Hanna Instruments hi 9224 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 (pH 7.01), but it is always a good practice to calibrate at
2 points.

Due to electrode conditioning time the electrode must be kept
immersed a few seconds to stabilize. The meters are equipped with a
stability indicator and the user will be guided step by step with easy
indications on the display during the pH calibration. This will make
the calibration a simple and error-free procedure.

PH CALIBRATION HI 9224

1. Rinse the electrode with some pH 7.01

(HI7007) solution or clean water. Dip the
bottom 4 cm (1½") of the electrode and the
temperature probe into a beaker containing
pH7.01 solution.

2. Press the CAL key. The secondary (lower) LCD

will blink “7” to indicate that pH 7.01 is
expected and the electrode is conditioning.

3. When the “7” stops blinking, the calibration

can be confirmed. Wait 30 seconds and press
the CFM key to confirm the first buffer.

4. If everything is satisfactory the secondary

LCD will blink “4” expecting the second
buffer at pH 4.01. If wrong solution or
electrode have been used or if the buffer is
out of specifications, E1 will blink to alert
the user.

Note: If only a single point calibration is re-

quired, press CAL to leave the calibration
mode. However, it is always better to
proceed as follows with a two point calibra-
tion.

4 cm

(1½")

HI 7007

CAL

CFM

CAL