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Yokogawa Coriolis Flow Meter Rotamass Series Mass Processing Sizing Specs
Quick Answer
Yokogawa Rotamass Coriolis meters cover DN15 through DN200 in most process plants. Liquid mass flow accuracy reaches 0.1 percent of rate on Total Insight sensors and 0.5 percent of rate on gas applications. For a stable measurement, size the sensor so the normal mass flow sits between 30 and 70 percent of the meter full scale instead of matching the pipe diameter only.
Rotamass Series Lineup and Nominal Sizes
The Rotamass family includes the Nano, Total Insight, Giga, and Prime sensors. Nano targets very low flows such as additive dosing and pilot plant batches. Total Insight is the standard choice for reactor feed, custody transfer, and loading skids. Giga handles high flow and high pressure duties. Prime is built for hygienic processes in food, dairy, and pharmaceutical plants.
Common line sizes are DN15, DN25, DN40, DN50, DN80, DN100, DN150, and DN200. Some projects go beyond DN200 but these eight sizes cover most chemical, oil and gas, water treatment, and food sector inquiries that we receive from buyers in Southeast Asia, the Middle East, and Latin America.
Do not size a Coriolis meter by line size alone. A DN50 Rotamass Giga sensor can process a higher mass flow than a DN50 Nano because the tube geometry, wall thickness, and full scale range are different. The load point in kg/h or tonnes per hour is the real sizing variable.
Mass Flow Accuracy and Zero Stability
Liquid mass flow accuracy on Rotamass Total Insight can reach 0.1 percent of rate. Gas accuracy is usually 0.5 percent of rate. Zero stability is a separate specification. If your batch operation runs below 10 percent of full scale for long periods, the zero stability value matters more than the base accuracy statement.
Most engineers skip this part on the first pass. In practice, a meter sized at 40 to 60 percent of its maximum mass flow gives a good balance between accuracy, pressure drop, and future capacity. Oversizing a Coriolis meter is worse than oversizing a magnetic flow meter because low mass flow reduces the signal quality. We have seen this on customer sites in Thailand and Colombia where a DN80 was installed for a flow that a DN40 would have measured much better.
Density and Temperature Handling
Rotamass sensors measure density at the same time as mass flow. Density accuracy can reach 0.0005 g/cm3 on some Total Insight and Prime versions. This output helps concentration control, interface detection, and quality checks on syrups, solvents, and slurries. Process temperature ratings vary by sensor family. Standard Total Insight sensors often handle minus 40 to plus 150 degrees Celsius. High temperature versions can reach 350 degrees Celsius. Check the exact model code because the sensor body and electronics have different ambient limits.
For food and beverage plants, a Rotamass Prime with hygienic surface finish and EHEDG certification is often required. For a paint manufacturer in Malaysia running solvent based resins, the density output changes with temperature so you need a compensation table in the PLC or in the transmitter. A dairy plant in New Zealand may use Prime sensors on raw milk intake lines where CIP temperature swings are part of the daily routine.
Pressure Ratings and Wetted Materials
Pressure ratings depend on the sensor size, flange standard, and operating temperature. Common flange classes include PN40, PN100, and PN250. Some smaller Giga versions can be supplied for high pressure service up to 430 bar. Always confirm the flange rating at the maximum operating temperature rather than at room temperature because the pressure holding capacity decreases as temperature rises.
Wetted materials for standard sensors are usually 316L stainless steel. Hastelloy C22, Alloy 718, and tantalum are available for corrosive applications. For seawater desalination plants, many buyers choose Super Duplex or a specific coating option. Silver Automation Instruments can check actual material availability for your project because regional lead times vary.
Sizing Steps for Mass Processing
Start with the minimum, normal, and maximum mass flow rate in kg/h. If the process data only shows m3/h, con
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Select the sensor so the normal flow sits between 30 and 70 percent of the meter full scale. Confirm that maximum flow does not exceed the sensor limit. Check the process temperature against the sensor rating. Check the wetted material against the chemical list. Finally, pick the transmitter output. Most Rotamass installations use 4-20 mA HART, pulse output, and Modbus or PROFIBUS for the plant automation system.
Here is the thing. If you only know the line size and product name, you cannot size a Coriolis meter properly. You need the flow range, density, viscosity, temperature, and pressure. That is why Silver Automation Instruments asks for these five values on every Coriolis inquiry.
Where Rotamass Models Fit in the Field
Rotamass Nano works well for dosing, pilot plants, and additive injection. A chemical plant in Vietnam used a Nano DN15 for catalyst dosing at 0 to 80 kg/h. Rotamass Total Insight is the default for reactor feed, batch loading, and transfer lines. Rotamass Giga fits high flow terminals, gas processing, and bunkering lines. Rotamass Prime is common in dairy, brewery, and clean utility skids.
We have seen these meters used across Australia, the Middle East, and Latin America. The model selection often changes after a proper sizing review because the first request is based on line size only. In one case, a customer in Nigeria needed a flow meter for LPG truck loading. The original DN80 spec was changed to a DN50 Giga after density and pressure drop review. That cut the cost and improved low flow performance at the same time.
Silver Automation Instruments Support for Rotamass Specs
If you are sizing a Yokogawa Rotamass Series meter or need a compatible Coriolis mass flow meter from Silver Instruments, send your pressure in bar, temperature in Celsius, pipe size in DN, and flow range in kg/h. Include the product name, viscosity, and hazardous area zone if known. Tel: +86-135-1213-1526. Whatsapp: 86-135-12131526. WeChat: +86 13512131526.
Frequently Asked Questions
What is the mass flow range of Yokogawa Rotamass Series?
The mass flow range varies by model and line size. A Rotamass Nano DN15 can measure very low flows from around 0 to 80 kg/h for many fluids. A Rotamass Giga DN200 can process much higher mass flows, sometimes several hundred tonnes per hour. Use the vendor sizing tool for the exact range.
What are the nominal line sizes for Rotamass sensors?
Common sizes include DN15, DN25, DN40, DN50, DN80, DN100, DN150, and DN200. Non standard sizes may be available through project engineering. The correct sensor size depends on the mass flow range, not just the process pipe diameter.
How accurate is the Rotamass Coriolis meter for gas?
Gas mass flow accuracy is usually specified at 0.5 percent of rate. The exact value depends on the sensor model, pressure, and flow range. Low pressure gas applications need careful sizing because the density is low and the Coriolis signal is weaker.
Which Rotamass model suits hygienic food and beverage processes?
Rotamass Prime is the common choice for food, dairy, brewery, and pharmaceutical skids. It can be supplied with polished wetted surfaces and EHEDG certified connections. The process temperature and CIP fluid list must be checked before final selection.
What process data do I need to size a Rotamass Coriolis meter?
You need minimum, normal, and maximum mass flow in kg/h. You also need operating density, viscosity, process temperature, pressure, and the wetted material requirement. If the flow data is only in volume units, convert it to mass flow using density at process conditions.
Silver Automation Instruments supports industrial flow meter selection for customers in Australia, New Zealand, Southeast Asia, the Middle East, Africa, and Latin America. Send your process data and we will return a sizing review.
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