765, 775 and 776 dosimat trio we leave our mark dosimat 765 776 775.pdfmodern exchange units from...

765, 775 and 776 Dosimat Trio

Liquid handling

Titration and liquid handling in the laboratory

We leave our mark ...

2 765, 775 and 776 Dosimat Trio

Liquid handling ...

Large, backlit display showing the essential parameters

Clearly arranged keys for «live» communication with the Dosimat

Fast serial dispensing with the pipetting equipment (option)

Over the years, the Dosimats have made their name primarily as precise titrant dispensers. This precise dispensing is only one of the numerous application possibilities of these instruments, which are used more and more in the fields of synthesis, process optimization and in preparative research laboratories. By combining well proven and new features, the new Dosimats fulfill user requirements optimally. Three new models, 765, 775 and 776, continue the most successful series of Dosimats. The previously used Exchange Units can still be employed with these new instruments and the Dosimat concept is finding new, varied applications in many laboratories.

The spectrum reaches from practically maintenance-free precision pumps to the highly accurate dispensing of the smallest volumes in the analytical laboratory. This applies, for example, to laboratories working in the following fields:

• Analysis

• Biology

• Electroplating

• Environment

• Foodstuffs

• Petrochemicals

• Pharmaceuticals

• Plant and process

• Plastics

• Preparative organic synthesis

• Textiles

High tech and precision

The dosing concept based on glass cylinder and PTFE piston convinces the user by its precision and the chem-ical resistance of the materials involved: The metered liquid only comes into contact with FEP, PCTFE/PTFE, borosilicate glass or ceramic. Moreover, dispensing is performed not only in laboratories, but also in pilot plants and production areas.

You are sure to find, among the new Dosimats, a so-lution to your dispensing requirements.

Precision in titration – just one of the 765 Dosimat’s features

Using this Dosimat, high-precision titration is child’s play. With the keyboard and the stepless manual setting of the dispensing rate, titrations can be performed very fast or very slow, using very small volume increments. As soon as the endpoint is reached, the large backlit display shows not only the volume with a resolution of 0.001 mL but – thanks to the integrated calculation formula – the result can also be displayed.

The integrated calculation formula is:

Result displayed =

(dosed volume in mL – blank value) x factor / sample size

765, 775 and 776 Dosimat Trio 3

Ready to hand: properly labeled and stored Exchange Units at eye level

765 Dosimat used in a synthesis reaction together with 713 pH Meter and 6.0249.130 Syntrode

... is a basic operation in every laboratory

765 Dosimat: the versatile connection possibilities illustrate the instrument’s flexibility and universality

Precision pump

There is a whole range of applications for the 765 Dosi-mat in the synthesis laboratory and in the pilot plant, where it plays the role of an «electronic dropping funnel» with the following possibilities:

• Pulse-free dispensing even of corrosive liquids with rates between 0.001 mL/min and 150 mL/min.

• pH- or temperature-controlled dispensing together with the 691 or 713 pH Meter and the 692 pH/Ion Meter.

• With two 765 Dosimats, continuous tandem dis-pensing is possible (maximum dispensing rate 7.6 L/h).

Pipetting, diluting, dispensing

For the auxiliary operations pipetting, diluting and dis-pensing, the 765 Dosimat is equipped with the PIP, DIL and DIS modes. The pipetting equipment available as an option allows this work to be performed rationally with volumes between 0.7 and 10 mL.

A wealth of expansion possibilities

The 765 Dosimat is equipped with an RS 232C data interface as standard, which can be used for con-necting a balance, a printer or a computer. Via a com-puter, all functions of the 765 Dosimat can be remotely controlled, every parameter can be set and recalled together with the dispensed volume and the current instrument status.

The 765 Dosimat is also available with an analog output, e.g. for the plotting of the dispensed volume against time in pH stat work (option).

Via the external dispenser contact, dispensing can be controlled by means of a push-button cable or a TTL signal.


From universal instrument ...

