Teledyne GFC 7001EM operation manual Selecting a Test Channel Function for Output A4

Advanced Features Model GFC7001E Carbon Dioxide Analyzer

7.4.6.SELECTING A TEST CHANNEL FUNCTION FOR OUTPUT A4

The test functions available to be reported are listed in Table 7-10:

Table 7-10: Test Channels Functions available on the GFC 7001E/EM’s Analog Output

TEST CHANNEL	DESCRIPTION	ZERO	FULL SCALE *
NONE	TEST CHANNEL IS TURNED OFF.
CO MEASURE	The demodulated, peak IR detector output
	during the measure portion of the GFC Wheel	0 mV	5000 mV
	cycle.
CO REFERENCE	The demodulated, peak IR detector output
	during the reference portion of the GFC	0 mV	5000 mV
	Wheel cycle.
SAMPLE PRESS	The absolute pressure of the Sample gas as
	measured by a pressure sensor located inside	0" Hg	40 "Hg
	the sample chamber.
SAMPLE FLOW	Sample mass flow rate as measured by the	0 cm3/m	1000 cm 3/m
	flow rate sensor in the sample gas stream.
SAMPLE TEMP	The temperature of the gas inside the sample	0C	70C
	chamber.
BENCH TEMP	Optical bench temperature.	0C	70C
WHEEL TEMP	GFC Wheel temperature.	0C	70C
O2 CELL TEMP	The current temperature of the O2 sensor	n	70C
	measurement cell.
CHASSIS TEMP	The temperature inside the analyzer chassis.	0C	70C
PHT DRIVE	The drive voltage being supplied to the
	thermoelectric coolers of the IR photo-	0 mV	5000 mV
	detector by the Sync/Demod Board.

* Maximum test signal value at full scale of test channel output.

Once a function is selected, the instrument not only begins to output a signal on the analog output, but also adds TEST to the list of test functions viewable via the front panel display.

Teledyne Analytical Instruments 144