Operating instructions

METTLER TOLEDOLabPac-M

DIFF

WEIGHING

%

FORMULA

NET

TOTAL

STORE

TARE

STORE

WEIGHT

COMP

IN %RE-ZERO

ID NR DATE TIME

CODE

SAVE

CLEAR

RESET

PRINT

ENTER

END

RESULTS

TOTAL % TOTAL

TOTAL LAST

TARGET COMP

2

The METTLER TOLEDO LabPac-M

The METTLER TOLEDO LabPac-M has been developed especially for use in the chemistry lab.It comprises a terminal (input keypad) and a plug-in program cassette. Connected to METTLERTOLEDO balances employing M technology, the LabPac-M provides an extremely easy way ofperforming the three most commonly required tasks in the lab.

- Net total weighing: Weighing in of any number of components from zero with the possibilityof calling up the net total at any time. With target weight setting,weighing-in aid (DeltaTrac) is activated.

- % Formulation: With or without preset component weights as a percentage of theformula weight. With target weight setting, weighing-in aid (DeltaTrac)is activated.

- Differential weighing: Determination of weight change - due to a physical or chemical process- in weight units or percent.

When METTLER TOLEDO balances of the SM series are used, there is a possibility to workwith the SM terminal instead of the LabPac-M terminal. Further details are given in the Section “SMkeypad” on pages 18 and 19.

To connect the terminal and other units

Two connection sockets at the rear of the balance are provided for the following units:Socket “DATA I/ O”: Units with RS232C or CL interface, e.g. GA44 Printer (for GA44 in the

configuration register, section I-Face; select standard setting: S.Stb,b 2400 and interval 1 s)

Socket “GM”: LabPac-M terminal and GM units with adapter plug

The coding pins in the sockets prevent improper connection.

3

To insert the program cassette

Insertion of the program cassette is described in the Operating Instructions of the balance used.Notes: - Before changing the program cassette, disconnect power cord of the balance (with SM

balances, press key [OFF]).- Replace standard program cassette by LabPac-M cassette.- Please keep the standard cassette; it may be useful in subsequent use without the

LabPac-M.

Configuration register with LabPac-M

The LabPac-M can be adapted to units specific to the application. In the section -Unit- of theconfiguration register (see Operating Instructions of the balance, “Configuration”), the followingcan be selected whatever the standard software of the balance:

Language: -E -Yes- = English (standard setting)-F -Oui- = French-d -Ja- = German-E -Si- = Spanish-I -Si- = Italian

Date: EU date = day, month, year (standard setting)US date = month, day, year

Printout: Au-Prot = printout automatic, depending on application (standard setting)SEL.Prot = printout only with [PRINT] key

Notes: - If the configuration register cannot be selected, check whether the jumper of theprogram cassette is in position “unsecured” (cf. Operating Instructions of thebalance, “Configuration”).

- Reset does not reset language and date.

4

The METTLER DeltaTrac

With METTLER balances employing M technology, the DeltaTrac can be used as a weighing-in aid or as a dynamic graphic display. Depending onthe application, the DeltaTrac displays "target weight” when the weight on the balance corresponds to the preset (keyed in) weight value or the piecenumber. The display has two accuracy ranges for coarse and fine weighing.

Operation of the DeltaTrac is illustrated here with a weighing to target weight in the application net total.

Dynamic graphic display

A container is placed on the balance and tared with the control bar.

The display continues to function as though the LabPac-M were not connected. It does not switchon until entries are made via the keypad during an application.

The segments of the dynamic graphic display show the container weight; the digital readoutremains at zero (container tared).

Weighing-in aid

The keys [NET TOTAL] and [COMP ] are now pressed, the component weight inputted and theentry closed with [ENTER]. This alters the way in which the dynamic graphic display functions:

The radial bars indicating the container weight are blanked out. A horizontal bar appears at the“9 o’clock” position. This is the coarse display and the 9 o’clock position is the zero position (nomaterial has been weighed yet).

Think of the graphic display, which is like a clock face, as being divided into a lower and upper half.The lower half shows the coarse reading, the upper half is the fine readout.

