Teledyne GFC 7001EM Analog Output Ranges for CO Concentration, Analog Output Connector Pin Out

Basic Operation Model GFC7001E Carbon Dioxide Analyzer

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).

ANALOG OUT

	CO concentration				Only active if the Optional
	outputs				CO2 or O2 Sensor is
						Test Channel
	A1		A2	A3	A4
+		- + -		+ -	+ -

LOW range when DUAL	HIGH range when DUAL
mode is selected	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 CO2 or O2 sensor option is installed. In this case a signal representing the currently measured CO2 or O2 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.

Teledyne Analytical Instruments 98