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SENSORS
Electrochemical
Electrochemical sensors are fuel cell-like devices consist-
ing of an anode, cathode, and electrolyte. The compo-
nents of the cell are se-
lected so a subject gas
allowed to diffuse into the
cell will cause a chemical
reaction and generate a
current. The cells are dif-
fusion limited, so the rate
at which the gas enters
the cell is solely depen-
dent on the gas concentration. The current generated is
proportional to the rate of consumption of gas in the cell.
Unlike other electrochemical sensors where gas diffuses
through membranes into the cell, Sierra Monitor sensors
allow gas to diffuse into the sensor through a simple cap-
illary. The result is an extremely stable sensor with very
low temperature and pressure coefficients.
Common Specifications for All 5100 Series Sensors
Zero Drift: Less than 5% per year
Calibration Frequency: 90 Days Recommended
Transmission: Digital – RFI, EMI immune
Warranty: 2 years
Housing: Explosion proof (NEMA 7)
(Div. 1, Class 1, Groups C,D)
Optional upgrade to Group B,
NEMA 4X
Dimension: 7.6 X 4.6 X 4.2 inches
(19.3 X 11.7 X 10.7 cm)
Note that 5100-26 is larger
Weight: 2.7 lb. (1.3 Kg)
Note 1: Diffusion via membrane
GAS SENSOR SPECIFICATIONS
Gas Model Sensor Range Time Sensor Operating Relative
Number Type Response Life Temperature Humidity
Hydrogen 5100-07 Electrochem 0-1,000 PPM 90% <30 sec. 2 yr. 4
o
to 122
o
F (-20
o
to 50
o
C) 15-99% RH
Sulfur Dioxide 5100-10 Electrochem 0-100 PPM 90% <20 sec. 2 yr. 4
o
to 122
o
F (-20
o
to 50
o
C) 15-99% RH
Nitrogen Dioxide 5100-12 Electrochem 0-20 PPM 90% <35 sec. 2 yr. 4
o
to 122
o
F (-20
o
to 50
o
C) 15-99% RH
Carbon Monoxide 5100-13 Electrochem 0-1,000 PPM 90% <25 sec. 3 yr. 4
o
to 122
o
F (-20
o
to 50
o
C) 15-99% RH
Carbon Monoxide 5100-16 Electrochem 0-2,000 PPM 90% <35 sec. 2 yr. 4
o
to 122
o
F (-20
o
to 50
o
C) 15-99% RH
(Hydrogen Tolerant to
2,000 PPM H2)
Nitric Oxide 5100-19 Electrochem 0-20 PPM 90% <15 sec. 3 yr. 4
o
to 122
o
F (-20
o
to 50
o
C) 15-99% RH
Hydrogen Chloride 5100-21 Electrochem 0-20 PPM 90% <100 sec.2 yr. 4
o
to 122
o
F (-20
o
to 50
o
C) 15-99% RH
Hydrogen Cyanide 5100-22 Electrochem 0-20 PPM 90% <70 sec. 2 yr. 4
o
to 122
o
F (-20
o
to 50
o
C) 15-99% RH
Hydrogen Fluoride 5100-26 Electrochem
1
0-10 PPM 90% <30 sec. 1 yr. 14
o
to 113
o
F(-10
o
to 45
o
C) 20-95% RH
Ethylene Oxide 5100-27 Electrochem 0-20 PPM 90% <90 sec. 2 yr. 4
o
to 122
o
F (-20
o
to 50
o
C) 15-99% RH
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: sales@sierramonitor.com
© 2009 by Sierra Monitor Corporation
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