3600 Analyzer for O
2
Measurement—Operator’s Manual 19
3600O2.OM.E9903
For “Dissolved” measurement, the choices are presented as follows:
DISSOLVED
ppb:ppm ppb ppm
The complete list of available units is: ppm, mg/l, % saturation with O
2
, % sat Air,
and ppb:ppm (plus mg/liter in solvent units “mgU” and “mgB”.) In the ppb:ppm
mode, concentrations below 1 ppm are displayed in ppb (1 ppm = 1000 ppb).
If you are making “Partial Pressure” measurements, this screen appears:
PARTIAL PRESSURE
ppm:% psia Atm
The complete list of available units is mbar, bar, kPa, ppm:%, psia, and Atm. In the
ppm:% mode, concentrations below 1% are displayed in ppm (1% = 10000 ppm).
Please be warned that there is no pressure compensation of partial pressure
measurements. Thus, the ppm:% units are valid only if the total pressure remains
constant at the calibration pressure.
Activating the “Fraction” oxygen measurement brings up this screen:
FRACTION
pmv:%V
Fraction measurement is corrected for external pressure. Thus, you must have the
model 28117 external pressure sensor connected (see the Installation Guidelines,
sections 2.1.4.2 and 2.2.5) and calibrated (see section 1.3.3.4) properly. This unit of
measurement “behaves” identically to other composite units, in that
measurements below 1%V are displayed in parts per million (1%V = 10000 pmv).
Dissolved, Partial Pressure and Fraction menus all proceed to this screen, to
determine display resolution:
LOWEST RANGE
XX.XX XXX.X
You can adjust the placement of the decimal point on the lowest measurement
range to one of the options (X.XXX, XX.XX, XXX.X, or XXXX) by pressing the
arrow keys to highlight your choice; then press “ENTER” to activate. Note that
the units on the “lowest range” will be the most sensitive available. Hence, if
ppb:ppm had been selected, then your selection of lowest range refers to ppb.
Next is the menu for specifying the number of measurement ranges.
NUMBER OF RANGES
2 3 4 5
For example, if you only want measurement values from “XX.XX” to “XXX.X”
with the “XX.XX” value as the “lowest”, you would select “2” from this menu.
You should select 5 ranges for a “composite” unit like ppm:%. In that case, you
could request the 5 ranges: X.XXX, XX.XX, and XXX.X ppm, X.XXX and
XX.XX %.
You can specify temperature units, in the last screen of this routine:
TEMPERATURE
°C °F °K
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