Dupla Twin-Control Fiche technique

www.dupla.com

Dohse Aquaristik GmbH & Co. KG

Item no. 80288 · Status: 03/2013 ·Version: 1.1

Twin-Control

Dohse Aquaristik GmbH & Co. KG · www.dohse-aquaristik.com

Using instruction

Summary

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1

Control units and connection strips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2

Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3

Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4

Assembly advice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2. Description of the basic functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1

Function monitoring of external devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2

Safety shutdown during programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.3

Overwrite function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.4

Safeguard function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.5

Interval reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.6

Return function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.7

Memory function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.8

Malfunction display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3. Description of the programmable functions. . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1

Clock programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1.1 Time setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2

Temperature 1 programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2.1 Choice of HEAT / COOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2.2 Setting the temperature 1 value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2.3 Alarm setting temperature 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2.4 Deactivation/activation of the audible temperature 1 alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3

pH programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3.1 pH set point programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3.2 CO2-night off function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3.3 pH alarm programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3.4 Deactivation/activation of the audible pH alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3.5 Calibration pH electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3.6 Calibration reminder function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.4

Temperature 2 programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.4.1 Choice of HEAT / COOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.4.2 Setting as second temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.4.3 Alarm setting temperature 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.4.4 Deactivation/activation of the audible temperature 2 alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.4.5 Setting as ﬁrst temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.5

Timer programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.5.1 Setting the timer control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.5.2 Programming turn-on and turn-off times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.5.3 Programming interval control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.6

Manual activation/deactivation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.7

Display light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.8

Calibration of the temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4. Quick start guide to programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5. Programming Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.1

Clock programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.1.1 Time setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.2

Temperature 1 programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2.1 Choice of HEAT / COOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2.2 Setting the temperature 1 control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2.3 Setting the temperature 1 value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.4 Alarm setting temperature 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.5 Deactivation/activation of the audible temperature 1 alarm. . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.3

pH programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.3.1 pH set point programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.3.2 CO2-night off function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.3.3 pH alarm programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.3.4 Deactivation/activation of the audible pH alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.3.5 pH electrode calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.3.6 Calibration reminder function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.4

Temperature 2 programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.4.1 Choice of HEAT / COOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.4.2 Setting as second temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.4.3 Alarm setting temperature 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.4.4 Deactivation/activation of the audible temperature 2 alarm. . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.4.5 Setting as ﬁrst temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.5

Timer programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5.5.1 Setting the timer control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5.5.2 Programming turn-on and turn-off times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.5.3 Programming interval control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.6

Manual activation/deactivation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.7

Display light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.8

Calibration of the temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6. Reset to factory presetting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7. Factory presetting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

8. Sources of faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

9. Technical speciﬁcations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

10. EC declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2 x

1. Introduction

1.1 1.1 Control unit and connection strip

Connection strip

LED

Slot 1 for control of temperature 1

(HEAT / COOL) / pH

Slot 2 for control of temperature 2

(HEAT / COOL) / timer

Connecting cable

Fastening rail

Set of screws for fastening rail

Cable tie

Suction element for ﬁxing the sensor

Control unit

Temperature sensor

BNC connector

1.2 Display

pH pH

= Displaying measured Temperature 1 or pH

= Displaying measured Temperature 2 or Time

= Displaying set pH or Temperature 1

= Displaying set Temperature 2 or Time

= Displaying current time

= pH (slot 1, alternative to Temperature 1)

= Temperature 1 (slot 1, alternative to pH)

= Temperature 2 for slot 2, when slot 1 is Temperature 1 control

= Timer (slot 2, alternative to Temperature 2)

= Calibration

= Set values

= Symbol for heating mode

= Symbol for cooling mode

= Symbol for CO2supply

= Symbol for alert (ﬂashes simultaneously with pH or °C in case of alert

or ﬂashes simultaneously with CAL to remind of the pH electrode calibration)

1.3 Safety instructions

The Dupla Twin-Control pro is designed exclusivly for use in enclosed rooms. All electronic components of the device

must only be operated whilst they are free from defects. Should the mains supply be damaged, please return to your

dealer for repair. Continued operation of the device may cause fatal injury from an electric shock. Ensure that the

control unit and connection strip can not come into contact with water.

