Percent Paramagnetic Oxygen Analyzer Part I: Control Unit
Part I: 4-21
Teledyne Analytical Instruments
4.8 Signal Output
The standard Model 3010MB Percent Paramagnetic Oxygen Analyzer
is equipped with two 0-1 V dc analog output terminals accessible on the
interface panel (one concentration and one range ID) and two isolated 4-20
mA dc current outputs (one concentration and one range ID).
See Rear Panel in chapter 3, Installation, for illustration.
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% O2, then the output would be:
Voltage Signal Current Signal
ppm O2Output (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 when
using the 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