Biuged BGD 285 Gebrauchsanweisung - Seite 5

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electrode into the solution to be measured, stir the breaker till the solution becomes uniform, and read

out the pH value of the solution.

b) In case that the temperature of the solution to be measured different from the temperature of the

setting solution.

To uniform the temperature of the solution to be measured with buffer solution. The instrument can be

used after re-calibration. Or it can be used directly after the temperature of the solution to be measured

is same as buffer solution.

4. Electrode potential (mV value) measurement

a) Remove the Q9 short circuit plug and temperature sensor. Connect in an appropriate ion selective

electrode and reference electrode.

b). Rinse the electrode with distilled water, then ,suck it dry with clean filtering paper.Put the electrode

into the solution to be measured.

c) Put the selection knob on "mV", now the setting, temperature and slope knobs are invalid.Stir the

beaker till the solution becomes uniform. Then, the potential (mV value) of the ion selective electrode

can be read out, and its polarity displayed automatically.

5. Operation and Maintenance

a) The input terminal of this instrument, (i.e. the socket of the glass electrode) should be kept clean.

When it is idle, insert the short circuit plug in it, to avoid any invention of dust or heavy humidity.

b) The compound electrode can be used for one year. After taking off the cap, be careful to avoid the

sensitive glass bulb inside the plastic protection grid being contacted with hard stuff. Any damage or

rubbing will cause the electrode invalid. After the measurement completed, the electrode should be

covered with the protection cap. A few amount of supplementary solution should be contained in the cap

to keep the electrode bulb in a wet state. A 3N potassium chloride solution is served as an external

reference supplementary solution for the combination electrode, which can be injected into the

electrode via the small hole on the top of it.

c) Keep the lead of the compound electrode immobile to prevent from disturb.

d) The buffer solution should be assured of high reliability. It can be prepared by user it self. For the

method of preparing the buffer solution, please see Appendix Ⅱ.

e) The temperature sensor has a long life. But it can not be knock.