Teledyne gfc 7000ta operation manual Setup  Rnge Analog Output Reporting Range Configuration

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer

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.

ANALOG OUT

	CO2 concentration				Test Channel
	outputs
						Not Used
	A1		A2	A3	A4
+ -		+ -		+ -	+ -

LOW range when DUAL	HIGH range when DUAL
mode is selected	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 CO2 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,

6.8.4and 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 O2 sensor option is installed. In this case a signal representing the currently measured O2 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 <TST TST> keys of the units sample display.

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