Teledyne GFC-7001E - Trace CO Analyzer - Manual (Page 101)

Basic Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 101
6.6.3.2. RNGE  MODE  DUAL: Configuring the GFC 7001E/EM Analyzer for DUAL Range
Mode
Selecting the 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 select the DUAL range mode press following keystroke sequence
.
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
concentrations.
The two ranges must be independently calibrated.