Biuged BGD 285 Manual de instrucciones - Página 6

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Ⅵ. Composing

The complete set of the instrument are as table 1.

(1) BGD 285 basic unit

(2) Compound electrode

(3) Temperature sensor

(4) Electrode supporting rod and extension rod

(5) Electrode clamp

(6) Power supply lead

(7) Buffer powder (pH = 4, 7 and 9)

(8) Electrode short circuit plug

(to be inserted in the input terminal of the

instrument)

(9) Fuse (0.1A)

(10) Instruction manual

(11) Product quality certificate

Appendix Ⅰ Relationship between pH value of a buffer solution and temperature

Table 2

Solution

Temp.（℃）

Appendix Ⅱ Preparation of buffer solution

1. pH 4 buffer solution

Weight 10.21 grams of GR O-potassium bithalate, dilute it into 1000 ml of twice-distilled water.

2. pH 6.86 buffer solution

Weight 3.4 grams of GR potassium phosphate monobasic and 3.55 grams of GR sodium phosphate

oibasic, dilute them into 1000 ml of twice-distilled water.

3. pH 9.20 buffer solution

Weight 3.81 grams of borax, dilute it into 1000 ml of twice-distilled water.

GR O-potassium

bithalate

4.01

4.00

4.01

4.02

4.03

4.04

4.05

4.06

4.08

4.10

1 unit

1 pc

1 bags for each

1 pc

2 pcs

1 copy

GR potassium

phosphate

monobasic

6.95

6.92

6.90

6.88

6.86

6.85

6.84

6.83

6.84

borax

9.39

9.33

9.27

9.22

9.18

9.14

9.10

9.07

9.04

9.01

8.99

8.96