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Troubleshooting 71
6
888Xi Advanced Electronics Instruction Manual Section 4: Troubleshooting
PN 51-6888Xi December 2012
Section 4: Troubleshooting
4.1 Overview
When the Zirconium Oxide sensing cell is heated to its setpoint [736°C (1357°F)], the cell will
generate a voltage that represents the difference between the process O
2
% and the reference
O
2
% inside the probe (20.95% O
2
instrument or ambient air).
When flowing calibration gases, the raw cell millivolt value should represent the levels on the
chart in Figure 4 -1. Note that the raw cell millivolt value increases logrithmically as the O
2
con-
centration decreases.
FIGURE 4-1. O
2
Sensor mV Reading vs %O
2
at 736°C (1357°F) (Reference Air, 20.95% O
2
)
120
100
80
60
40
20
0
EMF (mV)
0 5 10 15 20
c(O
2
)(%)