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Quick Answer: Yokogawa flow transmitters provide stable 4-20 mA HART signals for differential pressure, gauge pressure, and temperature loops. Emerson mass flow meters, including Coriolis models, read direct mass flow, density, and temperature for liquids, gases, and slurries. Silver Automation Instruments supplies replacement meters, new installs, and integration support for both measurement styles.
Yokogawa flow transmitter devices appear in many gas, oil, water, and steam plants. A common range is the EJA-E series. These units send a 4-20 mA HART signal to the DCS or PLC. Field engineers often pair a Yokogawa transmitter with an orifice plate, pitot tube, or averaging annubar. The transmitter reads differential pressure and calculates flow with a square root function. Some models also report static pressure and process temperature from the same housing. Temperature compensation uses a PT100 element inside the transmitter housing.
In practice, a water treatment site in Malaysia replaced older analog transmitters with Yokogawa EJA110E units last year. The team needed ATEX Zone 1 certification because the filter building handles methane gas. Each transmitter was ranged from 0 to 25 kPa differential pressure. Loop checks took less than two hours per point. That is the kind of detail plant engineers remember.
Yokogawa devices are not direct mass flow meters. They infer flow from differential pressure or another primary element. This works well for clean liquids, steam, and dry gas. For slurries, high viscosity fluids, or batch dosing, a direct mass meter often fits better.
Emerson mass flow meters, mainly Micro Motion Coriolis models, read mass flow, fluid density, and temperature in one pass. A food factory in Vietnam uses an Emerson CMF200 sensor for chocolate syrup batching. The meter reports kg/h and kg/m3. The flow range for that line runs 400 to 2,800 kg/h. The meter has a 4-20 mA HART output for mass flow and a second output for density. This setup cut batch variance by 0.6 percent because operators stopped using tank level as the only batch control signal.
Most engineers skip the marketing talk and check the basics. For an Emerson mass flow meter, the key items are wetted material, process connection size, flow range, and hazardous area classification. A standard Micro Motion sensor uses 316L stainless steel tubes. For corrosive fluids, specify Hastelloy C-22. If you need oil mass flow measurement in the Middle East, specify 316L tubes and ANSI 150 or 300 flanges. For seawater or desalination brine, a Super Duplex tube material is often required.
Because Emerson meters are direct mass measurement, they cover applications that volumetric meters cannot handle. A marine fuel transfer skid in Singapore needs a mass totalizer output. The Emerson unit reports kg or tonnes, not m3. That helps with bunker fuel custody transfer.
Plant managers compare these two brands because the measurement task is not always the same. A Yokogawa flow transmitter costs less for a simple steam line. It is lightweight, easy to mount, and spare boards are available in many countries. An Emerson mass flow meter has a higher purchase price but removes the need for a separate density meter and often improves batch accuracy.
We have seen this on customer sites many times. The first question is not which brand. The first question is what the control room needs. If the operator only needs a loop value for a water line, a Yokogawa transmitter with a flow element is enough. If the plant needs direct mass flow, density trend, and recipe control, an Emerson Coriolis meter is the better choice. A paint manufacturer in Colombia runs both. They use Yokogawa pressure transmitters for solvent tank level and Emerson Micro Motion meters for pigment dosing.
For premium plant management, flow meter data should go beyond a single loop value. Batch time, density trend, totalized mass, and alarm status all belong in the same historian. That is where transmitter selection and digital outputs become part of plant reliability.
Silver Automation Instruments is a flow meter manufacturer and supplier based in China. We serve industrial end users and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Our range covers Coriolis mass flow meters, electromagnetic flow meters, ultrasonic flow meters, vortex flow meters, oval gear flow meters, thermal mass flow meters, pressure transmitters, and paperless recorders.
For plants that currently use Yokogawa flow transmitters, we supply compatible differential pressure transmitters with 4-20 mA HART outputs. The accuracy is 0.075 percent of span for many models. Process connections include 1/2 NPT and M20 x 1.5 styles. We also provide flow elements and spare parts for test loops. If your site needs ATEX or IECEx certification, state the gas or dust zone and temperature class.
For plants that run Emerson mass flow meters, our Coriolis mass flow meters offer direct mass flow measurement for liquids and gases. The sensor sizes range from DN15 for pilot dosing lines to DN200 for bulk loading. We often supply units for palm oil, diesel, asphalt, chocolate, calcium chloride, and LNG test rigs. Accuracy is plus or minus 0.1 percent of rate for liquids under reference conditions. Use the digital display for totalized mass, density in kg/m3, and temperature in °C.
Here is the thing. Most quoting delays come from missing process data. Request a quote with your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h or m3/h. Also mention the fluid name, viscosity in cP if available, and hazardous area zone. We reply with a model recommendation and price within 24 hours. You can reach Silver Instruments on Tel +86-25-68650347, Whatsapp +86-25-52155837, WeChat +86 15365082610.
Can I replace a Yokogawa flow transmitter without changing the orifice plate? Yes. Many differential pressure transmitters work with existing orifice plates and impulse lines. Provide the existing range and process connection. We match the span and HART output. Recalibrate the square root function at the control system or in the transmitter.
What is the price difference between a Yokogawa flow transmitter and an Emerson mass flow meter? A differential pressure flow transmitter costs less for simple steam or water loops. An Emerson Coriolis meter costs more because it measures mass flow and density directly. A smaller Coriolis unit for a 15 mm line may cost more than a complete DP transmitter install. We quote both options based on your process data.
Do you supply Emerson mass flow meter compatible parts? We supply Coriolis mass flow meters that perform the same direct mass and density function. We do not claim to be an authorized Emerson distributor. For genuine Emerson parts, we can help source them through partner channels. For new projects, our Coriolis meters are often faster to deliver.
Which flow meter is best for a water treatment plant? For raw water, clean water, and chemical dosing, electromagnetic flow meters are common. Yokogawa transmitters suit flow loops that need differential pressure output. For polymer dosing, a Coriolis mass flow meter might be overkill unless mass balance is critical. Send us the fluid conductivity in µS/cm and pipe size. We will advise.
Can these meters send data to a PLC or DCS? Yes. Most units support 4-20 mA HART, pulse, RS485 Modbus, and some support FOUNDATION Fieldbus or Profibus. Give us your control system type and signal preference. We set the output range before shipment.
