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
