UEi Test Instruments SMART BELL - Manual (Page 14)

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“ZeRO” – Analyzer is performing the initial zero setting
CO2 (Carbon Dioxide) – Direct reading of the carbon dioxide sensor displayed in percentage
(%)
Eff (Efficiciency) – Calculated combustion (not appliance) efficiency based on measurements
of CO2, Flue Temperature and fuel selected. The SmartBell calculates gross combustion
efficiency and automatically determines if the combustion is in the condensing mode to make
appropriate corrections.
X-Air (Excess Air) – Excess Air is calculated for each fuel type from the CO2 measure-
ment. It assumes that the combustion process is running fuel lean. It is important to
make other measurements to confirm that this assumption is always correct.
O2 (Oxygen) – O2 is calculated for each fuel type from the CO2 measurement. It
assumes that the combustion process is running fuel lean. It is important to make other
measurements to confirm that this assumption is always correct.
TFlue (Flue Temperature) – TFlue is a direct measurement of the temperature at the tip
of the flue probe. This measurement is used to determine the net temperature for use in
calculation of combustion efficiency.
TNet (Net Temperature) – Differential temperature of Tflue and ambient (or inlet if
set).
BAT symbol - Displays the Battery power available.
Fuels Available
GLOSSARY
12
Selector Position Display Type
L Oil LOIL Light Oil
Propane PrOP Propane
Nat Gas n6AS Natural Gas
H Oil HOIL Heavy Oil
Wood vOOd Wood