Hach Polymetron 2582sc Manual Del Usuario página 23

Section 8 Troubleshooting
8.1 General troubleshooting
Problem
It takes a long time for
the measurement to
become stable or the
measurement does
not become stable
during calibration in
air.
Probable cause
The sample temperature is very
different from the ambient
temperature. For example, 6 °C
(43 °F) in water and 35 °C (95 °F)
in air will cause a measurement
drift.
There is an electrolyte leak
through the membrane. The
current is too high because of an
excessive penetration of oxygen.
There is contamination in the
electrolyte due to a loose filling
screw.
The electrode is not correctly
mounted in the sensor body, so
there is a gap between the
membrane and the cathode of
the electrode.
The membrane is not correctly
installed. There is a risk of
contamination in the electrolyte.
There is a no humidity due to the
high temperature.
There is water or humidity in the
sensor cable connector.
The gold surface of the electrode
is scratched or damaged.
There is sludge or particles on
the cathode of the electrode.
Damage to the sensor cable or
connections occurred.
The sensor orientation is not
correct. The electrolyte has a
leak and air bubbles have
entered the cathode of the
electrode.
Resolution
Automatic temperature compensation is in the range
0 to 45 °C (32 to 113 °F).
Do the steps in Replace the membrane
Replace the electrolyte. Make sure that the
electrolyte filling washer is installed with the plastic
filling screw. Tighten the plastic filling screw with a
screwdriver, but do not use excessive force.
Remove the electrolyte filling screw. Then, hand
tighten the holding nut for the electrode. Install the
electrolyte filling screw again.
Replace the electrolyte. Install the used membrane
on the sensor body until finger tight.
Use a calibration cap to supply humidity.
Dry the sensor cable connector inside and out.
Replace the electrode. Refer to the illustrated steps
in Assemble the sensor on page 8.
Clean the cathode with a soft and absorbent tissue.
Rinse the membrane with demineralized water.
Examine the sensor cable connection at the module
in the controller. If correct, examine the connections
at the sensor cable connector.
Put the sensor in the correct position (membrane
down).
on page 21.
English 23