Metrohm 776 Dosimat Instructions For Use Manual Download Page 11

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2.2

Modes

776 Dosimat

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

max.

b=0; f=1; s=1

DIS R

–

OFF

max.

–

DIS C

0.1

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.

V-LIM OFF ml

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.

VOLUME

RATE

Summary of Contents for 776 Dosimat

Page 1: ...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 776 Dosimat Instructions for Use 8 776 1023 2005 06 ti dm ...

Page 2: ......

Page 3: ...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 29 3 4 Releasing a locked spindle with insertd Exchange Unit 30 4 Appendix 31 4 1 Technical specifications 31 4 2 Warranty and certificates 33 4 2 1 Warranty 33 4 2 2 Certificate of Conformity and Sys...

Page 4: ......

Page 5: ...Overview 776 Dosimat 1 Explanation of symbols means key e g GO means key GO DOS 0 000 ml means display ...

Page 6: ...OS 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 resp are specially important for very slow dosings where movements of the piston cannot be clearly identified 3 Operating keys at the Dosimat FILL Filling This key is always accessible and serves also as emergency stop CLEAR Resetting of the volume display to 0 with Dosimat in stand by...

Page 7: ... 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 8 Power switch Switching on and off Dosimat The 776 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 9 Earthing socket The 776 Dosimat must be grounded...

Page 8: ... 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 ...

Page 9: ...state the inquiry drum is left Enter ing 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 The resolution on the display is therefore depending on the mounted Exchange unit Exchange unit Resolution of display Volume mL Rate mL min Smallest increment V 1 mL 001 001 0 1 µL 5 mL 001 0...

Page 10: ...ata 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 The modes are selected by the inquiry drum MODE and confirmed with ENTER DOS DOSing Dosimat is dosing as long as GO is pressed Result calculation can be activated DIS R DISpensing Repetitive Dosimat is dosing a stored dispensin...

Page 11: ...ll modes which are loaded into the working memory by key MODE are equipped with a set of standard parameters Mode V DIS V PIP mL V LIM V DIL mL 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 V LIM...

Page 12: ... 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 ...

Page 13: ...01 999 999 mL 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 V DIS 0 1 ml V LIM OFF ml 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 s...

Page 14: ...ith 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...

Page 15: ...e 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 If mode DIL is loaded the disp...

Page 16: ...olume 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 sub stance mus...

Page 17: ...g L mg L Example ρ Pb2 1 g L Outdated mg Mass fraction w wi mi Σmj Units ppm 1 Example w H2O 5 Outdated weight percent Sequence of CNT D 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 ...

Page 18: ...ass concentration g L mg L f s 103 cnt f s 106 cnt Mass fraction ppm f s 102 cnt cnt dens f s 106 cnt cnt dens Molality mol kg mmol kg s 103 cnt M dens s 106 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 AnBm e g a standard of 10 ppm Pb2 prepared from Pb N...

Page 19: ...6H2O 0 24214 0 21494 SO4 2 K2SO4 0 55087 Pb2 Pb ClO4 2 3H2O Pb NO3 2 0 45028 0 62557 NO3 NaNO3 KNO3 0 72950 0 61319 PO4 3 Na2HPO4 12H2O Na3PO4 12H2O 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...

Page 20: ...e mark of the flask V0 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 cor...

Page 21: ...ORE RECALL Management of user memory 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 Fixed memory contains modes with standard parameters DOS DIS R DIS C PIP DIL CNT D RECALL 6 5 STORE 5 STORE Working memory contains 1 mode parameters can be modified User memory ...

Page 22: ...meaning 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 5 776 0010 Display of program number 3 auto fill on Automatical refilling in mode DOS if more than one burette volume has been ex...

Page 23: ...ring 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 cal culated with s 0 or the calculated result is larger than the range of numbers which can be displayed 1 E 39 Exit CLEAR ...

Page 24: ...elled 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 uni...

Page 25: ...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 func tionality In the case of a possible malfunction we advise you to perform either the corres...

Page 26: ...Remove exchange unit 3 Disconnect all cables at rear except mains cable and keyboard 4 Power on and simultaneously press key 9 and keep pressed until diagn key 0 9 5 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 exte...

Page 27: ...2 3 2 1 keys test 3 GO key rate The display requests to press the key RATE on the keyboard 6 2149 000 4 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 dis played 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 cance...

Page 28: ...play requests to press the key FILL on the front of the Dosimat 4 FILL CLEAR GO If the correct key was pressed and the test was positive the name of the next key to be pressed will be dis played 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 ...

Page 29: ...r the analog spindle speed rate adjustable with knob dV dt 1 Prepare instrument for diagnostic test see chap 3 2 3 2 Turn knob dV dt fully to the right 3 5 timer ana test 4 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 5 CLEAR diagn key 0 9 3 2 9 RAM test 1 Prepare instrument for diagnostic test see chap 3 2 3 2 8 R...

Page 30: ... exchange unit and put the burette tip into a collecting receptacle 2 Connect push button cable 6 2107 000 if available 3 Power off and wait for 5 s 4 Power on and simultaneously press key 0 and keep pressed until special key 0 6 5 3 auto fill check whether display reads on or off make note 6 Press GO if auto fill on otherwise go on with item 7 auto fill off 7 ENTER CLEAR The dotted pattern is dis...

Page 31: ...change unit removed and the locking switch in the right hand hole carefully actuated by means of a screw driver 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 17 Actuate FILL and simultaneously take the time until the dosimat is in ready position again Filling time one ...

Page 32: ...nter 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 The time must be 14 24 s 25 Reset the parameter if under 5 the reading was auto fill on ...

Page 33: ...ower off and wait 5 s 3 Power on and simultaneously press key FILL and keep pressed until RAM init 4 GO RAM init passed 5 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 PI...

Page 34: ... 2 screws M3 fillister head knob edge of bench 2 screws M4 countersunk Fig 4 1 Disconnect instrument from power supply 2 Remove control knob 3 Place instrument over edge of bench to allow the M3 screws to be removed 4 Remove M4 screws 5 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 6...

Page 35: ...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 Metrohm agencies throughout the world offer you the possibil ity of checking the accuracy of your exchange units and Dosi mats locally and also of certifying them If the dosing cylinder and or piston of an exchange unit are replaced then we rec ommend that an accuracy check is carried out Dispe...

Page 36: ...ications 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 ...

Page 37: ...aranteed 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...

Page 38: ...3 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 documente...

Page 39: ...ource 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 titra...

Page 40: ... 776 1013 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 U...

Page 41: ...ivery 36 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 Dosing rate 6 E Earthing 3 ENTER 4 error X 19 Error messages 19ff EXP 4 Exchange unit 36 Expelling rate 6 F f 8 12 FACTOR 8 Factor 8 FILL 2 Filling rate 6 Formula for add V CNT D 14 for result calculation DOS 8 G GO 2 I...

Page 42: ...g 9 Result Calculations 8 S s 13 s 8 Scope of delivery 36 Security volume 7 9 special key 0 6 18 Special settings 18 SMPL 8 Standard parameter 7 Stirrer connection 3 Stirrer 36 STORE 17 Storage 17 T Technical specifications 31 U unit 13 UNIT 8 13 User memory 17 V VOLUME 4 V XXXX ml 19 V XXXX ml 19 V DIL 11 V DIS 9 V LIM 7 9 V LIM reached 20 volume resol 20 V PIP 10 11 V PIP V B 20 W Warranty 33 Wo...

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