Endress+Hauser FQG74 – Reliable Source Container for Radiometric Level and Density Measurement

The Endress+Hauser FQG74 is a robust radiometric source container designed to safely hold and position radioactive sources for demanding level and density measurement applications. It is used together with radiometric measuring systems for continuous level measurement, point level detection and multipoint density measurement, especially where conventional measurement technologies reach their limits.

With a flexible extension system and the ability to accommodate up to 20 internal radiation sources, the FQG74 provides a versatile solution for vessels with long measuring ranges, large reactors and complex process conditions.

Safe and Flexible Source Positioning

The FQG74 is designed to provide reliable radiation protection while allowing flexible positioning of multiple sources inside process vessels.

The independent rope system enables individual adjustment of each source position, with rope lengths of up to 30 m, making it suitable for applications requiring multiple measurement points across large vessels or reactors.

Key performance:

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  Measuring principle: Radiometric
  
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  Source capacity: Up to 20 radioactive sources
  
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  Source positioning: Individual flexible rope adjustment
  
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  Maximum rope length: 30 m
  
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  Weight: Approx. 800 kg
  
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  Process temperature: –52 to +450 °C
  
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  Ambient temperature: –52 to +120 °C
  
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  Process pressure: No limitation from the source container
  
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  Installation: Straight and bent dip tubes
  
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  Application: Level, point level and density measurement
  

Designed for Extreme Process Conditions

Radiometric measurement is often selected for applications where other level technologies may struggle due to extreme temperature, pressure, corrosive media, vessel geometry or internal obstructions.

The FQG74 enables measurement without direct contact with the process medium, making it suitable for:

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  High-temperature reactors
  
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  Large storage vessels
  
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  Pressurized process equipment
  
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  Aggressive chemical media
  
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  Applications with internal structures
  
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  Long measuring ranges
  

High Shielding for Enhanced Radiation Protection

The FQG74 features a robust shielding design that helps minimize radiation exposure during operation.

Its high shielding performance supports installation in accessible areas and can reduce the need for additional controlled areas depending on the specific application and regulatory requirements.

Additional safety features include:

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  Secure ON/OFF position fixation
  
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  Padlock protection against unauthorized operation
  
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  Type A approval for transport safety
  
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  Robust mechanical construction
  

Suitable for Level and Density Measurement Applications

The FQG74 works together with radiometric detectors and transmitters to provide measurement solutions for challenging industrial processes.

Typical applications include:

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  Continuous level measurement
  
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  Point level detection
  
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  Multipoint density measurement
  
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  Density profile measurement
  
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  Catalyst bed level monitoring
  
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  Reactor level measurement
  
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  Large vessel measurement applications
  

Common industries include:

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  Oil & Gas
  
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  Petrochemical
  
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  Chemical
  
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  Power generation
  
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  Minerals and metals
  

Reliable Solution for Complex Industrial Processes

The FQG74 is particularly valuable in applications where installation flexibility and measurement reliability are critical.

For example, in reactors or separation processes, multiple sources can be positioned at different elevations to monitor level changes or density variations throughout the vessel.

Its combination of flexible source arrangement, strong shielding and compatibility with radiometric measurement systems makes it a reliable choice for some of the most demanding level measurement challenges.

Frequently Asked Questions

What is the Endress+Hauser FQG74 used for?

The FQG74 is a radiometric source container used with radiation-based measuring systems for level, point level and density measurement in demanding industrial applications.

How many radioactive sources can the FQG74 hold?

The FQG74 can accommodate up to 20 internal radioactive sources.

What industries use the FQG74?

The FQG74 is commonly used in industries such as oil and gas, petrochemical and chemical processing, especially for large reactors and complex process vessels.

What is the maximum process temperature of the FQG74?

The FQG74 supports process temperatures from –52 °C to +450 °C.

Why use radiometric measurement instead of conventional level measurement?

Radiometric measurement is suitable when extreme temperatures, pressures, aggressive media, large measuring ranges or complex vessel geometries make traditional technologies difficult to apply.

Can the source position be adjusted individually?

Yes. The FQG74 uses independent flexible rope positioning, allowing individual adjustment of source locations inside the vessel.