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Teledyne GFC-7000T - Trace CO2 Analyzer - manual User Manual

Page 162

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Operating Instructions

Model GFC7000TA Carbon Dioxide Analyzer

Teledyne Analytical Instruments

144

The pin assignments for the Status Outputs are:

Table 6-24: Status Output Pin Assignments

OUTPUT #

Status Definition

Condition

1

SYSTEM OK

On if no faults are present.

2

CONC VALID

On if CO

2

concentration measurement is valid.

If the CO

2

concentration measurement is invalid, this bit is OFF.

3

HIGH RANGE

On if unit is in high range of DUAL or AUTO range modes.

4

ZERO CAL

On whenever the instruments zero point is being calibrated.

5

SPAN CAL

On whenever the instruments span point is being calibrated.

6

DIAG MODE

On whenever the instrument is in diagnostic mode.

7

ALARM1

On whenever the measured CO

2

concentration is above the set point for

ALM1

8

ALARM2

On whenever the measured CO

2

concentration is above the set point for

ALM2

D

EMITTER BUS

The emitters of the transistors on pins 1-8 are bused together.

+

DC POWER

+ 5 VDC

Digital Ground

The ground level from the analyzer’s internal DC power supplies.