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Brand: Endress+Hauser (E & H)
Endress+Hauser Promass O 300 Coriolis Mass Flowmeter
Description
Promass O 300 high-pressure Coriolis flowmeter in super duplex
The Endress+Hauser Promass O 300 is a Coriolis mass flowmeter made for the highest process pressures in the Promass range. Its bent dual-tube sensor is built from 25Cr super duplex stainless steel (1.4410, UNS S32750) and is rated up to PN 250 or Class 1500, with nominal diameters from DN 80 to DN 250 (3 to 10 in). The maker positions it for offshore and other demanding oil and gas service, and highlights its resistance to stress corrosion cracking. Seven Star LLC supplies the Promass O 300 in Oman and the GCC as an independent supplier in Muscat.
Reading the Promass O 300 name and construction
“Promass O” identifies the sensor: a robust bent dual-tube design for high pressure. “300” is the Proline 300 transmitter, a compact dual-compartment housing with up to three configurable inputs and outputs, a backlit touch display and WLAN access. The Promass O 300 is delivered as a compact device in a coated aluminium or cast stainless housing; a remote display is available. The sensor housing is 316L (1.4404), while the measuring tubes and the process connections are super duplex.
Promass O 300 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Endress+Hauser Promass O 300 (Proline Promass O 300, product root 8O3B) |
| Measuring principle | Coriolis, bent dual-tube sensor |
| Nominal diameters | DN 80, 100, 150, 250 (3, 4, 6, 10 in) |
| Liquid full-scale range | DN 80: 0 to 180 000 kg/h; DN 100: 0 to 350 000 kg/h; DN 150: 0 to 800 000 kg/h; DN 250: 0 to 2 200 000 kg/h |
| Turndown | Over 1000:1 |
| Mass flow accuracy (liquids) | ±0.10 % of reading standard; ±0.05 % with PremiumCal option |
| Volume flow accuracy (liquids) | ±0.10 % of reading |
| Mass flow accuracy (gases) | ±0.35 % of reading |
| Density accuracy | ±0.0005 g/cm³ standard; ±0.001 g/cm³ wide-range special density (up to DN 100) |
| Repeatability (liquids) | ±0.05 % of reading; ±0.025 % with PremiumCal |
| Medium temperature | –40 to +205 °C (–40 to +401 °F) |
| Process pressure | Up to PN 250, Class 1500 |
| Wetted materials | Measuring tube 25Cr duplex 1.4410 (UNS S32750); connections 25Cr duplex 1.4410 (F53) |
| Process connections | EN 1092-1 (DIN 2512N), ASME B16.5 and JIS B2220 fixed flanges |
| Weight (Class 900 flanges, aluminium housing) | DN 80: 75 kg; DN 100: 141 kg; DN 150: 246 kg; DN 250: 572 kg |
| Power supply | DC 24 V ±20 % or AC 100 to 240 V (–15 to +10 %), 50/60 Hz; maximum 10 W |
| Ambient temperature | –40 to +60 °C (–50 to +60 °C with test certificate option JP) |
| Ingress protection | IP66/67, Type 4X; IP69 optional |
How the Promass O 300 measures
Two parallel tubes are driven in antiphase at resonance. Flowing fluid generates Coriolis forces that twist the tube motion, and sensors at the inlet and outlet detect the resulting phase difference, which is proportional to mass flow. Density is derived from the resonance frequency and temperature from a sensor on the tube. Volume flow, corrected volume flow (including API-table based calculation) and reference density are computed from these values. Heartbeat Technology adds built-in verification of the device.
Fitting the Promass O 300 into the system
The Promass O 300 sits at the heavy end of the family. The Promass I 100 handles small hygienic lines, the Promass Q 300 offers the best accuracy and a cryogenic option up to DN 250, the Promass X 300 covers DN 300 to 400, and the Cubemass C 300 handles micro flows. Choose the Promass O 300 when line pressure exceeds what PN 100 or Class 600 sensors can take.
The Proline 300 transmitter offers HART, Modbus RS485, EtherNet/IP, PROFIBUS DP, PROFINET, FOUNDATION Fieldbus and Ethernet-APL variants, so it can feed a flow computer, a PLC or a DCS. Functional-safety use is possible up to SIL 2 in single-channel and SIL 3 in redundant architectures (order option LA), and certain approval codes give a measuring tube suitable for Zone 0.
Selection and ordering checklist for the Promass O 300
- Pressure class: confirm the flange standard (EN, ASME or JIS) and rating against the maximum line pressure and temperature curve.
- Size: choose DN so normal flow falls near 20 to 50 % of full scale; the datasheet suggests not going below about one twentieth of full scale.
- Accuracy: standard or PremiumCal for mass flow, and the density calibration needed.
- Fluid and temperature: liquids or gases up to +205 °C, and whether entrained solids require a lower velocity below 1 m/s.
