Mettler Toledo AT Balances, AT20, AT201, AT261, AT460 Operating Instructions Manual

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To protect your METTLER TOLEDO product‘s future: METTLER TOLEDO Service assures the quality, measuring accuracy and preservation of value of all METTLER TOLEDO products for years to come. Please send for full details about our attractive terms of service. Thank you.

*P11780209*

Subject to technical changes and to the availability

of the accessories supplied with the instruments.

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

Operating instructions

METTLER TOLEDO AT balances

Operating instructions METTLER TOLEDO AT balances

Thank you for purchasing a METTLER TOLEDO AT analytical balance. The AT balances combine a wide range of weighing and setting options with an exceptional ease of operation.

Please read these operating instructions through carefully so that you can utilize all possibilities offered by your AT balance to the full. These operating instructions also offer valuable support in the form of a glossary and an index.

The present operating instructions apply to all METTLER TOLEDO balances of the AT series. As the various models have different performance characteristics, however, special mention is made in the text where this is important for the operation.

Please read through the enclosed booklet “Weighing the right way”. It is intended as a supplement to these operating instructions and contains additional important tips and informations.

If you fold out this page, you will have an overview of your AT balance that shows you all features at a glance.

Safety has priority

– It is essential you consult the instructions in section 1.2 regarding putting your new balance into

operation. – The AT balances may be operated when connected to receptacle outlets with a ground connection. – The AT balances must not be operated in hazardous surroundings. – Never open the balance, it contains no parts which can be serviced, repaired or changed by the user.

In the unlikely event you experience problems with your balance, please contact the responsible

service facility.

Page 3

1 Key «Re-Zero», «Set», «On/Off» 2 Key «0.1/0.01 mg» (with dual-range balances only),

«Cancel»

3 Key «Menu», «Configuration» 4 Key «Select 1» 5 Key «Select 2» 6 Key «Print» 7 Key 8 Glass draft shield

9 Coupling element 10 Coupling element 11 Coupling element 12 Coupling element 13 Door handle 14 Door drive handle 15 Weighing pan 16 Draft cover 17 Level 18 Connection for foot or hand switch and electrical

contacts

19 Connection for data interface 20 Connection to overhead display 21 Plug-in slot for program cassette 22 Program cassette, protection of the configuration

parameters

23 Connection for AC adapter 24 Screw feet 25 Digital display (VFD or LCD) 26 Status indicators 27 Weight units 28 DeltaTrac®

Operating instructions METTLER TOLEDO AT balances

““

“

““

⇔⇔

Page

1 The AT smooths the way .............................................................. 1

1.1 The new weighing feeling................................................................ 1

1.2 Preparing your AT ........................................................................... 2

1.3 Weighing made simple .................................................................... 5

2 Your AT - a balance with extreme ease of operation ................. 8

2.1 A glass draft shield with unlimited possibilities................................ 8

2.2 The Mettler DeltaTrac - an informative display ............................. 11

2.3 Is your AT a Mettler DeltaRange balance? ................................... 11

2.4 How you can weigh in the coarse and fine range ......................... 12

3 Individual adaptation of your AT ............................................... 14

3.1 What is the menu? ........................................................................ 14

3.2 How to adapt your AT to different types of weighing..................... 17

3.3 How to adapt your AT to the local conditions ................................ 19

3.4 How to switch off the fully automatic door function ....................... 20

4 Additional possibilities in the configuration register .............. 22

4.1 What is the configuration register?................................................ 22

4.2 How is the configuration register used? ........................................ 23

4.3 In the first sector you return to the factory setting ......................... 26

4.4 The second sector offers you numerous adaptation

possibilities .................................................................................... 27

4.5 In the third sector you select the weight units

and additional settings .................................................................. 32

4.6 In the fourth sector the AT reveals itself as a balance

ready to communicate ................................................................... 35

4.7 Print out the current configuration ................................................. 38

4.8 How to protect your settings against inadvertent

changes......................................................................................... 39

5 Special applications and functions of your

Page

AT balance ................................................................................... 40

5.1 Your AT can work with two weight units........................................ 40

5.2 Your AT also weighs in percent and displays plus/minus

deviations ...................................................................................... 41

5.3 Should your AT count pieces? ...................................................... 43

5.4 How to trigger the adjustment manually ........................................ 46

5.5 How to check whether the balance is still

adjusted correctly .......................................................................... 49

5.6 How to print out the weighing result .............................................. 51

5.7 Your AT can also be remote controlled ......................................... 52

6 Important information regarding your AT................................. 53

6.1 The AC adapter offers you various installation

options........................................................................................... 53

6.2 If you change the location of your AT............................................ 55

6.3 A well maintained balance is a joy forever .................................... 56

6.4 What your AT brings with it ........................................................... 57

6.5 Additional information and accessories for your

AT balance .................................................................................... 57

7 Any questions? ........................................................................... 58

7.1 What happens if the weight display is unstable? .......................... 58

7.2 How can the weighing speed be increased?................................. 61

7.3 What happens if...? ....................................................................... 62

7.4 What does this error message mean? .......................................... 66

7.5 What does this term mean? .......................................................... 67

7.6 How are weight units converted? .................................................. 78

7.7 Where will I find details of...? ........................................................ 80

Technical specifications ................................................................ 84

Operating instructions METTLER TOLEDO AT balances

Printed on 100 % chlorine-free Paper, for the sake of our environment.

Page 4

Operating instructions METTLER TOLEDO AT balances

1 The AT smooths the way

1.1 The new weighing feeling

Your AT balance offers a wide range of functions, yet is simple to operate.

For example, there is no need whatever to concern yourself with the adjustment - your AT performs the adjustment fully automatically. Your AT is equipped with an adjustable glass draft shield with a fully automatic door function. Just two examples to give you a preview of the full range of equipment of your new balance.

Your AT balance is distinguished primarily, however, by its user friendliness. You set the balance up, connect it to the power supply and after a few minutes warm-up time you can immediately start weighing. You thus obtain your first weighing result in the shortest time possible.

The AT offers you the operating convenience and the complete range of options you expect from a top-quality analytical balance. There is, however, no need for you to grapple at the moment with functions you will not need until later.

In this first section you will find out how simply you can start up your AT and perform normal weighings.

Page 5

1.2 Preparing your AT

If you fold out the front fold-out, you have in front of you an immediate overview of all general illustrations at a glance.

You need undertake the following operations only on first-time installation and each time you change the balance location.

Select a suitable location

Your AT expresses its thanks for an optimum location by providing you with excellent weighing results:

- Firm, vibration-free location, as level as possible

- No direct sunlight

- No extreme temperature fluctuations

- No excessive drafts (e.g. through powerful air aWnditioning)

Additional tips and information regarding an optimum location can be found in the METTLER TOLEDO brochure “Weighing the right way”, which is enclosed with your balance.

Operating instructions METTLER TOLEDO AT balances

Page 6

Operating instructions METTLER TOLEDO AT balances

How you can transport the balance

When you position your AT balance at its location, please note the following:

To transport the balance, hold it at the front under the display and at the rear beneath the balance housing. Never lift your AT using the draft shield or the «Re-Zero» key!

Mount the draft cover and level the balance

- Place the draft cover 16 supplied separately in position. When positioning the draft cover, ensure that it is not touched by the weighing pan, which must move freely in its recess. If necessary, turn the weighing pan to the correct position. The draft cover is useful primarily for balances with the semimicro range (readability 0.01 mg). In many cases it need not be installed in weighings in the analytical range (readability 0.1 mg).

As an option, semimicro balances can be equipped with an additional inner draft shield whose installation is described in the enclosed mounting instructions.

- Turn the two screw feet 24 at the rear of the balance housing until

the air bubble is in the middle of

level 17.

Page 7

Prepare the glass draft shield

The draft shield of your AT balance comprises several parts which can be combined in a number of ways using the coupling elements. To preclude transport damage, these coupling elements are not locked in position when shipped. Connect the individual parts of the draft shield as follows:

- Pull all doors of the draft shield and the opposing door holder 14 forwards as far as possible.

- Push the two upper coupling elements 9 and 10 upward and the two lower coupling elements 11 and 12 downward until they lock.

When in this position, the whole draft shield opens. Additional combination possibilities of the individual doors are described in Section 2.1.

STANDBY

Connect your AT to the power supply

- Connect the AC adapter supplied to connection socket 23 at the rear of your AT balance and then to the power supply.

- The AC adapter can either be placed on the bench, attached to the balance or, to save space, be mounted on the wall. The AC adapter holder and the installation set with dowels and screws are used for this. Appropriate details are given in Section 6.1.

After connection, your AT balance is on standby and ready for weighing after a brief warm-up time of about 5 minutes. (See also Technical specifications page 84).

Operating instructions METTLER TOLEDO AT balances

Page 8

AT201

Max 205 g d = 0.1 mg

Operating instructions METTLER TOLEDO AT balances

pro FACT

METTLER TOLEDO

1.3 Weighing made simple

- By pressing the «On/Off» key you switch your AT from standby to the

pro FACT

Max 205 g d = 0.1 mg

AT201

Cancel

0.1/0.001 mg

Configuration

⇔

Set Re-Zero On/Off

METTLER TOLEDO

METTLER

Set your balance to zero (taring):

Select 2Select 1

⇔

- If you wish to tare a container, place it on the balance.

weighing mode. The balance now performs a brief self-test and all display segments light up briefly.

- Press the «Re-Zero» key. The fully automatic door function closes the draft shield.

- If the draft shield is open, you can close it by pressing one of the two

⇔

keys .

Your AT balance is fitted with a fully automatic door function, which ensures that the draft shield is always open or closed at the right time. Section 3.4 describes how you can switch off this automatic mechanism. On completion of the self-test, this function opens the draft shield completely automatically.

- - - - - -

Zeroing of the display (taring) is automatic. While the zeroing is in progress and the horizontal segments appear in the display, you can abort the process by briefly pressing the «Re-Zero» key again.

Page 9

0.0000

METTLER TOLEDO

5.34678

Select 2

On/Off

As soon as the warning beep sounds, zeroing of the balance is complete and the fully automatic door function opens the draft shield.

5.34678

- Read off the weighing result. The result remains “frozen” on the display for 5 seconds. This can be recognized by the flashing circle above the weighing unit. If the balance is attached to a printer, the weighing result is automatically

- Load the weighing sample and press the «Print» key. The fully automatic door function closes the

⇔

draft shield.

printed out.

