1, equipment use before the calomel electrode and glass electrode immersed in distilled water24h.
In 2, the electrode installation, switch on the power, press the pH key,30min preheating apparatus.
3, by using the known pH value of buffer solution calibration instrument.
In4,20+ / - 2 DEG C is measured under the condition of admixture pH.
In 5, the test sample is the solution in a glass cylinder, Bob immersion fluid to be measured is central, the beam out of balance beam, in V shaped groove and hooks with corresponding weights so as to restore the balance, which measured the relative density of the sample liquid.
6, test should be in 20 + / -2 DEG C.