If the bars are in the left-hand half, the weight is below the target value. However, if the bars arein the right-hand half, the weight is greater than the target value.

min

us z

one

fine display

plus

zon

e

coarse display

5

Weighing-in, coarse (material to be weighed added at a brisk rate)

The bar previously pointing in a horizontal direction now rotates downwards. With 1/3 of the weight,it shows “8 o’clock”, with 2/3 “7 o’clock”. The target weight is reached when the bar points verticallydownwards (“6 o’clock”).

If more material is added (i.e. overfilling) the bar moves from the 6 o’clock position towards3 o’clock (shown dashed in the illustration). The 3 o’clock position denotes 100% overfill. The barremains in this position even if more material is added.

Weighing-in, fine

When the coarse pointer is just before the 6 o’clock position, the fine pointer appears. It also beginsat the 9 o’clock position and moves towards the 12 o’clock position. Each step in the pointer’sprogress corresponds to 0.5% of the target weight. The target weight is reached at the 12 o’clockposition (accuracy ±0.25% of target weight). If still more material is added, i.e. overfilling, the finepointer moves on towards the 3 o’clock position: shown dashed in the illustration. The 3 o’clockposition signifies 7.5% overfilling. The fine pointer remains in this position even if filling continues.At the same time, the coarse pointer moves from 6 o’clock in the direction 3 o’clock.

Weight OK

When the exact target weight (±0.25%) is reached, the fine and coarse pointers form a vertical linebetween 12 and 6 o’clock. Tolerance markers are provided to the left and right of the 12 o’clockposition. They indicate a tolerance range of ±2.5% of the target weight. If an accuracy of ±0.25%is not sufficient, material can be introduced at a brisk rate with the weighing-in aid until the finepointer is positioned just before 12 o’clock; the digital readout then provides further guidance.The pointers jump back to 9 o’clock when the component weight is stored by pressing the [RE-ZERO] key or [ENTER] after a new entry with [COMP ].

fine display

coarse display

target weight

6

Functions of general system keys

If a printer is connected, the date, time, identification number and code, if inputted, are printed outat the top of the printout. On power failure, the printout inscription is cleared.

[ID NR] Begin entry of identification number with max. 7 digits and 6 decimal points (e.g. useror workstation).

[DATE] Begin date entry (always 6 digits). The calendar runs until a power failure occurs.Cleared by overwriting with “0”.

[TIME] Begin time entry (00...24 h; 6 digits, hours, minutes, seconds). The clock runs untila power failure occurs. Cleared by overwriting with “0”.

[CODE] Begin entry of the code number with max. 7 digits and 6 decimal points, e.g. to identifyeach weighing task of a series. Printed out immediately after entry and then clearedautomatically.

[RESET] Clears all entries except for date and time.[RESET] must always be pressed before a new weighing task.

[CLEAR] Clears the entry of the last numeric key pressed (numeric keypad), then the next tolast, etc. provided [ENTER] has not yet been pressed.

[PRINT] Manual print command to print out entries or results which are not printed outautomatically (by an application).

[ENTER] Concludes the numerical input on the numeric keypad.

[SAVE] Saves maximum 3 stored values in addition to the application and the weighingmodes (statistics only) to prevent loss on power failure.Use [SAVE] only if power failure likely. For details, see applications.

ID NR

CODE

DATE TIME

SAVE

RESET

CLEAR

PRINT

ENTER

7

To enter values

Three steps are needed to enter values with the numeric keypad ([0] ... [9], [.], [-]):

1. Select desired function The selected function determines what type of value follows, e.g. a code number or a componentweight. The balance is now in the value entry mode.The keys [ID NR] [DATE] [TIME] and [CODE] have two functions: When pressed once, theappropriate function is selected. As pressing the keys activates the numeric keypad, the keysbecome numeric keys of this keypad.

2. Input the value on the numeric keypad

3. Press [ENTER] key The value entry mode is terminated and the value assigned to the appropriate function.

Corrections Wrong entries which have already been closed with [ENTER] must be corrected by reinputtingthem.Entries not yet closed with [ENTER] can be cleared with [CLEAR].

