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Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 95
6.8.6. Range Units
The GFC 7000TA can display concentrations in parts per billion (10
9
mols per mol, PPB), parts per million
(10
6
mols per mol, PPM), micrograms per cubic meter (µg/m
3
, UG), milligrams per cubic meter (mg/m
3
,
MG) or percent (volume CO
2
/volume sample gas, %). Changing units affects all of the display, analog
outputs, COM port and DAS values for all reporting ranges regardless of the analyzer’s range mode.
NOTE
Concentrations displayed in mg/m3 and ug/m3 use 0C, 760 mmHg for Standard
Temperature and Pressure (STP). Consult your local regulations for the STP used
by your agency.
Conversion factors from volumetric to mass units are:
CO
2
: ppb x 1.96 = µg/m3; ppm x 1.96 = mg/m3
To change the concentration units:
SETUP X.X CONC UNITS: %
PPM PPB UGM MGM % ENTER EXIT
SAMPLE RANGE = 500.00 PPB CO2=X.XXX
< TST TST > CAL SETUP
SETUP X.X
PRIMARY SETUP MENU
CFG DAS RNGE PASS CLK MORE EXIT
SETUP X.X RANGE CONTROL MENU
MODE
SET UNIT EXIT
SETUP X.X CONC UNITS: PPM
PPM PPB UGM MGM % ENTER EXIT
Select the preferred
concentration unit.
EXIT returns
to the main menu.
ENTR accepts
the new unit,
EXIT returns
to the SETUP
menu.
NOTE
Once the units of measurement have been changed the unit MUST be recalibrated,
as the “expected span values” previously in effect will no longer be valid. Simply
entering new expected span values without running the entire calibration routine
is not sufficient.