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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.
Measurement
The weighing module is a function which allows the user to perform simple weighing tasks.
Measurement in manual mode:
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.
Measurement in “PC“ mode:
In PC mode , the weighing function could be used together with the heating and stirring functions. You can activate this feature by
following below steps:
1. Connect the device via RS 232 or USB cable to a computer.
2. Enter “PC” mode: Use either the “START_1”, “START_2” or “START_4” command to enable “PC” control (“PC” symbol appears).
3. Start weighing function / Tare: Use the “START_90” command to start the weighing function or tare the weighing value.
(
Note:
Make sure that the stirring function is deactivated or set to 0 rpm before activating the weighing function.)
4. Check the weighing status: Use the “STATUS_90” command to check if the weighing function is ready to use. When the read back
value is “1041 90”, the weighing function is ready. Otherwise please wait for a few seconds.
5. Read the weight value: Use the “IN_PV_90” command to read out the weight value.
6. With the weighing function activated, the heating and / or stirring can be started or stopped with the corresponding NAMUR
command (“START_X”, “STOP_X”, “OUT_SP_X n”).
7. Exit “PC” mode: Stop the weighing function with the “STOP_90” command. The heating and stirring functions can be stopped
afterwards. The device will exit the “PC” mode (“PC” symbol disappears).
Note:
You have to start weighing and taring before you start heating and stirring.
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 closing calibration mode.
Once the calibration process has been completed successfully, the weighing module is ready for use.
Regularly re-calibrate the device.
Weighing
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.
Timer
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 pH
4, pH5 and pH7 buffer 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 permissible 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.
pH probe
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).
Mode C
In this mode, the device can be used either with or without a temperature sensor.
When the device is switched on using the main switch, the stirring and heating functions are started in the last set status and at the last
set values. The set nominal values in operating modes A and B cannot be modified.
Mode