With this automatic door function, your work steps in weighing are reduced from 9 to 5! (You

don't have to open and close the draft shield twice.)

It is possible that the warning beep sounds during a weighing and the adjacent symbol appears in the display. Your AT balance uses this to show that it would like to adjust itself. But there is

- The triangle symbol (print symbol) and the circle symbol of the stability detection (ASD) appear in the display.

AUTOCALIN

0.3675

no need for you to interrupt your work

- When the symbol of the stability detector (ASD) fades, the warning beep sounds; the triangle symbol also fades and the draft shield opens automatically. Note: You can also open and close the draft shield with one of the keys or by hand.

⇔

as the balance waits until you have not carried out any weighings for a period of about 5 minutes and then performs the fully automatic self-adjustment (proFACT). The symbol remains lit up until the balance has adjusted itself or until you trigger the adjustment by a

Operating instructions METTLER TOLEDO AT balances

Page 10

Operating instructions METTLER TOLEDO AT balances

STANDBY

keystroke. Section 5.4 shows you how to trigger the adjustment yourself.

- For switching off the balance, lift up the «On/Off» key briefly from below. This closes the draft shield automatically if the fully automatic door function is switched on. Otherwise, close the draft shield manually to prevent the ingress of dust and dirt.

After being switched off, the balance is on standby. When it is switched on again, it needs no warm-up time and is in immediate operational readiness.

Some additional tips:

- If you have made a mistake during weighing, there is no need to worry: Simply switch your AT off and then immediately on again. You will later learn of other possibilities to bring your AT to weighing readiness again.

- You can also effect the zeroing (taring) of the balance using the foot or hand switch (available as an accessory) attached to the balance via connection 18. Operation with the foot switch leaves you both hands free for loading your AT.

Page 11

- If you ever have to disconnect your AT from the power supply, first switch it off by lifting up the «On/ Off» key. After the balance has been reconnected, it is in the standby mode and “ appears in the display.

After an unexpected power outage, however, or if you have not switched off your AT before disconnecting it from the power supply, when power is restored again “–

OFF

–” appears in the display. When the «On/Off» key is now pressed, in this case an extended, internal self-test is first performed. Here the model designation and the software version are briefly displayed, and all display segments light up for a short space of time.

STANDBY

”

2 Your AT - a balance with extreme

ease of operation

2.1 A glass draft shield with unlimited possibilities

With the glass draft shield you can adapt your AT balance to the local conditions (principally drafts), to your individual style of weighing, to the size of the tare containers, and to the type of weighing and loading.

The fixed bars of a traditional draft shield prevent access to the weighing chamber.

Operating instructions METTLER TOLEDO AT balances

Page 12

Operating instructions METTLER TOLEDO AT balances

The draft shield of the AT balance has no fixed bars and the weighing chamber is freely accessible. Your AT is thus also especially well suited to automatic loading.

The left, right and upper doors of the draft shield can be combined in any way and hence matched to your weighing needs by means of the coupling elements 9 to 12. Try out various combinations by shifting the coupling elements upward and downward. For the manual door operation the coupling elements 11 and 12 must always be disengaged (top position)!

When small weighing samples have to be loaded, we advise you to open only one of the two side doors. Your balance then operates quicker since the disturbing air currents are less than when more doors of the draft shield are open.

You can operate the draft shield manually in the traditional manner.

Page 13

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

Pro FACT

METTLER TOLEDO

Select 2

On/Off

⇔

Max 205 g d = 0.01 mg

⇔

Set

The semiautomatic operation can be effected either with the left or the right

⇔

key. In this case, the draft shield is

⇔

opened and closed by the motor.

A further tip: You will obtain the most accurate results in the quickest possible manner if you close the draft shield completely during weighing! If this is

not possible, for instance with bulky In certain applications, such as zeroing (taring) of the balance, the draft shield opens and closes fully automatically as you already know from your first weighing. Manual or semiautomatic

weighing samples, you should combine

the doors of the draft shield such that

the greatest possible part of the draft

shield remains closed during the

weighing. operation is also possible when the fully automatic door function is operative. The fully automatic door function primarily facilitates work with the single or twin foot switch. Section 3.4 shows you how to switch off the fully

So that excellent weighing results can

also be achieved fast under difficult

weighing conditions, you can also use

an inner draft shield.

(Order number 210270) automatic door function.

For loading the balance, open only

as many doors as necessary. With

relatively small weighing samples or

rather small tare containers, it is

normally sufficient to open a single

door. This lessens the influence of

drafts and speeds up the weighing

process.

Operating instructions METTLER TOLEDO AT balances

Page 14

Operating instructions METTLER TOLEDO AT balances

24.083

98.215

2.2 The DeltaTrac® - an

informative display

The DeltaTrac® 28 is a supplement to the digital display 25. It provides you with a pictorial representation of the

weighing range in use and that still remaining. The dynamics of a

weighing process can be followed on the DeltaTrac® extremely well. Simply observe the DeltaTrac® during a weighing and you will immediately understand its function.

The DeltaTrac® gives you a new feel for weighing, even with special applications, for example in repeated weighing in to a specified target value and in percent weighings. You will find further details in Section 5.2.

2.3 Is your AT a DeltaRange® balance?

The AT261 and AT460 models are DeltaRange® balances. They have a ten times more accurate, movable fine range, which shows an additional decimal place. Thus, for example, the AT261 has a resolution of 0.1 mg over the entire weighing range and a movable fine range with a resolution of

0.01 mg.

This fine range can be called up at any

point in the whole weighing range as often as liked.

The movable fine range covers 62 g for both models. Each time you set the balance to zero (tare) with the «ReZero» key, the fine range is switched in. If the span of the fine range is exceeded, the balance automatically switches into the coarse range. The fine range can be called up again by rezeroing the balance once more using the «Re-Zero» key.

Page 15

Note:

This ten times more accurate movable fine range also remains active in differential weighing.

2.4 How you can weigh in the coarse and fine range

Semimicro and DeltaRange® balances of the AT series are equipped with a switch key which you can use to switch from the coarse range to a ten times more accurate fine range.

The AT thus allows you to work in the range best suited to your needs.

If, for example, instead of a high resolution you need a stable weighing result as rapidly as possible, you switch from the fine range to the course range using the switch key. This makes your AT very fast and the weighing results are extremely stable.

You can thus also disable the DeltaRange® if you do not need it.

Operating instructions METTLER TOLEDO AT balances

Page 16

Operating instructions METTLER TOLEDO AT balances

12.6439

You have the following selectable ranges available:

Balance Coarse Fine Key

range range

AT20 0.01 mg 2 µg 10 / 2 µg AT201 0.1 mg 0.01 mg 0.1 / 0.01 mg

AT261 0.1 mg 0.01 mg 0.1 / 0.01 mg AT460 1 mg 0.1 mg 1 / 0.1mg

With the «0.1/0.01 mg» key (e.g. with AT201/AT261 DeltaRange®) you can switch between the coarse and the fine range:

- The balance is measuring in the coarse range

Max 205 g d = 0.01 mg

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

12.64387

Pro FACT

- Press the «0.1/0.01 mg» key (e.g. with AT201/AT261 DeltaRange®)

and …

- …the balance operates in the ten times more accurate fine range.

- By pressing the «0.1/0.01 mg» key again, you can return to the coarse range.

Page 17

3 Your AT is an adaptable balance

For the optimization of your weighing results and adaptation to your weighing needs, the AT offers you additional setting options. You undertake these adaptations in the menu, which you will now be introduced to.

You can set additional parameters in the second menu tree of your AT, the configuration register (section 4).

3.1 What is the menu?

In the menu you match your balance to the local conditions and to the weighing tasks. The menu contains various adaptation possibilities, the menu options, which in turn offer different setting options.

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

Set

Max 205 g d = 0.01 mg

⇔

Overview of the menu functions:

- reference weight in %

- reference weight in pieces

- adjustment

- weighing process adapter

- vibration adapter

- fully automatic door function

You will find a detailed overview of the menu on pages 82 and 83.

In addition, you can also perform several operational steps in the menu for special applications (percent weighing and piece counting). Section 5 of these operating instructions provides you with more information.

Pro FACT

We encourage you to experiment with the menu to familiarize yourself with it.

You need have no worries here: By pressing the «Cancel» key you can return to the weighing mode at any time without changing the stored settings!

Operating instructions METTLER TOLEDO AT balances

Page 18

Operating instructions METTLER TOLEDO AT balances

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Max 205 g d = 0.01 mg

You perform your weighings in the weighing mode, the operational mode of your balance. Weighing mode and menu are separate. By pressing and holding the «Configuration» key you can call up the configuration register. You can also select the different menu

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

Set

Max 205 g d = 0.01 mg

⇔

Pro FACT

«Set» key

- Confirmation of your selection and return to the weighing mode. The selected settings are stored and remain so even after the balance has been switched off.

options and setting possibilities with keystrokes.

«Menu» key

Pro FACT

- Selection of the menu by briefly

AT201

0.1/0.01mg

Configuration

pressing the key in the weighing mode

Cancel

Select 1

Set

Max 205 g d = 0.01 mg

⇔

Pro FACT

«Cancel» key

- Exit the menu and return to the weighing mode without any chan- ges being made. If you have made a wrong selection, you can leave the menu at any time by pressing the «Cancel» key. You are then in

- Selection of the individual menu

options

the weighing mode again without any change in the settings.

Instead of pressing the «Cancel» key, you can naturally switch the scale off and then on again.

Pro FACT

«Select 1» key

- Selection of the setting in a menu option

Page 19

CAL Int

door Auto

By repeated pressing of the «Menu» key, all available menu options appear in the display in succession:

- proFACT fully automatic adjustment and linearization

- Adaptation to the type of weighing (weighing process adapter)

- Adaptation to the local conditions (vibration adapter)

- Automatic door function of the draft shield

A complete overview of the menu can be found on the pages 82 and 83.

Some additional tips:

- Not all menu options are constantly or exactly displayed in the form shown; some of them, e.g. the setting of reference weights (“Set 100%”) depend on additional settings in the configuration register, which we will introduce you to in Section 4 of these operating instructions.

- If you are in the menu and press no

key for about 1 minute, the AT returns automatically to the weighing mode. Any changes in

the settings made up to this point are ignored in this case.

Operating instructions METTLER TOLEDO AT balances

Page 20

Operating instructions METTLER TOLEDO AT balances

- In the following 3 sections you will get to know the three menu options (weighing process adapter, vibration adapter and automatic door function) in detail. The additional setting options for special applications (weighing in reference weights for percent weighings or piece counting and the adjustment) will be introduced in Section 5.

