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Brand: Endress+Hauser (E & H)
Endress+Hauser Promass H 300 Corrosion-Resistant Coriolis Meter
Description
Promass H 300 Coriolis flowmeter with tantalum or zirconium measuring tube
The Endress+Hauser Promass H 300 is the corrosion-resistant member of the Promass 300 range. Its single bent measuring tube is made of tantalum 2.5W or zirconium 702 (UNS R60702), and the wetted process connection surfaces use the same metal, so aggressive media never touch the stainless-steel flange or sensor body. Nominal sizes run from DN 8 to DN 50 (3/8 to 2 in), with liquid full-scale values from 2,000 to 70,000 kg/h. The Proline 300 transmitter adds a touch display, WLAN access and up to three I/Os. Seven Star LLC supplies the Promass H 300 in Oman and the GCC as an independent supplier in Muscat.
The meter reports mass flow, density and temperature together and derives volume flow, corrected volume flow, reference density and concentration where the application package is fitted.
Reading the Promass H 300 designation
- Promass H: single-tube sensor with minimal pressure loss and chemically resistant wetted materials.
- 300: Proline 300 transmitter in aluminium, hygienic stainless or cast stainless housing; the cast stainless option adds about 6 kg.
- The measuring tube choice is part of the order code: option DA selects zirconium 702 and option EA selects tantalum 2.5W.
Because tube material decides what the meter can safely measure, the order code should always be derived from a fluid compatibility check, not from the size alone.
Promass H 300 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Endress+Hauser / Promass H 300 (Proline Coriolis flowmeter) |
| Sensor | Single bent tube Coriolis, DN 8 to DN 50 (3/8 to 2 in) |
| Liquid full-scale values | DN 8: 2,000; DN 15: 6,500; DN 25: 18,000; DN 40: 45,000; DN 50: 70,000 kg/h |
| Mass and volume flow accuracy (liquids) | ±0.10 % of reading |
| Mass flow accuracy (gases) | ±0.50 % of reading, tantalum tube only |
| Density accuracy (liquids) | ±0.0005 g/cm³ reference; ±0.02 g/cm³ standard; ±0.002 g/cm³ wide-range option |
| Repeatability | ±0.05 % (liquids); ±0.25 % (gases, tantalum); density ±0.00025 g/cm³ |
| Zero point stability | DN 8: 0.40; DN 15: 0.65; DN 25: 1.80; DN 40: 9.00; DN 50: 14.00 kg/h |
| Medium temperature | Zirconium 702: −50 to +205 °C; tantalum 2.5W: −50 to +150 °C |
| Medium density | 0 to 5,000 kg/m³ |
| Pressure ratings | Up to PN 40 / Class 300 / 20K depending on connection |
| Wetted materials | Measuring tube and wetted connection: tantalum 2.5W or zirconium 702; sensor and flange body 1.4301 (304) |
| Supply voltage | DC 24 V ±20 % or AC 100 to 240 V, 50/60 Hz; maximum 10 W |
| Ambient temperature | −40 to +60 °C (−50 to +60 °C with option JP); display readable −20 to +60 °C |
| Protection | IP66/67, Type 4X; IP69 with sensor option CM |
| Weight (DN 8 / 15 / 25 / 40 / 50) | 10 / 11 / 17 / 34 / 67 kg with PN 40 flanges and aluminium transmitter |
Why the Promass H 300 uses tantalum or zirconium
Both metals form a stable protective oxide that gives high resistance to many aggressive chemicals where stainless steels and nickel alloys are attacked. The trade-off is temperature and compatibility: tantalum is rated to +150 °C and also allows gas measurement, while zirconium reaches +205 °C but is only specified for liquids in this datasheet. The datasheet itself does not list chemical resistance, so the fluid, concentration and temperature must be checked against a corrosion reference before the tube is chosen.
Measuring principle of the Promass H 300
The single tube is excited at resonance and the fluid inside it generates Coriolis forces that shift the phase between inlet and outlet pickups in proportion to mass flow. Density comes from the resonance frequency and tube temperature provides compensation. A counter-mass balances the system. The Gas Fraction Handler in the transmitter helps keep readings steady when gas bubbles disturb a liquid line, on the HART, Modbus RS485 and PROFINET versions.