Comprehensive test report obtained with the «Dosing Test» software

Dosing test setup with Dosimat under test, balance, PC and printer for the test report

765 Dosimat with balance and 728 Magnetic Stirrer for the prepa-ration of standard solutions

Preparation of standard solutions: the «automatic volumetric flask»

Standard solutions are needed daily in practically every analytical laboratory, e.g. for ion measurements with ISE, voltammetry, photometry, HPLC, IC or spectroscopy. The 765 and 776 Dosi-mats, combined with a balance, allow the automatic preparation of standard solutions in the CNT mode: Simply weigh out the approximate amount of the substance to be dissolved and transfer the weight to the Dosimat, which then calculates the amount of solvent needed and dispenses it.

Automated validation

For the automatic validation of the dosing system, the 765 Dosimat is connected to a balance via its RS 232C interface. The optional 6.6025.000 Dosing Test software controls the au-tomatic dispensing of liquid into a pre-tared vessel placed on an analytical balance. The volume of the dispensed liquid is then calculated and compared with the set volume. The validation re-port conforms to GLP and is printed on the connected printer.


... to upper middle class

The 776 Dosimat succeeds the well-known 725 Dosimat

Thanks to the Exchange Units, changing titrants and/or cylinder volumes is a matter of seconds

776 Dosimat

The 776 Dosimat can handle all basic functions incor-porated in its «big brother», the 765, except the remote control. Consequently, it can satisfy the numerous dis-pensing requirements that occur in the laboratory and its computing facility is particularly appreciated.

Impressive capabilities

The 776 Dosimat offers the following functions:

• It can dispense, dilute and pipette. The pipetting equipment available as an option facilitates these operations.

• You can match the filling and dispensing rate of the burette to your application, a feature which is espe-cially advantageous with reagents of high viscosity or high density.

• Dispensing with subsequent result calculation – us-ing the dispensed volume – has many applications, e.g. acidity of milk or wine, etc.

• «Automatic volumetric flask» for the preparation of standard solutions, e.g. for voltammetry, photometry, HPLC, IC or spectroscopy.

• If a certain dispensed volume must not be exceeded for safety or other reasons, a limit volume can be set.

• Precision pump working at an exactly defined rate, mastering the majority of dosing tasks involving ag-gressive and/or toxic liquids.

• The 765 and the 776 Dosimats possess a non-volatile memory: 10 complete user-specific methods can be stored with their parameters and recalled by simply pressing a key.


Potentiometric titration to a pre-set pH value, a routine operation in the analytical laboratory

775 Dosimat, the no-frills dispenser – titration stands

Titration stand consisting of 775 Dosimat and 728 Magnetic Stirrer, stand rod and electrode holder

Titration – quite easy

At a favorable price, the 775 Dosimat offers you the advantages essential for dispensing, namely extremely high accuracy and the possibility to use modern Ex-change Units with a flat PCTFE/PTFE or ceramic stopcock. One of its many application possibilities is manual titration.

Manual titration with color indicator or pH meter

Titration is by nature a simple procedure and can be performed by extremely simple means. For example:

Performing titrations with a color indicator using a 775 Dosimat, a 728 Magnetic Stirrer and an Exchange Unit. The stirrer ensures complete mixing; using the push button and the analog rate control, you can dispense the reagent with practically any resolution.

If you wish to follow more closely the change in the pH value during the titration, you will also need a pH meter and a combined pH glass electrode.

Titration stands – with Dosimat and stirrer

For titrations with the 765, 776 and 775 Dosimats, the titration stand versions described below are available as options.

We refer to a conventional titration stand as the combi-nation of a Dosimat, a stand rod with electrode holder and a stirrer. The 765 Dosimat is available as a pure and simple Dosimat or as a Dosimat titration stand; the 776 and 775 Dosimats, on the other hand, are not available directly as Dosimat titration stands, but can naturally be expanded to titration stands with the ap-propriate accessories.

Whether stirring is better performed from above with a propeller or below with a magnet is not a matter of controversy any more. With the 727 Titration Stand you can – depending on the model – stir either from above or below. Simply press the rinsing unit and your burette tip and electrode is thoroughly rinsed.

The 703 Titration Stand is ideal for handling liquids. It combines a magnetic stirrer with a pump. With the manually operated pump, solvent can be added to the titration vessel at the push of a button; on completion of the titration, the spent solution can be siphoned off into a waste bottle. The comprehensive accessories include two GL45 bottle attachments for 1 L reagent bottles from Riedel-de Haën and Baker; adapters for reagent bottles from Merck, Fluka or Fisher are avail-able as options.


