Instruction 0024-9435
26
Fyrite Tech
4.8.9 Sensor Error Screen
An O
2
sensor error is displayed if the analyzer determines during the
warm-up cycle that the oxygen sensor’s output is too low for it to be usable.
However, in the extreme condition when the O
2
sensor has
no output
, a sen-
sor error will not occur. Instead, the O
2
reading will be 0.0 as displayed in
the O
2
Screen (Model 50) or the CO & O
2
Screen (Model 60).
When the CO channel (Model 60 only) is set up for Auto Zero (refer to
Sec tion 3.5.3), a CO sensor error will occur if the detected carbon monox-
ide level is above 50 ppm during the warm-up cycle. Note that if the CO
chan nel is set up for manual calibration, the analyzer does not auto-zero
the CO sensor during warm-up, and thus does not generate a CO sensor
error when the analyzer is turned ON in an atmosphere containing a high
back ground level of CO.
Do the following before replacing a suspected spent or defective sensor:
1. Turn OFF the analyzer and turn it back ON in an area of fresh air
(con tain ing 20.9% O
2
and no CO).
2. Perform the Oxygen Sensor Zero procedure (Section 5.4) and, if ap-
plicable, the CO Sensor Zero & Calibration procedure (Sec tion 5.5).
3. If Steps 1 & 2 do not eliminate the error condition, re place sensor(s)
(refer to Sections 5.7 or 5.8).