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

Set

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

Set

Max 205 g d = 0.01 mg

⇔

Max 205 g d = 0.01 mg

⇔

3.2 How to adapt your AT to different types of weighing

Your AT balance can be matched to different types of weighing (fine dispensing, absolute weighing, etc.) very simply. It is equipped for this purpose with the so-called weighing process

Pro FACT

adapter, which can be set in the menu.

- Select the menu by pressing the

«Menu» key briefly.

- Press the «Menu» key repeatedly

until the drop symbol of the weighing process adapter appears in the display.

- Select the appropriate setting with

the «Select 1» key:

Page 21

This is the universal setting suitable in principle for all types of weighing. This setting is preset in the factory.

The position absolute weighing is suitable for the rapid checking of a weight. During the weighing in, the last decimal place is suppressed.

If you wish to employ fine dispensing (weighing in) of a fine powder or small amounts of liquid, select the weighing in position. This provides a continuous display of all decimal places, and the weight increase can thus be followed easily.

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

Set

Max 205 g d = 0.01 mg

⇔

In this position the drop symbol is invisible, the weighing process adapter is switched off. This setting is suitable only for special appli- cations in which not only the final result but also the dynamics of the weighing process are of interest, for example the recording of weight changes due to evaporation against time.

Pro FACT

- When you have selected the appro-

priate setting, press the «Set» key. This makes the settings active immediately, and the balance returns to the weighing mode.

Operating instructions METTLER TOLEDO AT balances

Page 22

Operating instructions METTLER TOLEDO AT balances

3.3 How to adapt your AT to the local conditions

For all weighings, we advise you always to open the draft shield only as far as necessary. You thus achieve stable weighing results as quickly as possible.

If, despite a closed draft shield, no stable weighing results are found, the cause could lie with unfavorable local conditions such as vibrations. Very minor, hardly noticeable vibrations of the weighing table are usually involved.

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

Set

Max 205 g d = 0.01 mg

⇔

With the so-called vibration adapter your AT balance can be matched in the menu to the local conditions.

Pro FACT

- Select the menu.

- Press the «Menu» key repeatedly until the wave symbol of the vibration adapter appears in the display.

Pro FACT

- Select the appropriate setting with the «Select 1» key:

Page 23

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Max 205 g d = 0.01 mg

This setting is suitable for normal ambient conditions; the balance

operates at moderate speed in this case. This position is set in the factory.

Note:

A further reason for an unstable display of the weighing result could lie, for instance, with electrostatic charging of the weighing sample or the container. You will find additional information

regarding this in Section 7.1. This setting is suitable for work in unquiet surroundings. The balance operates more slowly, but is less sensitive to external disturbances.

3.4 How to switch off the fully automatic door function

This setting is suitable for very quiet and stable surroundings. The balan-

ce operates very rapidly, but is relatively sensitive to external disturbances.

Pro FACT

- When you have selected the appropriate setting, press the «Set» key. The chosen setting then immediately becomes active, and the balance returns to the weighing mode.

You are already familiar with the convenient automatic door function of your AT balance from your first weighing. When the automatic door operation is switched on, the draft shield closes automatically after the «Re-Zero» key (zeroing/taring) or the «Print» key (printout of the weighing result, see Section 5.6) has been pressed. As soon as the weight display is stable, the draft shield is reopened for the next weighing operation (e.g. weighing in, loading the balance). The draft shield is thus always in the correct position for the next weighing process. Routine

Operating instructions METTLER TOLEDO AT balances

Page 24

Operating instructions METTLER TOLEDO AT balances

work is particularly facilitated by this automatic operation. It is also useful in the percent weighing (Section 5.2) and piece counting (Section 5.3) applications. When the twin foot switch (see brochure is used, the automatic operation leaves both hands free for weighing in.

If you wish to operate the draft shield manually or semiautomatically via the two keys, however, you can switch

⇔

off the automatic door operation:

Pro

Max 205 g d = 0.01 mg

Cancel

Select 1

FACT

⇔

Set

AT201

0.1/0.01mg

Configuration

door Auto

Pro

Max 205 g d = 0.01 mg

Cancel

Select 1

FACT

⇔

Set

AT201

0.1/0.01mg

Configuration

- Select the menu.

- Press the «Menu» key repeatedly until the adjacent display appears.

- Using the «Select 1» key, you can now switch the automatic door operation off and on again:

Page 25

door Auto

door Std

Pro

Max 205 g d = 0.01 mg

Cancel

Select 1

FACT

⇔

Set

AT201

0.1/0.01mg

Configuration

Fully automatic door function switched on

Fully automatic door function switched off

- Activate the chosen setting by pressing the «Set» key and you will be returned once again to the weighing mode.

4 Additional possibilities with your AT

In addition to the menu, the AT offers you further, very specific adaptation possibilities. You perform these adaptations in the configuration register, which we will introduce you to in the following section.

4.1 What is the configuration register?

The configuration register is divided into four sectors in which you can vary

SEtt INGS

SCALE

the following settings:

- Operational setting

• Reset

- Basic settings

• ASD, automatic stability detector

• Readability

• Readability in the semimicro range

• Autozero

• proFACT, adjustment and linearization

Operating instructions METTLER TOLEDO AT balances

Page 26

Operating instructions METTLER TOLEDO AT balances

Unit

Int -FACE

- Weighing units weighing unit 1 weighing unit 2 status indicator beeper

- Interface data transmission mode data transmission rate parity transmission protocol end-of-line mode

You will find further details on the adjustment parameters on pages 82 and 83.

4.2 How is the configuration register used?

Hold the short-form operating instructions in your hand. You will then have the complete configuration register at a glance in front of you.

We would like to encourage you to experiment with the configuration

You need have no worries on this score: By pressing the «Cancel» key, you can return at any time to the weighing mode without any of the stored settings being altered!

Page 27

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

Max 205 g d = 0.01 mg

⇔

Set

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Pro FACT

Max 205 g d = 0.01 mg

METTLER TOLEDO

Select 2

On/Off

Pro FACT

By pressing and holding the

«Configuration» key, you call up the

configuration register.

⇔

You select the different

- sectors («Configuration» key)

- parameters («Select 1» key)

- settings («Select 2» key) by simply pressing the appropriate key. In contrast to the menu, you also need the «Select 2» key for operation of the configuration register.

«Configuration» key

Selection of the configuration

(about 5 seconds). You are then already in the first sector.

Selection of the individual sectors in the configuration register with a brief keystroke. After the last sector you are returned to the first.

Max 205 g d = 0.01 mg

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

METTLER TOLEDO

Max 205 g d = 0.01 mg

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Pro FACT

Select 2

On/Off

Pro FACT

«Select 1» key

Selection of the parameters in a sector. After the last parameter in this sector you are returned to the first.

«Select 2» key

Selection of the desired setting of a

⇔

parameter. After the last setting of a parameter, you are returned to the first.

«Set» key

Confirmation of your selection and return to the weighing mode. The selected settings are stored and remain so even after the balance has been switched off or disconnected from the power supply.

Operating instructions METTLER TOLEDO AT balances

Page 28

Operating instructions METTLER TOLEDO AT balances

Max 205 g d = 0.01 mg

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

2400 bd

Pro FACT

«Cancel» key

Exit the configuration register and return to the weighing mode with- out any changes being stored. If you have made a wrong selection, you can quit the configuration

A further tip:

If you are in the configuration register and you do not press a key for about 1 minute, your AT automatically returns to the weighing mode. In this case, any

alterations in the settings are ignored. register at any time by pressing the «Cancel» key. You are then again in the weighing mode without any

setting having been altered.

Instead of pressing the «Cancel» key, you can also switch the balance off, then immediately on again.

In the following sections you will learn

what parameters you can select in what

sectors, and what settings are avail-

able. You will find the first example in

the setting of the parameter “Auto-

matic stability detection” (ASD) in

Section 4.4. In the following sections,

you will also find recommendations for

the correct setting of your AT balance.

Your AT balance is naturally not supplied with an empty configuration register. We have already included

Further useful tips are contained in the

enclosed booklet “Weighing the right

way”.

standard settings for you. You can recognize these factory settings by the asterisk in the upper left corner of the display.

Page 29

4.3 In the first sector you return to the factory settings

As you have learned in the preceding section, the configuration register of your AT balance has been preset in the factory. Even if you have modified the settings, you can return to the factory setting at any time.

But here all specific settings, even those in the menu, will be replaced by the factory settings!

You undertake the return to the factory settings in the first sector (operational settings). This sector contains only a single parameter:

-ConF-

SEttINGS

rESEt

0.0000

- Select the configuration register by pressing and holding the «Configu- ration» key. As soon as the display shown opposite appears, release the key.

- You are now in the first sector (

Settings

) of the configuration

- Select the first (and only) parameter («Select 1» key).

- Activate the resetting by pressing the «Set» key, and the scale returns automatically to the weighing mode. You again work with the factory settings.

Operating instructions METTLER TOLEDO AT balances

Page 30

Operating instructions METTLER TOLEDO AT balances

SCALE

ASd

0.35

4.4 The second sector offers you numerous adaptation possibilities

- Select the configuration register by

pressing and holding the «Configuration» key. Then select the second sector (basic settings) by pressing the «Configuration» key briefly.

In this sector you can select the following parameters and their settings:

Automatic stability detection (ASD)

Your AT possesses an automatic stability detection. As long as the balance is unstable, the stability detection symbol remains lit up in the upper left corner of the display. The symbol fades and the weighing result is released only when the result is within

the limits selected by you for the stability.

You have a choice of eight settings. In the setting

ASd–1–

the display must be within a preset tolerance limit for one second for the result to be released as stable. In the setting

ASd–7–

the result must be within a preset tolerance limit for several seconds before being released.

- Select the first parameter, the

automatic stability detection (

ASD

with the «Select 1» key.

- Select the appropriate setting with

the «Select 2» key. The following illustration shows the relationship between the repeatability and the weighing speed.

Page 31

Stage Weighing Repeata-

speed bility

off

very fast good

1 2 3 * 4 5 6 7 fast very good

In the

oFF

position, the balance does not wait for attainment of stability; each result is considered stable. This setting is used in special applications in connection with the serial data interface (see also Section 4.6 “Data transmission mode”).

