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Model GFC7000E Instruction Manual Operating Instructions
04584 Rev A1 63
6.7.7. Dilution Ratio
The dilution ratio is a software option that allows the user to compensate for any dilution of the
sample gas before it enters the sample inlet. Using the dilution ratio option is a 4-step process:
1. Select reporting range units: Follow the procedure in Section 6.7.6.
2. Select the range: Use the procedures in Section 6.7.2 – 6.7.5. Make sure that the SPAN value
entered is the maximum expected concentration of the undiluted calibration gas and that the
span gas is either supplied through the same dilution inlet system as the sample gas or has an
appropriately lower actual concentration. For example, with a dilution set to 100, a 10 ppm
gas can be used to calibrate a 1000 ppm sample gas if the span gas is not routed through the
dilution system. On the other hand, if a 1000 ppm span gas is used, it needs to pass through
the same dilution steps as the sample gas.
3. Set the dilution factor as a gain (e.g., a value of 20 means 20 parts diluting gas and 1 part of
sample gas):
SAMPLE* RANGE = 500.000 PPM CO2 =X.XXX
< TST TST > CAL SETUP
SETUP C.3
PRIMARY SETUP MENU
CFG DAS
RNGE
PASS CLK MORE EXIT
SETUP C.3
RANGE CONTROL MENU
MODE SET UNIT
DIL
EXIT
DIL only appears
if the dilution ratio
option has been
installed
SETUP C.3
DIL FACTOR: 1.0 GAIN
0 0 0 1 .0
ENTR
EXIT
Toggle these keys to set the dilution
factor.
This is the number by which the
analyzer will multiply the CO
2
concentrations of the gas passing
through the reaction cell.
SETUP C.3 DIL FACTOR: 20.0 GAIN
0 0 2
0 .0
ENTR
EXIT
EXIT
ignores the
new setting.
ENTR
accepts the
new setting.
SAMPLE
ENTER SETUP PASS : 818
8 1 8
ENTR
EXIT
The analyzer multiplies the measured gas concentrations with this dilution factor and displays the
result.
NOTE
Once the above settings have been entered, the instrument needs to be recalibrated
using one of the methods discussed in Chapter 7.