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Teledyne API - Model 200EH/EM Operation Manual Operating Instructions
81
6.8.2. 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.
12. The
SPAN value entered during calibration is the maximum expected concentration of the undiluted
calibration gas
13. The span gas should be either supplied through the same dilution inlet system as the sample gas or be
supplied at an appropriately lower actual concentration.
For example, with a dilution set to 100, a 1 ppm gas can be used to calibrate a 100 ppm sample gas if
the span gas is not routed through the dilution system.
On the other hand, if a 100 ppm span gas is used, it needs to pass through the same dilution steps as
the sample gas.
14. Set the dilution factor as a gain (e.g., a value of 20 means 20 parts diluent and 1 part of sample gas):
The analyzer will multiply the measured gas concentrations with this dilution factor and displays the
result.
SAMPLE A1:NXCNC1=100PPM NOX=XXX.X
< TST TST > CAL SETUP
SETUP C.3
PRIMARY SETUP MENU
CFG DAS RNGE PASS CLK MORE EXIT
SETUP C.3 RANGE CONTROL MENU
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 NO, NO
2
and NO
x
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.
The analyzer multiplies the measured gas concentrations with this dilution factor and displays the result.
Calibrate the analyzer. Once the above settings have been entered, the instrument needs to be recalibrated
using one of the methods discussed in Chapter 0.
04521C (DCN5731)