Measuring Conductivity (Optional Feature) - Miele PG 8593 Operating Instructions Manual

Program settings
Measuring
conductivity
(optional feature)
106
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 the final rinse water can vary and fluctuations can
be caused by external conditions like,
- An exhausted water softener and/or demineralization cartridge
(optional accessory).
- a ruptured membrane in the reverse osmosis unit (optional
accessory),
- on-site work on the water supply,
- Interchanged water 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 process chemicals,
- properties of items being processed, e.g. items holding a lot of
water that is carried from one program block to the next,
- 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. non-ionic
tensides are not detected by the sensor.
The conductivity meter is not fitted on all machines as standard and
cannot be fitted retrospectively.