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Electric Flow Meter: Automated Digital Signal Output Fluid Instruments
Quick Answer
Silver Automation Instruments supplies electric flow meters with automated digital signal output for liquids, gases and steam. These meters send pulse, 4-20 mA, RS485 Modbus or HART signals straight to a PLC, DCS or SCADA system. You can order our electromagnetic, vortex, turbine and Coriolis flow meters in sizes from DN15 to DN300 for water treatment, chemical dosing, fuel oil measurement and natural gas applications.
What Electric Flow Meters with Digital Output We Supply
We stock four main types of electric flow instruments with automated digital output. First is the electromagnetic flow meter, model SIL-MF200, which works for conductive liquids like wastewater, slurries and acids. It comes with a built-in pulse output, 4-20 mA and RS485 Modbus. Liner options include PTFE, hard rubber and PFA for chemical compatibility. Sizes range from DN15 up to DN300. Accuracy stays at ±0.5 percent of reading for flow velocities above 0.5 m/s. Second is the vortex flow meter, model SIL-VF100. This meter handles steam, compressed air and low-viscosity hydrocarbons. The digital output is a frequency pulse proportional to flow. You also get a 4-20 mA HART signal for temperature and pressure compensation in one unit. It covers DN15 to DN200 pipe sizes. Third is the turbine flow meter with a magnetic pickup. We offer the SIL-TF series for clean, low-viscosity fluids like diesel, jet fuel and light chemicals. The output is a square wave pulse, 10 pulses per litre or user-configurable. Last is the Coriolis mass flow meter, model SIL-CM300, which gives mass flow, density and temperature readings over RS485 or 4-20 mA. It shines in custody transfer, chemical batching and edible oil blending. Pipe size starts at DN3 for pilot plants and goes up to DN150 for bulk loading.
How the Digital Signal Output Works in the Field
Most engineers skip the theory and go straight to wiring. Here is the thing. The pulse output from an electric flow meter is a simple open-collector or dry contact signal. You connect it to a PLC high-speed counter input and multiply pulses by the meter K-factor. For example, one pulse equals 10 litres. A 4-20 mA output loops the flow rate into an analog input card. You scale 4 mA as zero flow and 20 mA as the max flow you set during commissioning. RS485 Modbus gives you direct digital values like instantaneous flow, totaliser and diagnostic status bits. No scaling needed. HART adds configuration on top of the 4-20 mA without extra wiring. In practice, water treatment plants in the Middle East often ask us to pre-configure the RS485 slave address and baud rate before shipping. They do not want to open the cover in a dusty panel room. We set address 1 and 9600 baud as a default and include a quick Modbus register map in the box.
Industry Applications and Real Examples
Water and wastewater is the biggest segment. A utility in Vietnam replaced old mechanical meters with our SIL-MF200 electromagnetic flow meters for raw water intake. They wired the 4-20 mA output to a local RTU and sent flow data to a central SCADA via GPRS. The maintenance crew now checks flow trends on a tablet without walking to the meter pit. Chemical plants use our vortex meters for solvent recovery lines. A paint manufacturer in Indonesia needed ATEX Zone 1 certification for a toluene transfer line. We supplied the SIL-VF100 with an intrinsically safe pulse output c
Installation and Commissioning Tips That Save You Time
Do not mount an electromagnetic flow meter directly after a butterfly valve. You need at least five straight pipe diameters upstream. Vortex meters dislike vibration. If your pipe shakes, use a flexible coupling or a heavier pipe support. Turbine meters must have a strainer upstream. We have seen many sites where a single weld bead destroys the rotor in two weeks. So install a 100-mesh Y-strainer and check it monthly. Coriolis meters work in any orientation, but if you measure gas, mount the sensor so the tubes drain condensate. All our meters ship with a factory calibration certificate traceable to national standards. You get the K-factor pulsing into your controller on day one. When you commission, feed a known flow and compare the total on the meter display with your PLC integrator. Adjust only if the offset exceeds the meter accuracy band.
Frequently Asked Questions
What is the standard digital output on your electric flow meters? Pulse, 4-20 mA and RS485 Modbus are standard on most models. HART is an option on vortex and Coriolis meters. You can request two outputs at the same time, for example pulse plus 4-20 mA.
Do you supply flow meters with automated batch control? Yes. Our SIL-CM300 Coriolis meter and SIL-MF200 electromagnetic meter can drive a remote batch controller or talk directly to a PLC. We pre-load the register map for Modbus TCP or RTU so your programmer can start fast.
Can I get a seawater flow meter with digital output for a desalination plant? Yes. We recommend the electromagnetic SIL-MF200 with PTFE liner and titanium electrodes for seawater and brine. The RS485 output sends flow and conductivity alarms to your control room.
What pipe sizes do you cover? DN15 to DN300 for electromagnetic and vortex meters. Turbine meters cover DN15 to DN200. Coriolis meters go from DN3 to DN150. For larger pipes, talk to us about insertion flow meters or custom solutions.
How fast can you ship an electric flow meter to Nigeria or Brazil? Most DN15 to DN100 models are in stock and ship within 3 business days via DHL or FedEx. Larger sizes and special liners take 2 to 3 weeks. We air freight to Lagos, Sao Paulo, Dubai and Jakarta every week.
Get a Quote with Your Exact Flow Parameters
Send us your fluid type, pipe size (DN), flow range in m³/h or L/h, pressure (bar), temperature (°C) and the output signal you need. Our engineers will reply within 24 hours with a recommended model and price. Contact Silver Instruments today.
Email: [email protected]
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
WeChat: +86 13512131526
Website: flow-meter.com.au
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