Hanna Instruments hi 98140 사용자 설명서
13
pH CALIBRATION PROCEDURE
For greatest accuracy, it is recommended that the instrument is
calibrated frequently. For a faster procedure, it is possible to calibrate
at 1 point, but it is always a good practice to calibrate at 2 points.
A two-point calibration can use any combination of the three sets:
calibrated frequently. For a faster procedure, it is possible to calibrate
at 1 point, but it is always a good practice to calibrate at 2 points.
A two-point calibration can use any combination of the three sets:
(4.01)
(6.86 / 7.01)
(9.18 / 10.01)
Only one value from each set can be selected. For example if pH
7.01 is used as first point, it will not be possible to select pH 6.86
as the second point.
In the case of a two-point calibration (in the acidic range) from 0 to
7 pH, use pH buffer 7.01 (or 6.86) as the first solution and pH buffer
4.01 as the second solution. if testing in the alkaline range from 7 to
14 pH, use pH buffer 10.01 (or 9.18) as the second solution.
Due to electrode conditioning time, the electrode must be kept
immersed a few seconds to stabilize. The meter is equipped with a
stability indicator and the user will be guided step by step with easy
indications on the LCD during the calibration. This will make the
calibration a simple and error-free procedure.
7.01 is used as first point, it will not be possible to select pH 6.86
as the second point.
In the case of a two-point calibration (in the acidic range) from 0 to
7 pH, use pH buffer 7.01 (or 6.86) as the first solution and pH buffer
4.01 as the second solution. if testing in the alkaline range from 7 to
14 pH, use pH buffer 10.01 (or 9.18) as the second solution.
Due to electrode conditioning time, the electrode must be kept
immersed a few seconds to stabilize. The meter is equipped with a
stability indicator and the user will be guided step by step with easy
indications on the LCD during the calibration. This will make the
calibration a simple and error-free procedure.
pH CALIBRATION
1. Rinse the electrode with a portion of the
first calibration buffer or clean water.
Dip the bottom 4 cm (1½") of the
electrode into a beaker containing the
solution.
Dip the bottom 4 cm (1½") of the
electrode into a beaker containing the
solution.
2. Press CAL when the meter displays pH
measurement.
3. Enter the password (if different from "0000") with the arrow keys.
4. Press ALT and CFM to confirm the password or CAL to exit.
4. Press ALT and CFM to confirm the password or CAL to exit.
5. If password is correct, the meter displays "7.01pH" on the lower
LCD with the "BUF 1" and "CAL" indication. The upper LCD shows
the uncalibrated pH reading.
the uncalibrated pH reading.