Sierra Monitor Corporation Carbon Monoxide Alarm 4101 User Manual

Model 4101 Series  
Gas Sensor Modules  
The Model 4101 Series Gas Sensor Modules  
feature accurate detection of the specified  
gas with linear 4-20 mA output.  
The Sierra Monitor Model 4101 Series provides the user  
with the features needed in a stand-alone, fixed-point  
hazardous gas monitor system. Utilizing catalytic bead  
sensor for combustible gas and electrochemical sensor  
technology for the oxygen and toxic gas sensors, the Model  
4101 provides accurate monitoring of hazardous gas  
conditions. Proven sensor design matched with reliable  
state-of-the-art electronics results in the ideal complete Convenient Diagnostic Measurements  
single channel package to protect your plant and personnel.  
Critical measurements are made at convenient jacks for a  
Volt Ohm Meter. Each measurement location is clearly  
marked. All modules have a signal output adjustment.  
Automatic Low Sensitivity Check  
Monitoring integrity is ensured with the automatic low  
sensitivity check. After calibration, a sensor sensivity  
check confirms that the sensor response to gas is sufficient  
to provide reliable operation without false indication. If the  
sensor has low sensitivity, an LED lights to indicate that  
sensor replacement is due.  
Simple Zero and Span Adjustments  
Easily accessible potentiometers enable calibration  
adjustments to be made in minutes by non-technical  
personnel for reduced maintenance cost.  
Flexible Alarm and Logging Options  
False Alarm Avoidance  
The analog gas sensor modules can be used as part of a  
facility gas risk management plan. The 4-20 mA output  
signal is ideally suited to interface with a wide range of  
instrumentation for alarm annunciation and recording.  
During Power-Up and Calibration, the transmitter output is  
locked at 4 mA (except Oxygen sensor modules). The  
output remains locked for five minutes directly after power  
is applied or after calibration gas is removed, allowing  
sufficient time to fully stabilize before coming on-line. This  
avoids erroneous readings during warm-up and prevents  
alarm caused by calibration gas.  
The sensor module is housed in a NEMA-7 enclosure rated  
for Class 1, Division 1, Groups C, D environments. An  
optional NEMA 4 Group B enclosure is available.  
4101-04 - 22/27  
4101-02  
Sierra Monitor Corp. 1991 Tarob Ct., Milpitas, CA 95035, USA, 408-262-6611, 800-727-4377, FAX: 408-262-9042  
0504  
 

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