Teledyne gfc 7000ta operation manual Setup  More  Vars Internal Variables Vars

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer

6.12. SETUP  MORE  VARS: Internal Variables (VARS)

The GFC 7000TA has several-user adjustable software variables, which define certain operational parameters. Usually, these variables are automatically set by the instrument’s firmware, but can be manually re-defined using the VARS menu. Table 6-14 lists all variables that are available within the 818 password protected level.

	Table 6-14: Variable Names (VARS) Revision B.3
NO.	VARIABLE	DESCRIPTION	ALLOWED
			VALUES
		Changes the internal data acquisition system (DAS) hold-off
		time, which is the duration when data are not stored in the	Can be between 0.5
		DAS because the software considers the data to be
0	DAS_HOLD_OFF		and 20 minutes
		questionable. That is the case during warm-up or just after
		the instrument returns from one of its calibration modes to	Default=15 min.
		SAMPLE mode. DAS_HOLD_OFF can be disabled entirely
		in each DAS channel.
1	CONC_PRECISION	Allows the user to set the number of significant digits to the	AUTO, 1, 2, 3, 4
		right of the decimal point display of concentration and
			Default=AUTO
		stability values.
2	STABIL_GAS	Selects which gas measurement is displayed when the STABIL	CO2 & O21
		test function is selected.
3	DYN_ZERO	Dynamic zero automatically adjusts offset and slope of the
		CO2 response when performing a zero point calibration	ON/OFF
		during an AutoCal (Section 7).
		Dynamic span automatically adjusts slope and slope of the
		CO2 response when performing a zero point calibration
4	DYN_SPAN	during an AutoCal (Section 7).	ON/OFF
		Note that the DYN_ZERO and DYN_SPAN features are not
		allowed for applications requiring EPA equivalency.
5	CLOCK_ADJ	Adjusts the speed of the analyzer’s clock. Choose the +
		sign if the clock is too slow, choose the - sign if the clock is	-60 to +60 s/day
		too fast.

1O2 option is only available in analyzers with O2 sensor options installed.

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