TW 7450 – XYZ Sample Changer for Piston Burettes and Automatic Titrators

The TW 7450 is a robust and sturdy sample changer particularly suitable for a large number of samples. The amount of samples in need of processing is growing constantly while at the same time the demands on reliability are increasing in accordance with GLP and ISO standards. The XYZ TW 7450 sample changer helps you meet these increased requirements and relieve qualified employees from routine work.

The control of the sample changer is carried out via the software TitriSoft. The TitriSoft titration software is the optimum solution for your titration tasks. The software supports your daily work procedures during sample preparation, titration and evaluation of results.

Exchangeable sample trays for more flexibility

With sample trays or racks for up to 72 samples (TW 7450) and titration head fittings for a variety of beaker and titrator vessels, you get the flexibility your lab needs.

The sample trays and titrator heads are very quick and simple to change. You can conveniently set the respective tray size in the TitriSoft software’s worklist without any need for configuration of the sample changer itself.

Rinsing of electrode and titration tip

To ensure the accuracy of the results, electrodes, and titration tips are rinsed after each titration. This can be done by immersing the electrodes and titration tips in a rinsing solution. How many rinsing positions are to be used and how long rinsing is to be carried out is defined in the worklist.

A direct and fast rinsing of the electrodes and titration tips can be carried out by connecting the MP 25 rinsing pump. This involves rinsing directly after the titration either into the titrated sample (TW 7200-16-MP, TW 7450-42-MP) or into a special rinsing vessel at position one (TW 745048-MP and TW 7450-72-MP). Finally, a waiting position can be approached to immerse pH electrodes in a KCl solution and prevent them from drying out.

By using an optional second pump, the titrated solution as well as the rinsing solution can be aspirated.

Photo on the left-hand side: The connection of a rinsing nozzle in the TZ 3974 titration head now also enables rinsing on the first position into a special rinsing vessel. The rinsing liquid drains from the rinsing vessel into a waste vessel by gravity.

Stirring “from above” or “from below”

With the TW 7450 sample changer stirring is generally “from above“.

TW 7450-48 and TW 7450-48 MP

The 48-position sample rack is suitable for 100 ml beakers and is ideal for use in wine, water, beverage and other applications.

TW 7450-42 and TW 7450-42 MP

The 42-position sample rack can be operated with either 150- or 250-ml beakers, sizes that are commonly used for water and environmental analysis amongst other applications. The matching titration heads are TZ 3963 and TZ 3967.

General Features TW 7450

Very fast and quiet during operation
Sample racks with 42, 48 and 72 positions and four different titration heads in different dimensions and holes can be used
Titration heads and sample racks can be changed in just a few steps. Switch sample racks via software TitriSoft
The usable sample vessels have a volume of 50 – 250 ml
Connection of one pump for rinsing and suction are possible (diaphragm and peristaltic pump). Additional pumps can be connected via the optional I/O box
The calibration of a pH electrode can also be done on the sample changer
Stirring is only possible from above with a rod stirrer (propeller stirrer).The rod stirrer TZ 1847 is included in the scope of delivery of the TW 7450- and TL 7000-TW 7450 sets

Ordering Information TW 7450 Sample Changers (Basic Unit)

Type No.	Order No.	Description
TW 7450	285221400	Basic TW 7450 unit without titration head and sample rack. With USB connection cable for PC connection, power supply 100-240 V
TW 7450-42-MP	285221450	Basic unit TW 7450 with sample rack TZ 3942 for 42 samples, titration head TZ 3967, rod stirrer TZ 1847, rinsing pump MP 25 and FEP-hose (5 m), 100–240 V
TW 7450-48	285221460	Basic unit TW 7450 with sample rack TZ 3948 for 48 samples, titration head TZ 3964, rod stirrer TZ 1847 and FEP-hose (5 m), 100–240 V
TW 7450-48-MP	285221470	Basic unit TW 7450 with sample rack TZ 3948 for 48 samples, titration head TZ 3964, rod stirrer TZ 1847 and FEP hose (5 m), 100–240 V
TW 7450-72	285221480	Basic unit TW 7450 with sample rack TZ 3972 for 72 samples, titration head TZ 3974, rod stirrer TZ 1847 and FEP hose (5 m), 100–240 V
TW 7450-72-MP	285221490	Basic unit TW 7450 with sample rack TZ 3972 for 72 samples, titration head TZ 3974, rod stirrer TZ 1847, Rinsing vessel TZ 3970, rinsing pump MP 25, and FEP hose (5 m), 100–240 V

Ordering Information TW 7450 Sample Changers (Basic Unit)