Process connections and approvals for the Promass H 300
This model is built with fixed flange connections: EN 1092-1 (DIN 2501 and DIN 2512N), ASME B16.5 and JIS B2220. Hazardous-area versions follow separate Endress+Hauser safety instructions, and the datasheet gives equipment protection level Gb (Zone 1 in the measuring tube) for the Ex options. With the functional-safety option the meter may be used for flow monitoring up to SIL 2 single-channel and SIL 3 with homogeneous redundancy, evaluated to IEC 61508. Only options ordered with the device carry these approvals.
Comparison with other Promass 300 sensors
The Promass E 300 uses 904L tubes up to DN 80 for general duty, the Promass A 300 serves very small flows, and the Promass F 200 gives wider material choice including Alloy C22. Select the Promass H 300 when acids, chlorinated media or other fluids rule out stainless steel and nickel alloys.
Selection checklist for the Promass H 300
- Fluid, concentration and maximum temperature to select tantalum or zirconium.
- Flow range per DN size and whether gas measurement is needed (tantalum only).
- Flange standard and pressure class up to PN 40 or Class 300.
- Transmitter housing, power supply and I/O or fieldbus layout.
- Zone marking, SIL and certificates required.
- Whether the application package for concentration or special density is needed.
Installation and maintenance of the Promass H 300
Mount so that the tube stays full and gas cannot collect, preferably at the lowest point of a vertical line or downstream of a pump. Do not insulate the transmitter housing. Gasket and bolting materials must also suit the fluid, because the wetted connection surface is tantalum or zirconium rather than stainless steel. Zero the meter at standstill with the line filled, and keep records of Heartbeat verification when the package is available. Rinse the line before removal if the process fluid is hazardous.
Typical applications of the Promass H 300 in Oman and the GCC
Typical uses in the region include acid and chemical dosing and transfer in petrochemical and fertiliser plants, chlor-alkali and water-treatment chemical handling, metal finishing and process lines carrying hot or corrosive reagents. In hot weather, keep the transmitter shaded and observe the temperature derating tables for insulated lines.
Information to send with your RFQ
- Nameplate or order code of the existing meter.
- Fluid name, concentration, temperature and pressure.
- Flow range and line size, flange standard and class.
- Output, supply voltage and zone marking.
- Certificates required with delivery.
Documents and quotation
The Endress+Hauser Technical Information for the Promass H 300 is attached on this page as a datasheet. Send the part number and your duty data and we will confirm configuration, lead time and availability for Oman and the GCC.
Other Models in the Eh Promass Coriolis Range
Seven Star LLC supplies models from the Eh 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 P 100 Hygienic Coriolis Flowmeter | Flowmeters | View details |
| Endress+Hauser Promass A 100 Low-Flow Coriolis Flowmeter | Flowmeters | View details |
| Endress+Hauser Promass A 300 Coriolis Mass Flowmeter | Flowmeters | View details |
| Endress+Hauser Promass E 300 Coriolis Mass Flowmeter | Flowmeters | View details |
| Endress+Hauser Promass F 200 Loop-Powered Coriolis Flowmeter | Flowmeters | View details |
| Endress+Hauser Promass H 300 Corrosion-Resistant Coriolis Meter | Flowmeters | You are viewing this model |
Datasheets & Documents
- Datasheet Endress+Hauser Promass H 300 Technical Information 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 H 300 Corrosion-Resistant
Answers from our engineering team on installation, compatibility and integration.
01What tube materials are available on the Promass H 300?
The measuring tube is tantalum 2.5W or zirconium 702 (UNS R60702). Tantalum is rated to +150 °C and zirconium to +205 °C.
02Can the Promass H 300 measure gases?
The datasheet specifies gas mass flow accuracy of ±0.50 % of reading for the tantalum version only. Zirconium versions are specified for liquids.
03What are the size and pressure limits of the Promass H 300?
Sizes run from DN 8 to DN 50 (3/8 to 2 in), and pressure ratings go up to PN 40, Class 300 or 20K depending on the flange standard.
04Does the Promass H 300 have hygienic connections?
No. This model uses fixed flange connections only: EN 1092-1, ASME B16.5 and JIS B2220. Hygienic clamp connections belong to other Promass models.
05How accurate is the Promass H 300?
Liquid mass and volume flow accuracy is ±0.10 % of reading with repeatability of ±0.05 %. Density accuracy is ±0.0005 g/cm³ under reference conditions.
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