Metrohm 765 User Manual

CH-9101 Herisau/Switzerland Tel. +41 71 353 85 85 Fax +41 71 353 89 01 E-Mail sales@metrohm.ch Internet http://www.metrohm.ch

765 Dosimat

Instructions for Use

8.765.1023

2005.06 ti/dm

Content

1 Overview ...................................................................................................................2

2 Operation with the keyboard ...................................................................................4

2.1 Keypad........................................................................................................................ 4

2.1.1 Key <RATE> .......................................................................................................6

2.2 Modes ......................................................................................................................... 6

2.2.1 Mode DOS, dosing ..............................................................................................7

2.2.2 Mode DIS R, repetitive dispensing....................................................................... 9

2.2.3 Mode DIS C, cumulative dispensing.................................................................... 9

2.2.4 Mode PIP, pipetting............................................................................................ 10

2.2.5 Mode DIL, diluting..............................................................................................11

2.2.6 Mode CNT D, content dispenser .......................................................................12

2.3 User memory ............................................................................................................17

2.4 Special settings.........................................................................................................18

3 Error messages, troubleshooting..........................................................................19

3.1 Special messages and error messages ................................................................... 19

3.2 Diagnosis ................................................................................................................. 21

3.3 RAM initialisation....................................................................................................... 30

3.4 Releasing a locked spindle with insertd Exchange Unit...........................................31

4 Operation via RS232 Interface (green pages) ......................................................33

4.1 General .....................................................................................................................33

4.2 Control commands ................................................................................................... 34

4.3 Handshake and other properties..............................................................................45

4.3.1 Handshake full ...................................................................................................45

4.3.2 Handshake none................................................................................................45

4.3.3 General properties of the RS232 Interface......................................................... 46

4.4 Pin assignment of the RS232 / I/O socket ................................................................ 47

4.4.1 I/O socket, 25 pins ............................................................................................. 47

4.4.2 RS232 interface, 25 and 8 pin sockets ..............................................................48

5 Appendix.................................................................................................................51

5.1 Technical specifications............................................................................................ 51

5.2 Warranty and certificates .......................................................................................... 53

5.2.1 Warranty ............................................................................................................. 53

5.2.2 Certificate of Conformity and System Validation................................................ 54

5.3 Connection of a balance........................................................................................... 56

5.4 Connection of a printer .............................................................................................56

5.5 Continuous dosing with two Dosimats ..................................................................... 57

5.6 Scope of delivery and ordering designations ...........................................................59

Index...........................................................................................................................61

765 Dosimat

Overview

Explanation of symbols:

< > means "key", e.g. <GO> means key "GO"

DOS.....0.000 ml means "display"

765 Dosimat

Overview

1 Overview

Front view of instrument:

1 Exchange unit

Normally the models with automatic cock changeover.

Note: Choose the volume of the exchange unit in such a way that a volume between

10...100% of the nominal volume is expelled.

2 Display The 16 digit display shows all important information:

DOS 3.456 ml Mode (DOS = dosing) and dosed volume. Dosimat is in

stand-by position

DOS ↑ 3.456 ml The piston is moving upwards. DOS ↓ 3.456 ml The piston is moving downwards. DOS → 3.456 ml The cock is turned to the right. DOS ← 3.456 ml The cock is turned to the left.

The display of the status where movements of the piston cannot be clearly identified.

3 Operating keys at the Dosimat

<FILL> Filling. This key is (with remote control off) always accessible

<CLEAR> Resetting of the volume display to 0 with Dosimat in stand-by

<GO> Order to execute the current mode. With mode DOS, dosing

4 Setting of display contrast

5 Analogue setting of dosing rate

Position 1 = lowest rate

Position 10 = highest rate The expelling and filling rates can be set separately (see page 6).

↑ resp.↓ are specially important for very slow dosings

and serves also as emergency stop.

position.

goes on as long as <GO> is pressed.

765 Dosimat

Overview

Rear view of instrument:

6 Data inputs and outputs

Via data transfer interface according to RS 232 C including optional analogue

output. For 25-pin D subminiature plug. Important: Note plug positions, page 47!

Plug cables in and out only if the instruments are switched off.

7 Data inputs and outputs

Via data transfer interface according to RS 232 C. For 8-pin plug. (For details see page 47)

Plug cables in and out only if the instruments are switched off.

8 Connection for keyboard

For details of operation with keyboard 6.2149.000 see page 4ff.

9 Power connection

In power supply systems, in which strong HF interferences (transients) are superimposed on the power voltage, the 765 Dosimat should be connected via an additional power line filter, e.g. METROHM 615 model. The main cables supplied with the instrument are three-core and equipped with a plug with an earthing pin. If a different plug has to be fitted, the yellow/green lead must be connected to the protective earth. Each break in the earthing inside or outside the instrument can make it a hazard. When the instrument is opened or if parts of it are removed, certain components may be live if the instrument is connected to the power line. The power cable must therefore always be unplugged when certain adjustments are made or parts replaced.

10 Power switch

Switching on and off Dosimat. The 765 Dosimat is equipped with a non-volatile memory, i.e. set parameters remain in the working memory if the Dosimat is switched off and on.

11 Earthing socket

The 765 Dosimat must be grounded correctly and effectively, if necessary through the separate earthing socket.

12 Connection for stirrer

In general a Magnetic Stirrer (forms a complete titrating stand). Other stirrers may be connected as well, e.g. a METROHM Rod Stirrer. Supply voltage output:

+9 V DC (I # 200 mA).

13 Connection for external dosing contact

E.g. 6.2107.000 push button cable.

14 Indication of power voltage

Make sure the current has been adapted correctly before Dosimat is switched on.

15 Identification plate Indication of model, series and serial number.

765 Dosimat

2.1. Keypad

2 Operation with the keyboard

2.1 Keypad

RATE VOLUME EXP

BLANK

FACTOR

UNIT

STORE

FILL

GO CLEAR

6.2149.000

SMPL

RECALL

MODE

–

ENTER

RATE Expelling and filling rate in all modes.

VOLUME Different volumes depending on selected

mode. EXP Exponent. BLANK FACTOR Calculation parameters in mode DOS. SMPL

UNIT Unit in modes DOS and CNT

STORE Management of user memory: RECALL Storing, loading of modes.

MODE Selection of mode.

ENTER Confirmation of entries.

FILL Filling and emergency stop key.

CLEAR Resetting of the volume display to 0 with

Dosimat in stand-by position.

GO Start mode. With mode DOS, dosing

goes on as long as <GO> is pressed.

The keys <FILL>, <CLEAR>, <GO> are identical with the corresponding keys on Dosimat.

765 Dosimat

2.1 Keypad

Rules for data input:

• On entering a negative number, key in minus sign first; <-> is not a "change of sign"

key!

• Changeover between first functions (blank, factor etc.) and digits is done

automatically.

• Terminate parameter entries with <ENTER>.

• Some keys are organized as inquiry drums, i.e. pressing these keys several times, dis-

play shows new inquiries. A new value is stored or a new feature is selected with <ENTER>. The program then returns to the initial state, the inquiry drum is left. Entering an inquiry drum, that inquiry, where the drum has been left last time, is displayed first.

• The Dosimat works with a resolution of 10'000 pulses per burette cylinder volume.

Exchange unit

Resolution of display

Volume/mL Rate mL/min

Smallest increment

1 mL .001 .001 0.1 µL

5 mL .001 .005 0.5 µL

10 mL .001 .010 1 µL

20 mL .002 .020 2 µL

50 mL .005 .050 5 µL

If a volume value is entered which can not be dosed exactly with the exchange unit on

the Dosimat, the value is rounded off to the next possible one and stored accordingly. The smallest possible increments for 1 and 5 mL cylinders are not displayed. However, they are dosed and the display is rounded.

• Key <CLEAR> sets parameters to "OFF".

765 Dosimat

2.2. Modes

2.1.1 Key <RATE>

The inquiries of this key are identical for all modes.

Expelling and filling rate

RATE

↑ ml/min

↓ ml/min

This key is accessible live (except in mode DOS), i.e. rate can be changed during a running function .

Expelling rate Range for digital setting depending on volume of exchange unit:

1 mL 0.001 3.00 mL/min 5 mL 0.005 15.0 mL/min 10 mL 0.010 30.0 mL/min 20 mL 0.020 60.0 mL/min 50 mL 0.050 150.0 mL/min

Key <CLEAR> sets "OFF", i.e.. the rate can be controlled analogically by means of potentiometer at the Dosimat 765.

If the preset rate is too high to be dosed with the exchange unit presently mounted, the rate is set automatically to its maximum.

Filling or aspirating rate The data input rules are the same as for the expelling rate.

The filling rate is set to maximum on changing the exchange unit (e.g. always after no exch. unit! is displayed!).

2.2 Modes

MODE

DOS: DOSing

DIS R: DISpensing, Repetitive

DIS C: DISpensing, Cumulative

PIP: PIPetting

DIL: DILuting

CNT D: CoNTent Dispenser

The modes are selected by the inquiry drum <MODE> and confirmed with <ENTER>.

Dosimat is dosing as long as <GO> is pressed. Result calculation can be activated.

Dosimat is dosing a stored dispensing volume if <GO> is pressed, the burette cylinder is refilled and display reset to 0.000 mL.

Dosimat is dosing a stored dispensing volume if <GO> is pressed, the dispensed volume (V-DIS) remains displayed.

Aspirating and subsequent expelling of a stored pipetting volume.

Aspirating a stored pipetting volume and subsequent expelling of the pipetting and diluting volume.

Preparation of solutions with preselected content.

765 Dosimat

2.2 Modes

Example: Selection of mode "DIS C", cumulative dispensing.

Press <MODE>.

Display shows that mode which has been selected last with key <MODE>, e.g.

DOS .

Press <MODE> repeatedly until display shows DIS C .

Load mode "DIS C" into working memory with <ENTER>.

Display shows DIS C 0.000 ml.

Mode "DIS C" is ready to work, the piston is in zero position.

All modes which are loaded into the working memory by key <MODE> are equipped with a set of standard parameters:

Mode V-DIS/V-PIP

V-LIM/V-DIL

↑

Rate

mL/min

Rate ↓

mL/min

Calculation

DOS – OFF OFF max. b=0; f=1; s=1

DIS R 1 – OFF max. –

DIS C 0.1 OFF OFF max. –

PIP 0.1 – OFF OFF –

DIL 0.1 1 OFF OFF –

CNT D – – OFF max. –

2.2.1 Mode DOS, Dosing

Dosimat is dosing as long as <GO> is pressed. Result calculation can be activated.

VOLUME

V-LIM OFF ml

RATE

Security volume: Dosing is stopped if V-LIM has been reached. Input range: 0.001...999.999 mL, OFF

Expelling and filling rate, see page 6.

765 Dosimat

2.2. Modes

Calculation values

BLANK

FACTOR

SMPL

UNIT

b = 0. ml

f = 1.

s = 1.

unit

Blank value Input range: 0...±999.999 mL

Factor Input range: 0... ±1E33

Sample size Input range: 0... ±1E33 Input manually or on-line with balance, see page 56

Unit Input range: ppm, %, g, mg, g/L, mg/L, mol, mol/L, mL, L, /pc, none

Result calculation If one of the calculation values (blank, factor, smpl) is not set to its standard value, a

result is calculated on filling of the Dosimat according to formula:

(dosed volume–blank)*factor Result = ———————————————— smpl

The result is recalculated on each entry of a calculation value (blank, factor, smpl). Pressing <CLEAR> display shows the dosed volume in mL. To start a new dosing, press <GO> twice, pressing once resets the volume in display to 0.000 mL.

