Bluelab Guardian Monitor - Manual (Page 13)

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13
13.0 Cleaning the conductivity/temperature probe
Cleaning the Bluelab Conductivity/Temperature Probe
Cleaning the conductivity/temperature probe periodically ensures accurate readings.
The conductivity/temperature probe is cleaned using the Bluelab Conductivity Probe Cleaner, or “Jif”
a trade name for a liquid scourer cream used in home bathrooms and kitchens. Similar products are
called “Liquid Vim”, “Soft Scrub”, “Cif cream”, or “Viss”. Never use scented varieties as they contain
oils that contaminate the conductivity/temperature probe.
Follow the steps below to clean the conductivity/temperature probe.
Remove shroud.
Warm the shroud in your hand for a few
seconds to help with removal. Hold the
body and pull the shroud off.
Clean the conductivity probe face.
Place one or two drops of Bluelab
Conductivity Probe Cleaner onto the probe
face and rub with the Bluelab Chamois or
your fi nger fi rmly and vigorously.
Rinse the conductivity probe face.
Rinse off all traces of cleaner under
running tap water while scrubbing the
probe face with the other side of the
Bluelab Chamois or the same fi nger.
Check that the water forms a smooth
fi lm on the probe face. Ensure you have
a clean, smooth fi lm without any beads
of water.
If you have beads of water, repeat steps 2
and 3.
Refi t the shroud and test in 2.77 EC
Conductivity Standard Solution to
ensure adequate cleaning.
Place the probe tip into the solution, wait
for the reading to stabilize to a constant
value. This can take a few minutes while
the probe adjusts to the temperature of
the solution.
Repeat the cleaning process if the reading
given is not within 0.1 EC, 1 CF, 50 ppm or
70 ppm of the values in the table below.
Testing the Bluelab Conductivity/Temperature Probe
The conductivity/temperature probe is tested in either
2.77EC/27.7CF/1385 ppm or 1940 ppm solution
depending on the unit of conductivity chosen.
Use the standard solutions in the table to the
right. Bluelab solutions are recommended.
NOTE: The shroud MUST be left on the probe when taking readings.
1
2
3
4
5
Unit
chosen
EC CF ppm
500
ppm
700
Solution
required
2.77 27.7 1385 1940
uneven beads
of water
2.77 EC Conductivity
Standard Solution
clean, smooth
fi lm of water
1
3
3
5
2