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Two types of gas sensor modules are available for
the Sentry Gas Risk Management System.  For
the more common gases such as Combustible
Gas, Oxygen, Carbon Monoxide, Hydrogen Sul-
fide, Chlorine and Ammonia, Sierra Monitor offers
the 

IT Series

 Smart Gas Sensor Modules.  More

information on the IT Series is available in the spe-
cific IT Series data sheets.  For other gases Sierra
Monitor offers the 5100 Series Gas Sensor Mod-
ules described in this data sheet.

Sierra Monitor toxic gas sensor modules utilize elec-
trochemical technology to achieve the most accu-
rate and reliable monitoring of gas concentration.
All Sentry 5100 Series sensor modules easily in-
terface to the Sentry controller.  Each module has
a unique address, which allows signals from mul-
tiple modules to be multiplexed for communication
with the controller on the same cable.   All Sierra
Monitor gas sensor modules are designed for hos-
tile or hazardous environments and are in enclo-
sures approved for Div. 1, Class 1, Groups C, D
locations.

SENTRY FEATURES INCLUDE:

Digital Signal Transmission   Serial communication to
the controller enables multiplexing sensor modules on a
signal cable, significantly reducing installation costs.  This
assures RFI and EMI immunity over extended distances.

One-Person, Non-intrusive Calibration   In the calibra-
tion mode, sensors continue to monitor for hazardous
conditions until calibration gas is applied.  All adjustments
are made automatically after calibration gas has been re-
moved.  Sentry notifies the operator of calibration comple-
tion and allows acceptance or rejection of the calibration
at the controller keypad.  There are no manual adjust-
ments required at the sensor module.

Low Sensitivity Check   Automatic, post-calibration
check of sensor for proper output.  Low sensitivity alpha-
numeric message warns of need for sensor maintenance.

Power Up & Calibration Delays    At start-up or calibra-
tion the output of the sensor is locked out and remains
locked for five minutes to avoid erroneous readings during
the warm-up period and after calibration.

Diagnostic Information   The alphanumeric display on
the Sentry Controller provides easy to understand diag-
nostic messages.

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:  [email protected]

© 2009 by Sierra Monitor Corporation

Sentry

Gas Sensor Modules

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