ECA 450 Parts & Service
Instruction 0024-9400
CO-HI Sensor Error – CO-HI sensor was exposed to flue gas during warm-up.
CO-LO Sensor Error – CO sensor was exposed to flue gas during warm-up.
Pressure Sens. Error – Pressure sensor is measuring a pressure that is
outside the of range of ±3 inches of water column during warm-up.
SO2 Sensor Error – SO
2
sensor was exposed to flue gas during warm-up.
Low Battery – Battery voltage is low. Only several minutes of operating time
remain.
5.3 Error Symbols
The following error symbols are shown in the Combustion Test Screen and on
a printout to indicate: 1) combustion test data that cannot be calculated,
2) sensors that are in over-range, or 3) sensors that were detected as being in
error during warm-up.
“– – – –” appears in the number fields of combustion test data that cannot be
calculated because the current measurements will not provide a meaningful
calculation. For example, if the Oxygen level is greater than 16%, or the stack
temperature is greater than 2000 °F (1093 °C), or the ambient air
temperature is greater than 999.9 °F (537.8 °C), then the value for EFF
(combustion efficiency) cannot be calculated.
“x x x x” indicates an over-range condition, and appears in the number fields
of sensors that are being exposed to gas levels that are beyond the analyzer’s
detection range. This symbol also appears in the number field of the HC
sensor when there is not enough Oxygen present to measure the combustible
gas level.
“ ” is displayed in the number fields of sensors that were reported as
being in error during warm-up, and also in the number fields of data that
derive their values from the sensor in error. For example, if the NO or NO
2
sensor was in error, then the NOx data field will also contain stars.
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