Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 101)

Operating Instructions Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 81
4.8.2. 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.
1. The SPAN value entered during calibration is the maximum expected
concentration of the undiluted calibration gas
2. 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.
3. 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
activateded
SETUP C.3 DIL FACTOR: 1.0 GAIN
0 0 0 1 .0 ENTR EXIT
Toggle each as needed
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 Section 5.