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Summary of Contents for Sartorius 2406
- Page 1 Digital Micro Balances 2406 Instructions for Installation and Operation...
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Page 2: Table Of Contents
Unpacking Installation Checking Weighing I Weighing II Checking of Balance Type 2406 Accuracy of Weight set Correction of the Weighing Result... -
Page 3: Unpacking
Unpacking Remove Styropor insert from carton Open Styropor box and lift balance out. -
Page 4: Installation
Installation Make sure that the floor is level, that you have a sturdy table, that there is no direct exposure to heat radiation or sun light, draft or vibrations. Recommended room temperature: 25°C, relative humidity 60% ± 5% Unpack accessories. Weight knob indication: „19,99". - Page 5 Remove outer and inner lid. Remove glass plate from weighing compartment. Check operating voltage: Place the balance with its back-side on the dust cover, open cover in the base plate, change connecting wires, if necessary.
- Page 6 Remove brackets at the ends of the locking bars for the weight knobs. Pull out bars sideways, be sure that no ring weights remain in the recess at the end of the bars. Detach tapes from damping pot and remove cover backwards.
- Page 7 Loosen nuts, swing aside springs and retighten nuts. Loosen nuts, swing aside springs and retighten nuts. Loosen nut, swing aside spring and retighten nut.
- Page 8 Remove beam, take off cardboard strip. Inspect knife edges and arrestment pins for cleanliness. Place beam on the arrestment pins. Turn cover of damper until it stops. Inspect stirrup plate for cleanliness and install („V" on the top of the plate faces toward the front of the balance).
- Page 9 Remove stirrup arrestment bow. Advance stirrups slightly, insert bow. „V" on the top of the plate faces toward the front of the balance. Place stirrups on stirrup plate. Attach pan bow.
- Page 10 Attach pan, swing in pan lifting device. Turn mechanical weight indicator and micrometer to zero. Level balance by observing the spirit level. Attach lamp housing. Connect balance to alternating current line.
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Page 11: Checking
Checking Arrest balance in half release position (beam release lever up). Focus scale image on screen. To adjust light intensity: Loosen knuried nut. Center lamp bracket and retighten nut. Arrest beam. - Page 12 For zero point and sensitivity control both lids must be in place. Release beam. Adjust zero point. lf the zero point cannot be adjusted by means of this knob, remove lids: Direction of rotation if indication is – Direction of rotation if indication is – Control of sensitivity: Place a 10 mg weight on the pan.
- Page 13 Set indication of mechanical weights to „00.00". Scale must indicate exactly .„100". Correction: Take out plug of lid. Direction of rotation if indication is below „100" Direction of rotation if indication is above „100" Carry out alternating control of zero point and sensitivity until both values are correct.
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Page 14: Weighing I
Weighing I Adjust zero point. Swing pan out, introduce glass-tube and swing pan back. Arrest balance in half release position. Turn weight knob of largest weight decade until scale swings back into the minus area, then dial back one decade. Proceed in the same way with the following smaller weight decades. -
Page 15: Weighing Ii
Weighing II Adjust zero point. Place objeet on the pan and return the pan to the weighing compartment. Move beam to the „half release" position. Turn knob of largest weight decade until the scale Swings back to the minus area, then turn weight knob back one decade. -
Page 16: Checking Of Balance Type 2406
Checking of Balance Type 2406 Set mechanical weight indicator to „19.99". Take the pan out. Pull off lamp bracket. Take off outer and inner lids. Lift stirrup bow slightly and take stirrup plate off. Pull off lid of damping pot (towards rear). -
Page 17: Correction Of The Weighing Result
Correction of the weighing result The built-in weights above 0.1 g are of non-corrosive non-magnetic steel (density 7.88 g/cm ). The weights below 0.1 g are made of a special aluminum alloy (density 2.7 g/cm ). For medium air density of 0.0012 g/cm they are adjusted to match brass weights of density 8.4 g/ml. - Page 18 The determination of atmospheric pressure and its influence on analytical weighings The demands in respect to the accuracy of analytical and especially of micro-analytical weighings are often extreme. Even though the accuracy required for the end result is usually only 1 %, the requirement of a much higher accuracy is conditioned by the necessity of also having to weigh the mass of the tare which often exceeds to a considerable degree that of the proper sample.
- Page 19 Calculating variations of atmospheric pressure The atmospheric pressure is governed by the barometer reading, which in turn depends on temperature and absolute air humidity. The latter can be determined from the relative humidity and temperature. The following equation indicates the relation between the change of air pressure in % and these factors.
- Page 20 Calculating the buoyancy difference Since the buoyancy is the weight of the replaced ∙ M the change of the buoyancy is = 12 ∙ wherein D must be entered as % age. If M is given in grams, A result from equation (2) by –3 entering for air buoyancy the median value of 1,2 x 10...
- Page 21 On the necessity of using corrections t is advisable to determine beforehand the approximate magnitude of the corrections which may have to be made. In the case of brass weights the buoyancy error is - 1,43) A ∙ 10 lf the deviations were less than 10 in which case the error would be no larger than 1 millionth of the sought result, then the buoyancy error remains below this value as long as the specific gravity is in excess of 5 and the air buoyancy change remains below 1 %.
- Page 22 Fig. 3 shows the correction factors for glass ( = 2,5) in relation to the mass of the sample and the change in air buoyancy. Abb. 3. Buoyancy corrections for glass ( = 2,5) against brass weights ( = 8,4) in relation lo various changes of air buoyancy D.
- Page 23 Determining the absolute weight in relation to vacuum These calculations are required when working with a vacuum balance when a substance is weighed once in air, then under vacuum or in another gas. In these cases the results should always be set in reference to vacuum. The procedure is as follows: Refer to publication ) if Optimum accuracy is required for the coarse determination of the absolute buoyancy.
- Page 24 Under conditions of this kind the Sartorius balance table or console can be recommended. lt is advisable to use a balance table or console even if the result of this test is negative.
- Page 25 Fluorescent room lighting should be used, if at all feasible. Otherwise, a Sartorius balance lamp with cold light tube can be obtained. Even the body of the operator can influence the performance of a balance, especially if it is used infrequently and if the doors are not opened repeatedly for the purpose of equalizing the inside and outside temperatures.
- Page 26 TECHNICAL DATA Digital Micro Balance 2406 Weighing range Built-in weight 0.01 — 19.99 Optical range 20 mg One scale division 0.1 mg Readability (micrometer) 0.001 mg Precision (standard deviation) 0.001 mg Literatur: Felgenträger, W.: Feine Waagen, Wägungen und Gewichte. Berlin 1932, S. 249-53 und Tabellen S. 297-302 Ulbrich t, H.: Die Berücksichtigung des Luftauftriebes bei analytischen Wägungen.
- Page 28 All rights reserved. No part of this publication may be printed or translated in any form or by any means without the prior written permission of Sartorius AG. Sartorius AG reserves the right to make change to the technology, features, specification and design of the equipment without notice.
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