Printing the result on a printer If Dosimat is set to send RS 232 on (special settings see page 18), filling the Dosimat or

re-calculation triggers a print command. A continuous number (#), the dosed volume and the calculated result are printed. Do set new calculation parameters for the next dosing only after having pressed <GO> once, i.e. if display shows DOS 0.000 ml. The continuous number is set to zero on switching on the Dosimat and incremented by 1 on every filling command.

Example of print-out

#01 V = 0.352 ml R = 7.04 ppm #02 V = 0.440 ml R = 8.8 ppm #03 V = 0.000 ml #04 V = 0.364 ml R = 7.28 ppm #05 V = 0.438 ml R = 8.76 ppm #06 V = 0.382 ml R = 7.64 ppm #07 V = 0.370 ml R = 19.61 % #08 V = 0.372 ml R = 19.72 %

765 Dosimat

2.2 Modes

2.2.2 Mode DIS R, Repetitive Dispensing

Dosimat is dosing a stored dispensing volume if <GO> is pressed. The burette cylinder is refilled and display reset to 0.000 mL.

Dispensing volume Input range: 0.001...999.999 mL

VOLUME

V-DIS 1. ml

RATE

Expelling and filling rate, see page 6.

2.2.3 Mode DIS C, Cumulative Dispensing

Dosimat is dosing a stored dispensing volume if <GO> is pressed, and the dispensed volume (V–DIS) remains displayed.

Dispensing volume Input range: 0.001...999.999 mL Security volume Dispensing is stopped, if V-LIM has been reached. Input range: 0.001...999.999 mL, OFF

Expelling and filling rate, see page 6.

VOLUME

RATE

V-DIS 0.1 ml

V-LIM OFF ml

Tandem Dosing Mode DIS C is suitable for continuous dosing with 2 Dosimats, see page 57.

765 Dosimat

2.2. Modes

2.2.4 Mode PIP, Pipetting

Aspirating and subsequent expelling of a stored pipetting volume.

VOLUME

V-PIP 0.1 ml

RATE

If mode PIP is loaded, the display shows PIP * 0.000 ml. The sign * in the display means that mode "PIP" is not yet ready to be used. With a first <GO>, a preparation step is carried out which is marked in the display with

PIP prep. . This preparation step includes the formation of an air bubble which

serves to separate the transfer solution of the exchange unit from the sample. Then display shows PIP 1 0.100 ml, i.e. the Dosimat is ready to aspirate the pipetting volume (0.1 mL). With <GO> the pipetting volume is aspirated and display shows

PIP 2 0.100 ml which means that the Dosimat is ready to expel the pipetting volume.

With the next <GO>, the volume is expelled and the Dosimat is then ready to aspirate the next pipetting volume without any preparation step.

If the pipetting volume is changed, a new preparation step is always carried out.

Sequence of PIP

PIP * 0.000 ml

↓

<GO>

↓

PIP prep.

↓

PIP 1 0.100 ml

↓

<GO>

↓

PIP 2 0.100 ml

↓

<GO>

↓

Note

Pipetting volume Input range depends on the volume of the exchange unit:

1 mL 0.001... 0.900 mL 5 mL 0.001... 4.900 mL 10 mL 0.001... 9.800 mL 20 mL 0.002... 19.700 mL 50 mL 0.005... 49.500 mL

Note: The liquid of the exchange unit is mixed with the pipetted liquid if it is aspirated into the burette cylinder! The aspiration tube must contain V-PIP!

Expelling and filling rate see page 6.

Standard mode PIP.

Preparation step: Hold burette tip free at working height. Ready to aspirate the pipetting volume: Immerse burette tip.

Ready to expel the pipetting volume: Hold burette tip for pipetting.

765 Dosimat

2.2 Modes

• A new air bubble is built with every preparation step ("prep.") e.g. its volume increases.

If you wish to keep the volume of the air bubble expel it in mode DOS before changing V-PIP.

• For best pipetting results we recommend exchange units with volumes ≤ 20 mL and

pipetting equipment 6.5611.000.

• The aspirating and expelling rates should not be higher than 20 mL/min.

• Hold tubing tip in an angle of app. 45° to the vessel wall during pipetting. Just the

same as you do with glass pipettes!

• The vessel, containing the liquid you want to pipette should stand on the same level as

the vessel into which you are going to expel the liquid in order to ascertain app. the same level of the pipetting tubing during work.

2.2.5 Mode DIL, Diluting

Aspirating a stored pipetting volume and subsequent expelling of the pipetting and diluting volume.

Pipetting volume Input range depends on the volume of the exchange unit:

1 mL 0.001... 0.900 mL 5 mL 0.001... 4.900 mL 10 mL 0.001... 9.800 mL 20 mL 0.002... 19.700 mL 50 mL 0.005... 49.500 mL

Diluting volume Input range: 0.001...999.999 mL

Note: The diluting liquid is unintentionally mixed with the pipetted liquid if it is aspirated into the burette cylinder! The aspiration tube must contain V-PIP!

Expelling and filling rate see page 6.

VOLUME

RATE

V-PIP 0.1 ml

V-DIL 1. ml

If mode DIL is loaded, the display shows DIL * 0.000 ml. The sign * in the display tells you that mode DIL is not ready to be used. With <GO> a

preparation step is carried out during which V-PIP is expelled into the bottle of the exchange unit and an air bubble is built to separate the solution of the exchange unit from the sample.

Then the Dosimat is ready to aspirate the pipetting volume (0.1 mL) which is displayed by

DIL 1 0.100 ml and carried out after pressing <GO>.

Then DIL 2 1.100 ml is displayed which means that the Dosimat is ready to expel the pipetting and the diluting volume (0.1 mL + 1 mL = 1.1 mL). This is executed after <GO>. The preparation step is now carried out automatically and the Dosimat is ready to aspirate the next pipetting volume.

765 Dosimat

2.2. Modes

Sequence of DIL

DIL * 0.000 ml

↓

<GO>

↓

DIL prep.

↓

DIL 1 0.100 ml

↓

<GO>

↓

DIL 2 1.100 ml

↓

<GO>

↓

DIL prep.

↓

Standard mode DIL.

Preparation step: Hold burette tip free at working height. Ready to aspirate the pipetting volume: Immerse burette tip.

Ready to expel the pipetting and diluting volume: Hold burette tip for pipetting.

Notes

• If you wish to change V-PIP, it is best to change it during filling in the preparation step,

i.e. when display shows DIL ↓ prep..

• If V-PIP is changed at another time, a new preparation step is carried out, which

changes the volume of the air bubble. The first dilution after such a change could be erroneous and should be discarded. Another possibility is to expel the air bubble in mode DOS and to start Mode DIL from the beginning. V-DIL can be changed at any time without a new preparation step.

2.2.6 Mode CNT D, Content Dispenser

Mode CNT D is used to prepare solutions with a particular content. Doing this, the substance must not be weighed-out to a particular value in order to obtain the preselected content but the 765 Dosimat dispenses the amount of solvent calculated correspondingly.

RATE

Expelling and filling rate see page 6.

765 Dosimat

2.2 Modes

Content entries which can be implemented in the CNT D mode are summarized below and designated with a bold frame

Reference quantity

(denominator)

Specified quantity

(numerator)

Amount of

substance

/ mol

Mass

/ kg

Concentration Fraction Molality

Volume

of the solution

V / L

Amount of substance concentration c

= ni/V

Units: mol/L, mmol/L Example: c(NaOH)=0.1 mol/L Outdated: molarity, molar

Mass concentration ρ

Units: g/L, mg/L Example: ρ(Pb Outdated: mg%

= mi/V

)= 1 g/L

Amount of substance fraction x

Unit: 1 Example: x(Au)=0.005 Outdated: mole fraction, mole

Mass fraction w

Units: %, ppm; 1 Example: w(H Outdated: weight percent

Sum

of the components j

xi = ni/Σnj

percent

= mi/Σmj

O)= 5%

Mass

of the solvent

/ kg

Molality b

= ni//mk

Unit: mol/kg, mmol/kg Example: b(KOH, in EtOH) = 1

mol/kg

Sequence of CNT D

CNT D 0.000 ml

↓

unit %

↓ ↓

<ENTER>

↓

cnt 1 %

↓

Input <ENTER>

↓ ↓ ↓ ↓ ↓ ↓

s 1 g

↓

Input <ENTER>

Standard mode CNT D. Display changes automatically after preparation. Choose unit by pressing key <UNIT>. The volume is calculated according to the chosen unit.

Input of the desired numerical value for the content. Depending on the unit selected the following auxiliary variables are inquired during the first run:

M 1 g/mol Molar mass of the substance dens. 1 g/ml Density of the solvent f 1.00000 Factor for volume contraction

Input of the weight manually or via a balance, see page 56.

↓

add V XXX.XXX ml

↓ ↓ <GO> <CLEAR>

↓ dosing V

The calculated volume is displayed and expelled with <GO>. With <CLEAR> the values for "cnt" and/or "s" can be changed. This gives an idea of the approximate weighing. Pressing <MODE>, the mode can be changed.

765 Dosimat

2.2. Modes

The formulae for calculation of the volume to be dispensed "add V" are shown in the following table, with

cnt content in the selected unit M molar mass of substance to be weighed out f factor dens density of the solvent s weight of substance

Unit Formula for

add V =

Amount-of-substance concentration

mol/L

mmol/L

f·s·10

cnt·M

f·s·10

Mass concentration

g/L

mg/L

cnt

f·s·10

cnt

f·s(10

Mass fraction

ppm

-cnt)

cnt·dens

f·s(10

-cnt)

cnt dens

Molality

mol/kg

mmol/kg

s·10

cnt·M·dens

s·10

cnt·M·dens

Application of factor f

Factor f for ionic standards

With ionic standards, the mass fraction of a single ion A is usually specified. On the other hand, the solution is prepared from A Pb(NO

. The factor f is calculated from the formula:

3)2

, e.g. a standard of 10 ppm Pb2+ prepared from

nBm

n*M(A) m*M(B) f = ———— or f = ———— M(A

) M(AnBm)

nBm

M(A): molar mass of ion A M(B): molar mass of ion B M(A

): molar mass of substance AnBm

nBm

765 Dosimat

2.2 Modes

The following table shows factors for the most common ionic standards:

Cation Standard

prepared from:

Na+ NaCl

Factor f Anion Standard

prepared from:

0.39339

NaF 0.45245

Factor f

NaNO

K+ KCl

KNO

Ca2+ CaCl2 0.36111 Br- NaBr·2H2O

Ba2+ BaCl2·2H2O

Ba(NO

3)2

Cu2+ Cu(ClO4)2

Cu(NO

·6H2O

3)2

Pb2+ Pb(ClO4)2·3H2O

Pb(NO

3)2

0.27050

0.52441

0.38670

0.56222

0.52550

0.24214

0.21494

0.45028

0.62557

NaCl

KCl

0.60666

0.47550

0.57514

KBr

KI 0.76444

NaNO3

Na2HPO4·12H2O

3PO4

0.55087

2SO4

KNO

·12H2O

0.67141

0.72950

0.61319

0.26519

0.24985

The factor f as correction for substances with admixtures

e.g. water of crystallization, impurities, moisture.