* = factory setting

Readability (selection of the readout increments)

In this parameter you define the readout increments (digits) for the last decimal place. Readout increments of 1, 2, 5 and 10 are available, and these are symbolized by the following setting options:

AT20 AT201 / AT261 AT460

DeltaRange® / DeltaRange® AT200 / AT400

0.01 mg* 0.1 mg* 1 mg*

0.02 mg 0.2 mg 2 mg

0.05 mg 0.5 mg 5 mg

0.1 mg 1 mg 10 mg

* = factory settings Select readout increments as large as

your application allows; the larger the readout increments, the faster the operation of your balance.

Readability (Selection of the readout increments) in the fine range

This parameter is available only with semimicro and DeltaRange® balances)!

Operating instructions METTLER TOLEDO AT balances

Page 32

Operating instructions METTLER TOLEDO AT balances

Here you define the readout increments (digits) for the last decimal place in weighings in the fine range. Readout increments of 1, 2, 5 and 10 are available, and symbolized by the following setting options:

AT20 AT201 / AT261 AT460

DeltaRange® DeltaRange®

2 µg* 0.01 mg* 0.1 mg* 5 µg 0.02 mg 0.2 mg 10 µg 0.05 mg 0.5 mg

0.1 mg 0.1 mg 1 mg

* = factory settings Select readout increments as large as

your application allows; the larger the readout increment, the faster the operation of the balance.

With the «0.1/0.01 mg» key you toggle between the coarse and fine range of DeltaRange® balances. Swit-ching is possible only below a limit which depends on the model (see also Section

2.4).

oFF

Autozero (AZ) In this parameter you switch the auto-

matic zeroing (autozero) on or off. When switched on, the zero is automatically corrected for drift or contamination of the weighing pan.

- Autozero on *

- Autozero off

* = factory setting For particular applications (e.g. evapo-

ration measurements), it can be an advantage to switch the autozero function off.

Page 33

CALIN

Auto on

Adjustment and linearization with proFACT

In this parameter you define the adjustment mode i.e., the way in which your balance should be adjusted and linearized. The following possibilities are available:

- The AT balance adjusts and

linearize itself fully automatically by loading two internal adjustment weights. The process is initiated as soon as a change in the operating conditions makes this necessary. One of the most important initiation criteria is a temperature fluctuation in the surroundings of ± 1.5 °C. You do not have to concern yourself with the adjustment of the balance. The adjustment and the simultaneous linearization provide you with the surety that the displayed value matches the mass of the loaded weight over the entire weighing range of your AT.

Display value

100%

50%

proFACT professional fully automatic adjustment and linearization technology

1. Adjustment

The two internal adjustment weights are loaded. The display is adjusts so that the loaded weight matches the display-ed value. (Correction of the slope of the straight line).

2. Linearity

The internal weight m1 is loaded alone and together with the weight m2. The linearity is adjusted using the different display values for m1 in both measurements. If the two displayed values,y

and y2, are equal, the linearity is adjusted. (Correction of the deviation from the shape of an ideal straight line).

100%

Loaded weight

Operating instructions METTLER TOLEDO AT balances

Page 34

Operating instructions METTLER TOLEDO AT balances

CALIN

Auto oFF

In this mode you can also initiate the fully automatic adjustment and linearization at any time with a keystroke. This is practical, for instance, when your AT reports during a weighing that it wishes to adjust itself. Section 5.4 shows you how to proceed in such a case.

- The fully automatic self-adjustment

with linearization adjustment (proFACT) described above is switched off. You can trigger the

adjustment with the internal adjustment weights at a keystroke. After initiation, the adjustment runs automatically, and at the same time the measuring range is linearized. Section 5.4 shows you how to proceed in this case.

USEr

CALIN

- You use your own, external adjustment weight for the adjustment. The procedure is described in Section 5.4 of these operating instructions. proFACT is not active in this setting.

* = factory setting

Page 35

Unit

Unit 1

4.5 In the third sector you select the weight units and additional settings

Select the third sector (weight units) in

dwt pennyweight ct carat, metric C.M. carat, metric (GB) mo momme

* = factory setting

the configuration register. In this sector you can select the follow-

ing parameters and their settings:

Weight unit 1

The following weight units are available:

Display Name

g* gram mg milligram oz ounce ozt Troy ounce tl tael (see note)

HONg

GN grain

The number of decimal places in each unit is dependent of the balance model.

By pressing the between weight unit 1 ( weight unit 2 (

““

“ key, you toggle

““

Unit 1

Unit 2

). Section 5.1

) and

provides you with further details regarding this switching. A conversion table for the weight units is given in Section 7.6.

Note for weight unit tael: You have the possibility to choose between three national tael units:

If you have selected the tael unit with the «Select 2» key, press the «Select 1» key until the adjacent display appears.

Operating instructions METTLER TOLEDO AT balances

Page 36

Operating instructions METTLER TOLEDO AT balances

S9P NAL

rOC

With the «Select 2» key you can now select the desired national tael unit:

Hong Kong (factory setting)

Singapore, Malaysia

Taiwan (Republic of China)

Confirm your selection by pressing the «Set» key.

You need perform the selection of the national tael unit you require only once. After this, whenever you configure tael as a weight unit, the national tael unit you have preselected will be used.

Unit 2 û

Weight unit 2

You have available the same weight units as with weight unit 1 and also the

application units piece and percent:

Display Name

g gram mg* milligram oz ounce ozt Troy ounce tl tael (see note Tael under

weight unit 1) GN grain dwt pennyweight ct carat, metric C.M. carat, metric (GB) mo momme PCS pieces Stk pieces (German) % percent

* = factory setting The number of decimal places in each

unit depends on the balance model.

Page 37

Auto

Unit 2

). You will find

““

“, you toggle

““

Unit 1

) and

By pressing the key between weight unit 1 ( weight unit 2 ( further details in Section 5.1. A conversion table for the weight units is given in Section 7.6.

The application units «piece» and «percent» are described in detail in Sections 5.2 and 5.3.

Graphic indicators

The graphic indicators 26, such as the symbols for the vibration adapter and the weighing process adapter, provide you with an overview of the selected settings. These graphic indicators can be switched on or off.

- A few minutes after the balance has been switched on, the symbols fade*.

bEEP

bEEP on

bEEP oFF

- The symbols are displayed permanently.

* = factory setting

Beeper setting

The audio acknowledgement beep supports the operation of the balance and the display audibly. You can switch it off or on.

- audio acknowledgement beep switched on *

- audio acknowledgement beep switched off

* = factory setting

Operating instructions METTLER TOLEDO AT balances

Page 38

Operating instructions METTLER TOLEDO AT balances

Int-FACE

4.6 In the fourth sector the AT reveals itself as a balance ready to communicate

- Select the fourth sector in the

configuration register (interface).

For the attachment of a non-METTLER TOLEDO printer or a PC you can select the parameters for the data transmission via the serial data interface and their settings in this sector. You will find more detailed information regarding use of the interface in the instructions “Bidirectional Interface of the METTLER TOLEDO AT balances”, which is available from METTLERTOLEDO.

S. Stb

S. ALL

S. Auto

S. Cont

Data transmission mode

The following setting options are available:

- Send stable: The first stable value is transferred after initiation of the print command after release by the automatic stability detection. *

- Send all: The current value is transmitted after initiation of the print command.

- Send automatically: The first stable value is transmitted automatically after every weight

increase of at least 0.01 g.

- Send continuously: All prepared values are transmitted continuous-

ly.

* = factory setting

Page 39

2400 bd

Important note:

If you have switched off the automatic stability detection in sector 2 (

ASD oFF

all weight values are regarded as being stable. After the «Print» key has been pressed in this case, the following values are transmitted:

In setting the setting

In setting

S.Stb

: The current value as in

S.ALL

S.Auto

: The first value after a

weight change of more than 0.01 g.

Data transmission rate (baud rate) The data transmission rate (baud rate)

determines the speed of the transmission via the serial interface. The unit is the baud (1 baud (bd) = 1 bit/second). The following transmission rates are available:

PAr

PAr -E-

PAr -O-

- 150 db

- 300 db

- 600 bd

- 1200 bd

- 2400 bd *

- 4800 bd

- 9600 bd * = factory setting

Parity

With the aid of the parity test, simple bit errors in the data transmission can be recognized by a parity check. The following setting options are available:

- Parity Even *

- Parity Odd

Operating instructions METTLER TOLEDO AT balances

Page 40

Operating instructions METTLER TOLEDO AT balances

PAr oFF

PAr SPc

HS PAUSE

HS CL

- Parity Off

- Parity Space

* = factory setting

Transmission protocol (HandShake) These settings allow matching of the

data transmission to various serial receivers. The following settings are available:

Pause of 1 second (for METTLERTOLEDO GA42 Printer) *

- METTLER TOLEDO transmission protocol. In this operating mode, the end-of-line mode is automatically set to “crLF” and can not be changed.

HS oFF

HS HArd

HS Soft

EOL

EOL crLF

EOL cr

- No handshake

- Hardware handshake (DTR/CTS)

- Software handshake (XON/XOFF) * = factory setting

End-of-line mode

Two setting options are available:

- Balance return and line feed at end of line*

- Balance return at end of line

* = factory setting

Page 41

Important note:

HS CL

is set in the transmission protocol, the end-of-line mode is set automatically to

EOL

crLF and can not

be changed.

4.7 Print out the current

configuration

You can print out the configuration currently stored on an attached printer. This record is useful if you work with different configurations. You then know at all times which values should be set for which application.

METTLER TOLEDO

Select 2

⇔

On/Off

Proceed as follows for the printout:

- Select the configuration register.

- Press the «Print» key, and the current configuration will be printed out.

A further tip: Always print out your specific configuration. You thus have a record of your settings and even if you return to the factory settings, you can restore your configuration at any time.

Operating instructions METTLER TOLEDO AT balances

Page 42

Operating instructions METTLER TOLEDO AT balances

4.8 How to protect your settings against inadvertent change

As you know, with one press of the «Set» key your individual settings in the configuration register are stored. These are available at any time (even if the balance has since been disconnected from the power supply). You are not, however, protected against inadvertent alterations, for instance by other balance users.

To safeguard the settings, proceed as follows:

- Disconnect the cable of the AC

adapter from the receptacle.

- Remove the cover of the plug-in slot

21 at the rear of your AT balance.

unprotected

protected

- Grasp the bracket of the program cassette 22 and withdraw this carefully from the plug-in slot 21.

- Remove the jumper with a thin pin or a needle from the contact pins.

