Thermo Fisher Scientific CyberScan pH 5000 - Manual (Page 99)

Instruction Manual CyberScan pH5500/ 5000
To Standardize the meter with Auto Buffer Recognition
1. Touch STD on the pH measure screen to access the
standardized screen
2. Touch clear to delete a previous standardization. All pH
standardization values will be cleared. The meter will remain on
the standardization screen at this point.
OR
If the screen says “Not standardized” proceed to step 3.
3. Immerse your rinsed electrode (s) in a buffer solution from the
selected buffer group that you chose during the setup process
(see page 47) and stir gently.
4. Touch
std again to standardize the meter using this buffer. The
word MEASURING will flash until the signal is stable. The meter
will accept the value once it recognizes that the reading is stable.
At that time, STABLE will appear on the screen at this time. A
beaker icon and the entered pH value will also appear on the
screen at this time. The meter will then return to the measure
screen.
5. Touch std on the pH measure screen to access the
standardization screen and repeat steps 3 through 5 to
standardize with up to 5 buffers.
Updating a standardization with Auto Buffer Recognition
You can update a standardization at anytime. To update a
standardization, place your electrode in any of the buffers originally
used to standardize the meter and touch std on the touch screen
twice. The value for that buffer will be updated and stored in the
meter’s memory. The time of standardization will also be updated on
the pH measurement screen.
The efficiency of the electrode is reported as the slope. When doing a
multi-point standardization, the slopes of the individual segment are
calculated by the meter. The slope that appears on the screen is the
slope that is the least perfect, or the farthest from 100%.
For optimal results, the meter should be standardized at a minimum
of every 8 hours. For more accurate measurements, the meter should
be standardized more frequently.
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