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Brand: Endress+Hauser (E & H)
Endress+Hauser Promass X 300 Coriolis Mass Flowmeter
Description
Promass X 300 four-tube Coriolis meter for the largest flow rates
The Endress+Hauser Promass X 300 is the highest-capacity Coriolis flowmeter in the Promass family. A compact four-tube sensor covers nominal diameters DN 300, 350 and 400 (12, 14 and 16 in) with a liquid full-scale range of up to 4 100 t/h, yet it keeps pressure drop low and gives mass-flow accuracy of ±0.10 % of reading, or ±0.05 % with the PremiumCal option. The maker aims it at on- and offshore oil and gas, where a single installation point must meter large quantities with premium accuracy. Seven Star LLC supplies the Promass X 300 in Oman and the GCC as an independent supplier in Muscat.
Promass X 300: sensor, transmitter and what the name decodes to
“Promass X” is the extra-large sensor family, a bent four-tube system. “300” stands for the Proline 300 transmitter with a dual-compartment housing, up to three I/Os, a backlit touch display and WLAN access. The Promass X 300 is a compact device with the transmitter on the sensor, and a remote display is available. Coated aluminium and cast stainless housings are offered. The sensor housing, measuring tubes and flange connections are stainless steel (1.4404 / F316L), and the datasheet describes the whole exterior as 316L-type material.
Promass X 300 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Endress+Hauser Promass X 300 (Proline Promass X 300, product root 8X3B) |
| Measuring principle | Coriolis, bent four-tube sensor |
| Nominal diameters | DN 300, 350, 400 (12, 14, 16 in) |
| Liquid full-scale range | 0 to 4 100 t/h at all three sizes (0 to 4 520 US tons/h) |
| Turndown | Over 1000:1 |
| Mass and volume flow accuracy (liquids) | ±0.10 % of reading standard; ±0.05 % mass flow with PremiumCal |
| Mass flow accuracy (gases) | ±0.35 % of reading |
| Density accuracy (liquids) | ±0.0005 g/cm³ (standard and extended density calibration) |
| Repeatability (liquids) | ±0.05 % of reading; ±0.025 % with PremiumCal; density ±0.00025 g/cm³ |
| Zero point stability | 137 kg/h at DN 300, 350 and 400 |
| Medium temperature | –50 to +180 °C (–58 to +356 °F) |
| Process pressure | Up to PN 100, Class 600 (lower classes available) |
| Wetted materials | Measuring tubes 1.4404 (316/316L); connections 1.4404 (F316/F316L) |
| Process connections | EN 1092-1 (DIN 2501 and DIN 2512N) and ASME B16.5 fixed flanges |
| Weight (Class 150 flanges, aluminium housing) | DN 300: 553 kg; DN 350: 577 kg; DN 400: 601 kg |
| Ambient temperature | –40 to +60 °C |
| Medium density | 0 to 5 000 kg/m³ |
Working principle and large-line behaviour of the Promass X 300
Four measuring tubes oscillate at resonance, and the Coriolis effect shifts the phase between inlet and outlet pick-ups in step with mass flow. Splitting the stream over four tubes is what keeps pressure drop modest at these flow rates. Density follows the resonance frequency, tube temperature is measured for compensation, and volume flow, corrected volume flow (API-table based) and reference density are calculated. The meter works without inlet or outlet runs, which is valuable where space on a large skid or manifold is limited.
Choosing between the Promass X 300 and neighbouring meters
The Promass X 300 starts where the Promass Q 300 (up to DN 250, 2 400 t/h) ends. If your line is DN 250 or smaller and you need cryogenic or custody-transfer grade, look at the Promass Q 300. For high pressure beyond Class 600, the Promass O 300 reaches PN 250 at DN 80 to 250, and for smaller hygienic or viscous service the Promass I 100 is the model.
The transmitter supports HART, Modbus RS485, EtherNet/IP, PROFIBUS DP, PROFINET and FOUNDATION Fieldbus variants. Functional safety monitoring up to SIL 2, or SIL 3 with a redundant architecture, is possible on the LA option, and approval options exist for hazardous areas, with equipment protection level Ga/Gb (Zone 0 in the measuring tube) on approval codes BA to BD. The meter can be ordered with optional OIML R117 legal metrology testing for liquids other than water, and OIML R137 for gas. Marine approvals are listed.
