UEi Test Instruments KM940 - Manual (Page 18)

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Calculation of fuel constants are detailed in the Appendix. Fuel constants will
have to be calculated before a user fuel can be entered.
To enter the user fuel select ‘User Fuel’ and Press
USER FUEL
K1g
K_2
K_4 : 0.000
: 0.00
: 00
K1n
K_3
O2r : 0.000
: 0.00
: 00
Use and to select the correct value.
USER FUEL
K1g
K_2
K_4 : 0.350
: 0.00
: 0
K1n
K_3
O2r : 0.000
: 0.00
: 00
Use to move to the next parameter, repeat above until all parameters
are correct. Press to return to SELECT menu.
O2 Ref :
Toxic gas measurements can be referenced to defined oxygen levels. Reference
values can be set from 1-20%, to AUTO or more normally to the default value
- OFF. Setting to AUTO uses the figure in the FUEL constants data.
Oxygen referencing is required by some regulations such as TA-LUFT. If a
reference value is selected then toxic gas measurements will be displayed with
the symbol (n) attached to the reading. i.e. CO(n)
What does Oxygen reference mean ?
If 3 % O
2
reference is selected and 5 % O
2
is measured in the flue then toxic
gas values will be recalculated as if 3 % were measured. The equation for
referencing is detailed in the Appendix.
Oxygen referencing prevents false readings being submitted, e.g. allowing
more air into the boiler will increase the oxygen level in the flue and hence
dilute any toxic gas reading. Oxygen referencing gives readings as if they were
undiluted.
SMOKE:
Allows the user to enter a smoke test number from 0-9. This value will be
printed on the standard printout. Default value is OFF.
RESET : Allows
the user set the Oxygen to 20.9% and zero the toxic sensors without
turning the analyser off.