- 31 -
(Ta)
temperature calculation if an INLET probe is not fitted.
CO/CO2 R :
The CO/CO2 ratio, is the ratio of measured CO divided by calculated CO2.
It gives an indication of the following :-
•
How good a gas sample the instrument is reading.
•
How clean the boiler is running.
For example : A new or clean domestic boiler will display a ratio of less
than 0.004, a unit in need of cleaning 0.004-0.008 and a unit in need of
major overhaul will show greater than 0.008.
This only shows a reading when a combustion test is being carried out. ‘- -’
is displayed while in clean ambient air.
P INDEX :
The CO/CO2 ratio expressed as a percentage %, called the ‘Poison
(PI)
Index’ i.e. P INDEX % = 100 x CO/CO2. ‘- -’ is displayed while in
clean ambient air.
XAIR % :
Excess air calculated from the measured oxygen and type of fuel
(
λ
)
used. During a combustion test ‘O2 > 20%’ will be displayed while
in
clean ambient air.
Prs :
Flue draught pressure reading. Displayed when pressure sensor fitted. See
UNITS menu 5.2.3. for scales.
NO:
Nitric Oxide reading in ppm or mg/m3. Displayed when Nitric Oxide sensor
fitted. Also displayed as
NO (n)
when referenced to oxygen. The display
will read ‘O2 > 20%’ if referenced values selected and instrument is in
clean ambient air.
NOx :
Calculated total Nitric oxides displayed in ppm or mg/m3. Where NOx =
NO + P%NO, note P can be set from 0-9%, default = 5%. See SELECT
menu 5.2.2. Also displayed as
NOx (n)
referenced to oxygen. The display
will read ‘O2 > 20%’ if referenced values are selected and instrument is
sampling clean ambient air.
SO2 :
Sulphur Dioxide reading in ppm or mg/m3. Displayed when Sulphur
Dioxide sensor fitted. Also displayed as
SO2 (n)
referenced to oxygen. The
display will read ‘O2 > 20%’ if referenced values selected and instrument is
in clean ambient air.
O2 ref % :
Toxic gas measurements can be referenced to defined oxygen levels.
(O2r)
See SELECT menu 5.2.2 for details.
Содержание KM940
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