Examples The keys mentioned should be pressed in the specified sequence:

To enter date e.g. 24.7.87 [DATE] [2] [4] [0] [7] [8] [7] [ENTER](for EU date)

To enter time e.g. 9.45.38 [TIME] [0] [9] [4] [5] [3] [8] [ENTER]

To enter a component e.g. 83.5 g [NET TOTAL] [COMP ] [8] [3] [.] [5] [ENTER]weight in grams

To enter a component e.g. 27.8% [% FORMULA] [COMP IN %] [2] [7] [.] [8] [ENTER]weight in %

8

Net total (information)

Typical tasks and possibilities- Weighing in each component from zero (when weight entered with weighing-in aid).- Net total (sum of component weights) can be called up at any time.- Addition of top-up component (e.g. liquid) from net total to weight of formulation (add-weighing).

Notes

- Minimum weight entry = 1 digit

- Procedure when working without input of component weight (Delta-Trac not activated):[RESET] - [NET TOTAL] - load weight - [RE-ZERO] - load next weight,etc.

- Switching off the DeltaTrac during a net total weighing with [COMP][0]. Input component weight to reactivate DeltaTrac.

- The component weight can be protected against loss on power failurewith [SAVE].

- A protected value can be cleared with [RESET] [SAVE].

Specific key functions

Activates the application net total and the 3 related keys.Cleared by [RESET] or selection of another application.

Begin entry of component weight. Switches weighing-inaid to coarse and fine readout. Target weight is displayedwhen preset weight reached.

Adds effective component weight to net total. Sets digitalreadout and weighing-in aid to zero (ready for next compo-nent).

Switches between current component weight and net totalso far. (If key [RE-ZERO] has already been pressed,current component weight is zero.) The weighing-in aidshows the total weight.

NET

TOTAL

COMP

RE-ZERO

TOTAL

LAST

9

Net total (example)

Task: 1st component 1000 g; 2nd component 125 g; fill with liquid to 2500 g (balance type PM4600 DeltaRange)

Procedure Press keys Display Printout

Place container on balance,select application net total [NET TOTAL] 409.86 g

Tare Balance control bar 0.00 g

Key in weight of 1st component(1000 g) [COMP ] [1] [0] [0] [0] [ENTER] 0.00 g

Weigh in 1st component(slightly too much in this case) 1003.60g

Store true weight of1st component [RE-ZERO] 0.00 g

Key in weight of 2nd component(125 g) [COMP ] [1] [2] [5] [ENTER] 0.00 g

Weigh in second component(slightly too little in this case) 122.96 g

Store true weight of2nd component [RE-ZERO] 0.00 g

Call up net total so far [TOTAL/ LAST] [PRINT] 1126.60g

Fill to 2500 g [PRINT] 2501.10g

--------------------

NET TOTAL

--------------------

15.12.87 09:42

1*Comp 1000.00 g

Weight 1003.6 g

2*Comp 125.00 g

Weight 122.96 g

Total 1126.6 g

--------------------

Total 2501.1 g

--------------------

10

% Formula (information)

Typical tasks and possibilities

- Setting target weight (= 100%) of formula in grams and of components in percent of target weight.- Mixing solutions, starting with the weight of the 1st component on the weighing pan (input of 1st component in %). The target weight (100%) is

calculated by the balance.- Weighing in each component from zero with weighing-in aid.- Net total (sum of components) can be called up any time in % and weight.

Specific key functions

Activates the % FORMULA application and the 3 related keys. Cleared by [RESET] or selection of another application.

Begin entering the formula target weight in weight units (e.g. gram). This target weight represents 100% in relation to the components.Without entry of the target weight, the weight on the balance pan can be entered with [COMP IN %]. The target weight is then calculated.

Begin entering the components in % of target weight. Weighing-in aid with coarse and fine pointers indicates “target weight” whenspecified percentage reached. After weighing in, [COMP IN %] must be pressed to add effective percentage to net total. The displayis then set to zero automatically.

To call up the net total reached so far: Press key once to give net total in % of target weight, press twice for net total in weight units(e.g. gram). Clears previously shown, current component percentage. Thus press this key only when weighing of a component iscomplete. Return to % display by inputting the next component percentage.

%

FORMULA

TARGET

COMP

IN %

TOTAL %

TOTAL

11

Notes

- The target value entry can be greater than the weighing range of the balance. “Err 2” flashes as a warning, but work can be continued.

- Minimum value entry = 0.01%%- values which, based on the target weight, are less than 1 digit (smallest display unit of the balance), are not supported by the DeltaTrac +/ display.

- Formula target weight and first value of the component entry can be protected against loss on power failure with [SAVE].

