F1 – Place in Conditional Service
Gem-5 User’s Manual 99
Note: GEM-5 models have at least one (and Optionally, two) layer(s) of lead
surrounding the detectors, which helps reduce the ambient background,
however, personnel moving around the monitors can contribute to
fluctuations in background (a rule of thumb used in these situations is that one
person can provide the shielding of roughly 25 mm or 1” of lead). Therefore,
try to keep extraneous personnel away from the unit while monitoring and
especially while optimizing or calibrating the unit.
For the Messages screen, a “Stay Back” variation for when an approach sensor is
activated during “Initializing Background” exists. See the F3 – Setup, F1 – Common
Values, Approach Sensor during Initialize Background setting. Also, see the F3 –
Setup, F11 – Instructions, F8 – Messages, Stay Back setting. The “Go Back”
variation is qualified by reason (“Position Timeout”, “Background Change”, “Manual
Stop” or “Dosimeter Reader Fault”). See F3 – Setup, F11 – Instructions, F3 – Go
Back settings. The Please Wait – Initializing variation can show “Database
Maintenance” in lower left when appropriate. See Ctrl+F10 – Factory Setup, F9 –
Database settings and F3 – Setup, F11 – Instructions, F8 – Messages, Database
Maintenance setting. The application of F3 – Setup, F1 – Common Values
Approach Sensor during Initialize Background set to “Ignore” choice allows the
background to update when approach sensor is active.
F1 – Place in Conditional Service
If one or more zones are set on the Faults screen as In Service is set to “NO” and
Allow Conditional Service is enabled (see F1 – Model Selection screen), then
“F1 – Place in Normal Service” will change to “F1 – Place in Conditional Service”
mode here. See Determining Faults starting on page 223 for complete details on the
use of this screen. All zones are checked to see if they are allowed to alarm (see F3 –
Setup Menu, F3 – Detection Zones, F1 – Zone Configuration and F2 - (Zone)
Settings) and if they are “In Service” (F4 – Faults screen on page 221). If no zones
will alarm then “F1 – Place in…Service” is greyed out and reason is shown
underneath (i.e. the monitor is not allowed to be placed in service if it cannot alarm).
The reason can be (No Zones are In Service), (No Zones are allowed to Alarm) or
(No Zones are allowed to Alarm if Radon is Detected).
(No Zones are In Service) is set when all zones are set “In Service NO” on the
F4 – Faults screen on page 221 screen.
(No Zones are allowed to Alarm) is set when all zones that are “In Service YES”
on the F4 – Faults screen on page 221 are also set “Detector and Sum Zone
Alarm NO” on the F3 – Setup, F3 – Detection Zones, F1 – Zone Configuration
and F2 - (Zone) Settings screens (Alt+1, Alt+2 and Alt+3; where applicable).
(No Zones are allowed to Alarm if Radon is Detected) is set when F3 – Setup,
F10 – Radon Rejection, Don’t allow Sum Zones to Alarm on All Detectors if
any show radon is set and remaining zones are either “In Service NO” or
“Alarm NO”. This doesn’t apply to the GEM-5.
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