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Hazardous Area Oxymitter 4000
8-1
OVERVIEW
While the Hazardous Area Oxymitter 4000
electronics provides a significant number of
diagnostic alarms to assist in troubleshooting
potential problems, it's good to place these
alarms in perspective with respect to the
instrument's operating principles:
a. When the Zirconium Oxide sensing cell is
heated to its setpoint [736°C (1357°F)], the
cell will generate a voltage that represents
200
150
100
50
0
0
O
%
100
2
EMF(mV)
-34
O
%
3
2
EMF(mV)
42.3
Figure 8-1. O
Rosemount Analytical Inc. A Division of Emerson Process Management
SECTION 8
TROUBLESHOOTING
O Sensor Performance at 736 C
2
0.01
0.1
Concentration O (%)
20
15
10
1.0
7.25
16.1
2
1
0.8
51.1
66.1
71.0
Sensor mV Reading vs. % O
2
the difference between the process O
and the reference O
(20.95% O
ambient air).
2
b. Test points, Figure 8-1, are provided to read
the raw millivolt value generated by the
ther-mocouple that controls both the cell
temperature and the raw cell signal.
c. The cell temperature at test points 3 and 4
should always be stable at approximately
29 to 30 millivolts, which represents the
736°C setpoint temperature.
1
2
9
8
7
18.4
21.1
23.8
27.2
0.6
0.5
0.4
77.5
81.5
86.3
101.4
at 736°C (Reference Air, 20.9% O
2
Instruction Manual
IB-106-340C Rev. 4.1
July 2004
%
2
% inside the probe
2
O
10
100
37260043
6
5
4
31.2
36.0
0.2
0.1
0.01
116.6
166.8
)
2
Troubleshooting
8
8-1
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