PHYWE Cobra SMARTsense Ammonium Ion 12913-00 User manual

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www.phywe.com, © All rights reserved 12913-00 / 0222
Operating instruc-
tions
Cobra SMARTsense Ammonium Ion
12913-00
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: 12913-00 Cobra SMARTsense Ammonium 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 ammonium 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 ammonium ion-selective electrode (PNH3-
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. Star the soft-
ware and select the sensor.
There is a 9-digit code
on the back of the sensor
(Fig.2). The last 4 digits
of the code corresponds
to the last four digits of
the sensor name in the
software (Fig.3).
Fig.2
This allows an exact
assignment of the sen-
sors with the software.
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 ammonium electrode PNH3-2-004 to
the BNC connector of the sensor.
Fig. 4
5.2 Filling the conductive liquid into the electrode
Important: The indicated molar masses refer to sub-
stances in the anhydrous state!
Before using the electrode for the first time, it must be filled
with the electrolyte solution supplied. Dilute the powder in the
container with 30 ml of deionised water.
Alternatively, you can prepare the electrolyte solution your-
self.
Preparation of the electrolyte solution:
1 M NaCl (one-molar sodium chloride solution), 1 M NH4Cl
(one-molar ammonium chloride solution) and H20 deionised
are required as stock solutions.
The concentration of the electrolyte solution should be 10
mM NH4Cl. Due to the strong dilution of the electrolyte solu-
tion, we recommend preparing it in larger quantities. For the
preparation of 1 litre electrolyte solution you need:
•890 ml H20 deionised
•10 ml 1 M NH4Cl
•100 ml 1 M NaCl

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Proceed with the filling as described below:
1 = Diaphragm
2 = Sealing ring
3 = Front cap
4 = Electrode
5 = Outer shell
Fig.5
Unscrew the outer cover (5)
from the electrode (4) and
then also unscrew the front
cap (3) from the outer cover
(5).
Now check that the dia-
phragm (1) and the sealing
ring (2) are correctly seated.
The sealing ring must not be
twisted or inserted crookedly.
Fig.6
Now screw the front cap with inserted diaphragm and sealing
ring onto the outer casing(5) again.
Then carefully fill 7-8 ml of conductive liquid into the outer
casing(5) using the enclosed syringe.
Fig. 7
Now carefully push the electrode into the filled outer casing
and then turn the electrode with the outer casing (hand-tight).
ATTENTION: Please do not use any tool to tighten. This
may destroy the electrode or tear the membrane.
5.3 Activating the electrode
If the electrode is used for the first time or has not been used
for more than 1 week, it must be immersed in the activation
solution for 24 hours before use. Make sure that the lower
part of the electrode does not rest on the bottom of the con-
tainer, as this may damage the membrane. Then rinse the
electrode in deionised water.
The electrode can be stored permanently in the activation
solution.
Preparation of the activation solution:
1 M NH4Cl (one-molar ammonium chloride solution) and H20
deionised are required as stock solutions.
The concentration of the activation solution should be 10mM
NH4Cl. Due to the strong dilution of the activation solution,
we recommend to prepare it in larger quantities. For the
preparation of 1 litre activation solution you need:
•990 ml H20 deionised
•10 ml 1 M NH4Cl
5.4 Calibration
Perform a 2-point calibration using measureAPP. Use 160
mg/l for the 1st measuring point and 1600 mg/l for the 2nd
measuring point. The calibration solutions are prepared from
the stock solutions. Use a magnetic stirrer with uniform stir-
ring speed for uniform mixing.
Recipe for calibration solutions:
To prepare 1 litre of calibration solution you will need:
•1000 ml H20 deionised
•1600 mg ammonium chloride
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 1600 mg/l and 1000 ml calibration solution with 160 mg/l
available.
Hints:
- To ensure the measuring accuracy, the measuring
electrode should be immersed for 60 seconds in the
respective solutions at constant temperature, buffer
solution and stirring speed before calibration and
measurement. Between completion of calibration
and start of measurement, the electrode must be
immersed in the activation solution for at least 5
minutes.
- Before changing samples, the electrode should be
completely cleaned and the residual water carefully
dried to avoid cross-contamination between sam-
ples.
5.5 Measured value recording
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.
5.6 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.
1
2
3
4
5
1
2

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5.7 Possible sources of error.
1. If the electrode membrane is not mounted tightly,
measuring solution enters the inside of the electrode
and falsifies the measured values. Replace the
conductive liquid as described in 5.2.
2. Sediments settle on the electrode membrane and
block the membrane's function. Replace the memb-
rane and ensure careful cleaning and storage.
3. The service life of an ammonia electrode is approx.
1 year, regardless of use or storage. Older elec-
trodes may have an adverse effect on measure-
ments. Therefore, replace the electrode after ap-
prox. 1 year.
5.8 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. 8
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. 9.
Fig. 9
Insert new battery
Slide the battery under the golden metal nose (Fig.10-1).
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. 10-2), which is
also noticed by a short "click".
Fig. 10
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. 11
6 TECHNICAL DATA
Operating temperature range: 5 - 40°C
Relative humidity < 80%.
Measuring range
Resolution
Accuracy*
0.9… 1800 mg/l
0.5 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
97 g
7 SCOPE OF DELIVERY
The scope of delivery includes:
•Cobra SMARTsense Ammonium Ion 12913-00
•Ammonium Ion-selective electrode PNH3-2-004
•Instruction manual
8 ACCESSORIES
The following accessories are available:
•Button cell CR2032, 3 V 07922-15
•Cobra SMARTlink 12999-99
•Ammonium Ion-selective electrode
PNH3-2-004 12913-10
•Free measureApp available from supplier portals
iOS
Android
Windows
9 CONFORMITY
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PHYWE Systeme GmbH & Co.KG hereby
declares that the radio system type 12913-
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

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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