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Instruction Manual
IM-106-5500, Original Issue
August 2005
CCO 5500
5-4
An example of resetting the span factor is outlined below:
• Certified check cell of 2880 ppm is inserted into the check cell holder
with the analyzer in Mode 6 and a reading taken. This reading is 3240.
• Due to the value of the check cell exceeding 999 ppm a suitable
pathlength needs to be used to reduce the effective value of the check
cell. In this case a pathlength of 4 m is chosen, thus the effective value
of the check cell in 720 ppm (2880/4).
• However, in Mode 6 it reads higher (3240); this value is effectively 810
ppm at a 4 m pathlength.
• 810 is keyed in as the first value in the span factor option.
• The span factor is then adjusted until the second value reads 720.
• Now press Enter to set the span factor.