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Original Endress+Hauser Deltapilot FMB51 Hydrostatic Level Transmitter 4-20mA HART Level Sensor

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  • Original Endress+Hauser Deltapilot FMB51 Hydrostatic Level Transmitter 4-20mA HART Level Sensor

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Original Endress+Hauser Deltapilot FMB51 Hydrostatic Level Transmitter 4-20mA HART Level Sensor
Endress+Hauser FMB51 belongs to Deltapilot M series hydrostatic level transmitter. It measures liquid level based on hydrostatic pressure principle: the built-in Contite pressure sensor detects liquid column pressure and converts pressure signal into standard electrical output for continuous level monitoring.
Wetted parts are available in stainless steel, with multiple process connections including thread and flange to fit open tanks and closed vessels. Standard signal is 4-20mA with HART protocol for easy calibration and remote debugging. Optional PROFIBUS PA is available for digital control system access.
With stable performance against foam, condensation and medium viscosity variation, FMB51 is widely used in wastewater, chemical, water supply and general industrial storage tank level measurement. SIL2 certification can be selected for safety-related process applications.
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Product Description

1. Product Overview

Endress+Hauser FMB51 is a conventional industrial hydrostatic level transmitter of Deltapilot M series, adopting mature hydrostatic liquid column measurement principle. The built-in patented Contite closed measuring cell senses hydrostatic pressure produced by liquid height; as liquid level rises or falls, pressure acting on sensor changes accordingly. The transmitter converts pressure changes into standardized electrical signals to realize continuous real-time level monitoring for open tanks and closed pressure vessels. Thanks to unique Contite fully sealed sensing structure, the instrument effectively isolates medium erosion, foam impact and condensate interference, greatly improving long-term operational stability under complicated working conditions.

2. Structure & Material Feature

Wetted components mainly adopt high-quality 316L stainless steel as standard material; customized alloy options are available for corrosive chemical medium. Multiple process connections including threaded, flange and bulkhead fittings can be selected to match different tank installation requirements. The compact transmitter housing features IP67 protection grade, capable of resisting dust, splash and damp workshop environment, adapting to indoor and outdoor industrial installation scenarios. The integral sealed sensor structure avoids medium infiltration inside core components and lowers maintenance frequency.

3. Electrical Parameter & Communication

Standard output configuration is 4–20mA analog signal with superimposed HART communication protocol. Operators can finish range setting, zero calibration and fault diagnosis remotely via HART handheld communicator or DCS control system. Optional PROFIBUS PA digital communication version supports access to intelligent factory centralized control system. Nominal supply voltage ranges from 12VDC to 36VDC DC, complying with universal industrial field power supply standard. SIL2 functional safety certification is optional for level measurement of safety interlock loops in critical production processes.

4. Measuring Performance & Working Condition

  • Measuring range: customizable from 0.1m up to 10m liquid column on demand;
  • Accuracy: standard precision reaches ±0.2%FS ~ ±0.5%FS;
  • Applicable medium temperature: -40℃ ~ +120℃;
  • Working ambient temperature: -30℃ ~ +70℃;
    Measurement result is barely affected by fluctuation of medium density, viscosity and suspended solids, suitable for various ordinary and slightly corrosive liquid measurement.

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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
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Media Water, oil, gas, air, steam and compatible liquid or gas media
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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.