Eurotherm 6100, User Manual

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100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
Page 116 HA029324
Issue 11 Oct 14
4.3.11 FUNCTION (Cont.)
OXYGEN (O2) CORRECTION
This function carries out O
2
correction of gas measurements for use in Continuous Emissions Monitoring
applications. The equation calculated is:
Function
Measured O2
Specified O2
Units
Maths Number
Value
Units
%
Apply Discard
Measured Gas
O2 Correction
Units
Channel 1
0
1) Math 1
0.0000
Channel 2
Figure 4.3.11p Oxygen correction confi guration menu
where,
Specifi ed O
2
= specifi ed oxygen entered as a constant 5-digit value (prescribed for the particular process).
Measured O
2
= measured oxygen,
,
entered as a channel number (gas analyser input) (See application
note, below).
Measured Gas = the measured gas, entered as a channel number (gas analyser input).
APPLICATION NOTE
Some Authorities allow Oxygen correction to be made ONLY if the Measured Oxygen value is above a
limit specifi ed by such Authorities.
For the oxygen correction function to conform with this requirement it is necessary to ‘Filter’ the Meas-
ured Oxygen value using a High Select function, with ‘Measured Oxygen’ and the Specifi ed Limit con-
stant as its inputs. The output from this function (derived channel number) is then used as the ‘Measured
oxygen’ value.
Correction =
20.9% - Specified O
2
20.9% - Measured O
2

Measured Gas