Titration stands and Exchange Units

Those who prefer a propeller stirrer for titration will select the 727 Titration Stand plus 722 Propeller Stirrer, where rinsing of the elec-trodes is integrated ...

... or one prefers to work with a 728 Magnetic Stirrer

Everything in its right place ... Exchange Unit with 32 mm adapter; note holders for electrode and burette tip

Exchange Units for the Dosimat Trio

The 765, 776 and 775 Dosimats can be fitted with the modern Exchange Units from Metrohm. These offer the following advantages:

• No transfer of reagents is needed as the bottles of many different reagent manufacturers can be in-serted into the Exchange Unit. The reagent bottles are connected either with the bottle attachment of the standard equipment or with adapters available as options.

• Two storage vessels made of polyethylene are used to properly store burette tip and electrode on the Exchange Unit.

• Burette cylinder and tubing connections are pro-tected against light.

• A thermostat jacket for the burette cylinder is avail-able as an option.

• The inscription plate shows you at a glance which reagent you are dealing with.

• The PCTFE/PTFE as well as the ceramic stopcock is resistant to most reagents and withstands a back pressure of 200 kPa (2 bar). Depending upon the ver-sion, the metered liquid comes into contact only with glass, FEP and PCTFE/PTFE or ceramic material.


Thread adapters allow the direct connection of reagent bottles from different manufacturers

The 6.1542.020 PCTFE/PTFE stopcock is optimally suited for non-aqueous and alkaline reagents

For delicate reagents: 1 mL Exchange Unit with 100 mL storage bottle and GL45 thread

Exchange Units

And what’s more: The Exchange Unit is supplied al-ready assembled, i.e. ready for operation.

With all Dosimat models, the stopcock is switched automatically.


Feature 765 Dosimat 776 Dosimat 775 Dosimat

Alphanumeric digital display (97 x 10 mm LCD display) • • •

Operation with push-button cable • • •

Continuous dispensing (DOS) • • •

Light protection for burettes, reagent bottles and tubing

• • •

Use of Exchange Units •* •* •*

Automatic switching of stopcock • • •

Manual setting of the dispensing rate (stepless) • • •

Connection for magnetic or propeller stirrer • • •

Non-volatile memory for user-specific methods • • –

Digital setting of discharge and filling rates • • –

Operation via separate keypad • • –

Preparation of standards (CNT) • • –

Pipetting (PIP) • • –

Dispensing (DIS) • • –

Diluting (DIL) • • –

Attachment of 6.5611.000 pipetting equipment • •** –

Result calculation in DOS mode • • –

Entry of a volume limit value • • –

Digital setting of discharge and filling rates • • –

Can be used for standard addition with the 692 pH/Ion Meter

• • –

RS 232C data interface for connecting a balance, printer, computer

• – –

Analog output (option) • – –

Conventional remote control • – –

Continuous dispensing with 2 Dosimats (tandem) • – –

6.6025.000 GLP «Dosing Test» performed automatically manually manually

* with flat stopcock made of PCTFE/PTFE or ceramic** with 6.2136.000 adapter

Common features and differences


Technical specifications of the Dosimats

776 Dosimat

Modes: DOS Dosing

DIS R Repetitive Dispensing

DIS C Cumulative Dispensing

PIP Pipetting

DIL Diluting

CNT Preparation of solutions with preselected content

Display: LCD, 16 characters, backlit

Exchange Units:1, 5, 10, 20, 50 mL

Resolution: 10 000 pulses per 100% of burette volume

Accuracy and reproducibility:Better than requested by DIN 12650

Dispensing time:Analog setting 20 s ... 17 min

Digital setting 20 s ... 17 h

Method memory: Non volatile

Capacity: 10 methods

Ambient temperature: +5 ... +40°

Storage, transport:–40 ..+60°

Safety specifications:IEC 1010, safety class 1

Power supply:100, 117, 220, 230/240V ± 10%

Frequency 50 ... 60 Hz

Dimensions with Exchange Unit: WxHxD150 x 450 x 275 mm

Weight with Exchange Unit: 4 kg

765 Dosimat

Modes: DOS Dosing

DIS R Repetitive Dispensing

DIS C Cumulative Dispensing

PIP Pipetting

DIL Diluting

CNT Preparation of solutions with preselected content


Exchange Units:

