6
Chapter 4: Selecting Base Units of Measurement
The Set Base Unit Screen
Figure 5(1)
The Base Unit sets the units of measurment that will be used
for the Area Monitor display and the alarm set points. From the
calibration Settings screen, tap the “Base Unit…” button to open
the Set Base Unit screen
Tap the radio button next to the desired Base Unit, and the
displayed rate will immediately be converted to that unit. The
displayed value updated within 2 seconds . When finished, tap
the “Back…” button to return to the Calibration Settings screen.
The Base Unit also determines what MINIMUM subunit will be displayed. For example, if the base unit is mR/h
and the radiation field on the detector is 80 µR/h, the displayed value will be 0.1 mR/h.
Figure 5(1)
DB-9 Relay Connector
The Radiation Alert Area Monitor can interface with external
triggers and external strobes/horns via the DB-9 relay connector,
located on the bottom of the unit.
See “Appendix C: Relay and
Triggers Technical Info” for more information.
Connecting The Remote Alarm
Connect the remote alarm with a standard serial cable by
plugging the female end of the cable into the bottom of the area monitor and the male end into
the bottom of the remote alarm. Once the unit is connected, you can set alarm response settings in the Set
Alarm Indicators screen.
Note: All alarm indicators can be modified directly on the Area Monitor or via the Area
Monitor PC software.
To enter the set alarm indicators screen
(Figure 6(2))
, use the included pin, a paper clip, or another small
object to press the recessed button on the bottom of the Area Monitor. This will cause the Passkey Screen to
display:
Figure 4(1).
Enter your passkey and select the set button, then select the Indicators button to open the
Set Alarm Indicators screen. The strobe and siren settings only apply to the local unit. The relays control the
remote alarm, and the remote alarm’s strobe and audio settings are built into the alarm.
Assigning any alarm to relay A will cause the audible alarm to sound and the strobe light to flash, without
pause when triggered in the remote alarm. Relay A is generally intended for the high alarm.
Relay B will cause the audible alarm to cycle on and off for about one second each when triggered in the
remote alarm. The strobe will flash continuously. Relay b is generally intended for the low alarm.
Relay C will cause the audible alarm to make a short “blip” about once per second when triggered in the
remote alarm. The strobe will flash continuously. Relay C is generally intended for the fail alarm.
Chapter 5: Connecting Relays and Triggers
Figure 6(2)