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10.4 LSB Module for Calculating Combustion Efficiency
10.4.1 Functional Description
Properties:
• Two Pt100 temperature inputs to record the flue gas temperature and inlet temperature
• Two analogue outputs 0/4 ... 20 mA to emit the flue gas temperature and its efficiency
• Power supply 24 VDC / 50 mA (PELV)
NOTICE
All outgoing lines from the LSB module must be screened. The screens must be applied to the
PE rail as short as possible.
Description of function
The calculation takes place according to the following formula:
n
F
= 100 (q
Af
+ q
Ag
) %
q
Af
= flue gas loss due to free heat
q
Ag
= flue gas loss due to bound heat
q
Af
= ( t
A
- t
L
) * [A
2
/ 21 – O
2
+ B]
The calculation of the flue gas losses is based on the following mean fuel values:
Oil A
2
= 0.68; B = 0.007
Gas A
2
= 0.66; B = 0.009
It is assumed that the combustion takes place free of CO and soot. The flue gas losses due
to bound heat q
Ag
are not taken into consideration.
Function not effective until < 14.9 vol. % O
2
.
Display:
NOTICE
The termination resistor (120 ) must be installed and activated on the first and the last BUS
device.
Avoid transmission line!
The terminal resistance can be set via DIP switch 1.
ETA efficiency 0 ... 100%
T-ex flue gas temperature 0 ... 400 °C
T air inlet air temperature 0 ... 400 °C
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