dosatron GREEN Serie Manual Del Usuario página 29

PUTTING INTO ORDER
Both the EC reader and the probe
are supplied already fitted.
Open the EC reader housing
(removing the 4 screws at the front)
and remove the battery protective
tab.
(Please pay attention to the
polarity symbols + and -)
Probe cable gland
Close back the housing and the
reader will be operational.
OPERATION
Measurement shall only be accurate if the probe is in direct contact with the
fluid.When the probe is in contact with the air, the measured value is close
to 0.0 mS.
EC reading is
displayed in mS/cm
Red warning light
on = replace the
2 batteries
CALIBRATION TO BE CARRIED OUT ONCE A YEAR
The calibration and correct operation check of the EC reader is done using
a 1.413 mS conductivity reference solution. Place the probe in the reference
solution (not supplied).
© ©
DOSATRON INTERNATIONAL / 57 DOSATRON INTERNATIONAL / 57
Compartment for 2
x AA size batteries
3 terminal
connectors for the
EC probe
Protective battery tab
to be removed prior to
commissioning
The reading of the
measured values
is displayed for 20
seconds
Calibration by
immersion in a 1.413
mS conductivity
reference solution
Measuring electrodes
Press the calibration button for 5 seconds; the unit will automatically
calibrate itself to 1.4 mS (+/- one digit)
If calibration fails, the EC reader will show (---). In this case, the device is
likely to be faulty or the conductivity of the reference solution being used is
not 1.4 mS. (Please refer to the next chapter)
EC PROBE MAINTENANCE
In order to work properly, the 2 measuring electrodes of the EC probe must
be clean and in good condition (not broken or bent).
When the EC probe has not been used for over 1 month, the two electrodes
must be cleaned with fine grade emery cloth.
In case of failure, the probe cable must be checked using an ohmmeter
- One of the probe electrodes is connected to the white wire
- The other electrode is connected to the blue wire.
- The "NTC" thermistor probe is connected between the red and the white
wires (10 K at 25°C)
If any of the three measurements shows incorrect readings, your EC probe
is to be replaced.
NOTE: Measurements shall be made with the EC reader wiring disconnected.
©
DOSATRON INTERNATIONAL / 58
PLEASE NOTE:
THE STAINLESS STEEL
ELECTRODES MUST NOT
TOUCH THE BOTTOM OF THE
CONTAINER.
THEY MUST BE SUSPENDED
2 CM (1 inch) FROM THE BOTTOM.
OTHERWISE, THE MEASUREMENT
PROVIDERS WILL BE
INACCURATE.