Teledyne 3000TA - General purpose trace oxygen analyzer - Manual (Page 53)

Trace Oxygen Analyzer Operation 4
4-21 Teledyne Analytical Instruments
lyze function. Alternatively, you can press the Analyze button at any time
to return to analyzing your sample.
4.8 Signal Output
The standard Model 3000TA Trace Oxygen Analyzer is equipped with
two 0–1 V dc analog output terminals accessible on the back 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 0–100 ppm O
2
, then the output would be:
Voltage Signal Current Signal
ppm O
2
Output (V dc) Output (mA dc)
0 0.0 4.0
10 0.1 5.6
20 0.2 7.2
30 0.3 8.8
40 0.4 10.4
50 0.5 12.0
60 0.6 13.6
70 0.7 15.2
80 0.8 16.8
90 0.9 18.4
100 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: