八． Maintain
The transmitter in the normal circumstances, do not need to do any
maintenance, the only electrode need regular cleaning and correction, to
ensure that accurate and stable measurement of the value and maintain the
normal system. The cleaning cycle electrode to the degree of pollution in a
sample of water and, in general, the best can regularly every week cleaning
and maintenance time: the following table for different types of pollution, the
cleaning liquid used to introduce commentary, provided as a reference for
cleaning and maintenance operator:
Type of pollution Cleaning method
Test solution containing
protein, resulting in
electrode membrane
pollution
The electrode was immersed in Pepsin/HC
L solution for several hours.
Pollution of sulfide (elec
trode diaphragm to blac
k)
The electrode was immersed in Thiourea/
HCL solution, and the electrode membran
e became white.
Contamination of oils or
organics
Using acetone or ethanol to clean the ele
ctrode for a few seconds.
General pollution Using 0.1M NaOH or 0.1M HCL to clean
the electrode for a few minutes.
When using the above method after cleaning the electrode, please r
inse it thoroughly with clean water, pass the electrode into 3MOL K
CL solution for about fifteen minutes, then re do the electrode corr
ection.
In the process of electrode cleaning, do not rub the sensor glass he
ad or take the mechanical cleaning electrode, otherwise it will prod
uce static interference and influence the electrode reaction.
Platinum electrode cleaning, available water to wipe the gold white
muslin.
Note: the electrode cleaning cycle depends on the degree of contamination
of the water sample. It is generally recommended to clean and correction at
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