Teledyne gfc 7000ta operation manual Test Functions Defined, Parameter Display Units Meaning

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer

6.2.1. Test Functions

Test functions are shown on the front panel display while the analyzer is in SAMPLE mode. They provide information about the present operating status of the instrument and can be used troubleshooting and can be recorded in one of the DAS channels (Section 6.7) for data analysis. To view, press the <TST TST> buttons.

Table 6-2: Test Functions Defined

PARAMETER	DISPLAY	UNITS	MEANING
Range	RANGE	PPB, PPM,	The full scale limit at which the reporting range of the analyzer is
	RANGE11		currently set. THIS IS NOT the Physical Range of the instrument.
		UGM, MGM
	RANGE21		See Section 6.8.1 for more information.
O2 Range	O2 RANGE	%	The range setting for the O2 Sensor
Stability	STABIL	PPB, PPM	Standard deviation of CO2 concentration readings. Data points are
		UGM, MGM	recorded every ten seconds using the last 25 data points.
CO2 Measure	MEAS	MV	The demodulated, peak IR detector output during the measure
			portion of the GFC Wheel cycle.
CO2 Reference	REF	MV	The demodulated, peak IR detector output during the reference
			portion of the GFC wheel cycle.
Measurement /	MR Ratio		The result of CO2 MEAS divided by CO2 REF. This ratio is the
Reference Ratio		-	primary value used to compute CO2 concentration. The value
			displayed is not linearized.
Sample Pressure	PRES	In-Hg-A	The absolute pressure of the Sample gas as measured by a
			pressure sensor located inside the sample chamber.
Sample Flow	SAMPLE FL		Sample mass flow rate. This is computed from the differential
		cc/min	between the pressures measured up-stream and down-stream of the
			sample critical flow orifice pressures.
Sample	SAMP TEMP	°C	The temperature of the gas inside the sample chamber.
Temperature
Bench	BENCH TEMP	°C	Optical bench temperature.
Temperature
Wheel	WHEEL TEMP	°C	Filter wheel temperature.
Temperature
Box Temperature	BOX TEMP	°C	The temperature inside the analyzer chassis.
O2 Cell	O2 CELL	°C	O2 sensor cell temperature.
Temperature2	TEMP2
Photo-detector	PHT DRIVE		The drive voltage being supplied to the thermoelectric coolers of the
Temp. Control		mV
			IR photo-detector by the sync/demod Board.
Voltage
Slope	SLOPE		The sensitivity of the instrument as calculated during the last
		-	calibration activity. The SLOPE parameter is used to set the span
			calibration point of the analyzer.
Offset			The overall offset of the instrument as calculated during the last
	OFFSET	-	calibration activity. The OFFSET parameter is used to set the zero
			point of the analyzer response.
O2 Sensor Slope 2	O2 SLOPE	-	O2 slope, computed during zero/span calibration.
O2 Sensor Offset 2	O2 OFFSET	-	O2 offset, computed during zero/span calibration.
Test channel	TEST	mV, mA	Displays the signal level of the TEST analog output channel. Only
output signal			appears when the TEST channel has been activated.
Current Time	TIME	-	The current time. This is used to create a time stamp on DAS
			readings, and by the AUTOCAL feature to trigger calibration events.

1Only appears when the instrument’s reporting range mode is set for DUAL or AUTO

2Only appears when the optional O2 sensor is installed.

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