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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 chloride ion-selective electrode (PCI-2-
010) 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 sensor
(Fig.2). The last 4 digits of
the code corresponds to
the last four digits of the
sensor name in the soft-
ware (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 chloride electrode PCI-2-010 to the
BNC connector of the sensor.
Fig.4
5.2 Preparation
Stock solutions: 1 M KCl, 5 M NaNO
3
, H
2
O deionized.
The activation solution for the sensor can now be set from
the stock solutions.
Activation solution: 1 mM CaCl
2
, 80 mM KCl
Dilution scheme:
1 M KCl
0.05 ml
5 M NaNO
3
(strengthening solu-
tion)
1.0 ml
H2O deionized
48.95 ml
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, as this can damage the electrode.
Rinse the electrode in deionized water.
5.3 Calibration
Perform a 2-point calibration using measureAPP. Use the
smallest specified measuring range of the sensor for the 1st
measuring point and the largest specified measuring range
value for the 2nd measuring point. The calibration solutions
are prepared from the stock solutions, whereby the strength-
ening solution is added by a factor of 1:50. For uniform mix-
ing, use a magnetic stirrer with uniform stirring speed.
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.
