Omega PHCN-962, Руководство пользователя

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4.2 pH CALIBRATION
This instrument can conduct one point or two points calibration in pre-set standard buffer liquid. The
value of standard buffer solution is based on 25
℃
. You should use those standard buffer solution
which matches above solution when you calibrate the instrument.
1. Entering calibration mode as Item 4.1 described. LCD will show CAL pH. (pH Calibration mode).
Note
：
If LCD shows CAL ORP, please switch pH and ORP measurement mode according to the
procedures of Item 5.8.
2. Press key to enter into calibration, LCD will show slope and function form. The lower display
will show ELE K=59.2, this function form shows the slope of last calibration. The upper display
will show CAL and the main display zone will show SLOP. Press key to enter into calibration
procedures, LCD main display zone will show actual measured value, the right lower display will
show the value of standard solution which should be calibrated.
3. Put electrode into the first standard buffer solution. You should put temperature electrode into the
same solution under the automatic temperature compensation mode. As the same, you should put
liquid earth wire electrode into the solution at the same time in balanced input mode.
4. You can select one point calibration or two point calibration: Press key to calibrate at 6.86 or
7.00pH . The lower display shows BUFF 6.86(7.00) to tell user the standard solution value
under current calibrating. BUFF will blink when calibrating. During calibrating process,
instrument will automatically distinguish signals which electrode input. If the signal input in
required time is stable and in the slope permit range of the formality, the instrument will regard
the calibration as a legal calibration, it will record and modify the zero point information of the
electrode. The lower display will show
BUFF 1.68
to tell the standard solution value the
second point of calibration. Users can press or key to select relevant calibration
solution.
（
USA 1.68>4.01>10.01>12.45
）
(NST 1.68>4.01>9.18>12.45).