Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 100)

Model 9110TH NOx Analyzer Operating Instructions
Teledyne Analytical Instruments 80
4.8. SETUP  RNGE: RANGE UNITS AND DILUTION
CONFIGURATION
This Menu is used to set the units of measure to be associated with the analyzer’s
reporting ranges (see Section 4.13.4.2. for more information on reporting ranges vs.
physical ranges) and for instruments with the sample gas dilution option operating, to set
the dilution ratio.
4.8.1. RANGE UNITS
The 9110TH/M can display concentrations in parts per million (10 6 mols per mol, PPM)
or milligrams per cubic meter (mg/m 3 , MGM). Changing units affects all of the
display, COM port and DAS values for all reporting ranges regardless of the analyzer’s
range mode. To change the concentration units:
SAMPLE A1:NXCNC1= 100.0 PPM NOX=XXX.X
< TST TST > CAL SETUP
SETUP X.X PRIMARY SETUP MENU
CFG DAS RNGE PASS CLK MORE EXIT
SETUP X. RANGE CONTROL MENU
UNIT DIL EXIT
SETUP X.X CONC UNITS: PPM
PPM MGM ENTER EXIT
Select the preferred
concentration unit.
SETUP X.X CONC UNITS: MGM
PPM 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 9110TH/M:
NO: ppm x 1.34 = mg/m 3
NO
2
: 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 recalibrating the analyzer after any change from a volumetric to a mass unit
or vice versa.
Note In order to avoid a reference temperature bias, the analyzer must be
recalibrated after every change in reporting units.