PHYWE Cobra SMARTsense Potassium Ion User manual

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www.phywe.com, © All rights reserved 12916-00 / 0522
Operating instruc-
tions
Cobra SMARTsense Potassium Ion
12916-00
PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10
D–37079 Göttingen
Telefon [phone]
Fax [phone]
E-mail [email protected]
Internet www.phywe.com
The unit complies
with the applicable
EC-guidelines
Fig. 1: 12916-00 Cobra SMARTsense Potassium Ion
TABLE OF CONTENTS
1SAFETY PRECAUTIONS
2PURPOSE AND CHARACTERISTICS
3FUNCTIONAL AND OPERATING ELEMENTS
4NOTES ON OPERATION
5 HANDLING
6TECHNICAL DATA
7SCOPE OF DELIVERY
8ACCESSORIES
9 CONFORMITY
10 DISPOSAL
1 SAFETY PRECAUTIONS
•Carefully read these operating instructions completely
before operating this instrument. This is necessary to
avoid damage to it, as well as for user-safety.
•Only use the instrument for the purpose for which it was
designed.
•Only use the instrument in dry rooms in which there is no
risk of explosion.
•Protect the instrument from dust, moisture and vapours.
Use a slightly moist lint-free cloth to clean the instrument.
Do not use aggressive cleaning agents or solvents.
2 PURPOSE AND CHARACTERISTICS
The sensor is used for the measurement of potassium ion
concentrations in liquids and the wireless transmission of the
measured values via Bluetooth to any end device such as
tablets, smartphones, etc.
Caution!

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3 FUNCTIONAL AND OPERATING ELEMENTS
3.1 Operating elements
The sensor has an on-button and two LEDs for indicating the
Bluetooth and battery charge status.
On-button
Press the on-button for more than 3 seconds to switch the
sensor on and off
Bluetooth-LED
Flashing red every 2 seconds
Not connected
Flashing green every 2 seconds
Connected to the ter-
minal device
Flashing green every 4 seconds
Running measurement
Battery charge LED
Flashing red every 5 seconds
Low battery
3.2 Measurement inputs
On the front side of the sensor there is a BNC connector to
which the supplied potassium ion-selective electrode (PK-2-
004) can be connected.
4 NOTES ON OPERATION
The device fulfils all of the technical requirements that are
compiled in current EC guidelines. The characteristics of this
product qualify it for the CE mark.
This instrument is only to be put into operation under special-
ist supervision in a controlled electromagnetic environment in
research, educational and training facilities (schools, universi-
ties, institutes and laboratories).
The individual connecting leads are each not to be longer
than 2 m.
The instrument can be so influenced by electrostatic charges
and other electromagnetic phenomena (HF, bursts, indirect
lightning discharges) that it no longer works within the given
specifications. Carry out the following measures to reduce or
eliminate the effect of such disturbance: Ensure potential
equalization at the PC (especially with Laptops). Use screen-
ing. When a total failure of the instrument occurs, unplug it
and plug it back in again for a reset.
5 HANDLING
This section describes the start-up of the sensor and the re-
cording of measurement data. Please read this section thor-
oughly in order to avoid failures or operating errors.
5.1 Start-up
Switch the sensor on by pressing the on-button for more than
3 seconds. The Bluetooth LED lights up red. Start the soft-
ware and select the sensor.
There is a 9-digit code
on the back of the sen-
sor (Fig.2). The last 4
digits of the code cor-
responds to the last
four digits of the sensor
name in the software
(Fig.3).
Fig.2
This allows an exact
assignment of the
sensors with the soft-
ware.
Fig.3
After the sensor has been selected in the software, the LED
flashes green to indicate a correct connection.
If the sensor is switched on and not connected, it switches off
automatically after 5 minutes.
Connect the supplied potassium electrode PK-2-004 to the
BNC connector of the sensor.
Fig.4
5.2 Preparation
Important: The indicated molar masses refer to sub-
stances in the anhydrous state!
Preparation of the activation solution:
1 M KCl (one molar potassium chloride solution), 2.5 M
MgAc2(two and a half molar magnesium acetate solution)
and H20 deionised are required as stock solutions.
The concentration of the activation solution should be 1 mM
KCl, 50 mM MgAc2. Due to the strong dilution of the electro-
lyte solution we recommend to prepare it in larger quantities.
For the preparation of 1 litre electrolyte solution you need:
•979 ml H20 deionised
•1 ml 1 M KCl
•20 ml 2.5 M MgAc2
•
Remove the protective cap from the lower end of the elec-
trode. The electrode must be immersed in the activation solu-
tion for more than 2 hours before use. Make sure that the
lower part of the electrode does not rest on the bottom of the
container, this may damage the electrode.
Rinse the electrode in deionised water.
The electrode can be stored permanently in the activation
solution.
5.3 Calibration
Perform a 2-point calibration using measureAPP. Use 350
mg/l for the 1st measuring point and 3500 mg/l for the 2nd
measuring point. Use a magnetic stirrer with uniform stirring
speed for uniform mixing.
You need a strengthening solution to prepare the calibration
solution and to carry out measurements. For the preparation
of 1 litre of strengthening solution you need:
•1000 ml H20 deionised
•186.38 g magnesium acetate

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Recipe for calibration solutions:
To prepare 1 litre of calibration solution you will need:
•950 ml H20 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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iOS
Android
Windows
9 CONFORMITY
10 DISPOSAL
The packaging mainly consists of environmentally-friendly
materials that should be returned to the local recycling sta-
tions.
PHYWE Systeme GmbH & Co. KG
Abteilung Kundendienst
Robert-Bosch-Breite 10
D–37079 Göttingen
Telefon [phone]
Fax [phone]
Do not dispose of this product with normal
household waste. If this unit needs to be
disposed of, please return it to the address
that is stated below for proper disposal
PHYWE Systeme GmbH & Co.KG hereby
declares that the radio system type 12916-
00 complies with the 2014/53/EU directive.
The complete text of the EC Declaration of
Conformity is available at the following In-
ternet address:
www.phywe.com/en/ec-declaration