The factor f as correction for the volume contraction

For the amount-of-substance concentration c (units mol/L and mmol/L) and the mass concentration ρ (units g/L and mg/L), the concentration is referred to the volume of the solution.

= ni/V resp. ρi= mi/V

where n m

amount of substance i

mass of substance i

V volume of the solution

765 Dosimat

2.2. Modes

Since the volume of the solvent V0 is dispensed in the operational method of the CNT D mode, higher concentrations require a correction factor which takes the difference between V

and V (volume of the solution) into consideration:

f = —– V

This factor can be determined with the Dosimat in the DOS mode: A solution of the desired concentration is prepared in the conventional manner in a volumetric flask by dispensing the solvent with the aid of the Dosimat up to the mark of the flask (V

). If the volume V of the volumetric flask is inputted in the calculation

parameter "s", the factor f is calculated directly by the Dosimat and appears on the display. The factor f determined in this manner holds for the appropriate substance/solvent pair in the measured concentration range with the possibility of linear extrapolations up to concentrations of ca. 1 mol/L.

Several correction factors are shown in the following table:

Concentration c

0.05

mol/L

0.1 mol/L 1 mol/L

Substance/solvent

Potassium hydrogen

0.999 0.998 0.982

phthalate/water

Na2EDTA·2H2O/water 0.991 0.981 -

NaCl/water 0.999 0.998 0.982

KNO3/water 0.998 0.997 0.960

CuSO45H2O/water 0.995 0.992 0.904

765 Dosimat

2.3 User memory

Up to 10 modes, complete with their user selected specific parameters, can be stored in the user memory.

The relation of the different memories is shown in the following table:

Fixed memory

contains: modes with standard parameters: DOS DIS R DIS C PIP DIL CNT D

Working memory

contains: 1 mode; parameters can be modified

Management of user memory

STORE

RECALL

6 5

<STORE><X><ENTER> Storing a mode at address X (X=0,1,...9)

<RECALL><X><ENTER> Loading a mode from the user memory into the working memory.

Ex factory, the standard modes are stored in the user memory.

User memory

contains: up to 10 user modes

765 Dosimat

2.4. Special settings

2.4 Special settings

Special settings can be executed by pressing keys <0> and <—> simultaneously. The display shows Sys. Soft-Reset . Press key <0> and keep it pressed until special key 0..6 appears in the display.

Press key 1...6. Pressing key <CLEAR> once, leads back to the blinking display

special key 0..6 and pressing key <CLEAR> again leads to the corresponding mode in

the working memory.

Pressing key <GO>, the next inquiry is displayed, with <ENTER> the setting is stored.

Key Display Explanation

< 0 > 5.765.0010 Display of program number

< 1 > baud rate 9.6 K Setting of baud-rate: 110, 150, 300, 600, 1.2K, 2.4K,

4.8K, 9.6K, 19.2K: Press <GO> until the right number is displayed and store with <ENTER>. Several quantities are set to a fixed value: data bit = 7, parity = even, stop bit = 1.

< 2 > #V(B)/1000 mV 1 Number of burette volumes per ∆U = 1000 mV at

the analogue output: 1,2...10 V(B). Press <GO> until the right number is displayed and store with <ENTER>.

< 3 > auto fill on Automatical refilling in mode DOS if more than one

burette volume has been expelled: on = yes; off = no. Press <GO> until the right answer is displayed and store with <ENTER>.

< 4 > send RS232 off Data transfer in mode DOS: on = yes, off = no.

Press <GO> until the right answer is displayed and store with <ENTER>.

< 5 > balance Mettler Choice of balance to be connected: Mettler, Sartori

(=Sartorius). Press <GO> until the right balance is displayed and store with <ENTER>. For detailed information about the connection of a balance see page 56.

< 6 > RS232 HSHK full Choice of handshakes for data transfer to RS232:

full, none. "full" is used for connections with Metrohm instruments. "none" can be used e.g. for data transfer via a Windows terminal. See also page 45.

765 Dosimat

3.1 Special messages and error messages

3 Error messages, troubleshooting

blinking value The value keyed in is out of the input range.

3.1 Special messages and error messages

cylinder empty! The Dosimat is set to "auto fill off" and one burette volume has

been expelled in mode DOS. Exit: <FILL>

error 1 Check sum error in PROM.

Remedy: Call Metrohm-Service

error 2 RAM-check: Error in on-chip-RAM.

Remedy: Call Metrohm-Service

error 3 RAM-check: Error in off-chip-RAM.

Remedy: Call Metrohm-Service

error 4 RAM-check: Error in on- and off-Chip-RAM.

Remedy: Call Metrohm-Service

error 5 Check sum error in off-chip-RAM.

Remedy: RAM has to be re-initialized: Switch Dosimat off. Press <FILL> during switching it on again. Display shows "RAM init.". Press <GO> . Display shows "RAM init. passed". <CLEAR> leads to basic program.

Note: Stored user modes will be cleared on re-initializing of the RAM and standard mode DOS is loaded into the working memory.

INF In mode DOS, a result has been calculated with s=0 or the

calculated result is larger than the range of numbers which can be displayed (1 E+39). Exit: <CLEAR>

NaN (Not a number). In mode DOS, a result has been calculated

with s=0 and f=0. Exit: <CLEAR>

no exch. unit! Exchange unit is not (properly) mounted.

Exit: Mount exchange unit properly. Note: The filling rate is set to maximum.

V> XXXX ml In mode CNT D the volume to be dosed is >999.999 mL.

Exit: <CLEAR> and enter new weight.

V< XXXX ml In mode CNT D the volume to be dosed is smaller than the

smallest possible increment which can be dosed with the exchange unit mounted. Exit: <CLEAR> and enter new weight.

765 Dosimat

3.1. Special messages and error messages

volume <resol.! The volume to be expelled is smaller than the resolution of the

burette with the exchange unit mounted on the Dosimat. Exit: Change volume to a value which can be expelled with the exchange unit mounted on the Dosimat or mount an exchange unit where the volume can be expelled.

V-LIM reached! Security volume is reached.

Exit: <FILL>.

V-PIP > V(B) The stored pipetting volume is higher than the burette volume

of the exchange unit mounted on the Dosimat. Exit: Change volume to a value which can be expelled with the exchange unit mounted on the Dosimat or mount an exchange unit where the volume can be expelled.

765 Dosimat

3.2 Diagnosis

3.2.1 General

The 765 Dosimat is a very precise and dependable feeding instrument. Thanks to its rugged construction, it is highly unlikely that external mechanical or electrical influences will have any adverse effect on its functions.

Although a fault in the instrument can not be excluded with certainty, the possibility is greater that malfunctions are caused by wrong operation or handling, through improper connections and the operation with third-party devices.

Whatever the case, it is always advisable to localise the fault with the diagnostic tests, which can be performed quickly and simply. The customer need call Metrohm service only when the instrument really has a fault. Further, he can use the results of the specific diagnostic function to provide the service engineer with much more precise information.

In the case of inquiries, always quote the serial number on model plate (see page 3), the program version (see page 18) and if applicable the error message.

Procedure

The diagnostic menu listed in section 3.2.2 shows all components for which detailed instructions (diagnostic steps) are available for checking the functionality.

In the case of a possible malfunction, we advise you to perform either the corresponding diagnostic step or all diagnostic steps as a routine check on the instrument.

The reactions of the Dosimat to the instructions must be compared with the descriptions in the diagnostic step. If the Dosimat do not show the expected reaction ("No" case), the appropriate diagnostic step must be repeated to exclude operating errors. However, it is highly probable that repeated wrong reactions indicate a malfunction.

Equipment required:

3.496.0070 Dummy-exchange unit (or exchange units if possible with different cylinder

6.2107.000 Push-button cable or ordinary test lead with 4 mm banana plugs

6.2149.000 Keyboard

3.496.8360 Test plug

-.---.---- Stop watch or watch with second hand.

-.---.---- Voltmeter (perhaps a calibrated recorder)

volumes).

765 Dosimat

3.2. Diagnosis

3.2.2 Summary

3.2.4 Diagnosis of cylinder code..............................................23

3.2.5 Diagnosis of key board....................................................23

3.2.6 Diagnosis of display ........................................................23

3.2.7 Diagnosis analog output .................................................24

3.2.8 Diagnosis of digital timer .................................................25

3.2.9 Diagnosis of analog timer................................................26

3.2.10 Diagnosis of external inputs, outputs..............................26

3.2.11 RAM-test ..........................................................................27

3.2.12 Diagnosis of spindle zero and cock changeover............27

3.2.13 Diagnosis of spindle drive ...............................................27

3.2.3 Prepare instruments for diagnostic tests

Power off.

Remove exchange unit.

Disconnect all cables at rear, except mains cable and keyboard.

Power on and simultaneously press key <9> and keep pressed until

diagn. key 0...9

The individual inquiries of the several diagnostic steps are accessed using the key <0> ... <9>, exit is with the <CLEAR> key.

diagn. key 0...9

║ ║ ╠══ < 0 > ║ ╠══ < 1 > ║ ╠══ < 2 > ║ ╠══ < 3 > ║ ╠══ < 4 > ║ ╠══ < 5 > ║ ╠══ < 6 > ║ ╠══ < 7 > ║ ╠══ < 8 > ║ ╚══ < 9 >

cylinder code

keys test

display test

analog output

timer dig. test

timer ana. test

extern in/output

spind. mot. cal.

RAM TEST

RAM init.

Instrument adjustment

This diagnostic step is reserved for the service engineer and therefore will not be described within this document.

765 Dosimat

3.2 Diagnosis

3.2.4 Diagnosis of cylinder code

Prepare instrument for diagnostic test (see chap. 3.2.3).

<0>

cylinder code

<GO>

no exch. unit!

Insert (dummy) exchange unit.

code: xx ml

Check whether the displayed ml-Code (xx ml) corresponds to the exchange unit.

Various exchange units can be inserted to verify their ml-code.

If an exchange unit is coded incorrectly or if the code switches are inoperative, the display shows: E 90: .. no code!

<CLEAR>

diagn. Key 0...9

3.2.5 Diagnosis of key board

Prepare instrument for diagnostic test (see chap. 3.2.3).

<1>

keys test }

<GO>

key: rate

The display requests to press the key <RATE> on the keyboard 6.2149.000.

<RATE>, <7>, <4>, <1> etc.

If the correct key was pressed and the test was positive the name of the next key to be pressed will be displayed.

Display E 10: and on the right-hand side the name of an other key indicates a fault in the keyboard matrix, or the wrong key was pressed.

A fault indication may be cancelled by pressing <CLEAR>. “breaking off ?“ is then displayed, asking you whether you want to stop the test or not.

- To stop press <CLEAR>.

- To continue press <GO> until the display shows “keys test end“

After pressing the last key (GO), the following appears:

keys o.k.