- Outputs and protocol: up to three I/Os, current, pulse, relay, status or fieldbus.
- Housing and approvals: aluminium or cast stainless, hazardous area, SIL and marine certificates where needed.
- Documentation: material and weld test reports such as ISO 23277, ASME B31.3 or NORSOK M-601 are listed as ordering options.
Installing and maintaining the Promass O 300
No straight inlet or outlet runs are required behind valves, elbows or tees provided cavitation is avoided. Mount vertically so the tubes drain and are protected from build-up. Weights are substantial, from 75 kg at DN 80 to 572 kg at DN 250, so plan lifting gear and supports. Zero point stability is listed per size, for example 9 kg/h at DN 80. Commission through the touch display, a web browser over WLAN, or FieldCare and DeviceCare. Keep the transmitter out of direct sun in hot regions, and use the optional weather protection cover when it is mounted outdoors.
Routine care consists of Heartbeat Verification records, reviewing diagnostic messages, checking the cable glands, and keeping the housing cover closed. There are no wearing parts in the sensor.
Where the Promass O 300 is used in Oman and the GCC
High-pressure duties dominate: wellhead and production manifolds, gas-lift and injection lines, offshore platform export, chemical injection skids, and high-pressure test facilities. The super duplex wetted parts are chosen for stress corrosion cracking resistance, which matters on hot, salt-laden Gulf and Omani coastal sites. In power and desalination plants it can serve high-pressure fuel, boiler chemical and seawater-related duties where Coriolis accuracy is wanted.
Promass O 300 and its Promass relatives
| Model | Nominal diameter | Max. pressure rating | Medium temperature |
|---|---|---|---|
| Promass O 300 | DN 80 to 250 | PN 250, Class 1500 | –40 to +205 °C |
| Promass Q 300 | DN 25 to 250 | PN 100, Class 600, 63K | –50 to +205 °C (–196 to +150 °C cryogenic option) |
| Promass X 300 | DN 300 to 400 | PN 100, Class 600 | –50 to +180 °C |
| Promass I 100 | DN 8 to 80 | PN 100, Class 600, 63K | –50 to +150 °C |
What to send with a Promass O 300 RFQ
- Order code or nameplate photo of the unit being replaced
- Fluid, density, flow range, operating and design pressure and temperature
- Line size, flange standard and rating, and face finish
- Power supply, outputs and fieldbus, housing, display
- Hazardous area, SIL, marine and test-report requirements
- Delivery point in Oman or the GCC and the required date
Documents and quotation
The Endress+Hauser Technical Information (datasheet) for the Promass O 300 is attached on this page with ranges, accuracy, pressure-temperature curves and dimensions. Confirm your order code against it before purchase.
Send us the order code or your fluid, pressure and line size, and Seven Star LLC will quote with lead time for Oman and the GCC.
Other Models in the Promass Coriolis Range
Seven Star LLC supplies models from the Promass Coriolis range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Endress+Hauser Promass I 100 Coriolis Mass Flowmeter | Flowmeters | View details |
| Endress+Hauser Promass O 300 Coriolis Mass Flowmeter | Flowmeters | You are viewing this model |
| Endress+Hauser Promass Q 300 Coriolis Mass Flowmeter | Flowmeters | View details |
| Endress+Hauser Promass X 300 Coriolis Mass Flowmeter | Flowmeters | View details |
| Endress+Hauser Cubemass C 300 Coriolis Mass Flowmeter | Flowmeters | View details |
Datasheets & Documents
- Datasheet Endress+Hauser Promass O 300 Datasheet Download
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About brand
Endress+Hauser makes process measurement instruments for flow, level, pressure, temperature and liquid analysis. Georg H. Endress and Ludwig Hauser started the business in Lörrach, Germany, on 1 February 1953, first selling level meters, and the Endress+Hauser name has been used since 1957. The group is headquartered in Reinach, Switzerland, and has been wholly owned by the Endress family since 1975.
Seven Star LLC is an independent supplier listing Endress+Hauser flowmeters, level and pressure transmitters, temperature assemblies and liquid analysis products for buyers in Oman and the GCC. Instruments are matched from the full order code on the nameplate.
Endress+Hauser company profile
| Origin | Founded in Lörrach, Germany, on 1 February 1953 by the Swiss engineer Georg H. Endress and Ludwig Hauser |
|---|---|
| Headquarters | Endress+Hauser AG, Reinach (Basel-Landschaft), Switzerland |
| Ownership | Family owned; the Endress family has been the sole shareholder since 1975, and a family charter commits the company to stay family owned |
| Size | About 16,500 employees and sales of about EUR 3.7 billion (2023, as reported by the company) |
| Product families | Proline flowmeters, Micropilot and Levelflex radar, Liquiphant switches, Cerabar and Deltabar pressure, iTEMP and iTHERM temperature, Liquiline and Memosens liquid analysis |
Milestones
- 1953: Georg H. Endress and Ludwig Hauser start the business in Lörrach on 1 February, first selling level meters.
