YSI IQ S ENSOR N ET TriOxmatic 702 IQ - Manual (Page 41)

TriOxmatic
®
702 IQ What to do if...
6 - 1 ba76048e01 01/2012
6 What to do if...
The sensor is in the air
and the display shows
0.0 mg/l or 0 % O
2
The sensor cannot be
calibrated
If the sensor still cannot
be calibrated after
changing the electrolyte
and membrane cap
Mechanical damage to
the sensor
Measured values too low
Cause Remedy
– No electrolyte in the membrane
head
– Change the WP 25i
membrane head (see
section 5.3)
Cause Remedy
– Contaminated membrane head – Clean the outside of the
sensor (according to
operating manual), wait at
least 15 minutes and
recalibrate it.
– In the case of contamination
that cannot be removed:
Change the membrane
head and electrolyte
Cause Remedy
– Contaminated electrodes or
sensor toxification
– Clean the electrodes (see
section 5.4)
Cause Remedy
– Return the sensor
Cause Remedy
– Membrane contaminated
– Sensor has not been calibrated
for a long time
– Clean the outside of the
sensor, then recalibrate (see
section 5.2 and section 4.2)
– Membrane does not fit snugly on
the gold working electrode
– Change the membrane cap,
then recalibrate (see section
5.3 and section 4.2)
– Minimum approach flow not
present
– Ensure sufficient approach
flow