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Thermal Conductivity Analyzer
The analog output signal has a voltage which depends on gas concen-
tration relative to the full scale of the 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.
The signal output for concentration is linear over the currently selected
analysis range. For example, if the analyzer is set on a range that was defined
as 0–10 % hydrogen, then the output would be as shown in Table 3-1.
Table 3-1: Analog Concentration Output—Example
Figure 3-4: Analog Output Connections
Examples:
Percent
Voltage Signal
Hydrogen
Output (V dc)
0
0.0
1
0.1
2
0.2
3
0.3
4
0.4
5
0.5
6
0.6
7
0.7
8
0.8
9
0.9
10
1.0
(Continued)
Teledyne Analytical Instruments
Part I: Control Unit
Current Signal
Output (mA dc)
4.0
5.6
7.2
8.8
10.4
12.0
13.6
15.2
16.8
18.4
20.0
Part I 3-5
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