The 'ideal solution' for applications such as diazotisation reactions or nitrations, in which defined temperatures must be maintained
The 711 Liquino from Metrohm 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.
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.
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 aTitrino, 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. Obstructed and overloaded fume cupboards can now 'breathe out', as the up to 3m long cable between Liquino and Dosino allows the 711 to be placed outside the fume cupboard.
The electronics, ie 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.
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.
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 (pre-rinsing 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, eg the determination of Fe(II) with potassium permanganate in acidic solution.
