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Operation 3000TA- EU
Teledyne Analytical Instruments 54
4.7 The Analyze Function
Normally, all of the functions automatically switch back to the
Analyze function when they have completed their assigned operations.
Pressing the Escape button in many cases also switches the analyzer
back to the Analyze 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 VDC 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:
ppm O
2
Voltage Signal
Output (VDC)
Current Signal
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