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12
7
pH-indicator strip
8
Digital multi-meter
9
Screwdriver with
voltage control
GB
Open the drain valve of the solar system to fill some of the heat carrying
liquid into the sample test tube. Take one of the pH indicator strips and
dip it in the liquid. Take it out again and compare the colour of the indi-
cator strip with the scale on the packaging and determine the pH-value.
The value should not be below 7.0. Note: If the medium is dark or blurred,
we recommend draining the system, flushing and refilling it with new
heat carrying medium.
See separate Operating Instructions
You should always use this screwdriver for servicing the system. It can
also be used to quickly check the voltage (230 V) at the solar controller.
OEG solar test set
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