Sierra Monitor Corporation 4101 User Manual
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
single channel package to protect your plant and personnel.
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.
False Alarm Avoidance
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.
Model 4101 Series
Gas Sensor Modules
Convenient Diagnostic Measurements
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.
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
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.
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.
4101-02
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: sierra@sierramonitor.com
4101-04 - 22/27
0504
Gas Sensor Modules
Specifications
Gas T ype Model Sensor Range Units Resolution Response Sensor Operating Range
Time (1) Life (2)
Combustibles 4101-02 Catalytic 0-100 %LEL +/-3% F .S. (3) 3 Yrs -40 to 167 -40 to 75 10 - 95%
Oxygen 4101-03EL EC 0-25 % V ol +/-0.1% <10 sec. 2 Yr 5 to 122 -15 to 50 5 - 99%
Carbon Monoxide 4101-04 EC 0-500 PPM 1.0 PPM <25 sec 2 Yrs -4 to 122 -20 to 50 15 – 90%
Hydrogen Sulfide 4101-05 EC 0-100 PPM 0.1 PPM <30 sec 2 Yrs -40 to 122 -40 to 50 15 – 90%
Chlorine 4101-06 EC 0-10 PPM 0.1 PPM <60 sec 2 Yrs -4 to 122 -20 to 50 15 – 90%
Sulfur Dioxide 4101-10 EC 0-100 PPM 0.5 PPM <20 sec 2 Yrs -4 to 122 -20 to 50 15 – 90%
Nitrogen Dioxide 4101-12 EC 0-20 PPM 0.2 PPM <35 sec 2 Yrs -4 to 122 -20 to 50 15 – 90%
Carbon Monoxide 4 4101-13 EC 0-1000 PP M 0.5 PPM <35 sec 2 Yrs -4 to 122 -20 to 50 15 – 90%
Carbon Monoxide 4101-16 EC 0-2000 PPM 0.1 PPM <35 sec 2 Yrs -4 to 122 -20 to 50 15 – 90%
Nitric Oxide 4101-19 EC 0-20 P PM 0.5 PPM <15 sec 3 Yrs -4 to 122 -20 to 50 15 – 90%
Hydrogen Chloride 4101-21 EC 0-20 PPM 0.1 PPM <100 sec 2 Yrs -4 to 122 -20 to 50 15 – 90%
Hydrogen Cyanide 4101-22 EC 0-20 PPM 0.1 PPM <70 sec 2 Yrs -4 to 122 -20 to 50 15 – 90%
Ammonia 4101-25 EC 0-50 P PM 1.0 PPM <30 sec (5) 14 to 113 -10 to 45 20 – 95%
Hydrogen Fluoride 4101-26 EC 0-10 PP M 1.0 PPM <30 sec (5) 14 to 113 -10 to 45 20 – 95%
Ethylene Oxide 4101-27 EC 0-20 PP M 0.1 PPM <90 sec 2 Yrs -4 to 122 -20 to 50 15 – 90%
Notes: (1) Response time to 90% full signal value for applied concentration
(2) Sensor life typical for use at standard temperature and pressure with occasional exposure to gas of interest
(3) Step to 50% LEL within 10 seconds. Recovery to 10% LEL within 30 seconds
(4) Hydrogen tolerent
(5) Diffusion via membrane. Requires electrolyte and membrane replacement every 6 months.
o
o
F
C RH
Electrical Data
Loop Type 3 wire
Loop Resistance 800 Ohm with 28VDC
400 Ohms at 21 VDC (4101-02)
Input Voltage DC 14-30 VDC (20-30VDC 4101-02)
Input Current 40 mA (80 mA 4101-02)
Input Power Max 1.4W (2.3W 4101-02)
Signal Output 4-20 mA DC linear (trouble 0 mA)
Operating Pressure +10% (variation from ambient)
Construction
Modules Dimensions Weight
4101-02 H: 7.5", D: 4.0", W: 4.0" 2.0 lb
(21.6 x 10.2 x 10.2 cm) (0.9 Kg)
4101-03EL H: 8.5", D: 4.0", W: 4.0" 2.1 lb
(21.6 x 10.2 x 10.2 cm) (1.0 Kg)
4101-04-27 H: 8.0", D: 4.5", W: 4.0" 2.7 lb
(20.3 x 15.2 x 15.2 cm) (1.3 Kg)
4101-25/26 H: 10.2", D: 6.0", W: 6.0" 2.7 lb
(25.9 x 15.2 x 15.2 cm) (1.3 Kg)
Cross Sensitivity Data
Model Gas Reading from 100 PPM of interfering gas
Number type CO H2SCl2H
4101-04 CO 100 5 0 <20 00600<50
4101-05 H2S <2 100 -20 <0.1 <15 -15 0 0 0 0
4101-06 Cl
4101-10 SO
4101-12 NO
4101-13 CO 100 350 0 <60 60 - 6 0 25 0 0 <75
4101-16 CO 100 0000000035
4101-19 NO 0 35 0 0 5 25 100 15 0 0
4101-21 HCl 0 75 -10 0 35 -2 0 100 - 8 0
4101-22 HCN <0.5 -50 0 160 -190 -5 100 <1
4101-27 C2H4O Ethanol 55
2
2
2
(ETO) T oluene 20
0 <-10 100 0 0 105 0 0 0 0
<1 0 -40 0 100 -100 0 0 15 0
0-20900010000-30
Methyl-ethyl-ketone 10
Carbon Monoxide 40
4101-02 Combustible Gas Sensor
2
SO
NO
2
2
is FM Approved
NO HCl HCN C2H
4
05/04
Sierra Monitor Corp. 1991 T arob Ct., Milpitas, CA 95035, USA, 408-262-6611, 800-727-4377, F AX: 408-262-9042
Web Site: http://www.sierramonitor.com E-Mail: sierra@sierramonitor.com
© 2004 by Sierra Monitor Corporation
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