Teledyne GFC-7000T - Trace CO2 Analyzer - manual User Manual
Page 107
Operating Instructions
Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments
89
6.8. SETUP
RNGE: Analog Output Reporting Range
Configuration
The analyzer has three active analog output signals, accessible through a connector on the rear panel.
Test Channel
ANALOG OUT
A1 A2 A3 A4
+ - + - + - + -
CO
2
concentration
outputs
HIGH range when DUAL
mode is selected
Not Used
LOW range when DUAL
mode is selected
Figure 6-6:
Analog Output Connector Pin Out
All three 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 and A2 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 data logger (See Section 6.13.4).
The A1 and A2 channels output a signal that is proportional to the CO
2
concentration of the sample gas.
Several modes are available which allow them to operate independently or be slaved together (See
Section 6.7). The user may also select between a variety of reporting range spans (See Sections 6.8.3,
6.8.4 and 6.8.5).
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 O
2
sensor option is installed. In this case a signal representing the
currently measured O
2
concentration is output on this channel.
The output, labeled A4 is special. It can be set by the user (See Section 6.13.9) to output several of the
test functions accessible through the