Cleaner Signals for Radiometric Measurement
Radiometric measurement can be affected by radiation that does not come from the intended measuring source. In industrial plants, nearby non-destructive material testing and other sources of background radiation can make it harder for the detector to identify the useful signal.
The FHG65 addresses this specific problem by modulating the radiation signal used for the measurement. The Gammapilot FMG50 can then distinguish the modulated useful signal from interfering radiation.
Designed to Work with Gammapilot FMG50
The FHG65 is part of a radiometric measurement system rather than a standalone level or density transmitter. Its main role is to improve signal separation for the Gammapilot FMG50.
This makes it particularly relevant where radiometric measurement has to continue in an environment with significant background or extraneous radiation.
Non-Contact Construction
The FHG65 works without direct contact with the process. There is no wetted process connection, and the official specification lists process temperature and pressure as having no limitation due to the device's non-invasive principle.
That makes the device suitable for installation alongside demanding processes where direct process contact would not be practical.
Designed for Difficult Plant Environments
The FHG65 is intended for industrial radiometric measurement applications where interference radiation can affect measurement reliability. By improving the separation between the useful signal and unwanted radiation, it can help maintain measurement availability in challenging plant conditions.
Flexible Installation Conditions
The standard ambient temperature range is -40 to +60°C. With the optional cooling jacket, the specified ambient temperature range is 0 to +120°C.
The device uses an 18–36 VDC supply and is available with international hazardous-area approvals depending on configuration.
Part of a Complete Radiometric Measurement System
The FHG65 is best understood as a supporting component within a radiometric measurement arrangement. It works together with the Gammapilot detector and associated system components rather than replacing the actual measurement instrument.
For radiometric level or density measurement, the appropriate source, detector and system configuration need to be selected together.
Key Features
- Gamma modulator for radiometric measurement
- Designed for use with Gammapilot FMG50
- Suppresses background radiation and extraneous radiation
- Helps distinguish useful radiation from interference
- Useful where non-destructive material testing creates interference
- Non-contact / non-invasive construction
- No process wetted parts
- Process temperature: no limitation from the non-invasive principle
- Process pressure: no limitation from the non-invasive principle
- Supply: 18–36 VDC
- Ambient temperature: -40 to +60°C
- With cooling jacket: 0 to +120°C
- Hazardous-area approvals including ATEX, FM, CSA, IECEx, TIIS and NEPSI depending on configuration
- Associated synchronizer: FHG66
Typical Applications
Radiometric Level Measurement
Used as part of radiometric level measurement systems where background radiation can interfere with the detector signal.
Radiometric Density Measurement
Suitable for radiometric density measurement arrangements where a cleaner measurement signal is required.
Plants with Non-Destructive Testing
Particularly useful in facilities where X-ray or other radiation-based non-destructive material testing can introduce unwanted radiation into the measurement environment.
Steel and Heavy Industry
Radiometric measurement is often selected for processes where conventional instruments are difficult to install, while the FHG65 can help address external radiation interference.
Difficult Process Environments
Because the FHG65 is non-contact, it can be used alongside processes involving high temperature, high pressure or aggressive media without direct exposure to the process.
FAQ
What is the Endress+Hauser FHG65?
The FHG65 is a Gamma Modulator used in radiometric measurement systems to suppress background and extraneous radiation.
Is the FHG65 a level transmitter?
No. The FHG65 is not the actual level transmitter or detector. It is a supporting component used to improve radiometric measurement by modulating the radiation signal.
Does the FHG65 replace the Gammapilot FMG50?
No. The FHG65 works together with the Gammapilot FMG50, allowing the detector to distinguish the useful modulated signal from interfering radiation.
Why is radiation modulation useful?
Modulation gives the measuring system a recognizable signal characteristic. The Gammapilot can use this difference to separate the intended measurement signal from background or extraneous radiation.
What type of interference can the FHG65 help suppress?
The FHG65 is specifically intended to suppress background and extraneous radiation, including interference that can result from non-destructive material testing.
Does the FHG65 contact the process?
No. The FHG65 uses a non-contact, non-invasive measurement arrangement and has no wetted process parts.
What is the power supply?
The FHG65 requires 18–36 VDC.
What is the ambient temperature range?
The standard ambient temperature range is -40 to +60°C. With a cooling jacket, the specified range is 0 to +120°C.
What is the FHG66?
The FHG66 is the synchronizer associated with the FHG65 system. The two devices are specified together in Endress+Hauser documentation for the Gamma Modulator system.
