Trace Oxygen Analyzer Operation 4
4-21
Teledyne Analytical Instruments
L—1 M—10
H—100 Mode—FX/LO
or
L—1 M—10
H—100 Mode—FX/MED
or
L—1 M—10
H—100 Mode—FX/HI
Press Escape to re-enter the Analyze mode using the fixed range.
NOTE: When performing analysis on a fixed range, if the oxygen concentra-
tion rises above the upper limit (or default value) as established by the
operator for that particular range, the output saturates at 1 Vdc (or 20
mA). However, the digital readout and the RS-232 output continue to
read the true value of the oxygen concentration regardless of the
analog output range.
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 3000TA-XL 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 O2, then the output would be:
Voltage Signal Current Signal
ppm O2Output (V dc) Output (mA dc)