<CLEAR>

diagn. key 0...9

3.2.6 Diagnosis of display

765 Dosimat

Prepare instrument for diagnostic test (see chap. 3.2.3).

3.2. Diagnosis

<2>

display test

<GO>

Characters are generated for an optical check of the display:

1. The display is written to from left to right with the character

2. Repeatedly the display is written to with the characters

3. In quick succession the display is written to with the capital letters from the alphabet.

4. The display is written to with the character set (see Fig. 1) as continuous moving display.

The test sequence can be held by pressing key <5> and restarted.

The continuous moving display is quit by pressing the keys <5> and <CLEAR>.

DP, keys test for 1.5 s

key: FILL }

The display requests to press the key <FILL> on the front of the Dosimat.

If the correct key was pressed and the test was positive the name of the next key to be pressed will be displayed.

Display E 10: and on the right-hand side the name of an other key indicates a fault in the keyboard matrix, or the wrong key was pressed.

A fault indication may be cancelled by pressing <CLEAR>. “breaking off ?“ is then displayed, asking you whether you want to stop the test or not.

- To stop press <CLEAR>.

- To continue press <GO> until the display shows “keys test end“

After pressing the last key (GO), the following appears:

keys o.k.

and .

<CLEAR>

diagn. key 0...9

Fig. 1

3.2.7 Diagnosis analog output

To carry out this diagnosis step the optional analog output has to be fitted in the Dosimat (fitted as a standard with versions 2.765.0020, 2.765.0040)

765 Dosimat

3.2 Diagnosis

Prepare instrument for diagnostic test (see chap. 3.2.3).

Connect voltmeter, DVM or recorder by means of cable 3.980.3170 to location A (do not switch off the unit).

Plug A Pin 21 (0...+1 V) Plug A Pin 11 (ground)

<3>

<GO>

<2>, <GO>

analog output

V-out = 0.000 V

Measuring instrument reads 0 V (tolerance ±6 mV). Take also into account the tolerance of the measuring instrument!

V-out = 1.000 V

Measuring instrument reads +1.000 V (tolerance ±6 mV + tolerance of point 4.)

V-ramp 1...2

In this test sequence the Dosimat produces at the analog output a triangle voltage. Two different rising or falling times can be selected:

1: rising or falling time = 48 ms (reserved for the service engineer)

2: rising or falling time = 40 s

V-ramp = 40s ↑/↓

[V]

out

0 t [s]

Within the first 40 s the voltage rises linear.

Within the second 40 s the voltage falls linear.

When terminated the display shows:

V-ramp = 1...2

<CLEAR>

diagn. key 0...9

Remove cable and measuring instrument.

3.2.8 Diagnosis of digital timer

The digital timer is that part of the electronic circuit in the dosimat which is responsable for the digital spindle speed rate.

765 Dosimat

3.2. Diagnosis

Prepare instrument for diagnostic test (see chap. 3.2.3).

<4>

timer dig. test

<GO>

timer dig.

The frequency of the digital timer is measured during 1.5 s. If no fault is found, the following appears:

timer dig. o.k.

<CLEAR>

diagn. key 0...9

3.2.9 Diagnosis of analog timer

The analog timer is that part of the electronic circuit in the dosimat which is responsable for the analog spindle speed rate (adjustable with knob 'dV/dt').

Prepare instrument for diagnostic test (see chap. 3.2.3).

Turn knob 'dV/dt' fully to the right.

<5>

timer ana. test

<GO>

timer ana.

The frequency of the analog timer is measured during 1.5 s. If no fault is found, the following appears:

timer ana. o.k.

<CLEAR>

diagn. key 0...9

3.2.10 Diagnosis of external inputs, outputs

This test is necessary only if the 765 Dosimat is interconnected with other instruments via terminal A. Moreover, this test requires the test plug 3.496.8360 which is a facility for the repair service. However, it can also be ordered by customers with the above order number.

Prepare instrument for diagnostic test (see chap. 3.2.3).

Without switching off the instrument, insert plug 3.496.8360 into location A. Take care of the direction of the plug. Red banana plug to red socket 'D'.

<6>

extern in/output

<GO>

The test runs automatically. If no fault is found, the following appears:

ext. in/out o.k.

765 Dosimat

3.2 Diagnosis

<CLEAR>

diagn. key 0...9

Remove test plug 3.496.8360.

3.2.11 RAM-test

Prepare instrument for diagnostic test (see chap. 3.2.3).

<8>

RAM test

<GO>

The test runs automatically. If no fault is found, the following appears:

RAM TEST passed

<CLEAR>

diagn. key 0...9

3.2.12 Diagnosis of spindle zero and cock changeover

Power off.

Insert exchange unit.

Power on.

Dosimat fills.

Remove exchange unit.

To check the spindle zero.

The spindle must be 0.2 - 0.6 mm below the edge of the mounting plate (see Fig. 2).

The link piece of the cock coupling must be parallel to the side walls of the Dosimat (see Fig. 3).

0.2 - 0.6 mm

Fig. 2 Fig. 3

3.2.13 Diagnosis of spindle drive

Insert exchange unit and put the burette tip into a collecting receptacle.

Connect push-button cable 6.2107.000 (if available).

765 Dosimat

3.2. Diagnosis

Power off and wait for 5 s.

Power on and simultaneously press key <0> and keep pressed until:

10.

special key 0..6

<3>

auto fill ???

└─┬─┘ check whether display reads 'on' or 'off' (make note!)

Press <GO> if auto fill 'on' otherwise go on with item 7.

auto fill off

The dotted pattern is displayed, afterwards the display changes to the mode used last before starting the diagnosis.

Dosimat fills.

Actuate <MODE> several times until the display shows:

DOS

< ENTER >

DOS 0.000 ml

<RATE>

11.

12.

13.

14.

15.

↑ OFF ml/min

< RATE >

↓ xx ml/min

xx : (depending on exchange unit code)

<CLEAR>

↓ OFF ml/min

< ENTER >

DOS 0.000 ml

Knob 'dV/dt' fully to the right.

Press feed button 6.2107.000 (if not available, <GO>) all the time until the piston rod reaches the top position and simultaneously measure the time from start to stop.

16.

cylinder empty!

Spindle remains at top position.

The running time of the spindle is 18 ... 22 s.

Measure the spindle height [can be performed only if dummy exchange unit

3.496.0070 is fitted, or the exchange unit removed and the locking switch (in the right-hand hole) carefully actuated by means of a screw driver].

765 Dosimat

3.2 Diagnosis

17.

The spindle moves 80 mm with respect to spindle zero.

Instead of the spindle height one can also measure the expelled volume (corresponding to the max. volume of the exchange unit).

Actuate <FILL> and simultaneously take the time until the dosimat is in 'ready' position again.

18.

19.

20.

21.

22.

Filling time: one cock cycle 1 s filling 18 ... 20 s

General rules:

Spindle and cock must move in regular speed (observe sound!)

In the filling position the cock coupling must turn the lever of the exchange unit blamelessly to the left stop (almost without play and without jamming).

Knob 'dV/dt' fully to the left.

<MODE>: select DIS R.

<ENTER>

DIS R 0.000 ml

V-DIS 1. ml

Depending on the exchange unit used, enter the volume as below:

1 ml: 0.02 ml 5 ml: 0.1 ml 10 ml: 0.2 ml 20 ml: 0.4 ml 50 ml: 1 ml

23.

<ENTER>

24.

<GO> (depress briefly) and with a stop watch take the time until the cock starts turning.

25.

The time must be 14 ... 24 s.

Reset the parameter if under 5. the reading was auto fill = on .

765 Dosimat

3.3. RAM-initialisation

3.3 RAM-initialisation

In rare cases, it is possible that major interference signals such as line spikes and lightning can have an adverse influence on the contents of the data memory. If the contents of the data memory are undefined, this is indicated after “power on“ with ‘error 5'. The keyboard is then blocked, no entering is possible until the RAM is initialised again.

Disconnect all cables at rear, except mains cable.

Power off and wait 5 s.

Power on and simultaneously press key <FILL> and keep pressed until

RAM init.

<GO>

RAM init. passed

<CLEAR>

DOS 0.000 ml

Dosimat fills.

The RAM-initialisation deletes the data present in the User-Memory and also those for the special functions and overwrites them with the standard data below:

The User-Memory is loaded with the standard modes.

Memory 0: Mode DOS 1: DIS R 2: DIS C 3: PIP * 4: DIL * 5: DOS 6: DIS R 7: DIS C 8: PIP * 9: DIL *

The working memory is loaded with the standard mode DOS. The special functions of the dosimat are set to the following values:

Analog output scale: 1 stroke per 1000 mV RS 232 sending: off Baudrate: 9600 Baud auto. filling: on

765 Dosimat

3.4 Releasing a locked spindle

3.4 Releasing a locked spindle with inserted Exchange Unit

The burette drive may very occasionally jam at the top or bottom end of the cylinder. If jamming occurs at the top or when the drive is out of function, the Exchange Unit can no longer removed. In this case, it is necessary to proceed as follows:

2 screws (M4 countersunk)

Fig. 4

Disconnect instrument from power supply!

2 screws (M3 fillister head) knob

edge of bench

Remove control knob.

Place instrument over edge of bench to allow the M3 screws to be removed.

Remove M4 screws.

Lift off top part of instrument together with Exchange Unit in the manner shown by the arrow.

The electronic circuits are now accessible!

On no account touch these!

Remove spindle from mechanical stop by turning the large gear wheel. (In case that the motor is inoperative, position spindle by hand to zero position.)

765 Dosimat

4.1 General

4 Operation via RS232 Interface

4.1 General

The Dosimat offers an extensive remote control. Data transmission occurs via an interface according to RS 232 C in half duplex procedure.

The syntax of the commands is based on the following principles:

• Commands are strings which always begin with a letter.

• Only the first three letters are significant, string length is unlimited.

• Actual parameters have to be separated by a space from the preceding command.

• The input range for numbers is -1E33 ... -1E-37, 0, 1E-37 ... 1E33.

Examples of possible numbers: 3.567

-.5

5.E4

-123.45E-12

• Set 'CR' + 'LF' at the end of a complete command.

'CR': carriage return (ASCII sign No. 13) 'LF': line feed (ASCII sign No. 10)

• All commands, where the Dosimat has to send data, begin with letter 'Q' (query).

• Each string sent by the Dosimat ends with 'CR' + 'LF'.

• Set handshake up for every character (asynchronous transfer).

There are several exceptions in order to avoid problems with time:

• The commands GO, STOP, FILL, CLEAR, and INFORMATION are so-called 1-byte

commands. They are simply transmitted as 'G', 'S', 'F', 'C', and 'I' . No separating and terminating signs are necessary.

• With command 'I' (Information), the Dosimat sends two information bytes containing

the information READY, CODE, LOCK, LIMIT etc. see 4.2.7.

• Several commands can be transmitted "live", i.e. during a running function. All other

commands are recognized only if the Dosimat is in its ready state, see 4.2. If commands are not recognized, the corresponding error bytes of information byte 2 are set and may be inquired with command 'I'.

