Kedida CT-6821, Руководство пользователя, Страница: 5 / 5

深
深
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圳
市
市
柯
柯
迪
迪
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达
电
电
子
子
有
有
限
限
公
公
司
司
S
S
H
H
E
E
N
N
Z
Z
H
H
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E
N
N
K
K
E
E
D
D
I
I
D
D
A
A
E
E
L
L
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E
C
C
T
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R
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N
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C
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C
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.
.
,
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L
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5
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WARRANTY
The meter is warranted to be free for one year from the date of purchase. (Electrode and battery are not included)
This warranty covers normal operation and does not cover battery, misuse, abuse, alteration, tampering, neglect,
improper maintenance or damage resulting from leaking batteries. Proof of purchase is required for warranty repairs.
Warranty is void if the meter has been opened.
NOTE
1. Please operate the meter Under the guidance of professionals.
2. Soak the electrode into the distilled water or purified water for 5 – 30 minutes to activate before use.
3. Please use the standard buffer solutions for pH calibration, and operate it by the calibration steps shown above.
DO NOT press CAL key in NON calibration mode, it may cause the calibration Error.
4. The pH buffer powder should be fully dissolved in water (250ml).
5. In calibration mode, the electrode should be submerged in the buffer solution. Especially pay attention to the
Electrode fixed collar if it is loosen when calibration, it may cause the buffer solution enter the inside of the
meter.
How to make pH buffer solution
There are 3 pH buffer powder supplied with the meter when you buy them, each powder should be Fully dissolved in
water(250ml). DO NOT use the metal containers.
Take the formulation of pH 6.8 buffer solution for example:
1. Put the pH 6.86 buffer material (in the green sachet) in a jar (the volume should be no less than 250ml).
2. Fill the jar with 250ml distill water.
3. Place a glass stick in the solution, swirling it until the white powder dissolved.
4. Store the buffer solution in the cool and dry place. Attach a label on it for further use.
5. For the further calibration, Ensure that there is a constant supply of fresh buffer solution in contact with the
probe. Discard the solution after use.
The way of the formulation of other buffer is same like that . Please mark it clear and prepare to use it for
the future.
The use of standard buffer
：
The buffer solutions (250ml) can be used several times by divided into portions which should be kept in a cool and
dry place(20
℃
-25
℃
). Never reuse the used portion. The electrode should be fully covered by buffer solution when
calibration.