4 Technical Description
39
4.12.3 Calculation of the concentration of CO
2
, calculated for the specific fuel on the basis of the
measured O
2
value and the max. CO
2
value Type 6 57 R 0910
The calculation takes place according to the following formula:
CO
2
= CO
2
max – (21 % -O
2
/ 21%)
The calculation is based on the following maximum CO
2
contents at λ = 1 = O
2
= 0 vol.
% with dry exhaust gas
Fuel oil EL 15.4 vol. %
Natural gas H 12.0 vol. %
Fuel oil S 15.9 vol. %
Natural gas L 11.7 vol. %
CO
2
max can be preset individually via the parameters 846, 862, 878 and 894.
Output via analogue output 3:
0...20% CO2 = 4...20mA
4.12.4 Load-dependent, fuel-specific limit curves (optional extra) Type 6 57 R 0920
The load rating (burner load) or another measured variable is activated via analogue
input 4 or the LAMTEC SYSTEM BUS. Instead of fixed limit values, fuel-specific
curves with two to maximum 18 interpolation points can be entered.
Limit curves (factory setting) parameterised to undershoot, or alternatively
two fuels with four limit curves each/two limit values per fuel
4.12.5 Integrated PID/O
2
controller Type 6 57R1120
See separate manual DLT4002.
4.12.6 Output of internal load via analogue output (only in conjunction with ETAMATIC/FMS/VMS)
Type 6 57 R 1124
Forwarding of internal load via current input or LAMTEC SYSTEM BUS.
0...1000digits load Æ 0/4...20mA
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