765 Dosimat

4.2. Control commands

4.2 Control commands

Command Explanation Live Notes

REMOTE ON Remote control on Y 4.2.1

REMOTE OFF Remote control off Y 4.2.2

G GO N 1-byte command 4.2.3

S STOP Y 1-byte command 4.2.4

F FILL Y 1-byte command 4.2.5

C CLEAR volume display N 1-byte command 4.2.6

I Information Y 1-byte command 4.2.7

DOS Standard mode DOS N 4.2.8

DIR Standard mode DIS R N 4.2.9

DIC Standard mode DIS C N 4.2.10

PIP Standard mode PIP N 4.2.11

DIL Standard mode DIL N 4.2.12

MDO Mode DOS N Pervious param. 4.2.13

MDR Mode DIS R N Pervious param. 4.2.14

MDC Mode DIS C N Pervious param. 4.2.15

MPU ON Mode PULSE on N Pervious param. 4.2.16

MPU OFF Mode PULSE off Y Pervious param. 4.2.17

MSTORE X Mode store N

MRCALL X Mode recall N

PBLANK VALUE Parameter blank Y 4.2.20

PFACTOR VALUE Parameter factor Y 4.2.21

PSMPL VALUE Parameter smpl Y 4.2.22

UNIT X Unit Y

VUP VALUE Rate up Y 4.2.24

VDWN VALUE Rate down Y 4.2.25

VUA Rate up analog on Y 4.2.26

VDA Rate down analog on Y 4.2.27

VDS VALUE Dispensing volume N 4.2.28

0 ≤ X ≤ 9, J 4.2.18

0 ≤ X ≤ 9, J 4.2.19

0 ≤ X ≤ 9 , J, K 4.2.23

VPIP VALUE Pipetting volume N 4.2.29

VDL VALUE Diluting volume N 4.2.30

VLIM VALUE Limit volume N 4.2.31

VLIM OFF Limit volume off N 4.2.32

765 Dosimat

4.2 Control commands

Command Explanation Live Notes

AFILL ON Auto fill on Y 4.2.33

AFILL OFF Auto fill off Y 4.2.34

QDISPLAY Query display Y 4.2.35

QVOLUME Query volume (ml) Y 4.2.36

QPOSITION Query piston position Y 4.2.37

QPROGRAM Query program version Y 4.2.38

QMODE Query mode Y 4.2.39

QPBLANK Query blank Y 4.2.40

QPFACTOR Query factor Y 4.2.41

QPSMPL Query smpl Y 4.2.42

QVUP Query rate up Y1) 4.2.43

QVDOWN Query rate down Y1) 4.2.44

QAUP Query rate analog up on/off Y 4.2.45

QADOWN Query rate analog dwn on/off Y 4.2.46

QDS VOLUME Query dispensing volume Y 4.2.47

QPIP VOLUME Query pipetting volume Y1) 4.2.48

QLIM VOLUME Query limiting volume Y 4.2.49

QDL VOLUME Query diluting volume Y1) 4.2.50

QUNIT Query unit Y 4.2.51

QAFILL Query auto fill Y 4.2.52

Use these commands in mode PIP and DIL only not live, i.e. if Dosimat is ready.

Below, every control command is described in detail:

4.2.1 REM ON

Remote on, live Remote control on. Entries via keyboard are no more possible, the only accepted commands come from remote control. Calculations in mode DOS are carried out and displayed until the Dosimat is in its ready state (≥ 3 s). An eventual result transmission (QDISP) is terminated before the Dosimat has reached its ready state.

4.2.2 REM OFF

Remote off, live Remote control off. Entries via keyboard are possible again. With remote control off, remote control commands are not accepted any more. Command "I" (Information) is active.

765 Dosimat

4.2. Control commands

4.2.3 G

GO, not live, 1-byte command 'GO' triggers dosing in all modes. In mode DOS dosing goes on until a stop command is received.

4.2.4 S

STOP, live, 1-byte command

'STOP' terminates dosing in modes DOS, DIS R and DIS C (not filling).

4.2.5 F

FILL, live, 1-byte command 'FILL' triggers filling of the burette in all modes. May also serve as emergency stop. If the exchange unit is already filled, filling is not executed.

4.2.6 C

CLEAR, not live, 1-byte command

'CLEAR' resets volume display to 0.000 ml.

4.2.7 I

Information, live, 1-byte command Command 'I' (information) makes the Dosimat send information bytes terminated by 'CR' + 'LF'. These information bytes contain the information READY, CODE, LOCK, LIMIT etc. Command 'I' is also active at "REM OFF".

Information byte 1:

Bit Function

Cylinder code:

Bit 1 ml 5 ml 10 ml 20 ml 50 ml

0 0 1 1 1 1

1 1 0 1 0 1

2 1 0 1 1 0

0 Cylinder code

1 Cylinder code

2 Cylinder code

3 1 =no exch. unit

4 1 = New exchange unit

5 1 = Ready

6 1 =V-LIM reached

765 Dosimat

4.2 Control commands

Information byte 2:

Bit Function

0 1= Wrong command code

1 1 = Parameter corrected to its limit value

2 1 = Repeat command in the READY state

3 1 = Cylinder empty

4 1 = Remote control on

5 1 = Data transfer on (send RS232 on)

6 Reserve

4.2.8 DOS

Mode DOS, not live Selection of standard mode DOS. The standard parameters (depending on the exchange unit) are loaded into the working memory. If the exchange unit is not filled, filling is executed.

4.2.9 DIS R

Mode DIS R, not live Selection of standard mode DIS R. The standard parameters (depending on the exchange unit) are loaded into the working memory. If the exchange unit is not filled, filling is executed.

4.2.10 DIS C

Mode DIS C, not live Selection of standard mode DIS C. The standard parameters (depending on the exchange unit) are loaded into the working memory. If the exchange unit is not filled, filling is executed.

4.2.11 PIP

Mode PIP, not live Selection of standard mode PIP. The standard parameters (depending on the exchange unit) are loaded into the working memory. If the exchange unit is not filled, filling is executed.

4.2.12 DIL

Mode DIL, not live Selection of standard mode DIL. The standard parameters (depending on the exchange unit) are loaded into the working memory. If the exchange unit is not filled, filling is executed.

4.2.13 MDO

Mode DOS with previous parameters, not live Selection of mode DOS without changing the actual parameters in the working memory. No filling of the exchange unit.

4.2.14 MDR

Mode DIS R with previous parameters, not live Selection of mode DIS R without changing the actual parameters in the working memory. No filling of the exchange unit.

765 Dosimat

4.2. Control commands

4.2.15 MDC Mode DIS C with previous parameters, not live Selection of mode DIS C without changing the actual parameters in the working memory. No filling of the exchange unit.

4.2.16 MPU ON

Mode PULSE on, not live Mode PULSE on. Mode PULSE is not equivalent to modes DOS, DIS R, DIS C, PIP or DIL. Mode PULSE runs before one of these modes. The parameters in the working memory remain unchanged and no filling is executed. In mode PULSE, 1/10 000 V(B) is dosed with every 'GO'. The maximal frequency of GOcommands is ≤ 500 Hz. This is equal to the maximum rate of 1 V(B)/20 s. Note: It is advantageous to run mode PULSE before mode DOS or DIS C, because in these two modes V-LIM is active. Mode PULSE has to be left

with "MPU OFF".

4.2.17 MPU OFF

Mode PULSE off, not live Mode PULSE off. The background mode is reactivated in the working memory. No parameters are changed and no filling is executed.

4.2.18 MST X

Mode store under address X, not live X = 0... 9, J Storing the actual mode with the corresponding parameters under address X. The content of the working memory remains unchanged. Store J is only accessible via remote control and serves e.g. to store the actual mode after "REM ON".

4.2.19 MRC X

Mode recall with address X, not live X = 0 ... 9, J Recalling a mode with the corresponding parameters from the user memory. Mode CNT D is not loaded into the working memory and bit 0 of information byte 2 is set to 1.

4.2.20 PBL VALUE

Parameter 'blank', live Value = -999.999 ... +999.999 Setting blank in ml. In mode DOS only, in other modes, the command is not accepted and bit 0 of information byte 2 is set.

4.2.21 PFA VALUE

Parameter 'factor', live Value = -1E33 ... -1E-37 , 0 , 1E-37 ... 1E33 Setting factor. In mode DOS only, in other modes, the command is not accepted and bit 0 of information byte 2 is set to 1.

765 Dosimat

4.2 Control commands

4.2.22 PSM VALUE Parameter 'smpl', live Value = -1E33 ... -1E-37 , 0 , 1E-37 ... 1E33 Setting sample size. In mode DOS only, in other modes, the command is not accepted and bit 0 of information byte 2 is set to 1.

4.2.23 UNI X

Unit, live

X = 0 ... 9, J, K Selecting the unit: X = 0, % X = 1, g X = 2, mg X = 3, g/l X = 4, mg/l X = 5, mol X = 6, mol/l X = 7, ml X = 8, l X = 9, /pc (per piece) X = J, no unit X = K, ppm In mode DOS only, in other modes, the command is not accepted and bit 0 of information byte 2 is set to 1.

4.2.24 VUP VALUE

Rate up, live Value = 0.001 ... 150.0 Setting rate up in ml/min. If rate up is set to 'analogue', it is changed automatically to rate up digital. Input range depends on the cylinder volume of the exchange unit:

Cylinder

rate

min

ml/min

rate

max

ml/min

1 0.001 3

5 0.005 15

10 0.010 30

20 0.020 60

50 0.050 150

If a value is entered which is too high or too low, resp., the Dosimat corrects the value automatically to rate

4.2.7). To set rate

or rate

max

it is therefore possible to always enter 150 ml/min.

max ,

resp. and sets bit 1 of information byte 2 to 1 (see

min.

4.2.25 VDW VALUE

Rate down, live Value = 0.001 ... 150.0 Setting rate down in ml/min. If rate down is set to 'analogue', it is changed automatically to rate down digital. Input range depends on the cylinder volume of the exchange unit:

765 Dosimat

4.2. Control commands

Cylinder

rate

min

ml/min

rate

max

ml/min

1 0.001 3

5 0.005 15

10 0.010 30

20 0.020 60

50 0.050 150

If a value is entered which is too high or too low, resp., the Dosimat corrects the value automatically to rate

4.2.7). To set rate

or rate

max

it is therefore possible to always enter 150 ml/min.

max ,

, resp. and sets bit 1 of information byte 2 to 1 (see

min

4.2.26 VUA

Rate up analog, live Setting rate control to 'up analogue' (control via potentiometer (4)). A set value (VUP VALUE) is overwritten.

4.2.27 VDA

Rate down analog, live Setting rate control to 'down analogue' (control via potentiometer (4)). A set value (VDW VALUE) is overwritten.

4.2.28 VDS VALUE

Dispensing volume, not live Value = 0.001 ... 999.999 Setting the dispensing volume in ml. In modes DIS R and DIS C only, in other modes the command is not accepted and bit 0 of information byte 2 is set to 1. The entry is automatically corrected to a multiple of 1/10 000 V(B) depending on the volume of the cylinder:

Cylinder

Volume

ml/min

min

Volume

ml/min

max

1 0.001 999.999

5 0.001 999.999

10 0.001 999.999

20 0.002 999.999

50 0.005 999.999

If a value is entered which is too high or too low, resp. , the Dosimat corrects it automatically to volume

or volume

max

resp. and sets bit 1 of information byte 2 to 1 (see

min,

4.2.7).

