipe size DN, fluid name, flow range, and required output. We will recommend one model and send a price quote within 24 hours.
A desalination plant in Saudi Arabia needed a seawater flow meter for a brine recirculation line. The pipe was DN80 and flow range was 5 to 50 m3/h. We supplied a magnetic flow meter with rubber liner and 4-20 mA HART. The design worked because the line had no moving parts to foul.
A palm oil producer in Malaysia uses oval gear flow meters for filling drums and intermediate bulk containers. Oil viscosity is around 60 cP at 50 °C. Each meter includes a pulse output and a batch controller. The system shuts a solenoid valve at the target volume.
A chemical distributor in Colombia handles solvents with low conductivity. They first tested a turbine meter but switched to an oval gear meter because viscosity changed between products. The positive displacement meter held accuracy better across the batch range.
Most plants ask for 4-20 mA with HART. The signal carries flow rate and allows remote configuration. A pulse output is useful for totalizing or batching. RS485 Modbus works when a PLC or flow computer needs digital data.
Hazardous areas often need ATEX Zone 1 or Zone 2 certification. Tell us the zone classification when you send the inquiry. We will confirm the certificate for the selected model.
What is the difference between a volumetric flow meter and a mass flow meter?
A volumetric meter reads m3/h or L/min. A mass flow meter reads kg/h or lb/min. If fluid density is stable, a volumetric meter is enough. If density changes with temperature or pressure, choose a Coriolis mass flow meter or compensate the volumetric signal.
Which volumetric flow meter is best for diesel?
An oval gear positive displacement meter works well for diesel and light fuel oil. It handles lubricity and gives high accuracy. Choose aluminum or stainless steel body based on the installation environment.
Can a turbine flow meter handle dirty water?
No. Particles can damage the rotor bearing and affect accuracy. Use an electromagnetic flow meter for dirty water, sludge, or raw wastewater.
What signal output should I request for a new flow meter?
4-20 mA HART is a common choice for process control. Add pulse if you need total flow for batching. Add RS485 Modbus if the plant uses digital communication.
How do I get a price from Silver Automation Instruments?
Send your pipe size DN, fluid name, flow range, temperature, pressure, and output signal. Contact us at Tel +86-25-68650347, Whatsapp +86-25-52155837, or WeChat +86 15365082610.