Technical products must only be operated as supplied. Electronic components must not be modiﬁed in any way, and

the leads must not be shortened. Covers or housings must not be opened. If the product is damaged cease useage or

shut down immediatly by pulling the mains plug.

1.4 Assembly advice

Control units

The reverse side of the control unit has recesses that are used to lock the fastening rail which is ﬁxed to the wall or

the aquarium cabinet with the screw set. The cable to the control unit has a USB connector so that holes of control

unit dimensions do not need to be sawn out of the terrarium cabinet. The USB connector is not designed for a compu-

ter connection. The control unit has a 2 metre cable which permits installation outside the aquarium cabinet as well

as an unobstructed view of all values and status modes.

Connection strips

The connection strip should be screwed to the back or side panel inside the aquarium cabinet to ensure that there is

no contact with the unit in the event of water leakage.

BNC connector

The Dupla Twin-Control system is equipped with a BNC connector for pH electrodes.

Temperature sensors

Position the temperature sensor at a place inside the aquarium with good water ﬂow. It should not be installed near

the heater. Fasten it in a manner which prevents the sensor from coming loose and ensures it is always completely

submerged. Otherwise, incorrect readings and an overheating of the aquarium could be the result. For easy replace-

ment in case of malfunction the temperature sensor is connected to the control unit with an USB plug.

2. Description of the basic functions

2.1 Function monitoring of external devices

The housing is ﬁtted with LEDs. In operating mode this indicates the active control of the external device.

2.2 Safety shutdown during programming

When entering into programming mode, both slots are deactivated for safety reasons.

2.3 Overwrite function

On slot 1 either pH control or temperature control can be selected. Any previously entered temperature values are

deleted by the pH settings and vice versa.

On slot 2 either temperature 2 control or time control can be selected. Any previously entered temperature 2 values

are deleted by the timer settings and vice versa.

2.4 Safeguard function

To protect electronic components, a delay of 60 seconds is set between 2 switching states before the respective slot

becomes active again.

2.5 Interval reset

Irrespective of the time of day, all programmed intervals start when the device is switched on or the menu is quit.

2.6 Return function

The Dupla Twin-Control pro automatically returns to operating mode when no button has been pressed for a period of

90 seconds while in the programming mode.

2.7 Memory function

To safeguard against loss of data in the event of a power failure, the Dupla Twin-Control stores the set values for pH

regulation, temperature control and time periods. The unit will continue to calculate the time for up to ﬁve hours after

such an event, so the clock does not need to be reset after brief power failures.

2.8 Malfunction display

A not connected temperature sensor, a not connected pH-electrode, a sensor fault or short circuit of the temperature, a

pH-electrode defect or programming error in the time settings will be indicated as an error, see item 8 of this instruction.

For safety reasons in such an event the slots will be deactivated, for example to to prevent overheating of the aquarium.

Despite this safety measure, it is still advisable to only use submersion tube heaters with integrated thermostat and

safety cut-out function.

3. Description of the programmable functions

Slot 1 can be programmed for pH control or temperature control. Slot 2 can be programmed for (second) temperature

control or timer switch. This allows eight different combinations when using the Dupla Twin-Control for one or two

different aquaria.

• pH regulation + water heating (slot 1: pH / slot 2: Temp

HEAT)

• pH regulation + water cooling (slot 1: pH / slot 2: Temp

COOL)

• pH regulation + timer switch (slot 1: pH / slot 2: Time)

• water heating + substrate heating (slot 1: Temp

HEAT / slot 2: Temp

HEAT)

• water heating + water cooling (slot 1: Temp

HEAT / slot 2: Temp

COOL)

• water heating + timer switch (slot 1: Temp

HEAT / slot 2: Time)

• water cooling + timer switch (slot 1: Temp

COOL / slot 2: Time)

• water cooling + water cooling (slot 1: Temp

COOL / slot 2: Temp

COOL)

In programming mode, the functions can be conﬁgured in the following sequence:

3.1 Clock programming

3.1.1 Time setting

The factory presets the time at . The time setting however is not cleared during a resetting procedure.

3.2 Temperature 1 programming

3.2.1 Choice of HEAT/COOL

A convenient inversion function makes it possible to switch from HEAT to COOL . This permits connection to an

external cooling device instead of a heater to counteract any increase in temperature.

