Thermo Scientific 42i, Инструкция по эксплуатации

Страница: 54 / 324

Operation
Calibration Factors Menu
3-18 Model 42 i Trace Level Instruction Manual Thermo Fisher Scientific
NO reading to be at 0 ppb, i.e., a NO reading of 0.09 ppb minus a NO
background reading of 0.09 ppb gives the corrected NO reading of 0 ppb.
To set the NO reading in the example below to zero, use to
increment the NO background correction to 0.09 ppb. As the NO
background correction is increased, the NO concentration is decreased.
Note that at this point, pressing
and however, has no affect
on the analog outputs or the stored NO background correction of 0.0 ppb.
A question mark following both the NO reading and the NO background
correction indicates that these are proposed changes as opposed to
implemented changes. To escape this screen without saving any changes,
press
to return to the Calibration Factors menu or to return
to the Run screen. Press to actually set the NO reading to 0 ppb and
store the new background correction of 0.09 ppb. Then the question mark
prompt beside the NO reading disappears.
●
In the Main Menu, choose Calibration Factors > NO, NOx, or
Prereactor Bkg .
NO BACKGROUND:
NO: 0.09
SET BKG TO: 0.00
©ª INC/DEC
ƒ
SAVE VALUE
RANGE AVG DIAGS ALARM
The NO, NO
2
, and NO
x
span coefficient are usually calculated by the
instrument processor during calibration. The span coefficients are used to
correct the NO, NO
2
, and NO
x
readings. The NO and NO
x
span
coefficients normally has a value near 1.000. The NO
2
span coefficient
normally has a value between 0.95 and 1.050.
The NO, NO
2
, and NO
x
Coefficient screens allow the NO, NO
2
, and
NO
x
span coefficients to be manually changed while sampling span gas of
known concentration. The NO, NO
2
, and NO
x
Coefficient screens operate
the same way. Therefore, the following description of the NO coefficient
screen applies to the NO
2
, and NO
x
coefficient screens as well.
The display shows the current NO concentration reading. The next line of
the display shows the NO span coefficient that is stored in memory and is
being used to correct the NO concentration. Notice that as the span
coefficient value is changed, the current NO concentration reading on the
above line also changes. However, no real changes are made to the value
NO, NO
2
, and NO
x
Coefficients