4.2.29 VPI VALUE

Pipetting volume, not live Value = 0.001 ... 49.500 Setting the pipetting volume in ml. In modes PIP and DIL only, in other modes the command is not accepted and bit 0 of information byte 2 is set to 1.

765 Dosimat

4.2 Control commands

The entry is automatically corrected to a multiple of 1/10 000 V(B) depending on the volume of the cylinder:

Cylinder

Volume

ml/min

min

Volume

ml/min

max

1 0.001 0.900

5 0.001 4.9009

10 0.001 9.800

20 0.002 19.700

50 0.005 49.500

If a value is entered which is too high or too low, resp. , the Dosimat corrects it automatically to volume

or volume

max

resp. and sets bit 1 of information byte 2 to 1 (see

min,

4.2.7).

4.2.30 VDL VALUE

Diluting volume, not live Value = 0.001 ... 999.999 Setting the diluting volume in ml. In mode DIL only, in other modes the command is not accepted and bit 0 of information byte 2 is set to 1. The entry is automatically corrected to a multiple of 1/10 000 V(B) depending on the volume of the cylinder:

Cylinder

Volume

ml/min

min

Volume

ml/min

max

1 0.001 999.999

5 0.001 999.999

10 0.001 999.999

20 0.002 999.999

50 0.005 999.999

If a value is entered which is too high or too low, resp. , the Dosimat corrects it automatically to volume

or volume

max

resp. and sets bit 1 of information byte 2 to 1 (see

min,

4.2.7).

4.2.31 VLI VALUE

Security volume, not live Value = 0.001 ... 999.999 Setting the security volume in ml. In modes DOS, DIS C, and PULSE only, in other modes the command is not accepted and bit 0 of information byte 2 is set to 1. The entry is automatically corrected to a multiple of 1/10 000 V(B) depending on the volume of the cylinder:

765 Dosimat

4.2. Control commands

Cylinder

Volume

ml/min

min

Volume

ml/min

max

1 0.001 999.999

5 0.001 999.999

10 0.001 999.999

20 0.002 999.999

50 0.005 999.999

If a value is entered which is too high or too low, resp. , the Dosimat corrects it automatically to volume

or volume

max

resp. and sets bit 1 of information byte 2 to 1 (see

min,

4.2.7).

4.2.32 VLI OFF

Security volume off, not live Security volume control is switched off. In modes DOS, DIS C, and PULSE only, in other modes the command is not accepted and bit 0 of information byte 2 is set to 1. The value of V-LIM is overwritten.

4.2.33 AFI ON

Auto fill on, live

Function 'auto fill' is switched on.

4.2.34 AFI OFF

Auto fill off, live

Function 'auto fill' is switched off.

4.2.35 QDI

Query display, live Request to send content of display via RS232 interface. For example: "DIS C 13.457 ML 'CR' 'LF'"

4.2.36 QVO

Query volume value, live Request to send the volume value via RS232 interface. Do not query the volume when result calculation in Mode DOS is active! For example: " 13.457 'CR' 'LF'"

4.2.37 QPO

Query position of piston, live Request to send the content of the position counter via RS232 interface. The position counter (16 bit binary) gives the actual position of the piston. 0 = Initial position (filled) 10000 = Final position (empty)

765 Dosimat

4.2 Control commands

The binary value is transmitted in 4 bytes, where only the low-order nibble of a byte contains a 4 bit information. 1 2 3 4 5 6

byte: 20 ... 23

byte: 24 ... 27

byte: 28 ... 211

byte: 212 ... 215

byte: 'CR'

byte: 'LF'

Note: bytes 1...4 may have the value of 'CR' and 'LF' (0DH, 0AH)!

4.2.38 QPR

Query program version, live Request to send the program version via RS232 interface. For example: "Prog 020 DD 010 'CR' 'LF'"

4.2.39 QMO

Query mode, live Request to send the mode via RS232 interface. For example: "DIS C 'CR' 'LF'"

4.2.40 QPB

Query parameter 'blank', live Request to send the parameter 'blank' via RS232 interface. For example: "7.368 'CR' 'LF'"

4.2.41 QPF

Query parameter 'factor', live Request to send the parameter 'factor' via RS232 interface. For example: "-7.14578E-12 'CR' 'LF'"

4.2.42 QPS

Query parameter 'smpl', live Request to send the parameter 'smpl' via RS232 interface. For example: "23.75 'CR' 'LF'"

4.2.43 QVU

Query rate up, live Request to send the value for rate up via RS232 interface. For example: "37.5 'CR' 'LF'" If rate is set to 'analogue up', 1E34 is transmitted.

4.2.44 QVD

Query rate down, live Request to send the value for rate down via RS232 interface. For example: "37.5 'CR' 'LF'" If rate is set to 'analogue down', 1E34 is transmitted.

4.2.45 QAU

Query rate up 'analogue on/off', live Request to send the information rate up 'analogue on/off' via RS232 interface. For example: Analogue on "on 'CR' 'LF'" Analogue off " off 'CR' 'LF'"

765 Dosimat

4.2. Control commands

4.2.46 QAD

Query rate down 'analogue on/off', live Request to send the information rate down 'analogue on/off' via RS232 interface. For example: Analogue on "on 'CR' 'LF'" Analogue off " off 'CR' 'LF'"

4.2.47 QDS

Query dispensing volume, live Request to send the dispensing volume via RS232 interface. For example: "1.275 'CR' 'LF'" Transmission is only possible in modes DIS R and DIS C. In other modes, string "not defined 'CR' 'LF'" is transmitted.

4.2.48 QPI

Query pipetting volume, live Request to send the pipetting volume via RS232 interface. For example: "1.275 'CR' 'LF'" Transmission is only possible in modes PIP and DIL. In other modes, string "not defined 'CR' 'LF'" is transmitted.

4.2.49 QLI

Query limit volume, live Request to send the limit volume via RS232 interface. For example: "1.275 'CR' 'LF'" If V-LIM is 'off', the string "OFF 'CR' 'LF'" is transmitted. Transmission is only possible in modes DOS and DIS C. In other modes, string "not defined 'CR' 'LF'" is transmitted.

4.2.50 QDL

Query diluting volume, live Request to send the diluting volume via RS232 interface. For example: "1.275 'CR' 'LF'" Transmission is only possible in mode DIL. In other modes, string "not defined 'CR' 'LF'" is transmitted.

4.2.51 QUN

Query unit, live Request to send the unit via RS232 interface. For example: "mg/l 'CR' 'LF'" Transmission is only possible in mode DOS. In other modes, string "not defined 'CR' 'LF'" is transmitted.

4.2.52 QAF

Query 'auto fill on/off', live Request to send the information 'auto fill on/off' via RS232 interface. For example: auto fill on "on 'CR' 'LF'" auto fill off "off 'CR' 'LF'"

765 Dosimat

4.3 Handshake and other properties

Char 0

Char 1

Char n

Char 0

Char 1

Char n

4.3 Handshake and other properties

4.3.1 Handshake full

The arrows show the direction of the signal.

Dosimat as Receiver :

Dosimat external device

DTR

DCD

RxD

Notes:

• The DTR has to be active before the external device can transmit.

• The DTR has to be inactive before setting the DCD.

Dosimat as Transmitter:

Dosimat external device

RTS

CTS

DSR

DCD

TxD

Notes:

• During the whole transmission, the DCD has to be inactive (no duplex service).

• The CTS has to be inactive before the Dosimat sends 1 character.

DTR

DCD

RxD

Time

RTS

CTS

DSR

DCD

TxD

Time

4.3.2 Handshake none

The handshake lines are set by the Dosimat as above. The handshake lines are not checked by the Dosimat.

765 Dosimat

4.3. Handshake and other properties

4.3.3 General properties of the RS 232 interface

The Dosimat is configured as DTE (Data Terminal Equipment).

The RS 232 interface has the following technical specifications:

• Data interface according to the RS 232C standard, adjustable transfer parameters, see page 18.

• Control characters: C L

• Cable length: max. approx. 15 m

Start 7 Data Bit Parity Bit (even) 1 Stop Bit

Only a shielded data cable (for example, METROHM D.104.0201) may be used to connect the Dosimat with external devices. The cable shield must be properly grounded on both instruments (pay attention to current loops; always ground in a star-head formation). Only plugs with sufficient shielding may be used (for example, METROHM K.210.0381 with K.210.9045).

(ASCII DEC 13)

(ASCII DEC 10)

765 Dosimat

4.4 Pin assignment of the RS232 / I/O socket

4.4.1 I/O socket, 25 pins

external Function

+5 V

+12 V

+5 V

0 V

-12 V

A18

A16

A17

A20

A21

A11

A8 A3 A4/5 A2

Ready = L

= 30 V, IC = 20 mA

Limit volume reached = L VCE = 30 V, IC = 20 mA

Job end VCE = 30 V, IC = 20 mA

Pulses (10000). Appear with feed only. VCE = 30 V, IC = 20 mA

Fill = L; during filling

Feed = L; during dosing

Change to step operation = L. 1 Dosing pulse on A20 triggers 1/10000 of buret volume. VIL ≤ 0.4 V

≥ 2 V

≤ 0.6 mA

0 mV ... 1000 mV I

≤ 5 mA

Analog Ground

≤ 30 mA

IL ≤ 80 mA

IL ≤ 30 mA

tp ca.150 ms

tp ca. 200 us

tp ≥ 1 ms

765 Dosimat

4.4. Pin assignment of the RS232 / I/O socket

4.4.2 RS232 interface, 25 and 8 pin sockets

Transmitted Data (TxD). If no data are transmitted, the line is held in the “ON” condition. Data will only be sent when CTS is in the ”ON” condition.

Received Data (RxD)

Request to Send (RTS) ON condition: Titrino is ready to send data.

Clear to Send (CTS) ON condition: Remote station is ready to receive data.

Signal ground (GND)

Data Terminal Ready (DTR) ON condition: Instrument is ready to receive data.

Data Set Ready (DSR) ON condition: Communication channel is connected.

Received Line Signal Detector (RLSD) ON condition: The connected device is ready to send data.

Protective earthing Direct connection from cable plug to the protective ground of the instrument.

Polarity allocation of the signals

- Data lines (TxD, RxD)

voltage negative (<-3 V): signal state ”ON” voltage positive (>+3 V): signal state ”ZERO”

- Control or message lines (CTS, RTS, DTR, DSR, RLSD)

voltage negative (<-3 V): OFF state voltage positive (>+3 V): ON state In the transitional range from +3 V to -3 V the signal state is undefined.

A25 and B7

A22 and B6

A14 and B8

A23 and B5

A4/5 and B1

A19 and B4

A1 and B3

A24 and B2

765 Dosimat

4.4 Pin assignment of the RS232 / I/O socket

Definition of signal states

- Data interchange circuits (TxD, RxD) voltage negative (<-3 V): marking condition voltage positive (>+3 V): spacing condition

- Timing and control interchange circuits (CTS, RTS, DTR, DSR, RLSD) voltage negative (<-3 V): OFF condition voltage positive (>+3 V): ON condition In the transitional range from +3 V to -3 V the signal state is undefined.