- Protected values can be cleared with [RESET] [SAVE].

Application examples for %- formula, see following two pages.

12

% Formula (example 1)

Task: Formula target weight 2500 g (= 100%); 1st component 20% (= 500 g); 2nd component 7.5 % (= 187.5 g); fill with 3rd component totarget weight (2500 g) (balance type PM4600 DeltaRange)

Procedure Press keys Display Printout

Place container on balance,select application % formula [% FORMULA] 409.86 g

Tare Balance control bar 0.00 g

Key in target weight (2500 g) [TARGET ] [2] [5] [0] [0] [ENTER] 0.00 g

Key in 1st component (20%) [COMP IN %] [2] [0] [ENTER] - 500.00 g

Weigh in 1st component(slightly too little here) - 2.16 g

Store 1st component [COMP IN %] 0.00 g

Key in 2nd component (7.5%) [COMP IN %] [7] [.] [5] [ENTER] - 187.50 g

Weigh in 2nd component(slightly too much in this case) 1.44 g

Store second component [COMP IN %] 0.00 g

Call up net total in % [TOTAL %/ TOTAL ] [PRINT] 27.47 %

Fill with 3rd componentto 100% (= 2500 g) [PRINT] 100.05 %

--------------------

% FORMULA

--------------------

15.12.87 10:44

Target: 2500.00 g

*******

1*Comp 20.00 %

Weight 19.91 %

Weight 497.84 g

2*Comp 7.50 %

Weight 7.56 %

Weight 188.94 g

Total 686.8 g

Total 27.47 %

--------------------

Total 2501.1 g

Total 100.05 %

--------------------

13

% Formula (example 2)

Task: Prepare solution with 3 components. 1st component 700 g = 18%; 2nd component 10%; fill to 100% with 3rd component.Target weight calculated automatically with aid of 1st component weight. (balance type PM4600 DeltaRange)

Procedure Press keys Display Printout

Place container on balance,select application % formula [% FORMULA] 181.95 g

Tare Balance control bar 0.00 g

Weigh in 1st component(target weight 700 g) 699.80 g

Key in 1st component (18%) [COMP IN %] [1] [8] [ENTER] 699.80 g

Store 1st component [COMP IN %] 0.00 g

Key in 2nd component (10%) [COMP IN %] [1] [0] [ENTER] - 388.76 g

Weigh in 2nd component 0.11 g

Store 2nd component [COMP IN %] 0.00 g

Call up net total in % [TOTAL %/ TOTAL ] [PRINT] 28.00 %

Fill with 3rd componentto 100% [PRINT] 100.03 %

--------------------

% FORMULA

--------------------

15.12.87 11:03

1*Comp 18.00 %

Weight 699.8 g

2*Comp 10.00 %

Weight 10.00 %

Weight 388.87 g

Total 1088.6 g

Total 28.00 %

--------------------

Total 3888.7 g

Total 100.03 %

--------------------

14

Differential weighing (information)

Typical tasks and possibilities

- Weighed in samples are reweighed after treatment. Weights can be read in % or g.- Balance can be used for other weighings while samples undergo treatment, e.g. net total or % formula.- Storage of up to 20 tare weights and initial weighings possible. The results can be displayed in 4 different ways.

Specific key functions

Activates the differential weighing application and the 3 related keys. Cleared by [RESET] or selection of another application. Key mustalso be pressed again before the actual differential weighing.

Stores the container weight. Sets digital readout to zero, but not the weighing-in aid. Occupied tare memory shown by LED.

Stores the sample weight weighed. Occupied weight memory is shown by LED. The container weight is subtracted automatically.

Ends the weighing process (single weighing or a series of weighings). Only the LED [END � RESULTS] remains on. The key mustbe pressed to store the weighing and to start the differential weighing. After pressing the key [END � RESULTS], work can also becarried out in another application.

DIFF

WEIGHING

STORE

TARE

STORE

WEIGHT

END

RESULTS

15

Notes

- Calculation method for weight difference or differential weighing

After loading the sample for differential weighing and pressing the key [END � RESULTS], the result is displayed in the calculation mode lastused (CLEAR 1, 2 or 3) and recorded. As long as the sample remains on the balance, it is possible to switch to a different calculation method andprint out the corresponding value with [PRINT].

