Jenway 7305 User Manual
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6.2.2.2 Changing the Resolution
The resolution that the concentration is displayed as can be selected from 1, 0.1, 0.01 or 0.001 by repeat
presses of the key below the
resolution icon in the settings menu.
6.2.2.3 Using a Standard
The standard menu enables the value of a standard to
be entered. This function is accessed by pressing the key
adjacent to the
standard icon. This opens the extended
number entry screen. Use the keys at the bottom of the
screen to select the digit to be changed. The key below
the digit must be pressed twice to select the adjacent
digit. For example 00 the first press of the key alters 10,
the second press alters 01.
Use the keys adjacent to the
arrow icons to increase or decrease the selected number. Standard values
from 0.001 to 1000 can be entered. The standard value can be reset to zero by pressing the key adjacent
to the
000 icon. Once the standard value has been entered press the key adjacent to the tick icon to
save and return to the settings menu. The entered value is displayed in the settings menu adjacent to the
standard icon. A standard value should only be entered if the factor is not known. If the factor is known
the standard value should be set to 1.000.
6.2.2.4 Using a Factor
The factor menu enables a factor to be entered. This
function is accessed by pressing the key adjacent to
the
factor icon. This opens the extended number entry
screen. Use the keys at the bottom of the screen to select
the digit to be changed. The key below the digit must be
pressed twice to select the adjacent digit. For example
00 the first press of the key alters 10, the second press
alters 01.
Use the keys adjacent to the
arrow icons to increase or decrease the selected number. Factor values of
0.001 to 10,000 can be entered. The factor value can be reset to zero by pressing the key adjacent to the
000 icon. Once the factor has been entered press the key adjacent to the tick icon to save and return to
the settings menu. The entered value is displayed in the settings menu adjacent to the factor icon. If the
factor is not known a standard should be measured in order to calculate the factor. If a standard is used
the factor value should be set to 1.000.
6.3
CALiBRAtion
In the concentration measurement mode calibrations
against a standard or a factor can be performed following
a zero calibration. If the factor is not known calibration
against a known standard is performed in order to
calculate the factor. However if the factor is known there
is no need to calibrate using a standard. The calibration
must be performed at the same wavelength at which the
sample will be measured.
6.3.1
Calibrating to a Standard
Insert a cuvette containing the blank solution into the sample chamber and close the instrument lid.
Press the key below the
calibrate to zero absorbance icon. The instrument will calibrate to zero
absorbance. Insert a cuvette containing the standard concentration sample solution into the sample
chamber and close the instrument lid.
00
1
.0
0
00
000
00
0
1
.0
0
00
000
0.000
0.000
600
09:02
ppm
ABS
nm
0002x
003s
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