Toxalert GVU-CO2 User Manual
TM
DATA
TOXALERT
SHEET
CARBON DIOXIDE (CO2) MODEL GVU-CO
DIESEL EXHAUST GAS DETECTOR
TYPICAL INSTALLATIONS:
• Parking Garages • Vehicle Maintenance & Storage
• Bus Garages Highway Departments
• Fire Stations Utilities
• Warehouses Public Works
• Car Dealers • Tunnels
GENERAL DESCRIPTION:
The model GVU-CO2 Carbon dioxide sensor is designed to interface
with a Toxalert Int’l model GVU series control unit. The sensor/transducer consists of a patented solid state infrared CO
an attractive plastic case. The GVU-CO
lithium tantalate detector, updated electronics and unique auto-zero
function. This results in very stable calibration and longer trouble-free
operation in the field. The new IR source is more rugged, operated at
10X derated power and has a life expectancy of 10 years. The new lithium
tantalate detector enhances stability, has less ambient temperature sensitivity and faster response time. The GVU-CO
+
_
2000 ppm with a repeatability of
allow free passage of air to the sensing cell inside.
20 ppm. The enclosure has louvers to
has a new state-of-the-art
2
monitor housed in
2
has a range of 0 to
2
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Model GVU-CO
FEATURES:
• Microprocessor based
• Power on indication
• 10 year sensing element life
• One calibration gas instead of two
• State-of-the art Infrared Security
• High CO2 indication
• Low voltage class two (2) wiring
• Operating range meets OSHA standard
TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 (952) 472-4541 FAX (952) 472-4960
Visit our website at www. toxalert. com
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BACKGROUND:
The composition of diesel exhaust gases vary with the type of engine and with the rate of operation of
these diesel engines. The prominent noxious gases of diesel engines are NOX [which is made up of NO
(nitric oxide) and NO
(sulfates).
SO
4
Carbon monoxide (CO) sensors do a good job of detecting gasoline engine exhaust fumes, but because
diesel engines output a smaller amount of carbon monoxide, (less than 1%) CO detection is not recommended for sensing diesel exhaust. There are no stable, inexpensive, or easy to maintain sensors for
sensing nitric oxide or nitrogen dioxide which are the poisonous and the dominant diesel exhaust emissions. An investigation R18884*, done by the U.S. Department of Interior, Bureau of Mines shows that
the carbon dioxide (CO
exhaust.
(nitrogen dioxide)], followed by CO (carbon monoxide), SO2 (sulfer dioxide) and
2
) in diesel exhaust is relative to all the noxious gases contained within the diesel
2
The Bureau report states “CO
of the pollutants,” (13%). It further states “CO
is present in the diesel exhaust gases in the highest concentration of any
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is the only stable and nonreactive pollutant in the ex-
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haust that is unaffected, to any appreciable extent, by time, emission control devices, or engine wear.” For
these reasons CO
is chosen to be the surrogate gas to be sensed to indicate dangerous levels of the
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noxious gases contained in diesel exhaust.
The report “established an estimate level of CO
are considered below harmful levels.” The 0.133 percent would be equivalent to 1330 ppm of CO
fore if the CO
in environments where diesel exhaust is present is kept at or below 1300 ppm, a safe
2
–0.133 pct (percent) at which the other diesel pollutants
2
. There-
2
environment will be maintained.
* Report of Investigation 8884:
Diesels in Underground Mining, A review and an Evaluation of an Air
Quality Monitoring Methodology by J. Harrison Daniel, Jr., Staff Engineer, Division of Health & Safety,
Bureau of Mines, Washington, D.C.
SPECIFICATIONS
•
Operating principle: Non Dispersive Infrared
• Gas sampling method: Diffusion
• Range: 0 to 2000 ppm
• Response time: Less than 1 minute
• Operating temperature range: 32ºF to 122ºF
(0ºC to 50ºC)
• Operating humidity: 0-90% RH (non condensing)
• Dimension: 5.2” x 3.2” x 1.4”
• Weight: .5 lbs. (.35 kg)
• Accuracy: + 5% of reading or + 75 ppm, which ever is
greater
• Repeatability: + 20 ppm
• Typical Drift (per year): + 75 ppm ( @1200 ppm)
• Storage temperature: -22ºF to 140ºF
• Input power: 20-30 VAC (provided from GVU
Control unit)
• Power Consumption: Less than 2W @24VAC
__
_
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(-30ºC to 60ºC)
TOXALERT INTERNATIONAL, INC., P.O. BOX 159, MOUND, MINNESOTA 55364 (952) 472-4541 FAX (952) 472-4960
Visit our website at www. toxalert. com
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