YSI IQ S ENSOR N ET VARiON Plus 700 IQ - Manual (Page 57)

VARiON
®Plus
700 IQ What to do if ...
8 - 3 ba76000e01 01/2012
Measurement provides
jumping, unstable or
drifting values
– Electrode contaminated – Clean the electrode (see
section 6.2)
– Liquid in the sensor shaft – Sensor defective, send it back
Cause Remedy
Cause Remedy
– Measurement /
compensation electrode:
Electrode membrane not
moistened by measuring
solution, e.g. due to air in
front of the membrane
– Moisten membrane with
deionized water using a wash
bottle. To do so, position the
opening of the wash bottle on
the membrane and splash
against the membrane
vigorously
– Measurement /
compensation electrode:
Air bubble behind the
membrane
– Hold the electrode in a vertical
position with the membrane
down and knock it on the side
with the special socket wrench
– Measurement electrode /
compensation and reference
electrode:
Insufficient electrical contact
in the electrode receptacle
– Check the installation and
contacts of the electrode (gap-
free mounting)
– Check electrode receptacle for
moisture
– If necessary, unscrew the
electrode/blind plug and
thoroughly dry the electrode/
blind plug and receptacle
– Reference electrode dried up – Replace reference electrode
– Measurement /
compensation electrode or
reference electrode leaky or
damaged
– Replace defective electrode
– Liquid in the sensor shaft – Sensor defective, send it back