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8.2 Inserting the probe (continued)
Perform the measurement in the core stream of the exhaust gas
channel (probe placed in the hottest gas temperature area). A trend
indication for T.Gas lets you know whether the temperature is in-
creasing or decreasing so that you can find the core stream. As long
as the display shows an up arrow, it means the probe tip is moving
towards the core stream center. If a down arrow is shown, it means
you have moved the probe away from the core stream and the tem-
perature is decreasing. If no temperature change is shown for at
least 3 seconds, the trend indication will disappear.
8.3 Calculations:
CO2, Efficiency, Losses, Excess air, & Dew point
CO
2
, efficiency, losses, excess air and dew point are calculated val-
ues. They can only be calculated if realistic values for the basic pa-
rameters like O
2
and the temperatures are available. In order for the
calculations to appear, the O2 must be below 20.5% and the differ-
ence in gas temp and ambient temp must be at least 5
°:
O
2
< 20.5 %
and
T.Gas - T.Air > + 5 °C
The dew point can only be calculated accurately if, in the menu
"Ad-
justments",
the current barometric air pressure value has been
inputed. If the gas temperature falls below the dew point (between 25
and 65 °C), the efficiency will be calculated with condensation. In this
case a (K) is displayed after „Efficiency“.
8.4 Taking a measurement:
Ramp up, measure, & purge
The analyzer takes a little time to ramp up, which allows for gas
transport time and the build-up of a stable electrochemical reaction
on the sensors. This time period lasts approx. 1 to 1.5 minute. Be
sure to wait until the values are stable. If deviations higher than 2
ppm still occur by the gas values, they can be due to unstable pres-
sure conditions in the exhaust channel.
Summary of Contents for EN2-F
Page 1: ...Version 1 9 2 Operating Instructions ...
Page 2: ...Page 2 ...
