Xylem LR 925/01 - Manual (Page 5)

LR 925/01 Cleaning
13 ba75825e01 08/2009
2 Cleaning
CAUTION
To clean the sensor, disconnect it from the instrument.
Outside cleaning We recommend to clean the sensor thoroughly, especially before measuring
low conductivity values.
After cleaning, thoroughly rinse with deionized water and recalibrate if
necessary.
Aging of the
conductivity
measuring cell
Normally, the conductivity measuring cell does not age. Special measuring
media (e.g. strong acids and bases, organic solvents) or temperatures that
are too high may considerably reduce its lifetime or lead to damage. The
warranty does not cover failure caused by measuring conditions and
mechanical damage.
Disposal We recommend to dispose of the measuring cell as electronic waste.
3 What to do if...
Contamination Cleaning procedure
Lime sediments Immerse in acetic acid for 5 minutes (volume
share = 10 %)
Fat/oil Clean with warm water that contains
washing-up liquid
Error symptom Cause Remedy
No temperature or
conductivity display – No connection between meter and
conductivity measuring cell
– Cable defective
– Establish connection between
meter and conductivity measuring
cell
Measurement delivers
implausible conductivity
values – Measuring range exceeded
– Contamination in the area of the
electrodes
– Electrodes damaged
– Make sure the correct sensor is
being used for the application
– Clean the conductivity measuring
cell (see section 2).
– Return the sensor
Incorrect temperature
display – The temperature sensor is not
immersed deep enough in the
measuring solution
– Temperature sensor defective
– Observe the minimum immersion
depth
– Return the conductivity measuring
cell