Driver 1488 according to EIA RS 232C specification Receiver 1489A according to EIA RS 232C specification

Ordering numbers for 25 pin plug (socket A): K.210.9004 (shell) and K.210.002

Important: The pin numbers are not used according to the RS232 standard version. Therefore do not plug in standard RS232 cables!

Ordering number for 8 pin plug (socket B): K.101.0004

No liability whatsoever will be accepted for damage caused by improper interconnection of instruments.

765 Dosimat

4.4. Pin assignment of the RS232 / I/O socket

765 Dosimat

5.1 Technical specifications

5 Appendix

5.1 Technical specifications

Exchange units 1, 5, 10, 20, 50 mL burette cylinder volumes,

preferably with flat cock for automatic cock changeover

Resolution 10'000 pulses per 100% of burette volume

Exactitude Metrohm dosimats and exchange units meet the requirements

of ISO/EN/DIN Standard 8655-3 "Piston-operated volumetric apparatus – Part 3: Piston burets" and DIN Standard 12 650.

Limits according to ISO/EN/DIN 8655-3

Cylinder

volume

1 mL ± 0.6% ± 6 µL ± 0.1% ± 1 µL

5 mL ± 0.3% ± 15 µL ± 0.1% ± 5 µL 10 mL ± 0.3% ± 20 µL ± 0.07% ± 7 µL 20 mL ± 0.2% ± 40 µL ± 0.07% ± 14 µL 50 mL ± 0.2% ± 100 µL ± 0.05% ± 25 µL

Dispensing time for 100% of burette cylinder volume

analogue setting 20 s ... app. 17 min digital setting 20 s ... app. 17 h

Modes

DOS Dosing, with the ability to calculate a result from the dosed

DIS R Repetitive Dispensing DIS C Cumulative Dispensing PIP Pipetting DIL Diluting CNT D Preparation of solutions with preselected content

User memory for 10 complete user modes

Data outputs

digital Data transfer interface according to RS 232 C analogue Representation Volume as voltage signal: 0 ... 1000 mV = 1, 2 ... 10 burette

Resolution 1 mV

Max. permissible system. error

Metrohm agencies throughout the world offer you the possibility of checking the accuracy of your exchange units and Dosimats locally and also of certifying them. If the dosing cylinder and/or piston of an exchange unit are replaced then we recommend that an accuracy check is carried out.

volume

cylinder volumes (selectable)

Max. permissible random error

765 Dosimat

5.1. Technical specifications

Display LCD, 16 characters

Size of characters: 4.84 x 8.01 mm

Material Cabinet Polybutylene terephthalate (PBTP) Key cover Polycarbonate (PC)

Ambient temperature Nominal functional range +5... +40°C

Storage, transport - 40... +60°C

Safety specifications Designed and tested in accordance to IEC-Publication 1010,

safety class I. This manual contains some information and warnings which have to be followed by the user to ensure safe operation and to retain apparatus in safe condition.

Power supply Voltage 100, 117, 220, 230/240 V ± 10% (adjustable) Frequency 50... 60 Hz Consumption 15 VA Fuse Thermal fuse (100°C)

Dimensions Dosimat with exchange unit Width 150 mm Height 450 mm Depth 275 mm Titrating stand with exchange unit Width 240 mm Height 450 mm Depth 275 mm

Weight Dosimat with keyboard app. 3.2 kg as titrating stand app. 4 kg

765 Dosimat

5.2 Warranty and certificates

5.2.1 Warranty

The warranty regarding our products is limited to rectification free of charge in our workshops of defects that can be proved to be due to material, design or manufacturing faults which appear within 12 months from the day of delivery. Transport costs are chargeable to the purchaser.

For day and night operation, the warranty is valid for 6 months.

Glass breakage in the case of electrodes or other glass parts is not covered by the warranty. Checks which are not a result of material or manufacturing faults are also charged during the warranty period. For parts of outside manufacture insofar as these constitute an appreciable part of our instrument, the warranty stipulations of the manufacturer in question apply.

With regard to the guarantee of accuracy, the technical specifications in the Instructions for Use are authoritative.

Concerning defects in material, construction or design as well as the absence of guaranteed features, the purchaser has no rights or claims except those mentioned above.

If damage of the packaging is evident on receipt of a consignment or if the goods show signs of transport damage after unpacking, the carrier must be informed immediately and a written damage report demanded. Lack of an official damage report releases METROHM from any liability to pay compensation.

If any instruments and parts have to be returned, the original packaging should be used if at all possible. This applies above all to instruments, electrodes, burette cylinders and PTFE pistons. Before embedding in wood shavings or similar material, the parts must be packed in a dustproof package (for instruments, use of a plastic bag is imperative). If open assemblies are enclosed in the scope of delivery that are sensitive to electromagnetic voltages (e.g. data interfaces etc.) these must be returned in the associated original protective packaging (e.g. conductive protective bag). (Exception: assemblies with built-in voltage source belong in a non-conductive protective packaging). For damage which arises as a result of noncompliance with these instructions, no warranty responsibility whatsoever will be accepted by METROHM.

765 Dosimat

5.2. Warranty and certificates

5.2.2 Certificate of Conformity and System Validation

This is to certify the conformity to the standard specifications for electrical appliances and accessories, as well as to the standard specifications for security and to system validation issued by the manufacturing company.

Name of commodity: 765 Dosimat System software: Stored in ROMs Name of manufacturer: Metrohm Ltd., Herisau, Switzerland

This Metrohm instrument has been built and has undergone final type testing according to the standards:

Electromagnetic compatibility: Emission EN50081-1/92, EN55022/class B, EN55011/class B Generic emission

Electromagnetic compatibility: Immunity EN50082-1/92 Immunity IEC1000-4-2/95 (level 4), NAMUR/93 Static discharge IEC801-3, ENV50140/93+ENV50204/93 (level 2) Radiated rf electromag.field immunity IEC801-4, IEC1000-4-4/95 (level 3) El.fast transient requirements IEC801-5, IEC1000-4-5/95 (level 2/3) "Surges" immunity NAMUR/93 Paragr. 3.2.2., IEC1000-4-11/94 Voltage dips, short interruptions

Security specifications

IEC1010 class1, EN61010 class1, UL3101-1, EN60947:IP31

The technical specifications are documented in the instruction manual. The system software, stored in Read Only Memories (ROMs) has been validated in connection with standard operating procedures in respect to functionality and performance. The features of the system software are documented in the instruction manual.

Metrohm Ltd. is holder of the SQS certificate of the quality system ISO 9001 for quality assurance in design/development, production, installation and servicing.

Herisau, May 14, 1998

Dr. J. Frank Ch. Buchmann

Development Manager Production and Quality Assurance Manager

765 Dosimat

5.2 Warranty and certificates

Ionenanalytik • Analyse des ions • Ion analysis • Análisis iónico

765 Dosimat

EU- Declaration of Conformity

The company Metrohm AG, Herisau, Switzerland, certifies herewith, that the following instrument:

765 Dosimat

meets the CE mark requirements of EU Directives 89/336/EWG and 72/23/EWG.

Source of specifications:

EN 50081-1 Electromagnetic compatibility, basic specification Emitted Interference EN 50082-1 Electromagnetic compatibility, basic specification Interference Immunity EN 61010 Safety requirements for electrical laboratory measurement and control

equipment

Description of apparatus:

Universal microprocessor-controlled dispensing unit for liquid handling in laboratories.

For titrating and dosing tasks.

Herisau, May 20, 1998

Dr. J. Frank Ch. Buchmann

Development Manager Production and

Quality Assurance Manager

765 Dosimat

5.3. Connection of a balance

5.3 Connection of a balance

The balance is connected to the RS232 output (6) of the Dosimat.

Connecting cable: Sartorius, MP 8, YDO01... 3.980.3380 Mettler AE, Option 011 3.980.3370 + cable by Mettler: Hand switch ME

42500 or foot switch ME 46278 Mettler AT (15 pin) Cable by Mettler: ME 33640 Mettler, AM/PM: Cable by Mettler: ME 33640 + T-Adapter ME47473 +

Hand switch ME 42500 or foot switch ME 46278 Mettler, AB/AG (LC-RS25): 3.980.3370 + cable by Mettler: LC-RS25

(Adjustments 7 5 2) Mettler, PG: 3.980.3370 + 6.2125.130 AND Cable on demand Precisa Cable on demand

Note

• Select the correct balance on the Dosimat (special key 5, see page 18).

• Select the baud rate of the Dosimat such that it corresponds with that of the balance

(special key 1, see page 18).

• Select handshake "none" (special key 6, see page 18).

• Weights can be transferred to parameter "s" of the Dosimat with the aid of a transfer

key on the balance:

- In DOS mode with display s = .

- In CNT D mode with display s g (substance size).

• If another instrument is to be connected to socket A of the Dosimat in addition to the

balance, the 6.2125.000 double plug is available.

• The balance must transmit in mode "g".

5.4 Connection of a printer

The printer is connected to the RS232 output (6) of the Dosimat.

Important: Switch Dosimat on first, then printer.

Connecting cable:

Seiko DPU-414 6.2124.060 + 6.2125.130 Citizen iDP562 6.2124.070 Epson LQ, FX with interface #8148 6.2124.070 Epson LX-300 6.2124.070

Printer:

Seiko DPU-414, 230 V 2.141.0014 Seiko DPU-414, 120 V 2.141.0015 Citizen iDP562, 230 V 2.140.0024 Citizen iDP562, 115 V 2.140.0025

765 Dosimat

5.5 Continuous dosing with two Dosimats

Two 765 Dosimats are suitable for continuous dosing. The two 765 Dosimats are connected with cable 3.980.3140 via both interfaces RS232 (6).

Procedure

• Select mode DIS C in both Dosimats.

• Set on both Dosimats the dispensing volume equal to the volume of the mounted

exchange unit (V-DIS = If one of the Dosimats is started and reaches the preselected dispensing volume, this triggers the start of the other Dosimat, etc.

• Prerequisite for continuous dosing is that the filling rate is higher than the expelling rate

(while one Dosimat is expelling, the other one is refilling i.e. in addition to the movement of the piston two turns of the cock are necessary, about 2 s for each turning). Example: rate ↑ ≤ 0.85 rate ↓

At high rates, the effective expelling rate can deviate from the set rate by max. 4 % as a result of the finite resolution of the digital rate control, but the effective rate is held constant with quartz crystal accuracy.

Vburette

for the smaller of the exchange unit

max

If dosing to a fixed end volume V is envisaged, V-LIM is set according to the following rules:

• Calculation of the number of complete cycles N (V

and V2 be completely expelled):

V N = INT ———— (integral quotient)

• Calculation of the remaining volume V V

= V - N * (V1 + V2)

• In case the remaining volume is V

Settings on Dosimat 1: V-LIM(1) = OFF VDIS(1) = V

• In case the remaining volume is V

Settings on Dosimat 1: V-LIM(1) = V - N * V VDIS(1) = V

• In case the remaining volume is V

Settings on Dosimat 1: V-LIM(1) = OFF VDIS(1) = V

+ V2

=0, Dosimat 2 is the final burette.

Settings on Dosimat 2:

* V2

≠0 and V

V-LIM(2) = N V-DIS(2) = V

≤ V1 , Dosimat 1 is the final burette.

