Sample Plates Of The Tw Alpha Plus; Built-In Magnetic Stirrer Built-In Magnetic Stirrer; O Port Of The Tw Alpha Plus Titration Sample Changer; General I/O Description - SI Analytics TW alpha plus Operating Manual

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Sample plates of the TW alpha plus

Four sample plates are available for the TW alpha plus Titration Sample Changer:
TZ 1452 sample plate: 12 samples 250 ml low shape, 400 ml high shape
TZ 1459 sample plate: 16 samples
TZ 1454 sample plate: 24 samples
TZ 1444 sample plate: 24 samples COD reaction vessel according to DIN 38 409, Part 41
Sample plate : 48 samples
On the back panel of the TW alpha plus Titration Sample Changer there is a stage switch inscribed
"Proben/Samples" ( Fig.1, Pos. 4). This switch is used to communicate the sample plates used to the
Sample Changer. Using a small screw driver, this switch can be set to the corresponding size.
Here is: 0 = 12 samples
1 = 16 samples
2 = 24 samples
4 = 48 samples
This setting can also be made via software using the appropriate commands from a connected computer or
titration device ( section 7).
The sample plates are set on clock-wise according to the mark engraved on the sample changer. The
connection with the Sample Changer is made by simply placement on the corresponding driving cone. In
this process, the sample plate is to be rotated until it latches. To remove the sample plate, just lift it a little bit
up.
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Built-in magnetic stirrer Built-in magnetic stirrer

The Sample Changer is equipped with a built-in magnetic stirrer. If the TitroLine
PC Software is used, for instance, this stirrer can be switched on and off via the RS-232-C interface 1.
At the start of titration, the speed set in the method will be transferred. The stirrer will start running at that
speed. When setting the stirring speed, please do not select any setting below 10 seconds.
It the stirring speed is to be controlled by the titration unit, please make sure that the setting knob is set to
full stirring speed, otherwise the max. possible stirring speed will be limited in accordance with the stage set
on the setting knob. The desired stirring speed can then be fine-adjusted using the rotary knob on the back
panel of the sample changer.
5 I/O port of the TW alpha plus Titration Sample Changer
5.1

General I/O description

The TW alpha plus Titration Sample Changer is equipped with a 15-channel plug connector for connecting
pump and valve modules. This I/O port can be used to connect the available devices via a cable ( Fig. 1,
item. 9). This I/O port is controlled by the computer software. A total of 4 outputs and 5 inputs is available.
For the required commands, please refer to the command list ( section 7).
5.2

Electrical properties of the I/O port

The in- and outputs of the I/O port are galvanically isolated from the electronics of the titration sample
changer by optocouplers of the HCPL-0700 type. No direct circuiting of power consumers is possible.
The pump and valve modules available from SI Analytics
cable.
100 ml to 150 ml, high and low shape, 250 mm high shape
50 ml, high shape
Available as a special version upon request.

can be connected directly to the I/O unit using a
®
7000, 7750 and 7800 or a
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