Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 93
6.8.4. Dual Range Mode (DUAL)
Selecting Dual Range mode allows the A1 and A2 outputs to be configured with different reporting
ranges. The analyzer software calls these two ranges low and high. The low range setting corresponds
with the analog output labeled A1 on the Rear Panel of the instrument. The high Range Setting
corresponds with the A2 output. While the software names these two ranges low and high, they do not
have to be configured that way. For example: The low range can be set for a span of 0-1000 ppm while
the high range is set for 0-500 ppm.
In DUAL range mode the RANGE test function displayed on the front panel will be replaced by two
separate functions:
RANGE1: The range setting for the A1 output.
RANGE2: The range setting for the A2 output.
To set the ranges press following keystroke sequence
.
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 RANGE MODE: SNGL
SNGL DUAL AUTO ENTR EXIT
SETUP X.
RANGE CONTROL MENU
MODE
SET UNIT EXIT
SETUP X.X HIGH RANGE: 500.0 Con
0 0 5 0 0 .0 ENTR EXIT
SETUP X.X LOW R
NGE: 500.0 Con
0 0 1 0 0 .0 ENTR EXIT
SETUP X.X RANGE CONTROL MENU
MODE
SET UNIT EXIT
EXIT Returns
to the Main
SAMPLE Display
SETUP X.X RANGE MODE: DUAL
SNGL
DUAL AUTO ENTR EXIT
Toggle the
numeral buttons
to set the upper
limit of each
range.
SAMPLE* RANGE = 500.000 PPM CO2 =X.XXX
< TST TST > CAL SETUP
When the instrument’s range mode is set to DUAL the concentration field in the upper right hand corner
of the display alternates between displaying the low range value and the high range value. The
concentration currently being displayed is identified as follows: C1 = Low (or A1) and C2 = High (or A2).
NOTE
In DUAL range mode the LOW and HIGH ranges have separate slopes and offsets
for computing CO
2
concentration.
The two ranges must be independently calibrated.