The following calculation methods are possible:

[CLEAR] weight difference in % of initial weighing (default, if nothing else has been selected)[1] weight difference in weight units[2] differential weighing in weight units[3] differential weighing in % of initial weighing

- The following two types of weighings are possible:

a) Store all tare weights (1...20) in succession, then the weights (1...20) in the same order � example 1b) First the tare and then the initial weight are stored, sample by sample (1...20) � example 2

Between the individual weighings (container or sample) of a series, the balance can be tared with the control bar if necessary.Stored values are indicated with LEDs.

- Repetition of the differential weighing:

As long as [END � RESULTS] [RESET] is not pressed during the differential weighing, the values remain stored. The differential weighing canthus be performed again.

- Clearing of an unusable weighing series:

Stored weight values of an unusable sample series which has been closed with [END � RESULTS] can be cleared with [DIFF. WEIGHING][END � RESULTS ] [RESET].

Application examples for differential weighing, see following two pages.

16

Differential weighing (example 1)

Task: Drying process with 2 samples. 1st sample ≈ 500 g, 2nd sample ≈ 800 g. Determine residual weight in % of initial weight (1st and 2nd sample),as well as weight difference in % of initial weight (2nd sample) (balance type PM4600 DeltaRange)

Procedure Press key Display Printout

Select diff. weighing application [DIFF. WEIGHING] 0.00 g

Place 1st container on balance, 151.75 gthen store tare weight [STORE TARE] - - - 1 - t -

Weigh in 1st sample, store, 501.50 gthen remove [STORE WEIGHT] - - - 1 - - -

Place 2nd container on balance, 206.53 gthen store tare weight [STORE TARE] - - - 2 - t -

Weigh in 2nd sample, store, 801.60 gthen remove [STORE WEIGHT] - - - 2 - - -

End weighing, performdrying procedures [END � RESULTS] 0.00 g

Start diff. weighing [DIFF. WEIGHING] 0.00 g

Place 1st dry sample on balance, - - - 1 - - -then remove sample [END � RESULTS] A69.60 %

- - - 2 - - -Place 2nd dry sample on balance [END � RESULTS] A43.14 %

Display and printout of weightdifference in % of initial weighing [CLEAR] [PRINT] - 56.86 %

--------------------

DIFF WEIGHING

SAMPLE PREP

--------------------

1 StoT 151.75 g

1 StoW 501.5 g

2 StoT 206.53 g

2 StoW 801.6 g

--------------------

--------------------

DIFF WEIGHING

RESULTS

--------------------

1 Abs 69.60 %

2 Abs 43.14 %

2 Dif -56.86 %

17

Differential weighing (example 2)

Task: Drying process with 2 samples. 1st sample ≈ 250 g, 2nd sample ≈ 150 g. Determine weight difference in % of initial weighing (1st and 2ndsamples) (balance type PM4600 DeltaRange)

Procedure Press key Display Printout

Select diff. weighing application(with difference display in %) [DIFF. WEIGHING] 0.00 g

Place 1st container on balance, 121.39 gthen store tare weight [STORE TARE] - - - 1 - t -

Place 2nd container on balance, 142.96 gthen store tare weight [STORE TARE] - - - 2 - t -

Weigh in 1st sample, store, 371.35 gthen remove [STORE WEIGHT] - - - 1 - - -

Weigh in 2nd sample, store, 294.70 gthen remove [STORE WEIGHT] - - - 2 - - -

End weighing, perform dryingprocedures [END � RESULTS] 0.00 g

Start diff. weighing [DIFF. WEIGHING] 0.00 g

Place 1st dry sample on balance, - - - 1 - - -then remove sample [END � RESULTS] - 47.65 %

- - - 2 - - -Place 2nd dry sample on balance [END � RESULTS] - 44.45 %

Note: After storage of the second tare weight, the differential weighing application can be interrupted with [END � RESULTS]. All values are stored.Work can now be started with another application. Return to unfinished differential weighing application with [DIFF. WEIGHING]. Theweighing of the samples can now be continued.

