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FEATURES AND BENEFITS
Gas Risk Management is the key design philosophy be-
hind SENTRY. The user can employ those features that
are most important for a specific application, and, as the
application needs grow or change, the system can be
reconfigured at the keyboard to satisfy expanded require-
ments.
Menu Prompting
Menu prompting guides the user through system configu-
ration and operation.
Prompting, via the alphanu-
meric display, keeps the full
range of capabilities at the
operator’s fingertips. When
it is necessary to modify the
system, prompting will enable the change to be handled
quickly and correctly.
Sensor Scan Display
Current sensor gas exposure readings can be viewed con-
tinuously in any one of four scan modes. CONTINUOUS
scan displays each sensor in turn.
SAFE scan mode displays
CONDITION SAFE and,
upon an alarm condition,
System Security
User identification codes prevent unauthorized users from
changing the configura-
tion and identify those
users who have made
changes. Up to eight
user codes may be as-
Diagnostics
An internal self-diagnostic routine makes over 120 checks
of operating parameters to ensure the system is perform-
ing properly. System performance measurements and key
reference voltages can be accessed and presented at the
A TEST function on the front panel allows testing of the
alarms, system and display. Warning messages on the
alphanumeric display
alert users that a condition
requires attention without
causing a system failure
or interruption.
During calibration Sentry performs a dynamic range check
on every sensor to insure its resolution is sufficient to give
an accurate reading. Sentry avoids false alarms by locking
out sensor alarms during calibration and not allowing ex-
cessive amplification of the signal.
Sierra Monitor Corp. 1991 Tarob Ct., Milpitas, CA 95035, USA, 408-262-6611, 800-727-4377, FAX: 408-262-9042
Web Site: http://www.sierramonitor.com E-Mail: sales@sierramonitor.com
© 2009 by Sierra Monitor Corporation
Sentry Controller
USE ARROWS/ENTER
HIGH ALARM = 20
USE ARROWS/ENTER
ENTRY CODE = 1234
COMB. % LEL
FAST ERROR CHECK
switches automatically to display those sensors in alarm. HIGH-
EST sensor scan will automatically display the sensor record-
ing the highest gas reading - alternately for each gas type. The
user can also SELECT SENSOR displays for a sensor of particu-
lar interest.
Reduced Installation Costs
Multiplexing of digital signals from the sensors to the controller
on a common cable reduces installation cost. Up to eight sen-
sors can be multiplexed on a single cable. Since each sensor
has a unique address, the controller can communicate with the
sensors in turn. Also, with optional external power supplies to
the sensors, two-wire communication with the controller reduces
the installation costs and increases the distance allowed be-
tween the controller and the sensor modules.
CONDITION
[SAFE]
Record Keeping made Easy
Reports can be printed via an optional forty-column printer. There
are six types of reports available.
Status Report – a snap–
shot of gas concentrations
and alarm conditions that
can be pre-set to print hourly,
daily, weekly or on demand.
PRESENT CONFIG.:
STATUS = 07 DAYS
System Report – lists all
the system parameters includ-
ing configuration of the soft-
ware, calibration, printer and
sensor modules.
Key Event Report – prints when any sensor module read-
ing exceeds a pre-set threshold level, which may or may not be
an alarm level. After the module is above the minimum level,
any change greater than a preset, selectable concentration
change will cause another Key Event Report to print.
PRESS ENTER TO:
[SYSTEM REPORT]