Selection checklist for the Promass X 300
- Line size and flow: three sizes share the same 4 100 t/h full-scale value, so pick DN to match the pipe and the pressure loss you accept.
- Pressure class: EN or ASME flange rating, confirmed against the pressure-temperature diagram.
- Medium and temperature: up to +180 °C, with density in the 0 to 5 000 kg/m³ range.
- Accuracy: standard or PremiumCal, and extended density calibration if density is a key output.
- Custody transfer or allocation: legal metrology option and national approval.
- Electrical: power supply, outputs, fieldbus, housing, remote display.
- Handling: the sensor weighs 553 to 601 kg, so plan crane access and supports.
- Documentation: weld inspection reports (ISO 23277, ASME B31.3, ASME VIII or NORSOK M-601) can be ordered.
Installing and commissioning the Promass X 300
Fit the sensor with the flow arrow aligned to the pipe, support the line on both sides so the meter does not carry pipe loads, and avoid cavitation, since the no-run installation rule assumes none. Gas velocity in the tubes should stay below half the speed of sound. For a heavy sensor use flange gaskets and bolting to the class specified. Use the Applicator sizing tool to check the pressure drop and measuring error. On start-up verify the zero with a full line and use Heartbeat Technology to record a baseline. A weather protection cover can be ordered for outdoor sites.
Maintenance is limited to periodic verification, diagnostics review and checks of the cable glands and housing covers; there are no wear parts in the flow path.
Promass X 300 applications in Oman and the GCC
Typical roles include crude oil and condensate export and allocation, tank-farm and loading-arm transfer, large product pipelines, large chemical and fuel transfer lines in petrochemical and power sites, and bulk ship-loading. Because of its ability to take 4 100 t/h in a single run, the Promass X 300 can replace banks of smaller meters. Hot, dusty and humid conditions are handled by the IP66/67 transmitter and the –40 to +60 °C ambient rating, and shaded mounting is recommended in direct summer sun.
Promass X 300 sizes compared
| DN | Inch | Full scale (t/h) | Zero point stability (kg/h) | Weight (kg) |
|---|---|---|---|---|
| 300 | 12 | 4 100 | 137 | 553 |
| 350 | 14 | 4 100 | 137 | 577 |
| 400 | 16 | 4 100 | 137 | 601 |
What to include in a Promass X 300 RFQ
- Order code or nameplate photo
- Fluid, density, normal and maximum flow, pressure and temperature
- Line size, flange standard and rating
- Accuracy, custody-transfer and density requirements
- Power, outputs, fieldbus, hazardous-area approvals
- Delivery point in Oman or the GCC and timing
Documents and quotation
The Endress+Hauser Technical Information (datasheet) for the Promass X 300 is attached on this page and gives ranges, accuracy, pressure-temperature curves and weights.
Send the order code or your line size, fluid and flow, and Seven Star LLC will return a quotation with delivery information 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 | View details |
| Endress+Hauser Promass Q 300 Coriolis Mass Flowmeter | Flowmeters | View details |
| Endress+Hauser Promass X 300 Coriolis Mass Flowmeter | Flowmeters | You are viewing this model |
| Endress+Hauser Cubemass C 300 Coriolis Mass Flowmeter | Flowmeters | View details |
Datasheets & Documents
- Datasheet Endress+Hauser Promass X 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 X 300 Coriolis Mass Flowmeter
Answers from our engineering team on installation, compatibility and integration.
01What flow can the Promass X 300 measure?
At DN 300, 350 and 400 the liquid full-scale value is 0 to 4 100 t/h. Turndown is over 1000:1.
02What is the accuracy of the Promass X 300?
Mass and volume flow are ±0.10 % of reading, with ±0.05 % mass flow available with PremiumCal. Gas mass flow is ±0.35 % and liquid density is ±0.0005 g/cm³.
03What pressure and temperature does the Promass X 300 allow?
Pressure ratings go up to PN 100 or Class 600 and the medium temperature range is –50 to +180 °C.
04How heavy is the Promass X 300?
With Class 150 flanges and the aluminium transmitter housing the datasheet lists 553 kg at DN 300, 577 kg at DN 350 and 601 kg at DN 400. A cast stainless housing adds 6 kg.
05Does the Promass X 300 need straight pipe runs?
No special inlet or outlet runs are needed behind valves or elbows as long as no cavitation occurs.
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