1, 5, 10, 20, 50 mL




Digital setting 20 s ... 17 h

Method memory: Non volatile

Capacity 10 methods

Data interface: RS 232 C

Analog output (option): Range 0 ... 1000 mV

Resolution 1 mV

Remote control: RS 232C


Storage, transport: –40 ... +60°


Power supply:100, 117, 220, 230/240V ± 10%




775 Dosimat

Modes: DOS Dosing


Exchange Units:1, 5, 10, 20, 50 mL





Storage, transport: –40 ... +60°


Power supply:100, 117, 220, 230/240V ± 10%





Ordering information, options

2.765.0010 765 Dosimat

Versatile dispensing instrument with automatic stopcock switching, for titrating and dosing operations in the laboratory. The keypad provides access to the following functions: automatic preparation of standard solutions; pipetting, diluting and dispensing; calculation of results. A wide range of application possibilities as an «electronic dropping funnel» arise in the synthesis lab and the pilot plant. Balance, printer or a computer can be connected via the RS 232C data interface. Push-button cable for manual dispensing control and a 20 mL Exchange Unit (6.3014.223) are included.

2.765.0020 765 Dosimat with analog output for volume recording with a line recorder (e.g. pH stat)

2.765.0030 765 Dosimat titration stand, comprising 765 Dosimat, 728 Magnetic Stirrer, electrode holder and accessories

2.765.0040 765 Dosimat with analog output for volume recording with a line recorder (e.g. pH stat); comprising 765 Dosimat, 728 Magnetic Stirrer, electrode holder and accessories

Options for 765 Dosimat See also «Options for 776, 775 and 765 Dosimats».

6.6025.000 GLP «Dosing Test» software6.5611.000 Pipetting equipment for 765 Dosimat, for 0.7 or 3 mL6.1562.100 Pipetting tube for 6.5611.000 for 10 mL6.1562.050 Pipetting tube for 6.5611.000 for 4 mL6.2124.050 Connecting cable 765 Dosimat – IBM® PC, XT, PS/26.2125.010 Adapter for 6.2124.050 connecting cable for IBM® AT6.2124.060 Connecting cable 765 Dosimat – Seiko DPU 414 printer; needs 6.2125.130 adapter6.2124.070 Connecting cable 765 Dosimat – Citizen iDP56XRS printer, Epson LX, LQ, FX3.980.3170 Connecting cable analog output 765 Dosimat – line recorder6.2125.000 Stackable plug for 765 Dosimat, e.g. for the simultaneous connection of recorder and titrator in pH stat applications3.980.3370 Connecting cable 765 Dosimat – Mettler balances AE (option 011/012), AB, AG (LC-RS25) (Mettler cable ME33640 for Mettler balances

AM, AT, PM)3.980.3380 Connecting cable 765 Dosimat – Sartorius balances with data output MP8, MC1 (RS 232C)– Connecting cable for Precisa balances on request3.980.3140 Connecting cable for continuous dosing with two Dosimats2.727.0100 727 Titration Stand with manual rinsing pump and rinsing head, with built-in magnetic stirrer, for connection to 765, 776 or 775 Dosi-

mats2.727.0010 727 Titration Stand with manual rinsing pump and rinsing head, without built-in magnetic stirrer (requires 2.722.0010 propeller stirrer)2.722.0010 Propeller Stirrer for 2.727.0010 Titration Stand to be connected to 765, 776 or 775 Dosimats; with separate controller and PP stirring

propeller2.703.0010 703 Titration Stand; manually operated, with stirrer and pump for addition of solutions and siphoning off of the titration vessel contents6.2021.020 Electrode holder for up to 4 electrodes and 2 burette tips

2.776.0010 776 Dosimat Universal dispensing instrument for liquid handling in the laboratory; also usable for titrators with pulse control. Automatic stopcock

switching. The keypad is part of the standard equipment and provides access to the following functions: automatic preparation of standard solutions; pipetting, diluting and dispensing; calculation of results. Push-button cable for manual dispensing control and a

20 mL Exchange Unit (6.3014.223) are included.6.5611.000 Pipetting equipment for 776 Dosimat, for 0.7 or 3 mL6.2136.000 Adapter for connecting the pipetting equipment to the 776 Dosimat

See also under «Options for 776, 775 and 765 Dosimats ».

