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Model 300E Carbon Monoxide Analyzer
Instruction Manual
Operating Instructions
P/N 04288 REV: A
69
6.4.6.
Setting the Measurement Range Unit Type
The M300E can display concentrations in ppb, ppm, ug/m
3
, mg/m
3
units. Changing
units affects all of the COM port values, and all of the display values for all
Measurement Ranges.
To change the units of Measure press
:
SAMPLE
RANGE = 50.0 PPM
CO =
< TST TST > CAL
SETUP
SETUP C.3
CFG DAS
RNGE
PASS CLK MORE
EXIT
SETUP C.3
RANGE CONTROL MENU
MODE
SET
UNIT
EXIT
SETUP C.3
CONC UNITS: PPM
PPM PPB
UGM
MGM
ENTER
EXIT
Select the preferred units of
measure.
EXAMPLE: Switching from
PPM to UGM
SETUP C.3
CONC UNITS: UGM
PPM PPB
UGM
MGM
ENTER EXIT
EXIT
Returns
to the Main
SAMPLE
Display
EXIT
Returns
to the
SETUP
Menu
NOTE
Concentrations displayed in mg/m
3
and ug/m
3
use 0
°
C, 760 mmHg for Standard
Temperature and Pressure (STP).
Consult your local regulations for the STP used by your agency.
CAUTION
Once the units of Measurement have been changed the unit MUST be
recalibrated, as the “expected span values” previously in effect will no longer
be valid. Simply entering new expected span values without running the entire
calibration routine is not sufficient.
The following equations give approximate conversions between volume/volume
units and weight/volume units:
CO ppb x 1.25 = CO ug/m
3
CO ppm x 1.25 = CO mg/m
3