Percent Oxygen Analyzer
Operation 4
4-17
Teledyne Analytical Instruments
The signal output for concentration is linear over the currently selected
analysis range. For example, if the analyzer is set on range that was defined
as 0–10 % O
2
, then the output would be:
Voltage Signal
Current Signal
% O
2
Output (V dc)
Output (mA dc)
0
0.0
4.0
1
0.1
5.6
2
0.2
7.2
3
0.3
8.8
4
0.4
10.4
5
0.5
12.0
6
0.6
13.6
7
0.7
15.2
8
0.8
16.8
9
0.9
18.4
10
1.0
20.0
The analog output signal has a voltage which depends on the oxygen
concentration AND the currently activated analysis range. To relate the
signal output to the actual concentration, it is necessary to know what range
the instrument is currently on, especially when the analyzer is in the
autoranging mode.
To provide an indication of the range, a second pair of analog output
terminals are used. They generate a steady preset voltage (or current if you
have current outputs) to represent a particular range. The following table
gives the range ID output for each analysis range:
Range
Voltage (V)
Current (mA)
LO
0.25
8
MED
0.50
12
HI
0.75
16
CAL (0-25%)
1.00
20
