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Summary of Contents for Metrohm 776 Dosimat
- Page 1 CH-9101 Herisau/Switzerland Tel. +41 71 353 85 85 +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...
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Page 3: Table Of Contents
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 System Validation..........34 4.3 Scope of delivery and ordering designations ............36 Index...........................37 776 Dosimat... - Page 5 Overview Explanation of symbols: < > means "key", e.g. <GO> means key "GO" means "display" DOS..0.000 ml 776 Dosimat...
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Page 6: Overview
<GO> is pressed. Setting of display contrast 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). 776 Dosimat... - Page 7 Power connection In power supply systems, in which strong HF interferences (transients) are su- perimposed on the power voltage, the 776 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.
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Page 8: Operation With The Keyboard
Resetting of the volume display to 0 with FILL CLEAR Dosimat in stand-by position. Start mode. With mode DOS, dosing goes on as long as <GO> is pressed. 6.2149.000 The keys <FILL>, <CLEAR>, <GO> are identical with the corresponding keys on Dosimat. 776 Dosimat... - Page 9 .050 If a volume value is entered which can not be dosed exactly with the Exchange unit mounted, the value is rounded off to the next possible one and stored accordingly. • Key <CLEAR> sets parameters to "OFF". 776 Dosimat...
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Page 10: Key
(V-DIS) remains displayed. PIP: PIPetting Aspirating and subsequent expelling of a stored pipetting volume. DIL: DILuting Aspirating a stored pipetting volume and subsequent expelling of the pipetting and diluting volume. CNT D: CoNTent Dispenser Preparation of solutions with preselected content. 776 Dosimat... -
Page 11: Mode Dos, Dosing
Dosimat is dosing as long as <GO> is pressed. Result calculation can be activated. Security volume: V-LIM OFF ml 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. RATE 776 Dosimat... - Page 12 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. 776 Dosimat...
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Page 13: Mode Dis R, Repetitive Dispensing
(V–DIS) remains displayed. Dispensing volume V-DIS 0.1 ml VOLUME Input range: 0.001...999.999 mL Security volume V-LIM OFF ml Dispensing is stopped, if V-LIM has been reached. Input range: 0.001...999.999 mL, OFF Expelling and filling rate, see page 6. RATE 776 Dosimat... -
Page 14: Mode Pip, Pipetting
Preparation step: Hold burette tip free at working prep. height. ↓ Ready to aspirate the pipetting volume: Immerse PIP 1 0.100 ml ↓ burette tip. <GO> ↓ Ready to expel the pipetting volume: Hold PIP 2 0.100 ml burette tip for pipetting. ↓ <GO> ↓ 776 Dosimat... -
Page 15: Mode Dil, Diluting
1.100 ml 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. 776 Dosimat... -
Page 16: Mode Cnt D, Content Dispenser
Mode CNT D is used to prepare solutions with a particular content. Doing this, the sub- stance must not be weighed-out to a particular value in order to obtain the preselected content but the 776 Dosimat dispenses the amount of solvent calculated correspond- ingly. - Page 17 V XXX.XXX ml with <GO>. ↓ ↓ With <CLEAR> the values for "cnt" and/or "s" can <GO> <CLEAR> be changed. This gives an idea of the ↓ approximate weighing. dosing V Pressing <MODE>, the mode can be changed. 776 Dosimat...
- Page 18 , e.g. a standard of 10 ppm Pb prepared from Pb(NO . The factor f is calculated from the formula: n*M(A) m*M(B) f = ———— f = ———— M(A): molar mass of ion A M(B): molar mass of ion B molar mass of substance A 776 Dosimat...
- Page 19 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. /V resp. ρi= mi/V where amount of substance i mass of substance i volume of the solution 776 Dosimat...
- Page 20 Several correction factors are shown in the following table: Concentration c 0.05 0.1 mol/L 1 mol/L mol/L Substance/solvent Potassium hydrogen 0.999 0.998 0.982 phthalate/water EDTA·2H O/water 0.991 0.981 NaCl/water 0.999 0.998 0.982 /water 0.998 0.997 0.960 CuSO O/water 0.995 0.992 0.904 776 Dosimat...
