Background Rate
Gem-5 User’s Manual 283
The Low Background Rate check is intended for checking the detector response to
Gamma background radiation.
A service visit is required to restore the unit to service following a low background
rate alarm unless the unit is in auto recovery mode for this condition. Monitoring can
be restored with a failed detector, if permitted by the policy at the facility, by placing
the failed detector in conditional service as described in F4 – Faults on page 221.
Table 19 Summary of Background Alarm Settings
F3 – Setup Menu, F3 – Detection Zones Menu, F1 – Zone Configuration
• Background Average Period
F3 – Setup Menu, F3 – Detection Zones Menu, F2 – (Zone) Settings
F3 – Setup Menu, F3 – Detection Zones Menu, F5 – Group Settings
• High Background Rate
• Excessive Background Rate
• Low Background Rate
F3 – Setup Menu, F2 – Wait Timeouts screen
• Initialize Background Update
• Background Collect Time
• Excessive Background in Service After
• Low Background Minimum Average Period
• Zero Count Period
• Maximum Monitor Time (this affects the High Count Time fault decision)
F3 – Setup Menu, F4 – Out of Service Causes
• Low Bkg Rate
• Zero Counts
• Excessive Bkg Rate
• High Bkg Rate
• High Count Time
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