Endress+Hauser Levelflex FMP51 Guided Radar Level Transmitter

Name: Endress+Hauser Levelflex FMP51 – Price in Oman – Manual
Brand: Endress+Hauser (E & H)

Description

Overview

The Endress+Hauser Levelflex FMP51 is a guided wave radar level transmitter for continuous level measurement of liquids, pastes, and slurries, as well as interface measurement between two liquid layers. Its guided-wave time-of-flight principle delivers maximum reliability even with moving surfaces, foam, or tanks with numerous internal baffles that interfere with non-contact measurement methods.

Backed by manufacturer datasheet documentation, Seven Star LLC proudly supplies the Endress+Hauser Levelflex FMP51 to process plants and storage terminals across the Sultanate of Oman and the wider GCC, backed by genuine factory calibration, full documentation, and local technical support.

Measurement Principle

The Endress+Hauser Levelflex FMP51 operates on the time-domain reflectometry (guided radar) principle. A low-energy microwave pulse is launched down a probe – rod, rope, or coax – that extends into the vessel; when the pulse reaches the surface of the medium, part of its energy is reflected back and the time-of-flight is measured to determine the exact level.

Because the signal is guided along the probe rather than radiating freely through the vessel headspace, measurement is not affected by changing media properties, temperature changes, gas blankets, or vapors. This makes the Levelflex FMP51 reliable in applications where non-contact radar struggles, including turbulent surfaces, foam layers, and vessels with agitators or heating coils.

Engineering Design of the Endress+Hauser Levelflex FMP51

The FMP51 is available with rod probes measuring up to 10 m (separable version; one-piece rods up to 4 m), coax probes up to 6 m, or rope probes extending up to 45 m, giving flexibility across tank sizes from small buffer vessels to tall storage silos. It is rated for process temperatures from –50°C to +200°C and pressures from –1 to +40 bar, with measurement accuracy of ±2 mm.

The transmitter supports HART, Modbus, PROFIBUS, FOUNDATION Fieldbus, or Bluetooth communication, and includes Heartbeat Technology for self-diagnosis and continuous monitoring that increases system availability. Ex and SIL-rated versions are available for hazardous-area and safety-instrumented installations.

Key Features

The Endress+Hauser Levelflex FMP51 is engineered for reliable level and interface measurement under difficult tank conditions, and the Endress+Hauser Levelflex FMP51 is a proven solution across process and storage applications:

Delivers measurement accuracy of ±2 mm regardless of changing media or vapor conditions.
Measures up to 45 m with a rope probe, 10 m with a separable rod probe, or 6 m with a coax probe.
Remains unaffected by foam, moving surfaces, gas blankets, or internal tank baffles.
Handles process temperatures from –50°C to +200°C and pressures from –1 to +40 bar.
Supports interface measurement between two liquid layers in addition to standard level readings.
Includes Heartbeat Technology for self-diagnosis and continuous system health monitoring.
Is available in Ex-certified and SIL-rated versions for hazardous and safety-critical installations.
Communicates via HART, Modbus, PROFIBUS, FOUNDATION Fieldbus, or Bluetooth.

Industrial Applications

The Endress+Hauser Levelflex FMP51 is specified for storage tank level monitoring, chemical process vessels, interface measurement in oil-water separators, and any application where foam, agitation, or vapor makes non-contact radar unreliable. Its wide temperature and pressure ratings also suit high-temperature process vessels in refining and petrochemical operations.

Working closely with plant engineers in the region, Seven Star LLC distributes the Levelflex FMP51 to industrial and storage facilities throughout Oman and the GCC, including projects in the Sohar and Salalah economic zones, refining and petrochemical terminals, and water and wastewater treatment plants, with technical support with selection.

Technical Specifications

Key technical parameters for the Endress+Hauser Levelflex FMP51 are summarized below.

Parameter	Specification
Model	Endress+Hauser Levelflex FMP51
Measuring Principle	Guided wave radar (time-of-flight)
Measuring Range	Up to 6 m (coax), 4 m (one-piece rod), 10 m (separable rod), 45 m (rope)
Accuracy	±2 mm
Process Temperature	-50 °C to +200 °C, depending on seal
Process Pressure	–1 to +40 bar
Probe Types	Rod, rope, coax
Communication	HART, Modbus, PROFIBUS, FOUNDATION Fieldbus, Bluetooth
Rod probe	One-piece max 4 m (316L or Alloy C); separable 16 mm rod max 10 m (316L), sections 500 or 1000 mm
Rope / coax probe	Rope max 45 m (316L, Alloy C or PFA-coated 316L); coax max 6 m
Rope range by dielectric constant	DC 1.6-1.9: 15 to 22 m; 1.9-2.5: 22 to 32 m; 2.5-4: 32 to 42 m; 4-7: 42 to 45 m; above 7: 45 m
Blocking distance (factory)	Coax 0 mm; rod and rope up to 8 m: 200 mm; over 8 m: 0.025 × probe length
Accuracy detail	±2 mm up to 15 m, ±10 mm above 15 m; non-repeatability 1 mm or better
Interface measurement	Range limited to 10 m; upper medium DC max 10 and known; DC difference above 10; min. upper layer 60 mm
Interface accuracy	±10 mm; ±40 mm if the upper layer is thinner than 100 mm
Seal temperature limits	FKM -30 to +150 °C; EPDM -40 to +120 °C; FFKM Kalrez -20 to +200 °C; FVMQ -50 to +130 °C
Supply voltage (terminal)	HART: 11.5 to 35 V (Ex ia 11.5 to 30 V; Ex d 13.5 to 30 V); +2 V with Bluetooth module
Measuring frequency spectrum	100 MHz to 1.5 GHz
Tensile load of rope	4 mm rope 316 or Alloy C: 5 kN; PFA-coated 316L rope: 1 kN
Housings / protection	GT18 316L, GT19 plastic PBT, GT20 aluminium; IP68 NEMA 6P and IP66 NEMA 4X; remote sensor with 3, 6 or 9 m cable
Approvals detail	SIL 2, SIL 3 in homogeneous redundancy; WHG; steam boiler approval; marine GL/ABS/LR/BV/DNV; NACE MR0175 / MR0103
Predecessor	Levelflex M FMP40

