Endress+Hauser Prosonic FMU41 Ultrasonic Level Transmitter Prosonic FMU41 Ultrasonic Level Gauge for Liquids & Solids

Endress+Hauser Prosonic FMU41 Ultrasonic Level Transmitter Prosonic FMU41 Ultrasonic Level Gauge for Liquids & Solids
The Endress+Hauser FMU41 ultrasonic level transmitter provides stable and accurate non-contact level measurement for liquids, slurries and bulk solids. It features high precision, built-in temperature compensation and strong anti-interference performance to ensure reliable readings in complex working conditions. With IP67 protection, durable PVDF sensor and 4–20mA+HART output, it supports easy installation, flexible wiring and long-term stable operation. Compact in structure and low in maintenance, it is widely applied in water treatment, chemical engineering, storage tanks, open channels and various industrial automation scenarios.
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Product Description

The FMU41 ultrasonic level transmitter, developed and produced by the world-renowned industrial measurement brand Endress+Hauser (E+H), is a high-performance, non-contact level measurement device designed specifically for industrial process automation. Engineered to deliver precise, reliable, and continuous level monitoring for liquids, slurries, and bulk solids, this transmitter stands out for its robust performance, user-friendly operation, and wide adaptability to harsh industrial environments, making it an ideal choice for various industries seeking efficient and low-maintenance level measurement solutions.
At the core of the FMU41’s performance is its advanced ultrasonic time-of-flight measurement principle, which ensures non-contact detection—eliminating wear, contamination, and damage caused by direct contact with corrosive, viscous, or dirty media. This non-contact design not only extends the product’s service life but also reduces maintenance costs significantly, as there is no need for frequent sensor cleaning or replacement. Equipped with built-in temperature compensation technology, the FMU41 automatically adjusts for temperature fluctuations in the operating environment, ensuring high measurement accuracy of ±2mm or 0.2% F.S. (whichever is greater), even in extreme temperature conditions ranging from -40°C to 80°C.
The FMU41 is designed with industrial practicality in mind, featuring a compact and rugged housing made of high-quality industrial-grade materials, paired with a durable PVDF sensor that offers excellent resistance to corrosion, chemicals, and mechanical impact. With an IP67 protection rating, the transmitter is fully protected against dust, moisture, and temporary submersion, making it suitable for use in humid, dusty, or harsh outdoor and indoor industrial settings. It supports flexible wiring options (two-wire or four-wire) and is equipped with 4–20mA analog output and HART communication protocol, enabling seamless integration with existing industrial control systems, easy parameter configuration, and real-time data transmission for remote monitoring and control.
User convenience is a key selling point of the FMU41. The transmitter features an intuitive envelope display that provides clear real-time level readings and status indicators, allowing on-site operators to quickly check the device’s working status and measurement data. It also supports easy on-site commissioning and calibration, with simple button operations or remote configuration via HART communicators, reducing installation and setup time. Additionally, the FMU41 boasts strong anti-interference capability, thanks to its advanced signal processing technology, which effectively filters out noise, echo interference, and environmental disturbances (such as fog, steam, and dust), ensuring stable and reliable measurement even in complex working conditions.
With its versatile performance, the FMU41 is widely applied in a variety of industrial sectors, including water supply and drainage, wastewater treatment, chemical industry, food and beverage processing, mining, metallurgy, and bulk material storage. It is suitable for measuring levels in tanks, silos, hoppers, open channels, weirs, and process vessels, handling media such as water, sewage, chemicals, oil, diesel, sludge, pulp, and bulk solids (e.g., grain, coal, and cement). Whether for continuous level monitoring, process control, or inventory management, the FMU41 delivers consistent, accurate performance to meet the diverse needs of industrial users.
As a cost-effective and reliable level measurement solution, the FMU41 combines high precision, durability, and ease of use, backed by Endress+Hauser’s professional technical support and after-sales service. It is an essential tool for industrial process automation, helping users improve operational efficiency, reduce maintenance costs, and ensure safe and stable production.

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Xinyi Instrument supplies pressure transmitters for process control, hydraulic systems, petrochemical plants, water treatment, HVAC, power generation and general industrial pressure monitoring. Our pressure transmitter range covers gauge pressure, absolute pressure, differential pressure, high temperature media and digital communication applications.

Choose from compact pressure transmitters, smart 3051 differential pressure transmitters, diaphragm seal models, RS485 digital pressure transmitters and high frequency dynamic pressure sensors. Standard outputs include 4-20 mA, voltage output, HART and RS485 Modbus options, with stainless steel wetted parts and custom process connections available on request.

Pressure Transmitter Parameters

Pressure Types Gauge, absolute, negative pressure, differential pressure
Measuring Range From low differential pressure to high pressure ranges up to 100 MPa, depending on model
Output Signals 4-20 mA, 0-5 V, 1-5 V, 0-10 V, RS485 Modbus, HART options
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Process Connection M20 x 1.5, G1/4, G1/2, NPT and customized thread connections
Wetted Materials Stainless steel, 316L diaphragm and corrosion-resistant sealing options
Media Water, oil, gas, air, steam and compatible liquid or gas media
Applications Pipeline pressure, tank level, flow differential pressure, hydraulic pressure and automation systems

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Pressure Transmitter FAQ

What is a pressure transmitter used for?

A pressure transmitter converts the pressure of liquid, gas or steam into a standard electrical signal for PLC, DCS, recorder or control instrument input. It is widely used for pipeline pressure, tank level, flow measurement and process safety monitoring.

How do I choose the right pressure transmitter?

Confirm the pressure range, pressure type, medium, temperature, output signal, accuracy, installation thread, electrical connection and environmental requirements. For corrosive media, high temperature or sanitary applications, diaphragm material and sealing structure are especially important.

What is the difference between gauge, absolute and differential pressure transmitters?

Gauge pressure transmitters measure pressure relative to atmospheric pressure. Absolute pressure transmitters measure pressure relative to vacuum. Differential pressure transmitters measure the pressure difference between two points and are commonly used for flow, filter and level measurement.

Can Xinyi Instrument provide customized pressure transmitters?

Yes. Xinyi Instrument can support customized pressure ranges, process connections, output signals, cable length, display options and model selection for different industrial applications.