- If you wish to protect your individual settings in the configuration register against inadvertent changes, place the jumper across both contact pins.

- Slide the program cassette 22 into the plug-in slot 21 up to the stop and replace the cover. Plug the cable of the AC adapter into the receptacle.

Page 43

If you have secured your settings, the configuration register is no longer accessible and no more alterations can be made.

- To remove the safeguard, proceed in the reverse sequence.

5 Special applications and functions of

your AT balance

Your AT balance is also prepared in the best possible way for special cases. Applications and functions built in as standard expand the possibilities of your AT balance and facilitate the operation. The following section familiarizes you with these applications and functions.

5.1 Your AT can work with two weight units

With your AT balance you can toggle between two preselected weight units at any time. Section 4.5 of these operating instructions shows you how to select and store these two weight units in the configuration register.

Operating instructions METTLER TOLEDO AT balances

Page 44

Operating instructions METTLER TOLEDO AT balances

68.4 µ

METTLER TOLEDO

Select 2

On/Off

0.3422

You have, for example, selected “mg” as weight unit 1 and “ct” as weight unit 2 in the configuration register. You can switch between these two units at a keystroke:

5.2 Your AT also weighs in percent and shows plus/ minus deviations

This built-in application allows you to weigh in to a preset value (100%) and

The balance is now operating with weight unit 1.

to determine deviations from this

target value.

So that this application appears in the menu, you must set the unit to percent (%) under the parameter “Weight unit 2” (

Unit 2

- Press key

⇔

- …the balance now works with

weight unit 2. By pressing the key again, you can return to weight unit 1.

““

“ briefly and…

““

“

““

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Max 205 g d = 0.01 mg

sector of the configuration register as described in Section 4.5.

Pro FACT

- Press the «Menu» key briefly and

The table in section 7.6 shows you the conversion factors between the various weight units.

SEt 100 %

) in the “Weight units” (

the AT requests you to load the

reference weight.

Note: This request appears only if

weight unit 2 is set to percent (%).

Unit

)

Page 45

- - - - - -

- Open the draft shield and load the reference weight.

- Press the «Set» key and the draft shield closes automatically if the automatic door function is switched on. If not, close the draft shield manually or by pressing one of the two keys and then press key

⇔

«Set».

As long as the horizontal dashes are displayed, your AT is weighing the reference weight.

-2.5% 100% +2.5%

- As soon as the horizontal dashes disappear, the reference weight has been read in and your AT is ready for weighing. If the automatic door function is switched on, the draft shield opens automatically after completion of the weighing process. If not, open it yourself. Remove the reference weight.

The DeltaTrac® now shows a plus and a minus marking that displays the tolerances of plus and minus 2.5%.

Now first weigh in coarsely:

- Place the empty container on the pan and set the balance to zero (taring).

Operating instructions METTLER TOLEDO AT balances

Page 46

Operating instructions METTLER TOLEDO AT balances

67.40 %

coarse indicator

fine indicator

98.70 %

100.00

- Add the weighing sample at a steady rate to the container until the coarse indicator on the DeltaTrac® is pointing vertically downward. This shows that the approximate target weight has now been reached.

Now perform the fine weighing:

- After the coarse weighing in, you now add the weighing sample carefully until the fine indicator on the DeltaTrac® is pointing vertically

upward.

- When the fine and the coarse pointers form a vertical line, the set weight is within ± 0.25% of the target.

If you possess a dual-range balance (semimicro balance), you also have a fine range available in the weight unit %, in which additional decimal places are displayed.

With the key

““

“ you can display either

““

the percentage or the weight (see also Section 5.1).

5.3 Should your AT count pieces?

First your AT needs to know that you wish to perform piece counting. You make this setting in the third sector of the configuration register ( you set weight unit 2 ( This setting is described in Section 4.5.

Unit

Unit 2

), where

) to

PCS

Page 47

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Max 205 g d = 0.01 mg

Pro FACT

- Open the draft shield manually or by pressing one of the two keys .

⇔

- If you wish to count into a container, load the empty container.

pro FACT

Max 205 g d = 0.1 mg

AT201

Cancel

0.1/0.001 mg

Configuration

⇔

Set Re-Zero On/Off

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Max 205 g d = 0.01 mg

Pro FACT

METTLER

METTLER TOLEDO

- Set the scale to zero (taring).

Select 2Select 1

⇔

- Your AT now needs the weight of a reference piece number. Press the «Menu» key briefly.

Note:

SEt 10

PCS

This menu selection appears only when weight unit 2 is set to piece .

- If you wish to count out of a container, load the full container.

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Max 205 g d = 0.01 mg

Pro FACT

- Select the desired reference piece number with the «Select 1» key.

The following piece numbers are available:

Operating instructions METTLER TOLEDO AT balances

Page 48

Operating instructions METTLER TOLEDO AT balances

SEt 10

SEt 20

SEt 50

SEt 100

PCS

10 20 50 100

Note: We advise you to select a reference piece number as large as possible since your AT determines the average weight per piece. Since it is seldom the case that all pieces are equally heavy, the reference weight that is stored is naturally more accurate the greater the reference piece number.

- If you wish to count into a container, add the selected number of pieces (reference piece number) of the weighing sample to the container.

- - - - - -

- If you wish to count out of a container, remove the selected number of pieces from the container.

- Press the «Set» key, and the draft shield closes automatically if the automatic door function is switched on. If not, close the draft shield manually or by pressing the right- hand key and then press the

⇔

«Set» key.

As long as the horizontal dashes are displayed, your AT is weighing the reference weight.

Page 49

PCS

+67

-24

PCS

- As soon as the horizontal dashes disappear, the reference piece number and the reference weight have been read in and your AT is ready for counting or weighing.

If the automatic door function is switched on, the draft shield opens automatically on completion of the weighing-in process. If not, open it yourself.

Depending on how you have weighed in the reference weight, you can now:

- Count into the container with display of the total number of pieces in the container or…

-…count out of the container with display of the number of pieces removed from the container.

AUTOCALIN

0.3675

With the key

““

“ you can display either

““

the piece count or the weight (see also Section 5.1).

5.4 How to trigger the adjustment manually

In the factory the balance is preset to proFACT. The AT balance adjusts and linearizes itself as soon as a change in the ambient conditions makes this necessary. You thus need not concern yourself with the adjustment. But you also have the possibility to trigger the motorized adjustment with the internal adjustment weights at all times at a keystroke. This can be practical if the audio warning beep sounds during a weighing and the adjacent symbol appears in the display. This is your AT’s way of showing you that it would like to adjust itself. You can now either interrupt your work at the next convenient opportunity for about 5 minutes, when the AT will adjust itself, or, you yourself can trigger the motorized adjustment by pressing a key.

Operating instructions METTLER TOLEDO AT balances

Page 50

Operating instructions METTLER TOLEDO AT balances

CALIN

Auto off

CAL

USEr

You select the adjustment mode in sector 2 (

SCALE

) of the configuration register (see Section 4.4). In addition to the fully automatic self-adjustment, you have two further adjustment possibilities available:

- You trigger the automatic

adjustment with the internal adjustment weights, with

simultaneous automatic linearization of the measuring range at a keystroke.

- The manual adjustment with an

external adjustment weight,

without linearization of the measuring range.

AUTOCALIN

CAL Int

If you have switched off the automatic self-adjustment, you should adjust the balance occasionally.

Automatic adjustment with the internal adjustment weights at a keystroke

You have this adjustment mode available if you have set the parameter “adjustment and linearization” in sector 2 of the configuration register (basic settings) either to

CALIN Auto oFF

CALIN Auto on

- Repeatedly press the «Menu» key briefly until the adjacent display appears.

Page 51

Max 205 g d = 0.01 mg

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

CAL End

0.0000

Pro FACT

- Trigger the adjustment procedure by pressing the «Set» key. The draft

Manual adjustment with external adjustment weight

shield now closes automatically if the automatic door function is switched on. If not, close the draft shield manually or by pressing one of the two keys.

⇔

You wish to use your own external adjustment weight for the adjustment and have set the parameter proFACT (adjustment and linearization) to «CAL USEr» in sector 2 of the configuration

- You can follow the adjustment and linearization procedure in the numerical display and on the DeltaTrac®, and you also hear

linearization with the built-in adjustment weights is switched off.

when the internal weights are loaded.

- Repeatedly press the «Menu» key

CAL USEr

briefly until the adjacent display

appears. Completion of the adjustment and linearization process is displayed briefly,…

…the audio warning beep sounds and the balance returns to the weighing

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Max 205 g d = 0.01 mg

Pro FACT

- Trigger the adjustment procedure by pressing the «Set» key. The draft shield now closes automatically if the automatic door function is switched in. If not, close the draft shield manually or by pressing one of the two keys.

⇔

mode.

Operating instructions METTLER TOLEDO AT balances

Page 52

Operating instructions METTLER TOLEDO AT balances

CALIN

200.0000

CALIN

0.0000

After a short time, the audio warning beep sounds and the requested, model-dependent adjustment weight appears in the display, for example, 200 g.

- Open the draft shield, load the requested adjustment weight and close the draft shield.

- Wait until the audio warning beep sounds. The display now requests the removal of the adjustment weight.

- Open the draft shield, remove the adjustment weight and close the draft shield.

As soon as the audio warning beep sounds and the adjacent display appears, the adjustment is finished and your AT is again in the weighing mode.

AT201

Cancel

0.1/0.01mg

Configuration

Select 1

⇔

Set

Max 205 g d = 0.01 mg

5.5 How to check whether the balance is still adjusted correctly

In the factory, the balance is set to proFACT, professional fully automatic adjustment and linearization technology. A check of the adjustment is not necessary in this mode. If you have selected the automatic adjustment mode with manual triggering ( of the configuration register (see Section 4.4), it is advisable to check the adjustment with the internal adjustment weights occasionally.

Pro FACT

- Select the menu by pressing briefly

the «Menu» key.

CALIN Auto oFF

) in sector 2

Page 53

AUTOCALIN

CAL Int

CAL tESt

- Repeatedly press the «Menu» key briefly until the adjacent display appears.

Note:

This display does not appear if you have set the parameter “adjustment and linearization” to

CAL USEr

in the configuration register (adjustment with your own external adjustment weight). Please also see the note at the end of this section.

- Select the adjustment test by pressing the «Select 1» key.

- Start the test by pressing the «Set» key. If the fully automatic door function is switched on, the draft shield now closes automatically. If not, you first close the draft shield manually or by pressing one of the

⇔

two keys and then the «Set» key.

