BOQU PHS-1701, User Manual, Page: 15 / 21

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3. Maintenance
3.1 Meter maintenance
It is forbidden to separate the housing of the instrument.
In addition to the occasional need to use a damp cloth to wipe, the instrument does
not need to do other maintenance. The shell is made of plastic and is subject to
erosion by some organic solvents such as toluene, xylene and butanone. If this is
the case, immediately wipe the spill onto the shell of such solvents.
3.2 Electrode maintenance
Ensure that the electrode are always stored in the appropriate storage solution. In
order to obtain maximum accuracy, any filled or coagulated in the sensor outside
the filling liquid are used to remove the distilled water in time. Always store the
electrode according to the manufacturer's regulations and do not dry it. If the slope
of the electrode drops rapidly, or if the corresponding speed is slow, the following
steps can be used. According to different sample, try the following methods:
1. For grease, remove the dirt from the surface of the electrode with raw cotton
dipped in acetone or soapy water.
2. If the sensor film is dry, immerse the electrode tip in 0.1M HCl solution and
allow to stand overnight.
3. If protein is accumulated in the membrane, immerse the electrode in the HCI /
pepsin solution to remove the deposit.