YSI IQ S ENSOR N ET TriOxmatic 701 IQ - Manual (Page 45)

TriOxmatic
®
701 IQ What to do if...
6 - 1 ba76047e01 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
Measured value
fluctuating heavily
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)
Cause Remedy
– Membrane cap loose – Screw the membrane head
tight
– Membrane does not fit snugly on
the gold working electrode
– Change the membrane cap,
then recalibrate (see section
5.3 and section 4.2)