JDC Electronic SA EasyFlow User Manual
Page 8
8
MADD
Technologies sàrl
–
Avenue des Sports 42 – CH-1400 Yverdon-les-Bains – Switzerland
Tel: +41 24 445 31 16 – Fax: +41 24 445 21 23 – Email: [email protected] – www.madd.ch
C
C
a
a
l
l
i
i
b
b
r
r
a
a
t
t
i
i
o
o
n
n
o
o
f
f
t
t
h
h
e
e
p
p
r
r
o
o
b
b
e
e
Cleaning of the probe
Ensure that the probe is clean before starting calibration. Clear the electrodes from calcareous deposits using
a specific cleaning agent (Durgol, cleaning vinegar etc.). To do so, remove the protective cap covering the glass
tube around the electrodes for easy access. Pour cleaning agent into a recipient up to the level necessary for
complete immersion of the probe's glass part which should remain in the cleaning liquid for about 20 minutes.
Rinse the probe thoroughly in order to clear off completely the cleaning liquid, let it dry and then place it into
previously prepared half-litre of pure water.
Preparing the calibration
Following preparation is necessary before calibrating the probe for salinity gauging.
Prepare very precisely 100 ml of demineralised water with a maximum conductivity of
10 μS (or a resistivity of at least 100'000 ). Place this water in a cleaned 1 litre
plastic measure. For maximum measurement accuracy, it is also possible to weight
the water (100 grams of demineralised water). Place the probe of the EasyFlow into
the water.
Prior to the actual calibration the probe should have the waters temperature, which
can be checked by setting the EasyFlow in Multimetre mode and ensuring that the
temperature remains stable. Once all parameters meet the conditions laid down the
actual calibration, taking only a few seconds, can be carried out
Calibration
From the main menu, choose Calibration then Calibration -> 3200 mg/l with help of
the buttons SELECT and ENTER.
The calibration of the salinity probe is done in 5 points: at 0 mg/l, 2200 mg/l, 1200 mg/l, 629 mg/l and 321 mg/l.
Just follow the instructions that appear on the display
1. Place the probe into 100 ml of demineralised water (see instructions on
previous page, chapter 4.2). Be sure that the probe is well in water and press
ENTER.
2. Poor a calibration dose of 20 ml into pure water and use the probe to stir it well
in order to get a homogenous mixture. At this moment the solution contains
2200 mg of salt per litre of water. Press ENTER.
3. The third point of the calibration is obtained by adding 100 ml of pure water to
the solution. So the salinity reaches 1200 mg of salt per litre. Well stir and
press ENTER when the solution is homogenous.
4. Adding 200 ml of pure water to the solution to obtain the fourth point of the
calibration. Now the salinity reaches 629mg of salt per litre. Well stir and press
ENTER when the solution is homogenous.
5. The calibration of the fifth and last point is done by adding 400 ml of pure water
to the solution. The final salinity is at 321 mg/l. Stir well the solution and press
ENTER when the solution is homogenous.
6. The device will automatically calculate the precise values of the 5 calibration
points. It will furthermore determine the non-linearity of the probe and compute
the necessary corrections.