FMP51 Probe Selection and Measuring Range by Dielectric Constant

The Levelflex FMP51 can be fitted with a rod, rope or coaxial probe, and the achievable range depends on both probe type and the dielectric constant of the liquid. One-piece rod probes are limited to 4 m; the 10 m figure applies to the separable 16 mm rod, which is assembled from 500 mm or 1000 mm sections and is useful where headroom above the vessel is restricted. Coaxial probes reach 6 m in all medium groups, including liquefied gases with a dielectric constant of only 1.4.

For bare rope probes, Endress+Hauser tabulates 15 to 22 m for liquids with a dielectric constant of 1.6 to 1.9, 22 to 32 m for 1.9 to 2.5 (mineral oils and fuels), 32 to 42 m for 2.5 to 4, 42 to 45 m for 4 to 7 and the full 45 m above 7. PFA-coated rope probes are rated lower, from 9 to 14 m in the lowest group up to 32 to 45 m above a dielectric constant of 7. Buildup, especially from moist products, can reduce the range further.

The factory-set upper blocking distance is 200 mm for rod and rope probes up to 8 m long and 2.5 % of the probe length beyond that; coaxial probes have none. It can be reduced to 100 mm in media with a dielectric constant above 7. Accuracy is ±2 mm for measuring distances up to 15 m and ±10 mm above 15 m, with an installation-dependent zero offset that is corrected during commissioning.

FMP51 Interface Measurement Conditions and Mounting Rules

Interface measurement with the FMP51 is subject to defined conditions. The dielectric constant of the upper liquid must be known, constant and no higher than 10, and the difference between upper and lower medium must exceed 10. The upper layer must be at least 60 mm thick, and emulsion layers up to 50 mm are tolerated. The interface measuring range is limited to 10 m. Stated interface accuracy is ±10 mm, widening to ±40 mm when the upper layer is thinner than 100 mm.

For mounting, rod and rope probes need more than 50 mm clearance to a smooth metallic wall, more than 300 mm to metal parts outside a plastic vessel and more than 500 mm to a concrete wall; coaxial probes can be placed at any distance. Nozzles should be no more than 150 mm in diameter and 150 mm high, with the nozzle end flush with the tank ceiling. The seal sets the temperature limit at the process connection: FKM to +150 °C, EPDM to +120 °C and Kalrez to +200 °C.

Why Choose Seven Star LLC for Endress+Hauser Guided Radar Level Transmitters

Choosing between a rod, rope, or coax probe for a guided radar transmitter depends entirely on your actual tank geometry, medium, and whether you need interface measurement between two liquid layers — a probe picked without that context can end up too short, too flexible for a turbulent tank, or unsuited to the dielectric contrast the interface reading depends on. Seven Star LLC works with your process engineers to confirm the correct Levelflex FMP51 probe type and length against your vessel’s real internal conditions before order confirmation, drawing on our trusted Endress+Hauser suppliership across Oman and the wider GCC. We also support storage terminals and process plants in Sohar and Salalah with SIL-rated configuration guidance for safety-relevant level loops and coordinated delivery for tank farm instrumentation projects, along with guidance on Heartbeat Technology self-diagnosis for planning predictive maintenance rather than reactive probe replacement.

Request a Quote for Endress+Hauser Levelflex FMP51 Guided Radar Level Transmitter

For tanks and vessels standardizing on the Endress+Hauser Levelflex FMP51, Seven Star LLC is ready to support your project with a formal RFQ, technical datasheet, and delivery timeline. Our instrumentation engineers provide technical support with selection across Oman and the GCC, with lead time confirmed at quotation. With fast quotation turnaround and technical support, contact our instrumentation division today to configure the right Levelflex FMP51 probe type for your application, complete with genuine calibration certificates and full documentation.

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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 Levelflex FMP51 Guided Radar Level

Answers from our engineering team on installation, compatibility and integration.

01Why choose guided radar over non-contact radar for difficult tank conditions?

Because the microwave pulse travels along a physical probe rather than radiating freely, the Levelflex FMP51 remains accurate with foam, moving surfaces, gas blankets, vapors, and tank baffles that commonly interfere with non-contact radar measurement.

02Can the Levelflex FMP51 measure the interface between two liquids?

Yes. In addition to standard level measurement, the FMP51 can measure the interface between two liquid layers of differing dielectric properties, such as oil over water in separator vessels.

03How long a probe is available for tall storage tanks?

The Levelflex FMP51 is available with a rope probe measuring up to 45 meters, a separable rod probe up to 10 meters, or a coax probe up to 6 meters, covering everything from small buffer vessels to tall storage silos.

04Is the Levelflex FMP51 suitable for hazardous-area or safety-instrumented installations?

Yes. Ex-certified and SIL-rated versions of the FMP51 are available, and the device includes Heartbeat Technology for continuous self-diagnosis and system health monitoring.

05Is Seven Star LLC an experienced supply partner for Endress+Hauser products?

Yes. Seven Star LLC supplies Endress+Hauser (E & H) products to customers in Oman and the GCC and can provide the manufacturer documentation and technical support on request.