711 Liquino

Innovative Dosing and Universal Liquid Handling

The 711 Liquino revolutionises dosing thanks to its precision, handiness and a lot of practical features. The ongoing technical development calls for constant innovation. Features such as accuracy, speed and automation in liquid handling with minimal space requirements are demanded. The 711 Liquino allows all this and much more ...

Whether in analytical or synthesis laboratories or in process chemistry – the 711 Liquino finds numerous applications. From temperature-controlled dosing in chemical synthesis up to fully automated sampling for titration the Liquino offers a wide range of possibilities for use.

Analysis and synthesis

Up to four 700 Dosinos with their dosing units can be controlled by the Liquino 711 and operated with individual dosing programmes. Programming is carried out via the alphanumeric keyboard. The 711 also has an RS 232C interface, which allows the connection of balance or a printer. This also allows the Liquino to be remotely controlled from your PC. Via the «Remote» line the 711 Liquino can control a Titrino, a sample changer or other instruments, and pipetting becomes child's play if a pipetting tip is attached. In addition the 711 has a Pt 100 temperature sensor input with four-wire technology. A PTFE thermometer (Pt 100) that is suitable for syntheses is available as an accessory. The Liquino is thus the ideal solution for applications such as diazotisation reactions or nitrations, in which defined temperatures must be maintained. The user can enter upper or lower temperature limits on the instrument with individual alarm functions. If the limits are exceeded dosing can be stopped and a heating or cooling bath can be switched on via the «Remote» line. In addition there is the possibility of monitoring the course of a reaction by entering a stop volume.

Thanks to these comprehensive capabilities together with extremely small space requirements the 711 Liquino wins a lot of sympathy, particularly in synthesis laboratories. Obstructed and overloaded fume cupboards can now «breathe out», as the up to 3 m long cable between Liquino and Dosino allows the 711 to be placed outside the fume cupboard. The electronics, i.e. the «head» of the Liquino are protected against negative influences in this way. The well-thought-out new design of the dosing element means that no damage is to be expected as a result of a possible leak as the stepping-motor-controlled Dosino sits on top of the dosing unit. The keyboard of the Liquino can be attached to the fume cupboard in a very practical way with the corresponding holder or be placed completely outside the fume cupboard. As a result it is no longer necessary to open the sliding door and fumble about inside the fume cupboard as the instrument can be fully controlled from outside.

Dosing just as you fancy

Dosing – the main function of the 711 Liquino – can be carried out manually or automatically, just as desired or required. The XDOS mode (Extended Dosing) offers numerous dosing possibilities such as:

1. Addition of a particular volume at a given rate.
2. Dosing of a defined liquid volume within a certain time.
3. Addition of a liquid with a given speed during a defined period.

The volume and temperature can be displayed graphically as a function of time and printed out on a printer attached to the RS 232C interface.

If two Dosinos are connected together – the so-called tandem dosing – liquid volumes ranging from a few microlitres up to many litres can be dosed without interruption.

Automation unlimited

The Liquino guarantees comfortable and elegant liquid handling. In combination with a Titrino the special SMPL mode (Sampling) of the 711 allows the automation of complete analyses, such as automatically carrying out titrations. The 711 Liquino can be said to be a sample changer working in minimal space. After the start command the instrument carries out all the work for you: It prepares the titration vessel (prerinsing with solvent), measures out the sample, transfers it into the cell and starts the Titrino. When the titration has been completed the 711 siphons off the liquid, rinses out the titration vessel and prepares it for the next sample. Up to three additional Dosinos with auxiliary solutions can be connected to the Liquino and controlled by it. This opens a wide range of possible applications: apart from simple acid-base titrations you can also carry out complex titrations in which auxiliary solutions must be added, for example the complexometric determination of metals (Mg, Ca, Ba, Co, Ni, Zn, Cd, Pb). The sample solution is first buffered (buffer solution pH = 4, 7 or 10), then the complexing agent (CuEDTA) is added and finally the titration with EDTA is carried out. A further example are redox titrations in which the sample must be acidified prior to the titration, e.g. the determination of Fe(II) with potassium permanganate in acidic solution.

Standard preparation made easy

The preparation of standard solutions or dilution series belongs to the daily tasks of every analytical laboratory. No matter whether in voltammetry, ion chromatography, photometry or spectroscopy, an automated method for the preparation of standard solutions makes the work considerably easier. The CONT mode of the 711 Liquino offers you two ways of doing this:

1. You can prepare a standard solution of the required concentration gravimetrically by entering the exact mass of the standard substance that has been weighed in (automatic data transfer if a balance is connected to the Liquino). The required amount of solvent is calculated and added.
2. You can prepare a standard solution volumetrically by diluting an existing standard in a defined manner. The initial concentration of the standard, the target concentration and the target volume must be entered. The Liquino will then add exactly as much standard solution as is required so that when the volumetric flask is filled up to the mark the required final concentration is achieved.

Programmable

The SEQ mode (Sequence) makes it possible to combine any dosing modes required in a programmed sequence. In this way even complex dosing procedures such as dosing profiles can be carried out. Each step (mode) has its own freely selectable parameters and pauses of any length (date, time) can be entered between the sequences.
The date and time of the start of a method or sequence can be freely selected.

You can control your dosing system with the aid of the 711's GLP mode. The cylinder accuracy of your Dosino is checked according to Metrohm Application Bulletin No. 238. If a balance is connected to the 711 Liquino then the whole process can be automated.

The application methods can be comfortably stored as files on a memory card. This makes it possible for the user to work even with very complex dosing functions. You can configure the memory card according to your own requirements and arrange it in directories.

Ordering information

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