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PART THREE - OPERATION
SECTION 4 - CALIBRATE MENU
Model P63 pH Analyzer
Rev. 7-1201
44
☞
Pre-Defined Buffer Method
3.
Using the table on the buffer bottle, find the exact pH
value that corresponds with this temperature.
4.
Key in the exact pH value when the analyzer asks you
to do this.
NOTE:
As you key in the value, the “pH” or “
°
C” annuncia-
tor may flash to indicate that the respective pH or
temperature measurement signal is still too unsta-
ble for an accurate calibration. You can, however,
enter the value while an annunciator flashes but the
resultant calibration error will degrade measure-
ment accuracy.
Recommendation:
For best
calibration accuracy, wait until these annunciators
stop flashing and then enter the value.
The signal stability at which the annunciators stop
flashing is selectable. (Use “Stability Mode” screen
in “Main Parameter” submenu of CONFIGURE
main menu). A LOW stability mode enables the
analyzer to accept a less stable measurement sig-
nal where pH or temperature is moderately
changing. A HIGH stability mode requires the signal
to be highly stable before flashing stops. A MED
stability mode is midway between the other modes.
The HIGH stability mode provides best calibration
accuracy but takes longer. Also, in a noisy envi-
ronment the measurement signal may never fully
stabilize. The stability mode default is LOW.
Reasons to Use:
1. When you consistently use the same buffer(s).
2. When you plan to have a novice or unskilled operator
calibrate (for example, someone who may confuse the
two buffers being used for a two-point calibration).
3. When you plan to use a GLI Cal-Clean™ System.
Advantages/Disadvantages:
The “Pre-Defined Buffer” method takes time to initially set
up but is very accurate and very convenient for novice op-
erators because it eliminates the need to enter buffer
values. Also, the person need not know which buffer the
sensor is in while performing a two-point calibration.
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