Percent Oxygen Analyzer Operation 4
4-17
Teledyne Analytical Instruments
Press
Escape
to re-enter the
Analyze
mode using the fixed range.
NOTE:When performing analysis on a fixed range, if the oxygen
concentration rises above the upper limit (or default value) as
established by the operator for that particular range, the
output saturates at 1 V dc. However, the digital readout and
the RS-232 output continue to read the true value of the oxy-
gen concentration regardless of the analog output range.
4.7 The
AnalyzeFunction
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.
4.8 Signal Output
The standard Model 3000PA Percent Oxygen Analyzer is equipped
with two 0–1 V dc analog output terminals accessible on the back panel (one
concentration and one range ID). The –MA option also has 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
% 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