Thermo Fisher Scientific CyberScan pH 5000 - Manual (Page 115)

Instruction Manual CyberScan pH5500/ 5000
The incremental methods which include known addition, known
subtraction, analate addition and analate subtraction and are
particularly useful with samples containing complex ionic
backgrounds which cannot be matched in standards. They are also
useful with occasional samples whose temperatures vary. More
information on these methods is available in the ISE Theory Section
(See page 133).
Standardizing the meter for all incremental methods
Prior to conducting an analysis using any of the incremental methods,
it is necessary to standardize the meter with at least two standards.
This will establish a slope value for the electrode in use. The slope
value is required in the incremental method calculations which yield
the ion concentration of the sample. See ISE Theory page 133.
1. Touch
std on the Ion measure screen to access the standardize
screen.
2. Touch clear to delete the previous standardization from the
memory of the meter.
3. Add ionic strength adjuster to the standards and the blank.
4. Immerse the ion selective electrode in the stirring standard.
Always begin standardization with the least concentrated ion
standard.
5. Touch std again to initiate the standardization process.
6. Use the keypad to enter value of the standard.
7. Touch enter on the keypad to accept the value. If you have
entered a value in error, touch BS to clear the value and key in a
new value.
8. Repeat steps 3-7 with additional standards.
Remember, HELP is always just a touch of the button away.
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