3 First steps
18
Parameter Description
Pitot Tube
Factor
The parameter "Pitot tube factor" influences the
measurement of flow speed, volume flow rate and
mass flow. The Pitot factor depends on the type of
Pitot tube used:
Straight Pitot tubes: Factor = 0.67
Prandt’l Pitor tubes (bent): Factor = 1
Humidity The parameter "Humidity" (combustion air humidity)
influences the calculation of qA (flue gas loss) and
flue gas dew point. The factory setting is 80.0%
humidity. To achieve a higher accuracy, the values
can be adjusted to the actual ambient conditions.
Pressure
absolute
The absolute pressure influences the calculation of
flow speed, volume flow, mass flow and flue gas
dew point. The factory setting is 980mbar. To
achieve a higher accuracy, the values can be
adjusted to the actual ambient conditions.
If a CO
2
-(IR) module is installed, the
absolute pressure value measured there will
automatically be used.
Barometric
pressure
The input of the barometric pressure and the
height above sea level is only required when
no absolute pressure is available (no CO
2
IR
module present).
The barometric pressure influences the calculation
of flow speed, volume flow, mass flow and flue gas
dew point. To achieve a higher accuracy, the values
can be adjusted to the actual ambient conditions.
This is 1013mbar as an annual average, regardless
of the altitude. Depending on the current weather,
this pressure can fluctuate by ±20mbar around the
annual average.
Altitude The height above sea level influences the
calculation of flow speed, volume flow, mass flow
and flue gas dew point. To achieve a higher
accuracy, the value can be adjusted to the actual
ambient conditions.
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