Omega PHCN-961, Руководство пользователя, Страница: 19 / 46

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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°C.
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. 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 range, the instrument will accept the
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).