Teledyne 3000ZA - Trace oxygen analyzer - Manual (Page 61)

Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 49
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.
4.7 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 3000ZA 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 connection details.
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:
Table 4-1: Output Signals
Voltage Signal Current Signal
ppm O2 Output (VDC) 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