- 1957: The Endress+Hauser name comes into use.
- 1975: The Endress family becomes sole shareholder.
- 2023: About 16,500 employees and sales of about EUR 3.7 billion, as reported by the company.
Endress+Hauser product lines
| Line | Measuring principle | Typical use |
|---|---|---|
| Promass F 300, Promass 80F, 83F/84F | Coriolis mass flow | Direct mass flow and density of liquids and gases, hydrocarbon transfer and chemical dosing |
| Promag P 300, P 500, H 300, W 400, W 10, 50P | Electromagnetic flow | Water, wastewater, slurries and other conductive liquids |
| Prowirl F 200, 72F | Vortex flow | Steam, gas and low-viscosity liquids |
| Prosonic Flow 92F, t-mass 65F | Ultrasonic and thermal mass flow | Water lines; compressed air and industrial gases |
| Micropilot FMR62, FMR67, FMR60, FMR10B, FMR20, FMR50, FMR52 | Free-space radar level, 80 GHz and 26 GHz | Tanks, process vessels, silos and open water channels |
| Levelflex FMP51, FMP50, FMP54, FMP55 | Guided wave radar level | Level and interface in vessels, separators and bypass chambers |
| Liquiphant FTL51, Prosonic S FMU90 | Vibronic point level; ultrasonic level | High and low level alarms, pump protection, open channel flow |
| Cerabar PMC71B, PMP51B, PMP71, Deltabar PMD78B, PMD75 | Pressure and differential pressure | Process pressure, hydrostatic level and DP flow |
| iTEMP TMT82, TMT162, iTHERM TM101, TR66, TR10 | Temperature transmitters and thermometers | RTD and thermocouple points with thermowells |
| Liquiline CM444, CM442, Memosens CPS11E, Stamolys reagents | Liquid analysis | pH, ORP, conductivity, dissolved oxygen and nutrient analysis in water treatment and process |
Where Endress+Hauser instruments are used
In Oman and the GCC, Endress+Hauser instruments are common in oil and gas production and processing, refineries and petrochemicals, desalination and water networks, wastewater treatment, power plants and food and beverage plants. Coriolis meters measure hydrocarbon and chemical flows, electromagnetic meters cover water and wastewater, radar transmitters handle tank and silo level, and Liquiline analysers monitor water quality. Proline 300 and 500 flowmeters include Heartbeat Technology for in-situ verification, which reduces the need to remove a meter for checks.
Ordering Endress+Hauser instruments: what we need
The order code on the nameplate (for example PMP71-1QA1S11RDADU) defines every option: measuring range, process connection, materials, output, approvals and display. Send it with the serial number; Endress+Hauser can retrieve the original configuration from the serial number. For a new instrument add the medium, operating and design pressure and temperature, range, line size or tank geometry, process connection, wetted materials, output or protocol (4-20 mA HART, PROFIBUS, FOUNDATION Fieldbus, Modbus) and the hazardous-area approval required. Older models such as Promass 80/83 or Micropilot M are replaced by current Proline or 80 GHz Micropilot devices.
Facts checked against Endress+Hauser company history and product information, October 2026.
Browse Endress+Hauser products by category: Flowmeters, Level Transmitter, Pressure Instrumentation, Temperature, Liquid Analysis Sensors, Liquid Analytical Systems.
FAQ
Questions about the Endress+Hauser Promass O 300 Coriolis Mass Flowmeter
Answers from our engineering team on installation, compatibility and integration.
01What makes the Promass O 300 different from other Promass models?
It is the high-pressure version, with measuring tubes and connections in 25Cr super duplex and ratings up to PN 250 or Class 1500. Nominal diameters run from DN 80 to DN 250.
02What accuracy does the Promass O 300 offer?
Liquid mass flow is ±0.10 % of reading as standard and ±0.05 % with PremiumCal. Gas mass flow is ±0.35 % and density is ±0.0005 g/cm³.
03What medium temperature can the Promass O 300 handle?
The medium temperature range is –40 to +205 °C (–40 to +401 °F). Ambient temperature is –40 to +60 °C for the instrument.
04Which flange standards are available on the Promass O 300?
EN 1092-1 (DIN 2512N), ASME B16.5 and JIS B2220 fixed flanges are listed. The correct pressure class depends on the flange standard and size.
05Which communication options does the Proline 300 transmitter on the O 300 offer?
Options include 4–20 mA HART, Modbus RS485, EtherNet/IP, PROFIBUS DP, PROFINET, FOUNDATION Fieldbus and Ethernet-APL variants, with up to three configurable I/Os depending on the order code.
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