Programme settings
106
Measuring
conductivity
Electrical conductivity in a water based solution is a measure of the
total amount of dissolved conductive substances (e.g. salts, acids,
etc.).
The electrical conductivity during the final rinse phase is relevant for
the processing result. Salts and deposits in the water remain on the
wash load after drying.
High conductivity in this phase can limit the intended use of
processed wash load items.
The conductivity of water used is affected by insufficient / varying
quality at the outset, caused by e.g.,
- an empty water softener and / or demineralisation cartridge
(optional accessory),
- a ruptured membrane in the reverse osmosis unit (optional
accessory),
- on-site work on the water supply,
- transposed plumbing connections after maintenance work,
Possible causes for carry-over of conductive substances from
previous wash blocks are e.g.:
- residual used water,
- residual initial contamination,
- residual chemical agents,
- properties of items being processed, e.g. hollow,
- type of load,
- foam.
The conductivity of the final rinse phase is the total of the
conductivity of water used in water inflow and the carry-over of
conductive substances from the previous wash blocks.
If a conductivity meter is fitted ex-works, the conductivity of the wash
water can be monitored. Non-conductive substances, e.g. ionic
tensides are not detected by the sensor.
The conductivity meter is not fitted on all washer-disinfectors as
standard and cannot be fitted retrospectively.
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