199.9999

0.0000

The internal weights are now loaded, without the balance being adjusted, and the current, model-dependent adjustment value displayed, interrupted by the display

tESt

- When you have read off the value, abort the test by pressing the «Set» or «Cancel» key. The balance is then again in the weighing mode.

Notes:

If the deviation of the adjustment weight is more than ±0.00015% (1.5 ppm) from the full load, the balance should be adjusted (see Section 5.4).

If you work with your own, external adjustment weight (parameter “adjustment and linearization” set to

CAL USEr

in the configuration register), you can check the adjustment of the balance by loading your own, external adjustment weights.

Operating instructions METTLER TOLEDO AT balances

Page 54

Operating instructions METTLER TOLEDO AT balances

METTLER TOLEDO

Select 2

⇔

On/Off

5.6 How to print out the weighing result

You can output the weighing result via the interface connection 19 on a printer. If you wish to attach a nonMETTLER TOLEDO printer, you match the para-meters of the data interface to the specifications in the printer handbook (see Section 4.6). You will find further details in the instructions “Bidirectional interface of the METTLER TOLEDO AT balances”, which you can order from METTLER TOLEDO.

- In the weighing mode press the

«Print» key briefly.

68.4325

68.4325 g

- As soon as the result is stable, it is transferred via the interface connection 19 to the printer. Up to the transmission, the triangle symbol is lit up in the display. If the transmission has not yet taken place, you can abort the procedure by pressing the «Print» key again briefly. After the transmission, the result is kept for about 5 seconds in the display for checking purposes, and a ring symbol flashes at the upper right.

- Notes: The type of transmission depends on the selected data transmission mode, which you have set in the fourth sector of the configuration register (see Section 4.6). If you have selected the

S.Stb

S.Auto

mode and the automatic door function is switched on, the draft shield is closed, the result transmitted and then the draft shield opened again. If not, you close the draft shield manually or by pressing one

Page 55

of the two keys.

⇔

- The transmission command can also be triggered with the hand or foot switch (available as an accessory).

5.7 Your AT can also be

remote controlled

The complete operation (keypad and draft shield) as well as the menu and the configuration register of your AT balance can also be controlled via a computer. This allows you to incorporate your AT in an automation system and, for instance, is also suitable for loading by a robot.

The draft shield, the zeroing (taring) of the balance and the print command can also be controlled externally via an electrical contact (relay, proximity switch). The connections for the electrical contacts 18 are at the rear of your AT balance.

Further information regarding the connection of an external robot or an electrical contact can be found in the operating instructions “Bidirectional data interface of the AT balances”.

Operating instructions METTLER TOLEDO AT balances

Page 56

Operating instructions METTLER TOLEDO AT balances

6 Important information regarding your

AT balance

6.1 The AC adapter offers

you various installation options

You can naturally place the AC adapter supplied anywhere in the vicinity of the balance within the radius of the connection cable. But in addition, the AC adapter also offers you two advantageous and space-saving installation possibilities.

Direct attachment to the balance

You can attach the AC adapter directly to your AT balance.

Note:

Owing to the heat developed by the AC adapter, this type of installation is not

advisable with semimicro balances

(resolution 0.01 mg).

- Remove the two fastener screws at the rear of your AT balance.

- Attach the AC adapter holder supplied to the rear of the balance with the two screws. The arrow on the holder must be visible and point upwards.

Page 57

- Position the four feet in the slots of the AC adapter. Hold the connection cable to the right and it slides into the central slot of the holder automatically.

Note:

You can attach the AC adapter such that the power cable exits at the

right.

- Press the AC adapter gently downward the stop.

- Connect the AC adapter first to connection socket 23 of the balance and then to the power supply.

Wall mounting

- If you wish to save space at the workplace, you can mount the AC adapter on the wall:

- Decide on a suitable place for the AC adapter. Take the length of the connection cable into account.

- Use the AC adapter holder as a template to mark out the drill holes.

Operating instructions METTLER TOLEDO AT balances

Page 58

Operating instructions METTLER TOLEDO AT balances

- Drill the holes and use the dowels in the installation set supplied should the wall material require it. Fix the AC adapter holder such that the arrow is visible and pointing upward.

- Hold the unit so that the connection cable exits from the top and position the four feet in the slots in the holder. Hold the connection cable to the right while doing so and it will slide into the central slot of the holder automatically.

Note:

You can also fix the AC adapter so that the connection cable exits from below. In this case hold the connection cable to the left when engaging the AC adapter.

- Press the AC adapter gently downward to the stop.

- Connect the AC adapter first to connection socket 23 and then with the power supply.

6.2 If you change the loca-

tion of your AT

If you wish to relocate your AT, please note the following:

- To transport your balance, grasp it at the front beneath the display and at the back under the balance housing. Never lift up your AT by the draft shield or by using the «ReZero» key!

Page 59

6.3 A well maintained balance is a joy forever

- Clean the weighing pan, the draft

shield and the housing of your AT occasionally with the brush supplied.

If, for example, you wish to clean the base inside the draft shield at the left, start with the brush from

the right or from the top through the weighing chamber and at the same time open the left door with the left hand. Residues that have

accumulated on the base can easily be brushed out. With the AT20 you open the draft shield by pressing either the left or right key.

⇔

- For a thorough cleaning, lift off the

weighing pan 15 and the draft cover 16 vertically upward. After cleaning, replace the weighing pan and the draft cover. When replacing the weighing pan, ensure that it has free movement in its slot and does not

touch the draft cover. If necessary, turn the weighing pan to the correct position.

Cleaning

The balance housing and the weighing pan are made of high-grade, resistant materials. You can thus use any commercially available cleaning agent for cleaning.

- AT balances can best be cleaned with a damp cloth.

Cautionary note

Ensure that no liquid can enter the AC adapter or the balance.

Operating instructions METTLER TOLEDO AT balances

Page 60

Operating instructions METTLER TOLEDO AT balances

6.4 What your AT brings with it

The following accessories are supplied with your AT:

- AC adapter with holder and installa-

tion set

- Operating instructions

- Short-form operating instructions

- “Weighing the right way”

- Cleaning brush

- METTLER TOLEDO weighing

tweezers (for semimicro balances only)

6.5 Additional information and accessories for your AT balance

For below-the-balance weighings your AT is equipped with an opening for a hanger. Open the draft shield and place the balance on its back. Swing the cover of the opening on the underside of the balance aside. You can now attach a pan or a holder to the hook in the opening.

For the expansion of your AT balance, for special applications and for different types of weighing problems a variety of

peripheral units and information brochures are available from

METTLER TOLEDO.

Page 61

7 Any questions?

7.1 What happens

Since it is not always easy to determine the exact cause of an unstable display the most frequent sources of error are listed below.

You will find detailed explanations in the enclosed booklet “Weighing the right way”.

An unsuitable location

Strong drafts (e.g. from air conditioning systems) or vibrations of the bench are factors that can cause disturbances.

- Look for a suitable location, adapt

the vibration adapter to the local conditions (see Section 3.3) and close the draft shield as fully as possible (see Section 2.1).

if the weight display is unstable?

An insufficiently closed draft shield

- Close the draft shield as fully as

possible (see Section 2.1).

Electrostatic charging of weighing samples and containers

This charging frequently appears in heated rooms with dry air (below 4045% rel. humidity) and with weighing samples made of glass or plastic. The electrical charges generate forces that can disturb the weighing.

Operating instructions METTLER TOLEDO AT balances

Page 62

Operating instructions METTLER TOLEDO AT balances

- In the simplest case, it may be sufficient to remove the draft cover 16 and place the weighing sample in a metal container.

Magnetic weighing samples or containers

- In simple cases, it may be sufficient to increase the distance between the weighing sample and the weighing pan. For this, place the weighing sample on a nonmagnetic metallic (e.g. aluminum) or glass vessel. A further improvement can be achieved by removing the draft cover 16.

Weighing samples or containers that are not at ambient temperature

Weighing samples or containers that are warmer or colder than the ambient temperature of the balance can cause disturbing air currents and buoyancy errors. Weight changes due to the uptake or evolution of surface moisture can also be the cause. These lead to wrong or unstable weighing results.

- Wait until the weighing sample and the container have attained the ambient temperature. Do not touch the weighing sample or the container with your hand (about 35 °C), but use only the tongs or the tweezers.

Page 63

Weighing samples or containers that absorb or evolve moisture readily

All weighing samples or containers made of wood, cardboard, paper, cork (e.g. holder for round-bottomed flasks), plastic or rubber can absorb or evolve enough moisture to make the display unstable and cause display of nonreproducible or wrong weighing results.

- If at all possible, containers made of such material should be replaced by metal or glass vessels. If this is not possible, operations should at least be performed in a room with a constant atmospheric humidity.

The weighing sample or the container touches the draft cover

- In such a case remove draft cover

16.

The weighing pan is placed at an angle and touches the draft cover or the base

- Turn the pan to the center position (see Section 6.3).

Contamination

Powder, liquid or other residues at the edge of the weighing pan or between the weighing pan and the draft cover can lead to unstable displays if the weighing pan no longer has completely unrestricted movement.

- Clean the weighing pan and the draft cover (se Section 6.3).

Operating instructions METTLER TOLEDO AT balances

Page 64

Operating instructions METTLER TOLEDO AT balances

The weighing process adapter is switched off

If the weighing process adapter is switched off, the weight display does not always achieve stability when the local conditions are unfavorable and measurements are performed in the semimicro range.

- Use this setting of the weighing process adapter exclusively for applications in which the dynamics of the weighing process are of prime interest (see Section 3.2).

7.2 How can the weighing

speed be increased?

The weighing speed or the stabilization time of your AT is influenced considerably by the following factors and settings:

Vibration adapter

If the local conditions allow (see Section 3.3), you can shorten the stabilization time of your AT by setting the medium or small wave symbol of the vibration adapter. Changing the setting of the vibration adapter by one step causes your AT to react around a third faster.

Readability

If your application allows, you should reduce the readout increments for the last decimal place. The larger the readout increments (e.g. steps of 5 instead of 1), the more rapid the operation of your AT balance (see Section

4.4).

Page 65

Automatic stability detection

Your AT achieves stability quicker if you reduce the stability detection. If you select, for example, stage 1( instead of stage 6 (

ASD –1–

ASD –6–

), the balance releases the weighing result as stable decidedly more quickly (see Section 4.4).

