Model 200E Instruction Manual Operating Instructions
SAMPLE RANGE = 500.0 PPB NOX=X.X
< TST TST > CAL
SETUP
SETUP X.X
PRIMARY SETUP MENU
CFG DAS RNGE PASS CLK MORE EXIT
SETUP X.X RANGE CONTROL MENU
MODE SET
UNIT
EXIT
SETUP X.X
CONC UNITS: PPM
PPM PPB
UGM
MGM
ENTER
EXIT
Select the preferred
concentration unit.
SETUP X.X
CONC UNITS: UGM
PPM PPB
UGM
MGM
ENTER EXIT
EXIT returns
to the main menu.
ENTR
accepts
the new unit,
EXIT returns
to the SETUP
menu.
Conversion factors from volumetric to mass units used in the M200E:
NO: ppb x 1.34 = µg/m
3
; ppm x 1.34 = mg/m
3
NO
2
: ppb x 2.05 = µg/m
3
; ppm x 2.05 = mg/m
3
Concentrations displayed in mg/m
3
and µg/m
3
use 0° C and 760 Torr as standard
temperature and pressure (STP). Consult your local regulations for the STP used by your
agency. EPA protocol applications, for example, use 25° C as the reference temperature.
Changing the units may cause a bias in the measurements if standard temperature and
pressure other than 0°C and 760 Torr are used. This problem can be avoided by recalibrat-
ing the analyzer after any change from a volumetric to a mass unit or vice versa.
CAUTION
In order to avoid a reference temperature bias, the analyzer must be recalibrated
after every change in reporting units.
6.5.7. 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:
• Select concentration units: Follow the procedure in Section 6.5.6.
• Select the range: Use the procedures in Section 6.6. 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
044100102 Rev A 53
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