Type No.	Order No.	Description
TL 7000 TW 7450-42 Set	285221410	Complete sample changer set consists of TL 7000-M2-20, sample changer TW 7450, titration head TZ 3963, titration rack TZ 3942, rod stirrer TZ 1847, adapter TZ 1520, titration tube TZ 3425; with software TitriSof
TL 7000 TW 7450-42-MP Set	285221420	Complete sample changer set consists of TL 7000-M2-20, sample changer TW 7450, titration head TZ 3967, titration rack TZ 3942, pump MP 25, rod stirrer TZ 1847, adapter TZ 1520, titration tube TZ 3425; with software TitriSoft
TL 7000 TW 7450-72 Set	285221430	Complete sample changer set consists of TL 7000-M2-20, sample changer TW 7450, titration head TZ 3974, titration rack TZ 3972, rod stirrer TZ 1847, titration tip TZ 1646 titration tube TZ 3425; with software TitriSoft

Ordering Information TW 7450 Trays/Racks and Titration Heads

Type No.	Order No.	Description
TZ 4042	285217900	Sample rack for TW 7450, for 42 sample vessels, without beakers. Suitable beakers are 150 ml TZ 1784, TZ 1788 or 250 ml TZ 1787, TZ 1780.
TZ 4048	285217910	Sample rack for TW 7450, for 48 sample vessels, without beakers. Suitable beakers are TZ 1765 (100 ml tall form without spout).
TZ 4072	285217920	Sample rack for TW 7450, for 72 sample vessels, without beakers. Suitable beakers are 50 ml TZ 1783 / 75 ml TZ 1786.
TZ 3942	285217790	Sample rack with 42 positions for 150 ml beakers low form or 250 ml beakers tall form (Vessels are included)
TZ 3948	285217800	Sample rack with 48 positionen for 100 ml beakers low form (Vessels are included)
TZ 3972	285217810	Sample rack with 72 positions for 50 ml beakers tall form (Vessels are included)
TZ 3963	285217820	Titration head for sample rack TZ 3942 (42 positions) with 7 openings NS 14,5. For TW 7450
TZ 3967	285217830	Titration head for sample rack TZ 3942 (42 positions) with 7 openings NS 14,5, incl. splash shield. For TW 7450
TZ 3964	285217890	Titration head für sample rack 3948 (48 positions) with 4 openings different sizes. For TW 7450
TZ 3965	285227450	Titration head for sample rack TZ 3948 (48 positions) with 3 openings NS 14 for electrodes and rod stirrer and 2 openings for rinsing nozzle and titration tips, including rinsing nozzle. For TW 7450
TZ 3949	285227440	Rinsing vessel for sample rack TZ 3948, including PVC tube, 3 m
TZ 3970	285227470	Rinsing vessel for sample rack TZ 3972, including PVC-tube, 3 m

Ordering Information: Other Accessories

Type No.	Order No.	Description
TZ 1465	285213980	Cap made out of plastic, with opening for titration vessel TZ 1786, 12 pcs.
TZ 1466	285213990	Aluminium foil for titration vessel TZ 1786, 500 pcs.
TZ 1785	1064589	Glass titration beaker, 250 ml low form (10 pcs.) for TZ 1452/TZ 4012
TZ 1783	1064720	Glass titration beaker, 50 ml tall form (10 pcs.) for TZ 1454/TZ 4024/TZ 4038 and TZ 3972
TZ 1787	285201994	Glass titration beaker, 250 ml tall form (10 pcs.) for TZ 1459/TZ 4016/TZ4025 and TZ 3942
TZ 1788	285202008	Glass titration beaker “super duty", 150 ml low form (10 pcs. for TZ 1459/TZ 4016/TZ4025 and TZ 3942
TZ 1765	285202030	Glass titration beaker, 100 ml tall form (10 pcs.) without spout
TZ 1784	285216747	Glass titration beaker, 150 ml low form (10 pcs.) for TZ 1459/TZ 4016/TZ4025 and TZ 3942
TZ 1786	285216756	Beaker made out of glass for max. 75 ml; diameter 40 mm, height 110 mm (10 pcs) for TZ 1454/TZ 4024/ TZ 4038 and TZ 3972
TZ 1780	285226140	Glass titration beaker “super duty", 250 ml tall form (10 pcs. For TZ 1459/TZ 4016/TZ4025 and TZ 3942
TZ 1766	285226160	Glass titration beaker, 600 ml tall form (10 pcs.) without spout
TZ 1844	285213199	Rod stirrr mid-size model (120 mm) with NS 14.5
TZ 1846	285215134	Rod stirrer long model (200 mm) with NS 14.5 for COD reaction vessels according to DIN 38 409 section 41 for sample changer TW 7200
TZ 1847	285215175	Rod stirrer short model (103 mm) with NS 14.5
TZ 1863	285216530	Propeller blade three-fold made of PTFE