Digital Analytical Balances

2400

Instructions for Installation and Operation

2

Contents page

Installation 3 Balances without tare weight indication 12 Balances without "Auto-Arrest" 14

Checking 17

Weighing, regular 21 Balances without pro weighing 23

Weighing to a pre-set value 24 Balances without tare weight indication 26 Weighing to a pre-set value using balances without taring device 28

Special Accessories 29 Weighing below the balance 31

Correction of the weighing result 33

Technical Data 34

3

Installation Note: Required is a stable floor and a sturdy table. No

heat radiation, no draught. Remove Polystyrene insert from carton.

1 Open Polystyrene insert and take the balance out.

2

4

Remove plastic cover and taps.

3 Remove accessories Container from the balance. Take out the accessories. Lift hood off balance housing.

4 To change the voltage setting: Place the balance with its back on a suitable soft cushion. Open the oblong slider on the bottom cover plate and change connections on the terminal strip to the desired voltage.

5

5

Push-button switch for the arrestment: 1: beam fully arrested 2: pre-weighing switched in 3: beam fully released

6 Tare weight indication: Push lever to the left.

7 Net weight indication: Push lever to the right.

8

6

Connect balance to the power supply. lf one of the push-button switches lights up press switch No. 1 (beam fully arrested).

9 Weight indication must show maximum built-in weights.

10 Remove rubber band. Loosen two nuts. Leave U-bracket (stirrup) undisturbed.

11

7

Loosen the two screws in the weighing compartment. Pull down plate carefully.

12 Remove wooden blocks, cardboard and foam rubber insert.

13 Install weight carrier so that the opening of the hook points towards right and attach it to U- bracket. Fasten plate inside the weighing compartment.

14

8

Loosen two knuried nuts. Swing leaf springs aside by 90 and re-tighten nuts to prevent accidental displacement of the springs.

15 Remove clip by pulling out paper strip.

16 Turn knob counter clockwise to stop.

17

9

Loosen knuried nuts. Swing leaf spring aside by at least 90, re-tighten nuts to prevent springs from moving accidentally. Pull out locking pin and store for oossible future use.

18 Lift beam carefullv and remove Daoer strios.

19 Attach pan so that the opening of the hook points towards right.

20

10

Insert stirrup plate with V-mark facing operator. Remove foam rubber from weight carrier and attach same.

21 Level balance by adjusting the front feet while observing the spirit level.

22 Insert micrometer knob and turn micrometer to "00".

23

11

Turn tare weight application to "000".

24 Turn net weight application to "000".

25

12

Balances without tare weight indication The installation is carried out as from item No. 1 to 23 except 7 and 8. Instead of Illustration No. 6: Push-button switch for the arrestment: 1: beam fully arrested 2: pre-weighing switched in 3: beam fully released

26 Instead of Illustration No. 10: Weight indication must show maximum built-in weights.

27 According to illustration No. 23: Turn weight application to "000".

28

13

Semi-micro batances: attach lamp housing.

29

14

Balances without "Auto arrest" The installation is carried out as from item No. 1 to 23 except No.6. Arrestment-Lever on pre-weighing balances: 1: beam fully arrested 2: pre-weighing position 3: beam fully released

30 Indication lights: Green light: pre-weighing switched in Red light: beam fully released

31 Arrestment-Lever on balances without pre-weighing: 1: beam fully arrested 2: beam in half release position 3: beam fully released

32

15

Indication light: The red light indicates that the beam is fully released.

33 Instead of illustration No. 9: Connect balance to the power supply. Arrestment lever in position 1, beam fully arrested.

34 Instead of illustration No. 10: Weight indication must show maximum built-in weights.

35

16

According to illustration No. 23: Turn weight application to "00".

36

17

Checking Even though every balance leaves the factory in perfectly adjusted condition, slight changes may occur in transit. Release beam fully and focus projection scale.

37 Adjusting light intensity: Loosen knurled screw. Adjust plate until best illumination is reached and tighten screw again.

38 Adjusting light intensity: Loosen knurled screw. Adjust plate until best illumination is reached and tighten screw again.

39

18

Switch-in pre-weighing. Adjust zero point.

40 Place hood on to balance. Close sliding doors.

41 Release beam fully and adjust zero point.

42

19

lf adjusting range according to item no. 42 is insufficient: Arrest balance. Lift the hood off the balance housing in case of minus deflection in case of plus deflection

43 Sensitivity control: Place on the pan a weight which is equivalent to the optical scale rnge. Switeh lowest weight ctecade to 1". Release balance. Adjust zero point.

44 Turn weight application to 0". Scale swings throligh and must indicate exactiy 100".

45

20

correct Sensitivity:

if scale does not come up to 100" if scale Swings beyond 100"

One turn approx. 0.5 mg.

46

21

Weighing, regular Check zero point and adjust, if necessary. Place load on pan and switch-in pre-weighing.

47 Set weight application to scale value indicated directiy below pointer.

48 lf scale moves beyond 100" switch highest decade until scale swings in".

49

22

Arrest beam. After waiting for a few seconds release beam fully. When projection scale stops swinging turn micrometer until pointer coincides with one of the lines of the projection scale. Weight indication: 57.2325 g.

