Teledyne GFC 7001E User Manual download pdf (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

or O

Sensor is

NALOG 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

or O

sensor option is installed. In this case a signal representing the

currently measured CO

or O

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.

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Teledyne GFC 7001E User Manual Page 98