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4 Operation Model Ultra Trace 3000
4-22
Teledyne Analytical Instruments
4.8 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
Ana-
lyze
function. Alternatively, you can press the
Analyze
button at any time
to return to analyzing your sample.
4.9 Signal Output
The standard Model Ultra Trace 3000 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.