Glass draft shield, Inner draft shield

Your AT operates faster if you open the draft shield to load the balance only as much as necessary. So that excellent weighing results can also be achieved fast under difficult weighing conditions, you can also use an inner draft shield. (Order number 210270). The disturbing effects of any incoming drafts in the weighing chamber are thus lessened (see Section 2.1).

Always select the fastest setting in the menu or configuration register that your application allows. You can naturally combine all measures and

)

hence produce a marked increase in the weighing speed of your AT.

7.3 What happens if…?

…the display remains completely blank?

Possible causes are:

- no power line voltage

- power cable not connected

- wrong power line voltage Check and if necessary rectify the

specified error sources. If the balance does not function after switching on with the «On/Off» key, contact METTLER TOLEDO service.

Operating instructions METTLER TOLEDO AT balances

Page 66

Operating instructions METTLER TOLEDO AT balances

AUTOCALIN

68.4325

– AUTOCALIN –

…during a weighing the audio warning beep sounds and the adjacent symbol appears in the display?

- If the fully automatic self-adjustment is switched on (see Section 4.4), your AT shows that it wishes to adjust itself (AUTOCALIN =

Automatic Calibration and Linearisation). But there is no need

for you to interrupt your work for this. Your AT will wait until you have not worked with the balance for about 5 minutes and will then adjust and linearize itself. During this process, the symbol “AUTOCALIN” flashes.

You also have the possibility, however, to trigger the adjustment immediately with a keystroke. Your method of procedure is described in Section 5.4. The symbol in the display fades when adjustment is ended.

-OFF-

…after connection to the power supply the adjacent display appears?

- You have disconnected your AT from the power supply without previously switching it off by lifting the «On/Off» key,< or a power outage has interrupted the balance operation. After reconnection to the power supply or when the power is restored, the balance is not switched to standby.

- Press the «On/Off» key to switch the balance on again. An extended internal self-test is then run with display of the model designation and the software version. All display segments light up briefly and your AT is then ready for weighing again.

Page 67

0.0000

…the display shows overload or underload?

- Overload is displayed when the weight of the loaded weighing sample is larger than the weighing range.

- Underload is displayed when the weighing range is not reached. This applies when the weighing pan is missing, or the weighing pan touches the draft cover and no longer has unrestricted movement. In this case switch the balance off, position the weighing pan correctly and then switch your AT on again.

…the display “0.0000” flashes?

Zero is not defined:

- Place the weighing pan on the balance.

- Remove the load from the weighing pan.

…the glass draft shield is somewhat difficult to open in manual operation?

- Free the motor coupling by gently jerking the draft shield slider back and forth.

…the graphic indicators suddenly disappear?

- Depending on the setting in the configuration register, the graphic indicators are either displayed permanently or only for a few minutes after the balance has been switched on (see Section 4.5).

Operating instructions METTLER TOLEDO AT balances

Page 68

Operating instructions METTLER TOLEDO AT balances

…the balance returns automatically from the menu or the configuration register to the weighing mode?

- You have selected the menu or the configuration register and not pressed a key for 1 minute. Your AT thus assumes that you do not wish to make any changes and returns to the weighing mode.

…no weighing results or nonsensical characters are printed out on the attached printer?

- To ensure correct functioning of the attached printer, different settings have to be made in the configuration register, including values for the data transmission and the parity (see Section 4.6). Information regarding the correct settings can be found in the handbook of your printer.

…the triangle symbol appears in the display?

68.4325

- You have pressed the «Print» key. Your AT signals that it is ready to transmit a released weighing result (stability indicator faded) via the interface (e.g. to a printer).

…a flashing circle appears above the weight unit?

68.4325 g

- If a weighing result has been transmitted via the interface (with the «Print» key), in fully automatic operation the draft shield opens automatically. So that you can check the result or if need be note it down, the display remains “frozen” for 5 seconds, and this is indicated by the flashing circle.

Page 69

7.4 What does this error message mean?

- Error messages in the display draw

your attention to faulty operation, namely that the balance was not able to perform a procedure properly. Error messages are supported by an audio signal (“twitter”).

Wrong or missing reference weight

- If one of the application units per-

cent (%) or piece ( been selected as weight unit 2, the balance must have a reference weight available. The following errors can appear:

Stk

PCS

) has

no rEF

Err rEF

Err LOAd

- No reference weight has been loaded.

- A wrong reference weight has been loaded.

- The balance returns automatically to the weighing mode.

The weight lies outside the tolerance

The following causes could be responsible:

- a wrong external adjustment weight.

- the weighing pan is loaded during the adjustment.

The adjustment procedure is aborted automatically and the balance returns to the weighing mode.

bAd LOAd

Operating instructions METTLER TOLEDO AT balances

- You have started the adjustment test. A weighing sample is still on the weighing pan. Remove it.

Page 70

Operating instructions METTLER TOLEDO AT balances

Err. unStb

Err tiNE

Fault in the adjustment

- The adjustment procedure of the balance has been disturbed.

- The adjustment is automatically aborted and the balance returns to the weighing mode.

The wait time of 1 minute has run out

This could have the following causes:

- You have set the automatic stability detection (ASD) at a too high stage. After pressing the «Print», «ReZero» or «Set» key (

with %, Stk

or PCS), stability is not reached within 1 minute.

- The weight for the external adjustment has not been loaded.

CAL tESt

- A wrong weight has been loaded. The corresponding procedure is abor-

ted automatically and the balance returns to the weighing mode.

7.5 What does this term mean?

We have “translated” the most important technical terms for you. References (in italics) show you the section(s) in which you can find further information.

Adjustment

Matching the balance to a reference weight. Adjustment, see also proFACT.

Sections 4.4, 5.4 and 5.5

Adjustment test

Test function which can be called up in the menu to allow checking of the adjustment without adjustment actually being performed.

Section 5.5

Page 71

Ambient conditions

Local conditions at the location of the balance. The following local conditions can lead to display errors during weighing: unsuitable location, changes in the temperature, atmospheric humidity or the atmospheric pressure, magnetic fields, electrostatic forces, vibrations, drafts caused by air conditioning.

Section 7.1

Analytical balance

Balance with a readability of 1 d (1 digit) = 0.1 mg.

Analytical range

Weighing range with a readability of 1 d (1 digit) = 0.1 mg.

Section 2.4

Application unit

Unit selectable in the configuration register that is used for applications in which not only the weight, but also a quantity derived from it (piece, percent) is determined and displayed.

Sections 4.5, 5.2 and 5.3

Automatic door function

Automatic opening and closing mechanism for the glass draft shield that ensures that the balance and the draft shield are always in the correct position for the next weighing step.

Section 3.4

Automatic stability detection

Continuous automatic check of the weight value for stability. The weight display is considered stable when its change with time lies within a preset limit. Different stages can be configured by the user and correspond to various limits. The stability of the display is attained when the stability detection symbol in the upper left corner of the display fades. Also with Re-Zero (taring) the display is set to zero only when stability has been achieved.

Section 4.4

Operating instructions METTLER TOLEDO AT balances

Page 72

Operating instructions METTLER TOLEDO AT balances

Autozero

Automatically corrects the zero display if drifting occurs or the weighing pan is contaminated.

Section 4.4

Baud rate

See “Data transmission rate”. Bit (Binary digit)

Unit used for the information content of a communication.

Section 4.6

Coarse range

Normal weighing range with ten times less resolution than the fine range. See also “Dual-range balances” (semimicro balances) and “DeltaRange® balances”.

Sections 2.3 and 2.4

Configuration

The sum total of all settings selected for the parameters in the configuration register.

Section 4

Configuration register

Register with tree-like structure in which operational settings, weight units and much more can be matched to the needs of the user. The configuration register can be protected against inadvertent changes with the aid of the jumper.

Section 4 and pages 82 and 83

Configuring

Changing the settings in the configuration register.

Section 4

Page 73

Data transmission rate

Specifies the rate at which the data are transferred. Also called baud rate: 1 baud = 1 bd = 1 bit/second.

Section 4.6

DeltaRange® balance

Balance with a fine range recallable at any time over the entire weighing range.

Section 2.4

DeltaTrac®

Dynamic graphic indicator with 60 radial indicators. Displays the used and remaining weighing range. Graphic complement to the alphanumeric display; also suitable for use as a weighing-in aid.

Sections 2.2 and 5.2

Differential weighing

Determination of the weight of a sample before and after a weight change.

Digit

Display unit; a digit corresponds to a display increment of the last decimal place.

- 1 digit = 1d = 0.1 mg in the analyti-

cal range

- 1 digit = 1d = 0.01 mg in the semi-

micro range

7.6 How are weight units converted?

The following table will facilitate the conversion between the weight units available for the AT .

Gram Milligram Carat Ounce Troy Ounce Pennyweight g mg ct/C.M. oz ozt dwt

1 g = 1 1000 5 0.03527396 0.03215075 0.6430149

1 mg = 0.001 1 0.005 0.0000352740 0.0000321508 0.000643015 1 ct/C.M. = 0.2 200 1 0.007054792 0.006430150 0.1286030

1 oz = 28.34952 28349.52 141.7476 1 0.9114585 18.22917 1 ozt = 31.10347 31103.47 155.5174 1.097143 1 20

1 dwt = 1.555174 1555.174 7.775869 0.05485714 0.05 1 1 GN = 0.06479891 64.79891 0.3239946 0.002285714 0.002083333 0.041666667

(metr.) (avdp) koil

1 tl (HK) = 37.429 37429 187.1450 1.320269 1.203370 24.06741

1 tl (SGP/Mal) = 37.79937 37799.37 188.9968 1.333333 1.215278 24.30556 1 tl (Taiwan) = 37.5 37500 187.5 1.322774 1.205653 24.11306

1 mo = 3.75 3750 18.75 0.1322774 0.1205653 2.411306

Operating instructions METTLER TOLEDO AT balances

Page 82

Operating instructions METTLER TOLEDO AT balances

Grain Tael Tael Tael Momme GN tl tl tl mo

1 g = 15.43236 0.02671725 0.02645547 0.02666667 0.2666667 1 mg = 0.01543236 0.0000267173 0.0000264555 0.0000266667 0.000266667

1 ct/C.M. = 3.086472 0.005343450 0.005291094 0.005333333 0.05333333 1 oz = 437.5 0.7574213 0.7500000007 0.7559874 7.559873

1 ozt = 480 0.8309993 0.8228570 0.8294261 8.294260 1 dwt = 24 0.04154997 0.04114285 0.04147131 0.4147130

1 GN = 1 0.001731249 0.001714286 0.001727971 0.01727971

1 tl (HK) = 577.6178 1 0.9902018 0.9981068 9.981068

1 tl (SGP/Mal) = 583.3334 1.009895 1 1.007983 10.07983

(Hongkong) (Singapur) (Taiwan)

(Malaysia)

1 tl (Taiwan) = 578.7134 1.001897 0.9920800 1 10 1 mo = 57.87134 0.1001897 0.09920800 0.1 1

Page 83

7.7 Where will I find details

of…?

