IKA RET control-visc Mode D'emploi page 28

Temperature sensor
Calibration:
In order to use tolerances to limit temperature deviations, the
user can calibrate the temperature sensor in conjunction with the
device.
2-point calibration:
Calibration using two temperatures
3-point calibration:
Most accurate way of calibrating the temperature sensor at three
different temperatures
Note:
A calibration carried out by the user is indicated on the display with
the symbol (11) shown in red. The calibration of the PT100 and
PT1000.50 double sensor are carried out separately.
Reset calibration:
The menu allows the user to reset the calibration for the
temperature sensor.
Weighing
Measurement
The weighing module is a function which allows the user to
perform simple weighing tasks.
To start the weighing process, press the (G) button on the front
membrane or alternatively select "Weighing" from the menu. Press
the rotary knob (D) to start the weighing function.
Note:
The heating and stirring functions must be deactivated.
It may take several moments for the system to stabilise.
Once the system is stable, a "g" will be shown alongside the
measured value.
Calibration
Place the calibration weight on the mounting plate and wait
until the device indicates that the calibration process has been
completed.
This process needs to be repeated two or three times before clo-
sing calibration mode.
Once the calibration process has been completed successfully, the
weighing module is ready for use.
Regularly re-calibrate the device.
Timer
Set
The Timer function allows the user to stop the heating process
after a certain time has lapsed. The Timer function can be set for
up to 99 hours, 59 minutes and 59 seconds.
Note:
The time starts to count down when starting both functions
(heating and/or stirring).
Once the heating function is activated, the timer function only
refers to heating. The stirring function continues to operate as
previously, thereby avoiding a delay in boiling in the liquid. The
motor is only switched off when the heating function is not active.
The stirring function is stopped if the heating function is not started
during the timer cycle and the time runs out.
Note:
By entering a value of 00:00:00 (hh:mm:ss), the counter is
activated. The counter shows the time elapsed during the current
experiment.
Display
The menu allows the user to specify that the "Timer" is shown on
the display. A tick shows that the option is activated.
pH probe
Calibration
The device has an integrated pH measuring feature for determining
the pH of different liquids.
The pH sensor must be calibrated before being used to attempt a
pH measurement.
The calibration is used to adjust the pH probe and the device
so that they work together correctly. As part of the process,
the neutral and pH gradient are specified for the measurement
chain. To complete the calibration, use
solutions in accordance with DIN 19266.
Note:
a pH calibration can only be carried out with an inserted
temperature sensor.
• Scroll down to the "pH probe" icon in the menu
• Open the submenu by pressing the rotary knob (D)
• Open the "Calibration" submenu and confirm by pressing the
rotary knob (D)
• Place the pH probe and temperature sensor in the required buffer
solution.
• Once the value is stable, confirm it by pressing the rotary knob
(D).
• Follow the instructions on the display and place the pH probe
and temperature sensor in the next buffer solution.
• Confirm once more the value displayed.
• In the case of a 3-point calibration, a third buffer solution must
be used.
pH measurements can be carried out once the calibration has
been completed successfully.
Note:
The use of the temperature sensor is limited by the maximum per-
missible temperature.
Ensure that the temperature of the liquid does not exceed the
maximum permissible temperature.
Display
The menu allows the user to specify that the "pH probe" is shown
on the display. A tick shows that the option is activated.
Mode
The set mode is shown permanently on the display (10).
Mode A
All the settings are retained when the device is switched off or
disconnected from the mains. When the device is switched on, the
status of the stirring and heating functions is set to (OFF).
Mode B
All the settings are retained when the device is switched off or
disconnected from the mains. When the device is switched on, the
status of the stirring and heating functions is set to whatever it was
before the device was last switched off (ON or OFF).
pH4, pH5 and pH7 buffer
28