Hanna Instruments pH 210 - Manual (Page 13)

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ACCESSORIES ACCESSORIES ACCESSORIES ACCESSORIES ACCESSORIES
pH BUFFER SOLUTIONS
HI 70004P pH 4.01 Buffer Sachets, 20 mL, 25 pcs
HI 70007P pH 7.01 Buffer Sachets, 20 mL, 25 pcs
HI 70010P pH 10.01 Buffer Sachets, 20 mL, 25 pcs
HI 7004L pH 4.01 Buffer Solution, 500 mL bottle
HI 7006L pH 6.86 Buffer Solution, 500 mL bottle
HI 7007L pH 7.01 Buffer Solution, 500 mL bottle
HI 7009L pH 9.18 Buffer Solution, 500 mL bottle
HI 7010L pH 10.01 Buffer Solution, 500 mL bottle
HI 8004L pH 4.01 Buffer Sol. in FDA approved bottle, 500 mL
HI 8006L pH 6.86 Buffer Sol. in FDA approved bottle, 500 mL
HI 8007L pH 7.01 Buffer Sol. in FDA approved bottle, 500 mL
HI 8009L pH 9.18 Buffer Sol. in FDA approved bottle, 500 mL
HI 8010L pH 10.01 Buffer Sol. in FDA approved bottle, 500 mL
ELECTRODE STORAGE SOLUTIONS
HI 70300L Storage Solution, 460 mL bottle
HI 80300L Storage Solution in FDA approved bottle, 460 mL
ELECTRODE CLEANING SOLUTIONS
HI 70000P Electrode Rinse Sachets, 20 mL, 25 pcs
HI 7061L General Cleaning Solution, 460 mL bottle
HI 7073L Protein Cleaning Solution, 460 mL bottle
HI 7074L Inorganic Cleaning Solution, 460 mL bottle
HI 7077L Oil & Fat Cleaning Solution, 460 mL bottle
HI 8061L General Cleaning Sol. in FDA approved bottle, 460 mL
HI 8073L Protein Cleaning Solution in FDA approved bottle, 460 mL
HI 8077L Oil & Fat Cleaning Sol. in FDA approved bottle, 460 mL
ELECTRODE REFILL ELECTROLYTE SOLUTIONS
HI 7071 3.5M KCl+AgCl Electrolyte, 4x50 mL, for single junction
electrodes
HI 7072 1M KNO
3
Electrolyte, 4x50 mL
HI 7082 3.5M KCl Electrolyte, 4x50 mL, for double junction
electrodes
HI 8071 3.5M KCl+AgCl Electrolyte in FDA approved bottle,
4x50 mL, for single junction electrodes
HI 8072 1M KNO
3
Electrolyte in FDA approved bottle, 4x50 mL
HI 8082 3.5M KCl Electrolyte in FDA approved bottle, 4x50 mL
Typical Electrode Life
Ambient Temperature 1- 3 years
90 °C Less than 4 months
120 °C Less than 1 month
Alkaline Error
High concentrations of sodium ions interfere with readings in alkaline
solutions. The pH at which the interference starts to be significant
depends upon the composition of the glass. This interfe-rence is called
alkaline error and causes the pH to be underestimated. Hanna’s glass
formulations have the indicated characteristics.
1.0 Mol L -1 Na +
0.1 Mol L -1 Na +
Sodium Ion Correction for Glass at 20-25 °C
Concentration pH Error
13.00
13.50
14.00
12.50
13.00
13.50
14.00
0.10
0.14
0.20
0.10
0.18
0.29
0.40
The resistance of glass electrodes partially depends on the temperature.
The lower the temperature, the higher the resistance. It takes more time
for the reading to stabilize if the resistance is higher. In addition, the
response time will suffer to a greater degree at temperatures below 25 °C.
Since the resistance of the pH electrode is in the range of 50-200 Mohms,
the current across the membrane is in the pico Ampere range. Large
currents can disturb the calibration of the electrode for many hours.
For these reasons high humidity environments, short circuits and
static discharges are detrimental to a stable pH reading.
The pH electrode’s life also depends on the temperature. If constantly
used at high temperatures, the electrode life is drastically reduced.
TEMPERATURE CORRELATION TEMPERATURE CORRELATION TEMPERATURE CORRELATION TEMPERATURE CORRELATION TEMPERATURE CORRELATION
FOR FOR FOR FOR FOR pppppH SENSITIVE GLASS H SENSITIVE GLASS H SENSITIVE GLASS H SENSITIVE GLASS H SENSITIVE GLASS