The following index shows you the page number of these instructions on which you will find the information appropriate to a particular theme. The page numbers in bold print refer to the most important information for the specific search word.

Absolute weighing 18 AC adapter 4, 53 Accessories 57 Adjustment 30, 46, 48, 66, 67 Adjustment mode 31, 47, 49 Adjustment weight 49 Adjustment test 50 Application unit 33, 68 Applications 41, 43 Automatic door function 20, 68 Automatic door operation 20 Automatic stability detection 27, 68 Autozero 29, 69

Beeper setting 34 Below-the-balance weighing 57

Cleaning 56 Configuration register 22, 69

Data interface 35 DeltaTrac® 11, 42, 48 DeltaRange® balance 11 Dispensing 18 Draft shield 8 Drop symbol 17

Electrostatic charging 58 Error message 66 External adjustment weight 31, 48

Factory setting 27, 71 Fine dispensing 18 Fine range 11, 71

Glass draft shield 8 Interface 35, 71 Jumper 39

Operating instructions METTLER TOLEDO AT balances

Linearization 30, 47, 72

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Operating instructions METTLER TOLEDO AT balances

Magnetic weighing samples or containers 59 Manual adjustment 47, 48 Menu 14

Operational setting 22, 26 Overload 64

Percent 41 Percent weighing 41, 73 Piece counting 21, 43, 73 Power outage 8, 63 Printer 38, 51 proFACT 30, 46, 73 Program cassette 39, 73

Readout increment 28 Reference weight 41, 45, 74 Repeatability 28, 74 Resolution 11, 74 Re-Zero 74

Self-adjustment, fully automatic 31, 46 Self-test 5, 8, 75 Semimicro balance 12, 75 Setting options 14, 22 Stability detection 27, 68, 75 Stabilization time 61, 75 Standby 7, 75 Status indicators 34, 76 Switching off the balance 7, 63

Taring 5, 76 Underload 64

Unstable display 20, 58 Vibration adapter 19, 76

Vibrations 19 Wait condition 76

Wave symbol 19 Weighing in 18 Weighing mode 5, 76 Weighing process adapter 17, 77 Weighing speed 28, 61, 76, 77 Weight unit 32, 33, 40, 77

Page 85

Weighing mode

press and hold key

Menu Configurations register

Set reference 1) weight for %

SEt 100 %

///

Set reference 1) weight for piece

SEt Stk

Operational setting

SEttINGS

Return to factory setting

rESET

100 10

50 20

Internal adjustment

CAL

External 3) adjustment

CAL USEr

tESt Int

Basic settings

SCALE

Automatic stability detection

ASd

oFF -1-

-7- -2-

-6- -3-

-5- -4-

Readability 5)

d 1 mg

d 0.5 mg d 0.2 mg

d 0.1 mg

Weight units

Unit

Weight unit 1

Unit 1

mo g

CM mg

ct oz

dwt ozt

GN tI

Weight unit 2

Unit 2

Interface

Int-FACE

Data transmission mode

Data transmission rate

Cont Stb

Auto ALL

9600 150

4800 300

2400 600

1200

Page 86

Set weighing process adapter

Set vibration adapter

—

fully automatic door function

door Auto

–—

Std Auto

Parity

PAr

Transmission protocol

End-of-line mode

EOL

SPc -E-

oFF -O-

PAUSE CL

Soft oFF

HArd

cr crLF

Readability 4) semimicro range 5)

Autozero

proFACT (Adjustment and linearization)

CALIN

dF 0.1 mg

dF 0.05mg dF 0.02mg

dF 0.01mg

oFF on

USEr Auto on

Auto oFF

Stk mg

PCS oz

mo ozt

CM tI

ct GN

dwt

Status indicators

- ,

on Auto

Beeper setting

bEEP

oFF on

Menu Configuration register

Selection of the menu Selection of the

Selection of the menu options configuration register

Selection of the settings Selection of the parameters

Select 1

Cancellation of the changes Selection of the settings

Cancel

and return to the weighing mode Storage of the current menu Cancellation of the changes

Set

and return to the weighing mode and return to the weighing mode Switching off the balance by Storage of the current configuration

Set

pressing key upward and return to the weighing mode

Configuration

Selection of the sectors

Select 1

Select 2

Cancel

Set

1) Appears only if weight unit 2 is set in the configuration register to percent (%) or piece (

2) Appears only if the internal adjustment ( configuration register.

3) Appears only if the external adjustment ( configuration register.

4) Appears only with semimicro and DeltaRangeR balances.

5) The following appears with the AT20: d = 0.01 mg*, 0.02 mg, 0.05 mg, 0.1 mg / dF = 2 µg*, 5 µg, 10 µg

The following appears with the AT460 DeltaRange®: d = 1 mg*, 2 mg, 5 mg, 10 mg / dF = 0.1 mg*, 0.2 mg, 0.5 mg, 1 mg

* Factory setting

Stk

PCS

Auto Off

) is set in the

USEr

) is set in the

Page 87

Technical specifications (after a warm-up time of at least 120 min.)

Modell AT21 AT20 AT201 AT261 DeltaRange® AT200 AT400 AT460 DeltaRange®

Readability 1 µg2 µg 0.01 mg 0.01 mg 0.1 mg 0.1 mg 0.1 mg 0.1 mg 1 mg Weighing capacity 22 g 22 g 205 g 62 g 205 g 205 g 405 g 62 g 405 g Taring range (by subtraction) 0…22 g 0…22 g 0…205 g 0…205 g 0…205 g 0…205 g 0…405 g 0…405 g 0...405 g

Repeatability (s) full load 2 µg4 µg 0.04 mg 0.04 mg 0.05 mg 0.07 mg 0.15 mg 0.15 mg 0.3 mg Repeatability (s) 0...50 g 0.015 mg 0.015 mg 0.04 mg 0.05 mg 0.05 mg

Linearity ± 6 µg ± 10 µg ± 0.12 mg ± 0.08 mg ± 0.15 mg ± 0.15 mg ± 0.5 mg ± 0.5 mg ± 1.4 mg Linearity within 500 mg Linearity within 10 g

Stabilization (typical) 14...18 s 10...14 s 10...14 s 8...12 s 3...5 s 3...5 s 4...6 s 4...6 s 3...5 s Built-in adjustment weights 2x10 g 2x10 g 2x100 g 2x100 g 2x100 g 2x100 g 2x100 g Adjustment proFACT Fully automatic motorized self-adjustment with two built-in weights.

Adjustment with external weight: 20 g 20 g 200 g 200 g 200 g 400 g 400 g Display with DeltaTrac® LCD (liquid crystal) VFD (Vakuumfluoreszenz) Display sequence 0.2...0.4 s variable Sensitivity: - Temperaturedrift

- Long-term stability 3)with self-adjustment proFACT: ±1.5 ppm Linearization Automatic self-linearization of the weighing curve (simultaneously with motorized adjustment proFACT) Data interface CL and RS232C, bidirectional, built in as standard, all lines galvanically separated. Glass draft shield No hindering guideways; automatic motorized opening or at a keystroke. Inner draft shield Standard Accessory Equipment designed test conditions P: 115 V or 230 V, admissible voltage fluctuation: -20% +15%, frequency 50/60 Hz, max. power consumption 15.5 W.

Power supply (national codes) S: 12.8 V=, 6.5 V=, 10.8 V=, 16.7 V=

Weighing pan with feedthrough for ø 28 mm ø 32 mm 80x80 mm; stainless steel below-the-balance weighing suspended

Measures Free height above weighing pan 239 mm, Balance housing 241x433x289 mm (W x L x H), power supply 115x140x53 mm (W x L x H) Weight Balance 9.3 kg, AC adapter 1.2 kg

: In the temperature range 10...30 °C 2): 1 ppm = 1/1'000'000 (relative to the current weight display)

Comparator 60g DeltaRange® 200g 60g DeltaRange® 400g

± 4 µg ± 6 µg

± 0.03 mg ± 0.03 mg

The accuracy of the adjustment depends on the geographic location and the height above sea level.

1) 2)

±1.5 ppm/°C

Pollution degree 2. Overvoltage category II. Temperature: 5...40 °C. max. relative atmospheric humidity: 80% for temperatures up to max. 31 °C linearly decreasing to 50% at 40 °C. Height: 6000 m. Use only indoors in closed rooms.

: Sensitivity deviation / year with self-adjustment proFACT switched on

Operating instructions METTLER TOLEDO AT balances

Page 88

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Mettler Toledo AT Balances, AT20, AT201, AT261, AT460 Operating Instructions Manual

Contents

1 The AT smooths the way

1.1 The new weighing feeling

1.2 Preparing your AT

1.3 Weighing made simple

2.1 A glass draft shield with unlimited possibilities

2.3 Is your AT a DeltaRange® balance?

2.4 How you can weigh in the coarse and fine range

3 Your AT is an adaptable balance

3.1 What is the menu?

3.3 How to adapt your AT to the local conditions

3.4 How to switch off the fully automatic door function

4 Additional possibilities with your AT

4.1 What is the configuration register?

4.2 How is the configuration register used?

4.3 In the first sector you return to the factory settings

4.4 The second sector offers you numerous adaptation possibilities

4.5 In the third sector you select the weight units and additional settings

4.6 In the fourth sector the AT reveals itself as a balance ready to communicate

5.1 Your AT can work with two weight units

5.2 Your AT also weighs in percent and shows plus/ minus deviations

5.3 Should your AT count pieces?

5.4 How to trigger the adjustment manually

5.5 How to check whether the balance is still adjusted correctly

5.6 How to print out the weighing result

6.3 A well maintained balance is a joy forever

6.4 What your AT brings with it

6.5 Additional information and accessories for your AT balance

7 Any questions?

7.3 What happens if…?

7.4 What does this error message mean?

7.5 What does this term mean?

7.6 How are weight units converted?