The Sentry is a Personal Alarming Dosimeter and Rate Meter that measures gamma and x-ray radi-
ation and provides dose rate monitoring in a small rugged package. The Sentry works with the
Sentry Software, which can assist in tracking exposure to generate incident reconstruction and
analysis.
The Sentry employs two bright pulsating LEDs, an Audio Alert, and/or a Vibration Alert for the selec-
table alert levels. Coupled with the software, The Sentry can provide dose measurement, dose rate
measurement, and dose history and also enables you to easily set the alert to your desired levels for
dose and rate.
User Interface
LEDs
Located on the left of the endpanel
are two LEDs labeled Dose and
Rate. The LED labeled Dose will
light when the Dose warning or alert
is going off. The LED labeled Rate
will light when the Rate warning or
alert is going off.
Switches
The Sentry has two switches on the
top of the unit. The first, located
near the center of the end panel,
controls the power (ON/OFF), the
audio alarm (Audio only), or the
vibration alarm (Vibrate only).
The second switch, located on the right of the unit, controls the audio clicks that sound with every
count. It has two icons labeling the positions. Clicks on. Clicks off. This switch is also used to turn off
active alerts and warnings.
Alert Modes
Audio and Vibrate Mode
When The Sentry is initially switched on, the Sentry will conduct an alarm test where you will hear
one high to low alert and feel a vibration.
The audio alert consists of two stages.
1.
The first stage is a warning where the audio alert pulsates from high to low with a 1 second
delay between them accompanied by a pulsating vibration while the LED flashes to indicate a Rate
or Dose Warning. The warning is triggered when you are approaching the threshold that you have
set for your alert.
2.
The second stage of the alert sounds when you have reached the settable threshold. The full
alert is a pulsating alert with no pause accompanied by a pulsating vibration while the LED remains
solid. The LED indicates a Rate or Dose Alert.
Fig. 1 Sentry Button and LED Functions
