The Yokogawa Rotamass Nano is the premier choice for highly accurate measurement at the lowest flow rates. Featuring the world’s smallest dual bent tube design, it effectively compensates for fluctuations in density, temperature, and pressure, ensuring consistent repeatability in demanding R&D and industrial environments.
Beyond direct mass flow, the Rotamass Nano provides a holistic view of your process throughout its entire lifecycle:
| Chemical & Lab | Chemical injection, R&D laboratory, Dosing systems |
| High-Tech Manufacturing | Vacuum thin film coating, Precision coatings, Metrology |
| Process Control | Batching, Blending, Metering pump control |
Q: Why is the dual-tube design important for low flow?
A: The dual-tube design in the Rotamass Nano cancels out environmental noise and process fluctuations, providing a much higher signal-to-noise ratio for micro-flow measurements than single-tube designs.
Q: Can it measure gas flow?
A: Yes, it is designed for both liquid and gas low-flow measurement, including high-pressure gas applications.
Refer to the General Specification sheet located under the ‘Downloads’ tab for detailed specifications.
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Product Line |
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Flow Range |
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Liquid process fluids |
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Liquids in general |
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Aggressive liquids |
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High viscous fluids |
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Gaseous process fluids |
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Gases in general |
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Low density gases |
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Mixed process fluids |
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Unmixable or mixable liquids |
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Liquids with entrained gas |
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Process conditions |
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Process temperature |
-50 to +260 °C |
-70 to +200 °C |
-70 to +140 °C |
-196 to +350 °C |
-70 to +150 °C |
-70 to +350 C or +200 C (Giga 2F) |
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Process pressure up to |
285 bar or |
100 bar |
40 bar |
100 bar or |
up to 700 bar |
100 bar or |
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Line sizes |
DN15 to DN40 |
DN15 to DN125 |
DN25 to DN80 |
DN15 to DN125 |
9/16 or 3/4“in. AutoClave |
DN100 to DN250 |
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Accuracy |
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Mass flow for liquids up to |
± 0.1 % |
± 0.1 % |
± 0.1 % |
± 0.1 % |
± 0.1 % |
± 0.1 % |
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Mass flow for gas up to |
± 0.50 % |
± 0.35 % |
± 0.35 % |
± 0.35 % |
± 0.50 % |
± 0.35 % |
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Density for liquids up to |
± 0.5 g/l |
± 0.5 g/l |
± 0.5 g/l |
± 0.5 g/l |
± 0.5 g/l |
± 2.0 g/l |
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Turndown flat accuracy |
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– |
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Materials and process connections |
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Material of wetted parts |
Alloy C-22/2.4602 & 316L/1.4404 |
316L/1.4404 |
316L/1.4404 |
316L/1.4404 or alloy C-22/2.4602 or 304/1.4301 *1 |
316L/1.4404 or alloy C-22/2.4602 or 304/1.4301*1 |
316L/1.4404 or alloy C-22/2.4602 (Giga 1F only) |
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Flange process connections |
EN, ASME, JPI, JIS |
EN, ASME, JPI, JIS |
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EN, ASME, JPI, JIS |
ASME |
EN, ASME, JIS |
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Threaded process connections |
G, NPT |
G, NPT |
DIN11851, SMS1145 |
G, NPT |
G, NPT |
− |
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Clamp process connections |
DIN32676 |
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DIN32676, JIS/ISO2852 |
DIN32676, JIS/ISO2852 |
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Sensor design |
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Insulation and heat tracing options |
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Rupture disk |
○ *1 |
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Customer & NAMUR face-to-face length |
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Approvals / Certificates |
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3-A, EHEDG, EC1935:04 and EC2023:06 |
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Marine application |
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Functional Safety |
SIL 2 (SIL3) |
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Custody transfer application |
NTEP (Nano 20) |
NTEP |
NTEP |
NTEP, INMETRO |
NTEP |
NTEP, INMETRO |
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Hazardous area approvals |
IECEx, ATEX, UKEx, FM (USA/Canada), NEPSI, INMETRO, PESO, EAC Ex, Taiwan Safety Label, Korea Ex, Japan Ex, ECAS Ex, Ukraine Ex |
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