Gamma Modulator FHG65 Synchronizer FHG66
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Hauser
System requirements of FMG60
To be able to evaluate the signal generated by the Gamma Modulator FHG65, the Gammapilot M
FMG60 must be equipped with the following software at least:
• HART electronics
• For SIL devices with short point level detectors (200 mm and 400 mm): SW 01.02.02 or higher
• For all other devices: SW 01.03.02 or higher
• PROFIBUS PA electronics
SW 01.03.02 or higher
• FOUNDATION Fieldbus electronics
SW 01.03.02 or higher
Gamma Modulator FHG65
In a radiometric measuring point, the Gamma Modulator FHG65 is mounted in front of the beam
exit channel of the source container. It contains a shaft slotted along the longitudinal axis. This shaft
rotates continuously and alternately screens off, or allows through, the useful beam at a frequency of
1 Hz. Due to this frequency, the useful beam differs from fluctuating ambient interference radiation
and from interference radiation occurring sporadically (e.g. from nondestructive material testing).
Using a frequency filter, the FMG50 or FMG60 can thus separate the useful signal from interference
radiation. In this way, it is possible to continue measuring even if interference radiation occurs. This
significantly increases the measuring certainty and system availability.
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4
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A0018245
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Interference radiation
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FMG50/FMG60
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FHG65
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FQG61/FQG62
The Gamma Modulator FHG65 and the Gammapilot FMG50/FMG60 are not interconnected
electrically. When adjusting the FMG50/FMG60, the "beam type" parameter must be set to
"modulated".
Synchronizer FHG66
In a measuring point with multiple radiation sources, a Gamma Modulator FHG65 must be mounted
on every source container. The Synchronizer FHG66 synchronizes the individual modulators to
common mode. A Synchronizer FHG66 can synchronize up to three Gamma Modulators FHG65. (For
more than three modulators, see the "Cascading multiple Synchronizers FHG66" section). In addition,
the synchronizer offers a straightforward diagnostic solution for the connected Modulators FHG65,
which is beneficial when only one Modulator FHG65 is in operation.
