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E&H Coriolis Flow Meter: Technical Overview of Promass Series Mass Measurement
Quick Answer
Endress+Hauser Promass Coriolis meters measure mass flow, density, and temperature directly in one device. Liquid mass accuracy can reach ±0.05% of rate. Silver Instruments supplies comparable Coriolis flow meters for industrial users across Southeast Asia, Oceania, and the Middle East. Send us your pipe size (DN), fluid, pressure (bar), temperature (°C), and flow range. We return a like-for-like price or a direct replacement option within one working day.
How Promass Sensors Deliver Direct Mass Measurement
Promass sensors use a pair of measuring tubes excited at their natural frequency. The Coriolis force generated by the fluid flow produces a phase shift between the inlet and outlet of the tubes. The phase shift is proportional to mass flow. The oscillation frequency gives density. A built-in PT100 thermometer returns process temperature. No separate flow computer is needed. The transmitter converts raw signals into 4-20 mA HART, pulse, Modbus, or EtherNet/IP outputs. That is the core principle across every Promass model from the old 80 series to the current 300 and 500 electronics.
In practice, the real challenge is not the physics. It is managing installation stress, trapped gas, and zero drift. We have seen this on customer sites in Indonesia and Nigeria. A poorly supported DN40 Promass E on a truck loading skid gave 0.3% zero offset after two months because the pipe strain shifted. Simple changes in mounting and periodic zero verification fixed it. Most engineers skip the zero check until the batch weights drift. Here is the thing: the Promass platform allows a quick field zero through the local display or via the SmartBlue app, and this often saves a return to the factory.
Key Promass Models and What They Are Built For
Seven main sensor families cover the full range from DN 1 to DN 300. Promass A targets micro flow rates as low as 0.001 kg/h with a single straight tube. It is a go-to choice for dosing fragrances or catalysts in chemical pilot plants. Promass E (DN 8 to DN 50) is the cost-optimized workhorse for general utility loops, cooling water, and basic chemical transfers. Accuracy sits at ±0.15% for mass and ±0.0005 g/cm³ for density, good enough for 90% of internal plant measurements. Promass F (DN 15 to DN 250) lifts accuracy to ±0.05% and adds a secondary containment option. We see Promass F specified most often in custody transfer of crude palm oil in Malaysia and for refined fuels in the Philippines. Its curved twin-tube design handles temperatures from -50 °C to +200 °C and process pressures up to PN 250 with the right flange material.
Promass H is a single straight tube for hygienic and corrosion-resistant duties, full-bore design, 3A and EHEDG certified. Dairy plants in Australia run Promass H for milk and whey streams because CIP solution drains completely. Promass I parallels Promass F but with a straight tube, making it easier to clean and less sensitive to high viscosity. For high-capacity bulk streams, Promass Q (DN 25 to DN 300) delivers up to 1200 t/h in a compact footprint. Promass S offers a bent tube with extreme chemical resistance (tantalum, zirconium) for concentrated acids and alkalis. You will often see it in Middle Eastern chlor-alkali plants. Promass 300 electronics pack a compact transmitter directly on the sensor. Promass 500 splits the transmitter into a remote housing, useful when the meter sits i
Outputs, Certifications, and Hazardous Area Fit
A typical Promass 300 4-wire setup delivers two 4-20 mA analog loops, one pulse/frequency output, and a subset of digital protocols: HART, Modbus RS485, or EtherNet/IP. The configurable I/O concept of Promass 300/500 lets a user define channel two as a second current output for density or temperature. Silver Instruments engineers use this flexibility when customers ask for a dual-signal flow meter: one output for mass flow to the PLC, one for density to a quality control system. Promass meters carry global hazardous area approvals: ATEX, IECEx, FM, CSA, and NEPSI for China. SIL 2/3 certification is available on specific model codes, which matters for burner fuel gas lines in offshore platforms.
Where Engineers Start to Compare Alternatives
Promass hardware is robust, but lead times can stretch past 12 weeks for non-stock configurations in our experience serving buyers in Latin America and Africa. Price also becomes a hurdle when the application does not need the full accuracy and diagnostics stack. A water treatment plant measuring sludge density does not always need ±0.0005 g/cm³. A bunkering terminal measuring heavy fuel oil at 380 cSt needs repeatability, not ppm-level mass accuracy. In these cases, site managers ask us for a comparable Coriolis meter with shorter delivery and more practical accuracy bands. Silver Instruments supplies DN 3 to DN 150 Coriolis meters with ±0.1% o.r. mass accuracy, 4-20 mA HART, and IP67 rating. They share the same process connection standards (ASME, EN, JIS) and often mount without changing pipe spools.
FAQ
Q: Can I use a Promass F for gas mass flow measurement?
A: Yes. Promass F and I handle dry gas and wet gas up to a certain flow velocity. You need to specify gas density and operating pressure when sizing. Silver Instruments also provides gas-capable Coriolis meters with on-site air calibration if your budget does not stretch to a Promass.
Q: What is the difference between Promass 300 and Promass 500?
A: Promass 300 has a compact transmitter mounted directly on the sensor. Promass 500 uses a remote transmitter connected by a cable up to 150 m. Sensor performance is the same. Choose 500 for high ambient heat, vibration, or restricted access.
Q: Do I need a straight pipe run before a Promass meter?
A: No. Coriolis meters do not require upstream or downstream straight runs. This saves spool cost and footprint versus orifice or turbine meters. Just support the pipe properly to avoid strain on the sensor.
Q: How often should I verify the zero point?
A: Before first use, after any pipework change, and at least once every six months for stable liquids. After zero verification, run the meter full of fluid at process temperature and stop flow. Press the zero function on the local display. The whole sequence takes under three minutes.
Q: Where can I get a quick price comparison for Promass equivalents?
A: Contact Silver Instruments. Send us your pressure (bar), temperature (°C), pipe size (DN), flow range, and fluid name. Email [email protected] or call +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526. Our team responds from our Nanjing office with a suitable Coriolis meter proposal, delivery timeline, and pricing in your local currency.
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