3.2.2 Setting the temperature 1 value

The temperature is regulated to a precision of 0.1 °C. The temperature can be set within the range of 10 °C – 40 °C.

The factory presets the temperature to 24 °C. It is possible to programme two turn-on/turn-off times to simulate the

drop in temperature at night. The Dupla Twin-Control pro has an automatic sorting function which will re-arrange the

time periods to the correct sequential order when exiting programming mode.

3.2.3 Alarm setting temperature 1

A visual alarm indicated by ﬂashing if the temperature exceeds or drops below the programmed desired tempe-

rature 1 values. The factory setting is 0.0 (no alarm). An alarm window between +/- 0.1 °C and 10 °C can be set.

Example: Temperature 24 °C, alarm window +/- 2 °C means that an alarm is triggered below 22 °C and above 26 °C.

3.2.4 Deactivation/activation of the audible temperature 1 alarm

The audible alarm can be switched or . The factory setting is , as otherwise an alarm could be trigge-

red immediately when the system is ﬁrst put into service when the sensor is located outside the aquarium, where the

temperature may be either too high or too low.

3.3 pH programming

3.3.1 pH set point programming

The pH set point can be adjusted within the limits of 4.0 – 9.9. If the measured pH value is outside the display range,

values lower than 4.0 are displayed as , values higher than 9.9 are displayed as . Outside of these limits,

the pH channel is switched off. The pH-controlled CO2fertilisation is carried out through permanent measuring by a

connected Dupla pH electrode and switching of a connected Dupla CO2magnetic valve with a switch hysteresis (the

difference between the switching point and the triggering point) of 0.1 pH and a control accuracy is +/- 0.1. The

switch hystereris is pH 0.1, and the control accuracy is +/- 0.1 (reference value). In order to ensure the accuracy of

measurement and therefore the control circuit, the Dupla Twin-Control pro provides an optional six-week calibration

memory function

Please note: If no pH electrode is connected to the Dupla Twin-Control pro, so that the BNC socket is open,

ﬁctitious pH values will be displayed.

3.3.2 CO2-night off function

This enables interruption of the CO2supply, controlled by a magnetic valve, into your aquarium during the night if

desired. The beginning and end times of the interruption during the night can be choosen after programming the pH

Set point.

3.3.3 pH alarm programming

A visual alarm indicated by ﬂashing if the temperature exceeds or drops below the programmed desired pH values.

The factory presetting is , which means no alarm. The alarm window can be set between a pH 0.1 and 4.0 deviati-

on from the set point.

3.3.4 Deactivation/activation of the audible pH alarm

The audible alarm can be switched or . The factory setting is , as otherwise an alarm could be trigge-

red immediately when the system is ﬁrst put into service when the electrode is still located outside the aquarium or

not yet calibrated.

3.3.5 Calibrate pH electrode

The factory setting of the calibration points are pH 7, pH 4 and pH 9, the calibration sequence is ﬁrst pH 7, then pH 4

or pH 9. The calibration process can be cancelled by pressing the ▲and ▼buttons simultaneously.

3.3.6 Reminder of calibration function

With this feature enabled, every six-weeks

CAL

and ﬂash on the display as a reminder to check the pH electrode

calibration. For a period of 10 seconds you will hear a beep every 2 seconds. This will be repeated every hour.

If you prefer not to carry out a calibration, the memory display clears after activating any button and reappears in

another 6 weeks.

In order to calibrate the pH electrode, enter programming mode by pressing the button and follow item 5.3.4 of

the instructions.

To disable of the calibration memory function, continue to scroll through the menu items and set the function to

3.4 Temperature 2 programming

3.4.1 Choice of HEAT/COOL

A convenient inversion function makes it possible to switch from HEAT to COOL. This permits connection to an exter-

nal Cooling device instead of a Heater to counteract an increase in temperature.

3.4.2 Setting as second temperature

When slot 1 is programmed for temperature (water heating), then in HEAT mode the temperature 2 (substrate hea-

ting) on slot 2 is ﬁxed to 0.1 °C higher.

Example: You have set the water temperature to 25.0 °C. When 25.0 °C is measured, slot 1 (water heating) is

switched off. The substrate heating remains active. If the substrate heating system is so powerful that 25.1 °C is

measured, slot 2 (substrate heating) is also switched off.

