Pressure Compensation - Thermo Scientific 48i Instruction Manual

Operation
Instrument Controls Menu
Compensation
O Compensation
2
3-58 Model 48i Instruction Manual
Pressure
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.
The O
2
off. When O
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:
Abbreviations: C is the measured concentration, O2
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 is the measured O
meas
prevent divide-by-zero errors. C
COR) that may be used for analog outputs or datalogging.
The O2 CONC line shows the measured O
compensation is on or the correction O

PRESSURE COMPENSATION:

COMP PRES:
CURRENTLY:
SET TO:
TOGGLE VALUE
RANGE AVG DIAGS ALARM
Compensation screen is used to turn oxygen compensation on or
compensation is enabled, the following equation is applied to
2
C @ O 2
comp corr
concentration, which is clamped at 20.8% to
2
750.0 mmHg
ON
OFF ?


20 9 .


C *


20 9 .
corr
is the corrected concentration (CO
comp
concentration if the
2
concentration if it is off.
2

O 2

corr

O 2
meas
is the oxygen
Thermo Fisher Scientific