--------------------

DIFF WEIGHING

SAMPLE PREP

--------------------

15.12.87 08:16

1 StoT 121.39 g

2 StoT 142.96 g

1 StoW 249.96 g

2 StoW 151.74 g

--------------------

--------------------

DIFF WEIGHING

RESULTS

--------------------

15.12.87 08:19

1 Dif -47.65 %

2 Dif -44.45 %

--------------------

18

Operation of METTLER TOLEDO SM balances with the SM terminal

METTLER TOLEDO balances of the SM type can be operated with the SM terminal in the net totalapplication. Inputs can be made only via the LabPac-M terminal, however. After entry of thecomponent weight, the LabPac-M terminal can thus be removed until a change in the setting isdesired.

Notes

- Values which are not saved with [SAVE] are lost when the balance is switched off or on powerfailure.

- Saved values are cleared with the keys [RESET] [SAVE] of the LabPac-M terminal.

- In the % formula and differential weighing applications, the keys on the SM terminal have nofunction.

19

SM function keys in the net total application

Switching between current component weight and net total so far.Corresponds to the key [TOTAL/ LAST] of the LabPac-M keypad.

Corresponds to the [PRINT] key of the LabPac-M keypad.

Corresponds to the [RE-ZERO] key of the LabPac-M keypad.

20

Error messages

Err 2 Input value too high - Component weight is greater than balance capacity.

Err 3 Input value too small - Percentage input too small (display Err 2 or Err 3), i.e. 100% would be greater than weighingrange.After a timeout, the balance returns to the weighing mode.

Err 5 Date or time not complete Format for both entries: XX.XX.XX (6 digit)or implausible EU date: DD.MM.YY

US date: MM.DD.YY

Err 8 Sample number too large Sample number entry greater than 255.

All these error messages are displayed for approx. 5 seconds. The balance then displays the weight again. The cause of the error display is ignored.

Other error messages do not originate with the LabPac-M and are explained in the Operating Instructions of the balance in question.

21

What’s wrong if ...?

. . . - - - - - - is displayed? An entry is not yet possible since the system is still occupied with a printing task or is waiting fora stable weight value.Wait, then press key again.

. . . the display does not react to System is in enter mode. Close with [ENTER] is expected or clearance with [CLEAR]weight changes on the pan?

. . . the GA44 Printer prints only Wrong baud rate (transmission speed) setting (see Operating Instructions of the balance)?

. . . the GA44 Printer does not print - The printing interval is set wrongly (correct setting is 1 second, see Operating Instructionsevery line in the record? of the balance).

- The printing speed is too low. The time for 20 cm paper feed should be 23...27 seconds (seeGA44 Operating Instructions)

- Printout “Sel.Prot” in the configuration register section -Unit- is selected. Select “Au-Prot”.

. . . the printer prints continuously Set configuration of the interface in accordance with the balance Operating Instructionsor after every deflection of to S.Stb (send stable values).weighing pan?

. . . no commands can be entered via Entries not saved with [SAVE] are cleared on switching off the SM balance or on powerterminal of the SM balance? failure. The entries must be reinputted via the LabPac-M keypad and saved.

22

Overview METTLER TOLEDO Pacs

CalcPac-MAllows further processing of weight values by calculation operations

CountPac-MFor demanding piece counting (with fixed and variable reference, tare preset, portion counting,totalization, etc.)

DataPac-MKeypad which allows different inputs to the computer via a bidirectional data interface

GoldPac-MApplications for jewelry (three units that can be called up, automatic reconciliation of weight valueswith inputted prices)

LabPac-MApplications for the lab (differential weighing, % formula, net total)

PharmaPac-MApplications for pharmaceutical products (piece counting, statistics, net total)

ProPac-MApplications for the production (piece counting, statistics, ±control)

StatPac-MFor the statistical filling process control according to different tolerance systems and pharmacopy

XPac-MAllows realization of customer-specific applications

23

LEERSEITE

24

To give your METTLER TOLEDO product an assured future:METTLER T0LEDO Service preserves the quality, measurementaccuracy and value of METTLER TOLEDO products for years to come.Please send for full details of our attractive service conditions.Thanks in advance

Subject to technical changes and to the availabilityof the accessories supplied with the instruments.

© Mettler-Toledo GmbH 1999 702158 Printed in Switzerland 9911/2.12

Mettler-Toledo GmbH, Laboratory & Weighing Technologies, CH-8606 Greifensee, SwitzerlandPhone +41-1-944 22 11, Fax +41-1-944 30 60, Internet: http://www.mt.com

P702158