Operation
Instrument Controls Menu
3-58
Model 48
i
Instruction Manual
Thermo Fisher Scientific
Pressure compensation provides compensation for any changes to the
instrument's output signal due to reaction chamber pressure variations. The
effects of reaction chamber pressure changes on the analyzer's subsystems
and output have been empirically determined. This empirical data is used
to compensate for any change in chamber pressure.
When pressure compensation is on, the first line of the display represents
the current pressure in the fluorescence chamber. When pressure
compensation is off, the first line of the display shows the factory standard
pressure of 750 mmHg.
●
In the Main Menu, choose Instrument Controls >
Pressure
Compensation
.
PRESSURE COMPENSATION:
COMP PRES: 750.0 mmHg
CURRENTLY: ON
SET TO: OFF ?
TOGGLE VALUE
RANGE AVG DIAGS ALARM
The O
2
Compensation screen is used to turn oxygen compensation on or
off. When O
2
compensation is enabled, the following equation is applied to
the concentration value to generate a corrected value (CO COR). The
corrected value may be output on the analog outputs, stored in logging
memory, or output as streaming data. The corrected values are not
displayed on the Run screen on the front panel, only the non-corrected
values:
2
9
.
20
2
9
.
20
*
2
@
O
O
C
O
C
meas
corr
corr
comp
Abbreviations: C is the measured concentration, O2
corr
is the oxygen
concentration that C is corrected to (this value is set by the user in the
SERVICE > O2 CORRECTION CONC menu and defaults to 15%).
O2
meas
is the measured O
2
concentration, which is clamped at 20.8% to
prevent divide-by-zero errors. C
comp
is the corrected concentration (CO
COR) that may be used for analog outputs or datalogging.
The O2 CONC line shows the measured O
2
concentration if the
compensation is on or the correction O
2
concentration if it is off.
Pressure
Compensation
O
2
Compensation
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