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12916-00 / 0522
Recipe for calibration solutions:
To prepare 1 litre of calibration solution you will need:
•
950 ml H
2
0 deionised
•
3500 mg potassium chloride
•
50 ml strengthening solution
Take 100 ml of the prepared solution and add 900 ml of dis-
tilled water to it. You now have 900 ml calibration solution
with 3500 mg/l and 1000 ml calibration solution with 350 mg/l
available.
Hints:
-
To ensure measurement accuracy, the measuring
electrode should be immersed in the respective so-
lutions for 60 seconds at constant temperature,
buffer solution and stirring speed before calibration
and measurement.
-
Before changing samples, the electrode should be
completely cleaned and the residual water carefully
dried to avoid cross-contamination between sam-
ples.
5.4 Measured value recording
For the ion measurement of the media to be examined, they
must first be mixed with the strengthening solution (medi-
um:strengthening solution, factor 50:1).
The ion electrode is completely immersed in the medium to
be measured at the measuring head. If a number of different
test solutions are to be measured, it is advisable to rinse the
ion electrode with deionized water between two measure-
ments and carefully shake off the water to avoid cross-
contamination of the samples.
5.5 Maintenance and cleaning of the electrode
After use, clean the electrode with deionized water and dry
carefully. Fit the protective cover, but make sure that the low-
er end of the electrode does not rest on the bottom of the
protective cover. The electrode can be stored permanently in
the activation solution.
5.6 Replacing the battery
Remove the battery
Open the sensor by turning the screw
cap on the back of the sensor counter-
clockwise, e.g. with a coin.
Fig. 5
Lever the battery sensitively,
e.g. with the help of a small
screwdriver or a small pair of
scissors, out of its socket. In-
sert the screwdriver as shown
in Fig. 6.
Fig. 6
Insert new battery
Slide the battery under the golden metal nose (Fig.7-1). Make
sure that the battery is completely under the metal nose and
completely pushed to the upper edge.
Push the battery into the socket
by pressing lightly on the oppo-
site side.
The battery slips under the two
plastic lugs (Fig. 7-2), which is
also noticed by a short "click".
Fig. 7
Before closing, make sure that
the seal in the lid is not bent and
lies neatly on the edge of the lid.
Then tighten the cover clock-
wise.
Fig. 8
6 TECHNICAL DATA
Operating temperature range: 5 - 40°C
Relative humidity < 80%.
Measuring range
Resolution
Accuracy*
0.
4… 3900 mg/l
1 mg/l
±10%
Max. data transfer rate
Battery type
Max. wireless range (open field)
Dimensions (WxHxD)
10 Hz
CR2032
30 m
90 x 44 x 23 mm
Weight (incl. electrode)
*After calibration
94 g
7 SCOPE OF DELIVERY
The scope of delivery includes:
•
Cobra SMARTsense Nitrates Ion
12916-00
•
Nitrate Ion-selective electrode PK-2-004
•
Instruction manual
8 ACCESSORIES
The following accessories are available:
•
Button cell CR2032, 3 V
07922-17
•
Cobra SMARTlink
12999-99
•
Nitrate-ion compound electrode PK-2-004
12916-10
•
USB-Bluetooth-Adapter
07936-00
•
Software measureLAB
14580-61
•
Free measureApp available from supplier portals
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