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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 se-
lected 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
To provide an indication of the range, the Range ID analog output
Figure 3-: Analog Output Connections
Examples:
Percent
Voltage Signal Current 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
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-
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