Sierra Monitor 5000 User Manual
The Sentry controller is the heart of the Sentry Gas Risk
Management system. It is a microprocessor based system that performs functions including management of the
sensor modules, management of alarm relays and interface with the user via the front panel display , printer output, Modbus digital communication, alarm indicators and
relay outputs.
Sentry system two-way communication between the sensors and the controller results in the capability to perform
one-person calibration and diagnostic checks from the
controller. The user-friendly front panel includes a large
display of the gas concentration and sensor number. V arious scan modes are available to meet the user’s specific
monitoring needs. A separate 2-line alphanumeric display provides more detailed information including sensor
data, error messages and menu prompting for calibration
and set-up.
Sentry
Controller
A series of alarm LEDs instantly inform the user of alarm
status on any of the eight sensors interfaced to the controller. These LEDs are solid for low alarm and flashing for
high alarm. A trouble LED warns that one of 120 diagnostic checks has detected a problem. More information about
the trouble will be displayed on the alphanumeric display .
A calibrate/change LED indicates that calibration or con-
figuration change is being performed on at least one sensor. The remaining sensors will remain on-line providing
continuous protection.
The Sentry keypad, together with the user-friendly menu
on the alphanumeric display , guides the user through setup, calibration and maintenance of the Sentry system.
Sierra Monitor Corp. 1991 T arob Ct., Milpitas, CA 95035, USA, 408-262-661 1, 800-727-4377, F AX: 408-262-9042
Web Site: http://www.sierramonitor.com E-Mail: sales@sierramonitor.com
© 2009 by Sierra Monitor Corporation
FEATURES AND BENEFITS
Sentry Controller
Gas Risk Management is the key design philosophy behind 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 requirements.
Menu Prompting
Menu prompting guides the user through system configuration and operation.
Prompting, via the alphanumeric 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 .
USE ARROWS/ENTER
HIGH ALARM = 20
System Security
User identification codes prevent unauthorized users from
changing the configuration and identify those
users who have made
changes. Up to eight
user codes may be as-
USE ARROWS/ENTER
ENTRY CODE = 1234
Diagnostics
An internal self-diagnostic routine makes over 120 checks
of operating parameters to ensure the system is performing properly. System performance measurements and key
reference voltages can be accessed and presented at the
switches automatically to display those sensors in alarm. HIGH-
EST sensor scan will automatically display the sensor recording 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 sensors 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 between the controller and the sensor modules.
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 excessive amplification of the signal.
COMB. % LEL
FAST ERROR CHECK
Sensor Scan Display
Current sensor gas exposure readings can be viewed continuously 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,
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 .:
ST A TUS = 07 DA YS
System Report – lists all
the system parameters including configuration of the software, calibration, printer and
sensor modules.
PRESS ENTER TO:
[SYSTEM REPORT]
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.
Sierra Monitor Corp. 1991 T arob Ct., Milpitas, CA 95035, USA, 408-262-661 1, 800-727-4377, F AX: 408-262-9042
Web Site: http://www.sierramonitor.com E-Mail: sales@sierramonitor.com
© 2009 by Sierra Monitor Corporation
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