50

23

Balances without Sartorius pre-weighing: Check zero point and adjust, if necessary. Place load on pan and switch arrestment lever up to position 2.

51 Turn knob of the highest decade until the word Tare" appears on the screen, then go back one Step. Operate the other decades likewise.

52 Arrest beam. After waiting for a few seconds release beam fully. When projection scale stops swinging turn micrometer until pointer coincides with one of the lines of the projection scale. Weight indication 57.2325 g.

53

24

Weighing to a pre-set value Place tare vessel on pan. Switch-in pre-weighing.

54 Turn tare weight application to value indicated directly below pointer.

55 Arrest beam and release beam fully after a few seconds.

56

25

Use taring device to adjust projection scale to "00".

57 Example: pre-set value: 2.485 g Turn net weight application to "2". Set micrometer to "50". Add substance until projection scale indicates "48".

58

26

Balances without tare weight indication: Place tare vessel on pan. Switch-in pre-weighing.

59 Turn weight application to value indicated directly below pointer.

60 Arrest beam and release beam fully after a few seconds.

61

27

Use taring device to adjust projection scale to 00.

62 Example: pre-set value 2.485 g Turn weight application to "59". Set micrometer to "50". Add substance until projection scale indicates "48".

63

28

Weighing to a pre-set value using balances without taring device Determine weight of tare vessel according to item 46 to 49 or 50 to 52. Example: Tare vessel 57,2325 g pre-set value 2,4850 g 59,7175 g

64 Turn weight application to "59". Set micrometer to "75". Add substance until projection scale indicates "71".

65

29

Special Accessories lf ordered later specify model for which the accessories are meant. lf tared weighing boats are to be used switch weight application to 20 g.

66 lf tared weighing pans (metal or glass) are to be used switch weight application to 20 g.

67 lf tared weighing boats or weighing pans are used continuously remove the two tare weights and adjust zero point.

68

30

When installing the tare ring, which is adjusted to the same weight of weighing pans and boats, remove tare weights according to item 68.

69 Specific gravity accessories

70 Weighing below the balance

71

31

Weighing below the balance Remove plugs out of glass plate.

72 Insert pan bow from below.

73

32

Connect pan bow to carrying rod.

74 Place carrying rod on the pan.

75

33

Correction of the weighing results The built-in weights are manufactures out of non-magnetic stainless-steel (specific gravity 7.88 g/cm3) These weights are adjusted to match brass weights of a specific gravity of 8.4 g/cm3 for an average atmospheric pressure of 0.0012 g/cm3. No corrections are necessary for differential weighings of identical samples. In the case of absolute weighings, the result of the following formula must be added to the weight indication on the scale of the balance:

Gram ) p

L G

L - 5-10 1 ( n K

+

=

where:

n = Weight indication in Grams

L = Air density in Grams per g/cm3

G = The specific gravity of built-in weights in Grams per g/cm3

P = The specific gravity of the sample in Grams per g/cm3

34

Model 2402 2414 2432* 2442**

Weighing range 200 g 160 g 200 g 200 g

Taring range optical 1

Built-in weights 1 199 g 0.1 159.9 g 1 199 g 1 199 g

Optical range 1 g 100 mg 1 g 1 g

One scale division 10 mg 1 mg 10 mg 10 mg

Readability (micrometer) 0.1 mg 0.01 mg 0.1 mg 0.1 mg

Precision (standard deviation) 0.05 mg 0.01 mg 0.05 mg 0.05 mg

Model 2443** 2462*

** ***

2472* ** ***

2474* ** ***

Weighing range 100 g 200 g 200 g 160 g

Taring range optical 1 g 1 g 0,1 g

Built-in weights 1 99 g 1 199 g 1 199 g 0,1 159,9 g

Optical range 1 g 1 g 1 g 100 mg

One scale division 10 mg 10 mg 10 mg 1 mg

Readability (micrometer) 0.1 mg 0.1 mg 0,1 mg 0,01 mg

Precision (standard deviation) 0.05 mg 0.05 mg 0,05 mg 0,01 mg

Model

2482* ** ***

2492* ** *** ****

2480 carat-balance

Weighing range 200 g 200 g 200 k

Taring range optical 1 g 1 g

Built-in weights 1 199 g 1 199 g 10 190 k

Optical range 1 g 1 g 10 k

One scale division 10 mg 10 mg 0,1 k

Readability (micrometer) 0,1 mg 0,1 mg 0,001 k

Precision (standard deviation) 0,05 mg 0,05 mg 0,0003 k

*) Optical tare **) Preweighing ***) Auto-Arrest ****) Mechanical tare

Sartorius AG B 37070 Gttingen P Weender Landstrae 94108, 37075 Gttingen T (0551) 308-0, F (0551) 308-3289 Internet: http://www.sartorius.com Copyright by Sartorius AG, Gttingen, Deutschland. 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.

Digital Analytical BalancesContentsInstallationBalances without tare weight indicationBalances without "Auto arrest"CheckingWeighing, regularBalances without Sartorius pre-weighingWeighing to a pre-set valueBalances without tare weight indicationWeighing to a pre-set value using balances without taring deviceSpecial AccessoriesWeighing below the balanceCorrection of the weighing resultsTechnical Data