2.775.0010 775 Dosimat Economical dispenser for performing, e.g., manual titrations with color indicator or pH meter. Automatic stopcock switching. Push-button

cable for manual dispensing control and a 20 mL Exchange Unit (6.3014.223) are included.

Options for 776, 775 and 765 Dosimats

2.728.0040 728 Magnetic Stirrer with stand rod, electrode holder, stirring bars and connecting cable 728 – 776, 775 or 765 Dosimat6.2021.020 Electrode holder for up to 4 electrodes and 2 burette tips (the electrode holder is part of the standard equipment of the 2.728.0040

Magnetic Stirrer)2.727.0100 727 Titration Stand with manual rinsing pump and rinsing head, with built-in magnetic stirrer, for connection to 765, 776 or 775 Dosimats2.727.0010 727 Titration Stand with manual rinsing pump and rinsing head, without built-in magnetic stirrer (requires 2.722.0010 propeller stirrer)2.722.0010 Propeller Stirrer for 2.727.0010 Titration Stand to be connected to 765, 776 or 775 Dosimats; with separate controller and PP stirring

propeller.2.703.0010 703 Titration Stand; manually operated, with stirrer and pump for addition of solutions and siphoning off of the titration vessel contents6.1446.030 Bulb stopper SGJ 14/15 for the dispensing tip of the 703 Titration Stand6.2705.000 Guide sleeve SGJ 14/15 for the siphoning tubing of the 703 Titration Stand6.1414.010 Titration vessel lid for electrodes and burette tips, with 5 SGJ 14/15 apertures; for titrations in the titration vessels mentioned below

Titration vessels 6.1415.110 Working volume 1...50 mL6.1415.150 Working volume 5...70 mL6.1415.220 Working volume 20...90 mL6.1415.250 Working volume 50...150 mL6.1415.310 Working volume 70...200 mL


8.023.6003 Subject to modifications

Printed by Metrohm Ltd., CH-9101 Herisau2004-10

Ordering information, options

Exchange Units for the 765, 776 and 775 Dosimats; with ceramic stopcock and light protection

6.3013.113 Exchange Unit with 1 mL burette volume, 1 L reagent bottle of brown glass, with 2 burette tips, one of them with diffusion-reducing micro outlet valve





Exchange Units for the 765, 776 and 775 Dosimats; with PCTFE/PTFE stopcock and light protection






The bottle attachments of the above Exchange Units allow direct reagent dispensing from bottles with GL45 glass thread, i.e. from 1 L reagent bottles from Baker and Riedel-de Haën. For other bottle types, the following adapters are available:

6.1602.110 Bottle attachment for Merck reagent bottles with S40 thread6.1618.000 Adapter 32 mm thread/GL45 for Fluka reagent bottles and 500 mL reagent bottles from Riedel-de Haën6.1618.010 Adapter 28 mm thread/GL45 for Fisher reagent bottles6.1618.050 Adapter 40 mm/GL45 for plastic bottles or PE canisters, e.g. 6.1608.060 (100 mL), 6.1621.000 (10 L)

pH meters and pH electrodes for manual titration with 765, 776 and 775 Dosimats

2.691.0020 691 pH Meter; multipurpose instrument for the laboratory and pilot plant; measures pH, temperature, voltage with and without polarization current; 2 limit values can be entered per measurement range. Automatic buffer recognition; automatic temperature compensation with attached Pt 100 or Pt 1000 temperature sensor. With RS 232C interface.

2.744.00XX 744 pH Meter; simple instrument for the laboratory and pilot plant; measures pH, temperature and voltage. Automatic buffer recognition; automatic temperature compensation with attached Pt 1000 temperature sensor. Memory for 9 measuring values. Including 6.0228.000 LL Solitrode with integrated Pt 1000 temperature sensor and fixed cable.

6.0228.000 LL Solitrode (combined pH electrode) with plastic shaft and integrated Pt 1000 temperature sensor, 1 m fixed cable, shaft length 125 mm

6.0222.100 Combined LL pH electrode with plug-in head, shaft length 125 mm6.2104.020 Connecting cable for 6.0222.100 pH electrode, length 1 m, with plug F6.0249.130 LL Syntrode (combined pH electrode) with sleeve diaphragm, length 450 mm, especially suitable for pH measurements in synthesis

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