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Page 21: User Memory
Management of user memory STORE STORE RECALL <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. 776 Dosimat... -
Page 22: Special Settings
5.776.0010 < 3 > Automatical refilling in mode DOS if more than one auto fill burette volume has been expelled: on = yes; off = no. Press <GO> until the right answer is displayed and store with <ENTER>. 776 Dosimat... -
Page 23: Error Messages, Troubleshooting
The Dosimat is set to "auto fill off" and one burette volume has cylinder empty! been expelled in mode DOS. Exit: <FILL>. Check sum error in PROM. error 1 Remedy: Call Metrohm-Service. RAM-check: Error in on-chip-RAM. error 2 Remedy: Call Metrohm-Service. RAM-check: Error in off-chip-RAM. error 3 Remedy: Call Metrohm-Service. - Page 24 > V(B) 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 mount an Exchange unit where the volume can be expelled. 776 Dosimat...
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Page 25: Diagnosis
Whatever the case, it is always advisable to localise the fault with the diag- nostic tests, which can be performed quickly and simply. The customer need call Metrohm service only when the instrument really has a fault. Fur- ther, he can use the results of the specific diagnostic function to provide the service engineer with much more precise information. - Page 26 ╠══ < 7 > Instrument adjustment spind. mot. cal. ║ ╠══ < 8 > RAM TEST ║ ╚══ < 9 > RAM init. This diagnostic step is reserved for the service engineer and therefore will not be described within this document. 776 Dosimat...
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Page 27: Diagnosis Of Cylinder Code
- 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 Prepare instrument for diagnostic test (see chap. 3.2.3). 776 Dosimat... -
Page 28: Diagnosis Of Digital Timer
After pressing the last key (GO), the following appears: keys o.k. <CLEAR> diagn. key 0...9 Fig. 1 3.2.7 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. 776 Dosimat... -
Page 29: Diagnosis Of Analog Timer
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 3.2.10 Diagnosis of spindle zero and cock changeover Power off. 776 Dosimat... -
Page 30: Diagnosis Of Spindle Drive
Press <GO> if auto fill 'on' otherwise go on with item 7. auto fill <ENTER>, <CLEAR> The dotted pattern is displayed, afterwards the display changes to the mode used last before starting the di- agnosis. Dosimat fills. Actuate <MODE> several times until the display shows: < ENTER > 776 Dosimat... - Page 31 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 <VOLUME> V-DIS 1. ml 776 Dosimat...
- Page 32 <GO> (depress briefly) and with a stop watch take the time until the cock starts turning. The time must be 14 ... 24 s. Reset the parameter if under 5. the reading was auto fill = on . 776 Dosimat...
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Page 33: Ram Initialisation
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: Baudrate: 9600 Baud auto. filling: 776 Dosimat... -
Page 34: Releasing A Locked Spindle With Insertd Exchange Unit
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.) 776 Dosimat... -
Page 35: Appendix
± 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. - Page 36 100, 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 Weight Dosimat with keyboard app. 3.1 kg 776 Dosimat...
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Page 37: Warranty And Certificates
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 pack- aging should be used if at all possible. -
Page 38: Certificate Of Conformity And System Validation
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. - Page 39 Ionenanalytik • Analyse des ions • Ion analysis • Análisis iónico 776 Dosimat EU- Declaration of Conformity The company Metrohm AG, Herisau, Switzerland, certifies herewith, that the following instrument: 776 Dosimat meets the CE mark requirements of EU Directives 89/336/EWG and 72/23/EWG.
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Page 40: Scope Of Delivery And Ordering Designations
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 ............ -
Page 41: Index
<MODE> ..........6 DIS C ............9 Mode DIS R.............9 Load ..........17 Dispensing..........9 Store ..........17 Dispensing volume.......9 Molality ......... 13, 14 Disturbances ........19ff DOS ............7 Dosing ..........7ff ......... 19 Dosing key..........3 ......... 19 no exch.unit! Dosing rate ...........6 776 Dosimat... - Page 42 0..6 Special settings........18 <SMPL>..........8 Standard parameter ......7 Stirrer connection ......... 3 Stirrer ..........36 <STORE> ......... 17 Storage..........17 Technical specifications ..... 31 ......... 13 unit <UNIT> ......... 8, 13 User memory........17 776 Dosimat...
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