Teledyne GFC-7001E - Trace CO Analyzer - Manual (Page 98)

Basic Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 98
6.6.2. ANALOG OUTPUT RANGES FOR CO CONCENTRATION
The analyzer has several active analog output signals related accessible through a connector on the rear panel
(see Figure 3-2).
Only active if the Optional
CO
2
or O
2
Sensor is
ANALOG OUT
A1 A2 A3 A4
+ - + - + - + -
CO concentration
outputs
HIGH range when DUAL
mode is selected
Test Channel
LOW range when DUAL
mode is selected
Figure 6-4: Analog Output Connector Pin Out
All four outputs can be configured either at the factory or by the user for full scale outputs of 0.1 VDC, 1VDC,
5VDC or 10VDC.
Additionally A1, A2 and A3 may be equipped with optional 0-20 mADC current loop drivers and configured for
any current output within that range (e.g. 0-20, 2-20, 4-20, etc.). The user may also adjust the signal level and
scaling of the actual output voltage or current to match the input requirements of the recorder or datalogger (See
Section 7.4.5).
The A1 and A2 channels output a signal that is proportional to the CO concentration of the sample gas. Several
modes are available which allow them to operate independently or be slaved together (See Section 6.6.3).
EXAMPLE:
A1 OUTPUT: Output Signal = 0-5 VDC representing 0-1000 ppm concentration values
A2 OUTPUT: Output Signal = 0 – 10 VDC representing 0-500 ppm concentration values.
Output A3 is only active if the CO
2
or O
2
sensor option is installed. In this case a signal representing the
currently measured CO
2
or O
2
concentration is output on this channel.
The output, labeled A4 is special. It can be set by the user (See Section 7.4.6) to output several of the test
functions accessible through the <TST TST> keys of the units sample display.