SEKURE SX-3100LCD Manuel de l'opérateur télécharger pdf (Page 367)

GAS ANALYZER 355

7.0 DATA LIST PARAMETER

DESCRIPTION

HYDROCARBONS (HC)

Hydrocarbons (HC) are basically particles of raw, unburned fuel or oil. The most common

cause of excessive HC emissions is misfire due to ignition, fuel delivery, or air induction

problems. Other causes include lean or rich air/fuel mixtures, excessive EGR dilution,

clogged injectors, incorrect ignition timing, low cylinder compression, and intake valve

deposits.

CARBON MONOXIDE (CO)

Carbon monoxide (CO) is a by-product of incomplete combustion and is essentially

partially burned fuel. High CO levels are generally caused by excessively rich air/fuel

mixtures. Common causes of rich mixtures include restricted air cleaner, leaky injectors,

excessively high fuel pressure, and improper closed loop control operation.

CARBON DIOXIDE (CO2)

Carbon dioxide (CO2) is a by-product of efficient and complete air/fuel combustion.

Generally speaking, the higher the CO2 level, the more efficient the engine is operating.

Common causes of low CO2 (decreased combustion efficiency) include air/fuel mixture

imbalances, misfires, and mechanical problems.

OXYGEN (O2)

Oxygen (O2) readings provide a good indication of a lean running engine, since O2

increases dramatically with leaner air/fuel mixtures. Excessively high O2 levels are most

commonly caused by misfires or any condition that causes air/fuel mixtures to be leaner

than stoichiometry (14.7 to 1).

Exhaust oxygen levels on vehicles without secondary air injection (AIR) or with the air

hose pinched off should be low, approximately 1.5% or less. With the AIR on, O2 levels

will be about 3% to 4%. O2 emissions should be stable until the air/fuel ratio shifts leaner

than 14.7:1, then rise quickly. This makes O2 a good indicator of a lean condition.

OXIDES OF NITROGEN (NOX)

Oxides of Nitrogen (NOx), which include both nitrogen monoxide (NO) and nitrogen

dioxide (NO2), are formed when combustion temperatures exceed approximately 2500°F.

Anything that causes combustion temperatures to rise also causes NOx levels to rise.

Common causes of high NOx include cooling system problems, lean air/fuel mixtures,

incorrect O2S operation, improper EGR operation, and incorrect ignition timing.

UNITS RANGE

PPM 0 - 20,000

UNITS RANGE

%0 - 10

WARNING!

CO is a colorless, odorless gas and is poisonous. Lethal

concentrations can result in death. When indoors, always

connect an exhaust ventilation hose to the vehicle tailpipe or

operate in a well ventilated area.

UNITS RANGE

%0 - 20

UNITS RANGE

%0 - 25

UNITS RANGE

PPM 0 - 4,000

1 2 ... 362 363 364 365 366 367 368 369 370 371 372 ... 377 378

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SEKURE SX-3100LCD Manuel de l'opérateur Page 367

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