Hint: A warm substrate strengthens the roots of plants, encourages biological substrate activity and generates

a circulation in the substrate to improve the transport of oxygen and nutrients. This provides the best possible

conditions for healthy plant growth.

In COOL mode the temperature 2 (water cooling) on slot 2 is adjustable to a 0.1 and 5.0 °C difference to

temperature 1.

Example: You have set the temperatur 1 on slot 1 to a heating temperature of 25.0 °C and the difference of

temperatur 2 to temperature 1 for a cooling device on slot 2 to 3 °C. When a temperature less than 25.0 °C is

measured, water heating on slot 1 remains switched on, slot 2 switched off. When a temperature above 28.0 °C

is measured, water cooling on slot 2 is switched on, slot 1 is switched off.

Hint: Submersion tube heaters with a thermostat should be set 3 – 4 °C higher than the desired temperature to

ensure correct operation of electronic control via the Dupla Twin-Control.

3.4.3 Alarm setting temperature 2

A visual alarm indicated by ﬂashing if the temperature exceeds or drops below the programmed desired tempe-

rature 2 values. The factory setting is (no alarm). An alarm window between +/- 0.1 °C and 10 °C can be set.

Example: Temperature 25 °C, alarm window +/- 3 °C means that an alarm is triggered below 22 °C and above 28 °C.

3.4.4 Deactivation/activation of the audible temperature 2 alarm

The audible alarm can be switched or . The factory setting is , as otherwise an alarm could be trigge-

red immediately when the system is ﬁrst put into service when the sensor is located outside the aquarium, where the

temperature may be either too high or too low.

3.4.5 Setting as ﬁrst temperature

In the case that switch number 1 is programmed as pH control, the temperature can be used for 2 optional water

heating or cooling.

3.5 Timer programming

3.5.1 Setting the timer control mode

As an alternative to temperature regulation, the second slot can be used to control external devices via a timer switch

with a one-second control interval. Selection is between (external device at slot 2 is permanently activated),

(automatic modus) and (interval mode).

3.5.2 Programme turn-on and turn-off times

If Automatic Mode is selected up to 8 turn-on/turn-off times can be programmed. (The Dupla Twin-Control has an

automatic sorting function which will re-arrange the time periods into the correct sequential order when exiting the

programming mode.)

3.5.3 Programme interval control

If the Interval mode is selected external devices are switched on for a minimum of 1 second (maximum 23 hrs., 59

min. and 59 sec.) and switched off for a minimum of 30 minutes (maximum 96 hrs. and 59 min.).

3.6 Manual activation/deactivation

Both slots can be turned on and off manually by combination of buttons to be pressed.

3.7 Display light

Factory presetting is an automatic adaptation of the display light. After pressing any button the display light is

switched on. When no button has been pressed for 120 seconds, the display light is automatically dimmed down. It is

possible to change from automatic light dimming to full illumination of the display.

3. 8 Calibration of the temperature sensor

The temperature sensors has a tolerance of +/-0.5 °C. To compensate any possible deviation in comparence to an

external reference meter, a calibration is possible.

Table des matières

Autres manuels Dupla Instrument de mesure

Dupla

Dupla pH-Control Pro Manuel utilisateur

Manuels Instrument de mesure populaires d'autres marques

Suaoki

Suaoki D40 Manuel utilisateur

Elster

Elster BK-G1.6 Manuel utilisateur

Endress+Hauser

Endress+Hauser Deltabar FMD71 Manuel

Duratool

Duratool D03128 Manuel utilisateur

Vega

Vega VEGAPULS 65 Manuel utilisateur

Tonghui

Tonghui TH2618B Manuel utilisateur

Tenmars

Tenmars TM-801 Manuel utilisateur

MSR

MSR 145 Manuel utilisateur

TPS

TPS WP-82 Manuel utilisateur

ELMETRON

ELMETRON CP-511 Manuel utilisateur

PCB Piezotronics

PCB Piezotronics 003C30 Manuel utilisateur

Tenma

Tenma 72-10465 Manuel utilisateur

Endress+Hauser

Endress+Hauser Proline Promag 50 Caractéristiques techniques

Siemens

Siemens SITRANS F Coriolis FCT030 Manuel de la liste des pièces

KLINGER

KLINGER CMF V Series Manuel utilisateur

EXFO

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