Endress+Hauser Gammapilot FMG50 - 1.3 Documentation Types

Gammapilot FMG50
Endress+Hauser 9
Gammapilot FMG50
The Gammapilot FMG50 contains a scintillator, a photomultiplier and the electronic evaluation unit.
Incident gamma radiation generates light flashes within the scintillator. These pass to the
photomultiplier, where they are converted into electrical pulses and amplified. The pulse rate
(number of pulses per second) is an indicator of the intensity of the radiation. Depending on the
calibration, the pulse rate is converted to a level, limit switching, density or concentration signal by
the electronic evaluation unit. The Gammapilot FMG50 is available with NaI (Tl) crystals or with PVT
scintillators of different lengths, ensuring that it can be optimally adapted to each individual
application.
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1 Gamma radiation generates light flashes (photons) in the scintillator
2 The photomultiplier converts the flashes into electrical pulses and amplifies them
3 The electronic evaluation unit calculates the measured value from the pulse rate
Gamma Modulator FHG65 (optional)
In a radiometric measuring point with a Gammapilot FMG50, the Gamma Modulator FHG65 is
mounted in front of the radiation emission channel of the source container. It contains a shaft
slotted along the longitudinal axis. This shaft rotates continuously and alternately screens off the
gamma beam at a frequency of 1 Hz or allows it through. 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 Gammapilot
FMG50 can 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. This is independent of the interference radiation isotope used.
For additional information, refer to TI00423F
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1 Interference radiation
2 Gammapilot FMG50
3 Gamma Modulator FHG65
4 Source container FQG61, FQG62
The gamma modulator FHG65 and the Gammapilot FMG50 are not interconnected electrically.
When adjusting the Gammapilot , the "Beam type" parameter must be set to "Modulated".
Signal analysis Level measurement
The device's linearization function allows the user to convert the measured value to length or volume
units. A standard linearization curve for calculating the level in vertical cylinders is preprogrammed