Teledyne 3000TA-XLEU - Trace oxygen analyzer - Manual (Page 76)

Operation 3000TA-XL-EU
Teledyne Analytical Instruments 60
4.9 Signal Output
The standard Model 3000TA-XL-EU 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:
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
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