PHYWE Cobra SMARTsense Skin Resistance User manual

1
www.phywe.com, © All rights reserved 12942-00 / 0920
Operating
instructions
Cobra SMARTsense Skin Resistance
12942-00
PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10
D–37079 Göttingen
Telefon [phone]
Fax [phone]
E-mail [email protected]
Internet www.phywe.de
The unit complies
with the applicable
EC-guidelines
Fig. 1: 12942-00 Cobra SMARTsense Skin Resistance
TABLE OF CONTENTS
1SAFETY PRECAUTIONS
2PURPOSE AND CHARACTERISTICS
3FUNCTIONAL AND OPERATING ELEMENTS
4NOTES ON OPERATION
5HANDLING
6TECHNICAL DATA
7SCOPE OF DELIVERY
8ACCESSORIES
9 CONFORMITY
10 DISPOSAL
11 SYMBOL DESCRIPTION
1 SAFETY PRECAUTIONS
Do not use Cobra SMARTsense Skin Resistance if a
device connected to it is connected to the mains
voltage!
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.
Take care that no liquid penetrates in through the hous-
ing openings, as such penetration would result in dam-
age to Sensor.
Do not open the unit.
2 PURPOSE AND CHARACTERISTICS
The sensor is used for measuring the respiratory volume and
volumetric flow rate and for transferring the values to a termi-
nal device, e.g. a tablet computer, smartphone, etc., via Blue-
tooth or USB.
The sensor is neither suitable nor approved for medical pur-
poses. It is intended solely for didactic purposes. This device
must not be used for defined measurements on humans in
order to diagnose an illness or disease, i.e. it is not intended
Caution!

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www.phywe.com, © All rights reserved 12936-00 / 0920
for monitoring, treating or alleviating illnesses or diseases. As
a consequence, it is not subject to the strict constraints of the
Medical Devices Act.
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
To switch the sensor on and off in Bluetooth mode, the power
button must be pressed for longer than 3s. If the sensor is to
be connected via USB, it is not necessary to press the power
button.
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 2 seconds
Low battery
Illuminated red
Active charging process
Illuminated red
Charging process
completed
3.2 USB port
The battery, which is permanently installed in the sensor, is
charged via the type C USB port. Furthermore, communica-
tion with a computer takes place via this interface.
4 NOTES ON OPERATION
For safety reasons, the Cobra SMARTsense sensor may only
be used when the sensor is not connected to mains voltage!
To do this, make sure that either
a) The Cobra SMARTsense sensor is not connected to
a charger via USB.
b) If a USB connection to a laptop is established, it is
used in battery mode with the power supply discon-
nected, or
c) If there is a USB connection to a standard PC or
laptop with a power supply unit, these are con-
nected to the mains voltage via a floating isolating
transformer.
This 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 on the sensor by pressing the power button for more
than 3s. Now the Bluetooth LED flashes red. Start the soft-
ware and select the sensor.
If the sensor is to be used via the USB interface, it does not
need to be switched on. The sensor is connected directly to
the end device using the supplied USB cable.
There is a 9-digit code
on the back of the
sensor (Fig.2). The
last 4 digits of the
code are displayed as
the sensor name in the
software (Fig.3). This
enables the precise
assignment of the
sensors within the
software.
Fig. 2
Fig. 3
Selection of the sensor via the Bluetooth interface
Make sure that the Bluetooth interface is activated on the
terminal device (PC/Tablet/Smartphone) and that the soft-
ware is allowed to access the interface.
After the sensor has been selected in the software, the LED
flashes green to indicate that the connection has been estab-
lished correctly. After the sensor has been coupled with the
software, the sensor is no longer visible to other users in the
software, and therefore can no longer be selected.
If the sensor is switched on and not connected, it switches off
automatically after 5 minutes.
Selection of the sensor via the USB interface
For this purpose the sensor must be plugged into the USB
port of the end device. It is not necessary to switch on the
sensor. The sensor is automatically recognized and dis-
played. It can be selected and connected directly.
Connecting the electrodes
Attach the disposable electrodes firmly to two fingers. The
electrode should be on the fingertip. The exact location of the
sensors is shown in Figure 2.
Fig. 2

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www.phywe.com, © All rights reserved 12936-00 / 0920
5.2 Recording of measurement data
Measuring principle
A constant voltage is applied between the two electrodes.
The current flowing between the two electrodes is directly
proportional to the conductivity of the skin or indirectly pro-
portional to the skin resistance. This current is detected by
the sensor and translated into a voltage signal.
The electrical conductance (G) given in the Siemens unit is
the reciprocal of the resistance (R).
Measurement
Start a measurement with measureAPP to see the course of
the skin resistance.
Calibration
The sensor must be calibrated separately for each person, as
the neutral skin conductance differs from person to person.
After the electrodes have been attached to the fingers, the
software can be used to check when a constant value is
reached. After a test, a measurement or a question, the pa-
tient waits until the person-specific neutral skin conductance
value is reached again. Only then is a new series of meas-
urements taken.
For simplification and better application, the value should
therefore be marked with the menu item "Set to zero".
Tip: The neutral skin conductance value should not be too
low, otherwise a measurement will take an unnecessarily
long time. Even a quiet environment or an armchair simplify
relaxation.
5.3 Charging process
Use a USB-C cable to connect the sensor to a computer or
USB charger (not included).
During the charging process, the battery charge LED lights
up red. When the charging process is complete, the battery
charge LED lights up green. The charging time for a com-
pletely discharged battery is 3 hours maximum.
Disconnect the charger at the latest four hours af-
ter the completion of the charging process. Other-
wise, the service life of the battery may be nega-
tively affected.
6 TECHNICAL DATA
Operating temperature range: 5 - 40°C
Rel. humidity < 80%
Measuring Range
Resolution
0 … 10 µS
0,01 µS
Max. Samplerate
Battery capacitiy
Max. wireless range (open field)
Dimensions (length x width x height)
100 Hz
250 mAh
30 m
105 x39 x26 mm
Weight
59 g
7 SCOPE OF DELIVERY
The extent of delivery is as follows
Cobra SMARTsense Skin Resistance 12942-00
Electrode connection cable
6 EKG electrodes
USB cable type C 07935-00
Operating instructions
8 ACCESSORIES
USB-charger 07934-99
Set with 20 Selfsticking Electrodes 12929-00
USB-Bluetooth-Adapter 07936-00
Software measureLAB 14580-61
Free measureApp available from supplier portals
iOS
Android
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]
11 SYMBOL DESCRIPTION
Caution!
Potentially harmful situation
(damage of property)
Generally dangerous spot
Follow operating instructions
Note
Important device information
Follow operating instructions
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 12942-
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