CD-208 CONTROLLER is not only a very reliable,
and highly exact conductivity measuring instrument (1µS) with an
4-digits LCD display but it also serves also for the regulation
of the CD value in liquids e.g. water in ponds, aquarium,
swimming pool, whirlpool, spa or pool etc. This controller is suitable
for applications in sweet and salt-water. The
measuring instrument is fully supplied, operationally and calibrated
simply set the desired CD value at the controller. If the currently
measured CD-value increases or decreases this deviation is adjusted.
This is done with the relay-steered 230V plug socket belonging to
to the controller, which depending upon requirement is powered on
or off. You can attach every 230V device to it e.g. air outlet stone,
oxygen pump, CO2-regulator, electromagnetic valve, water
Fish hatchery, wine production, swimming pool (bath), floristics,
analysis of fluids (ph-value), ponds, various industrial application,
Pisciculture, Koi, Kois, Boilere, Pond, Pool, Spa, swimming pools,
pool, analysis of liquids, orchids breed, breeder, hemp, grow
TDS/ Conductance/ Conductivity in practice use:
In the aquaristic is the conductance (conductivity) apart from the
pH value an important character-istic for the water quality. With
this EC meter you can examine the quality of the pure water from
your osmose device or full demineralizer or the quality of your
aquarium water/ blend water with the water change.
here for further calibration and maintanance liquids
The measurement in the fresh water aquarium results in 600 µS/cm,
in the tap water however 300 µS/cm. Thus a partial water change
is to be done.
Examine the quality of your water. As appoximate values to water
is considered generally:
Water to 120 µS as very good deslagging and is favorable to
health. Of 300 - 600µS is the water rather loading and starting
from 600 µS it is to be designated as bad .
In the case of control in the sea water basin 53000 results µS/cm.
From the usual conductivity tables of sea water (with 25°C)
you read a content of salt of 35 parts per thousand with 53,8 (mscm)
off. Sea water is correct.
With control of your permeat of a reverse osmosis device you obtain
a measured value from 20 µS/cm. The permeat is thus correct.
is the electrical conductivity actually?
With demineralized water, no solved CO2 contained you measures the
conductivity zero (actually it would be 0.055 µS/cm). That
corresponds to the intrinsic conductivity of the water (h-ions and
OH ions dissociate). In the qquaristic applies: Demineralized water
has practically no conductivity. The addition spoon common salt
(10g) into a litre demineralized water causes a value of 15000 µS/cm.
The common salt (NaCl) dissolves completely in sodium ions (Na+)
and chloride ions (Cl -) and so an ionic conduction is produced.