Settings on Dosimat 2:

V-LIM(2) = OFF V-DIS(2) = V2

≠0 and VR > V1, Dosimat 2 is the final burette.

Settings on Dosimat 2: V-LIM(2) = V - V V-DIS(2) = V

* (N + 1)

with V

cylinder volume on Dosimat 1 (start Dosimat)

cylinder volume on Dosimat 2

765 Dosimat

5.5. Continuous dosing with two Dosimats

Example:

Continuous dosing of 55 mL. Exchange units with volumes of 20 mL and 10 mL.

Key: End volume V = 55 mL Exchange unit 1 V1 = 20 mL Exchange unit 2 V2 = 10 mL

1. N = Int———— = 1 20+10

2. VR = 55 - 1*(20+10) = 25

3. 25 (VR) is larger than 20 (V1), i.e. Dosimat 2 is the final burette.

4. V-LIM for Dosimat 2 is: 55-20*(1+1) = 15

Settings: Dosimat 1 (start Dosimat) Dosimat 2 (final Dosimat) 20 mL Exchange unit 10 mL Exchange unit V-DIS = 20 mL V-DIS = 10 mL V-LIM = OFF V-LIM = 15 mL rate ↑ = 25.5 mL/min rate ↑ = 25.5 mL/min rate ↓ = 60 mL/min rate ↓ = 30 mL/min

The rate ↑ of 25.5 mL/min is the highest possible value for the predefined configuration.

765 Dosimat

5.6 Scope of delivery and ordering designations

Dosimat 765 ......................................................................................2.765.0010

including the following accessories:

1 Push button cable ............................................................................................ 6.2107.000

1 Keypad for Dosimat 765.................................................................................... 6.2149.000

1 Key for Exchange units......................................................................................6.2739.010

1 806 Exchange Unit with 20 mL glass cylinder .................................................. 6.3026.220

1 Power cable with cable socket, type CEE(22), V Cable plug to customer's specifications

type SEV 12 (Schweiz...)..................................................................................6.2122.020

type CEE(7), VII (Deutschland...)..................................................................... 6.2122.040

type NEMA/ASA (USA...) ................................................................................. 6.2122.070

1 Instructions for Use for Dosimat 765................................................................. 8.765.1023

1 Quick References for Dosimat 765.................................................................... 8.765.1013

Dosimat 765 with built-in analogue output ................................................2.765.0020

Accessories the same as with 2.765.0010.

Dosimat 765 as titrating stand ...................................................................2.765.0030

including the following accessories:

1 Magnetic stirrer ............................................................................................ 1.728.0010

1 Magnetic stirring bar, 16 mm ............................................................................ 6.1903.020

1 Magnetic stirring bar, 25 mm ............................................................................ 6.1903.030

1 Base plate with stand rod..................................................................................6.2001.010

1 Clamping ring for electrode holder.................................................................... 6.2013.010

1 Electrode holder ............................................................................................ 6.2021.020

1 Push button cable ............................................................................................ 6.2107.000

1 Keypad for Dosimat 765.................................................................................... 6.2149.000

1 Key for exchange units ...................................................................................... 6.2739.010

1 806 Exchange Unit with 20 mL glass cylinder .................................................. 6.3026.220

1 Power cable with cable socket, type CEE(22), V Cable plug to customer's specifications

type SEV 12 (Schweiz...)..................................................................................6.2122.020

type CEE(7), VII (Deutschland...)..................................................................... 6.2122.040

type NEMA/ASA (USA...) ................................................................................. 6.2122.070

1 Instructions for Use for Dosimat 765.................................................................8.765.1003

1 Quick References for Dosimat 765.................................................................... 8.765.1013

Dosimat 765 with built-in analogue output, as titrating stand ..................2.765.0040

Accessories the same as with 2.765.0030.

765 Dosimat

5.6. Scope of delivery and ordering designations

Options

Accessories to separate order and on payment of extra charge:

806 Exchange Unit 6.3026.xxx

Buret unit for Metrohm Dosimats, Titrinos, Titrandos; with glass cylinder, PCTFE/PTFE flat cock and built-in data chip

806 Exchange Unit with 1 mL glass cylinder ....................................................... 6.3026.110

806 Exchange Unit with 5 mL glass cylinder ....................................................... 6.3026.150

806 Exchange Unit with 10 mL glass cylinder ..................................................... 6.3026.210

806 Exchange Unit with 20 mL glass cylinder ..................................................... 6.3026.220

806 Exchange Unit with 50 mL glass cylinder ..................................................... 6.3026.250

Ceramic flat cock ................................................................................................. 6.1542.010

Stirrer and working equipment

728 Magnetic stirrer.............................................................................................. 2.728.0040

Magnetic stirring bars, length

12 mm............................................................................................................6.1903.010

16 mm............................................................................................................6.1903.020

25 mm............................................................................................................6.1903.030

802 Rod stirrer...................................................................................................... 2.802.0010

Electrode holder..................................................................................................6.2021.020

Pipetting equipment ............................................................................................6.5611.000

Dosing Test: Automatic execution of GLP tests, PC program............................6.6025.000

Cables

Cable 765 Dosimat — 682, 686, or 678 Titroprocessor....................................... 3.980.3090

Cable 2 x 765 Dosimat — 682, 686, or 678 Titroprocessor................................. 3.980.3100

Cable 765 Dosimat — 670 Titroprocessor or 646 VA-Processor......................... 6.2124.010

Cable 765 Dosimat — 586 Labograph ................................................................ 3.980.3170

Cable 765 Dosimat — Dosimat 765 .................................................................... 3.980.3140

Double plug for 25 pin socket.............................................................................. 6.2125.000

Balance connection

Cable 765 Dosimat — Sartorius, MP 8, YDO01................................................... 3.980.3380

Cable 765 Dosimat — Mettler AE, Option 011 .................................................... 3.980.3370

Cable 765 Dosimat — Mettler AT (15 pin) ........................................from Mettler: ME 33640

Cable 765 Dosimat — Mettler, AM/PM ........................ from Mettler: ME 33640 + ME47473

Cable 765 Dosimat — Mettler, AB/AG (LC-RS25) ........3.980.3370 + from Mettler LC-RS25

Cable 765 Dosimat — Mettler, PG................................................ 3.980.3370 + 6.2125.130

Printer connection

Printer Seiko DPU-414, 230 V .............................................................................. 2.141.0014

Printer Seiko DPU-414, 120 V .............................................................................. 2.141.0015

Printer Citizen iDP562, 230 V................................................................................ 2.140.0024

Printer Citizen iDP562, 115 V................................................................................ 2.140.0025

Cable 765 Dosimat — Seiko DPU-414 ......................................... 6.2124.060 + 6.2125.130

Cable 765 Dosimat — Citizen iDP562 ................................................................. 6.2124.070

765 Dosimat

Index

Keys are marked with < >, display texts are in bold characters, and pages concerning the green part are printed in italic.

Accessories ........................................59

add V ..................................13

Analogue output ................................. 2

Number of V

............................... 18

Analog rate .......................................2, 6

Arrows...............................................2, 6

auto fill ..................................18

b ....................................8

balance ..................................18

Balance

Connection .................................. 56

Selection ...................................... 18

baud rate ..................................18

<BLANK>............................................8

Cables ................................................60

Calculations..........................................8

CE sign ...............................................55

Certificate............................................54

<CLEAR> ............................................2

cnt ..................................13

CNT D.................................................12

Connection

Balance........................................ 56

Printer........................................... 56

Power............................................. 3

Stirrer ...............................................3

Content .............................................12ff

Continuous dosing .............................57

Cumulative dispensing .........................9

cylinder empty !..................................19

D Data

Bit................................................. 46

Input............................................. 4ff

Output.....................................8, 37ff

Printing....................................8, 37ff

Transfer.......................................37ff

Transfer rate...................................18

Delivery ...............................................59

dens. ..................................13

Diagnose ..........................................21ff

Digital rate ............................................6

DIL ......................................................11

Diluting ............................................... 11

Diluting volume .................................. 11

DIS C .................................................... 9

DIS R .................................................... 9

Dispensing ........................................... 9

Dispensing volume ..............................9

Disturbances .................................... 19ff

DOS...................................................... 7

Dosing................................................7ff

Dosing key .....................................3, 59

Dosing rate........................................... 6

Dropping funnel .................................57

Earthing................................................ 3

Electronic dropping funnel................. 57

<ENTER>............................................ 4

error X ................................. 19

Error messages................................19ff

<EXP> ................................................4

Exchange unit .................................... 60

Expelling rate........................................ 6

f = ............................. 8, 12

<FACTOR>.........................................8

Factor ................................................... 8

<FILL> ................................................ 2

Filling rate.............................................6

Formula

for add V (CNT D)......................... 14

for result calculation (DOS) ............. 8

<GO> ................................................. 2

Handshake................................... 18, 45

INF ................................. 19

Initializing............................................ 30

ISO quality system .............................54

Keypad.................................................4

Limit volume ..................................... 7, 9

765 Dosimat

Index

M ................................. 13

<MODE> ............................................6

Mode

Load .............................................17

PULSE ..........................................38

Store .............................................. 17

Molality ......................................... 13, 14

NaN ................................. 19

no exch.unit! ................................. 19

Ordering designations ....................... 59

Parity (data transfer)...........................46

Pin assignment................................... 47

PIP ...................................................... 10

Pipetting ..........................................10ff

Equipment ....................................60

Volume .................................... 10, 11

Power

Connection .....................................3

Switch .............................................3

Voltage ............................................ 3

Printer connection .......................... 8, 56

Print-out................................................8

Program number ................................ 18

PULSE-Mode...................................... 38

RAM-Initializing................................... 30

<RATE> ..............................................6

<RECALL>........................................ 17

Rate ...................................................... 6

Remote control................................. 37ff

Repetitive dispensing...........................9

Report................................................... 8

Result

Calculations.................................... 8

Output .............................................9

RS232 HSHK ................................. 18

RS232

Interface........................................46

Handshake ...................................45

Control via .................................. 37ff

Parameter................................18, 46

s ................................. 13

s = ................................... 8

Scope of delivery................................ 59

Security volume................................7, 9

send RS 232 ................................. 18

special key 0..6 ................................. 18

Special settings ................................. 18

<SMPL> ............................................. 8

Standard parameter............................. 7

Stirrer connection................................. 3

Stirrer ................................................. 60

Stop bit .............................................. 46

<STORE> ......................................... 17

Storage .............................................. 17

Tandem dosing.................................. 57

Technical specifications .................... 51

unit ................................. 13

<UNIT>......................................... 8, 13

User memory ..................................... 17

V > XXXX ml ................................. 19

V < XXXX ml ................................. 19

#V(B) 1000 mV ................................. 18

V-DIL ................................. 11

V-DIS ................................... 9

V-LIM ............................... 7, 9

V-LIM reached! ................................. 20

<VOLUME>........................................ 4

volume<resol.! ................................. 20

V-PIP ........................... 10, 11

Warranty............................................. 53

Working modes.................................. 6ff

765 Dosimat

Metrohm 765 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Content

Overview

2 Operation with the keyboard

User memory

4.3 Handshake and other properties

Index