Mettler Toledo WXS205DU/15, WXSS204, WXS205DUV/15, WXS204V/15, WXSS205DU Instructions For Installation And Operation Manual

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Page 1

Instructions for Installation and Operation METTLER TOLEDO

WXS and WXT Weighing Modules

Page 2

Load Cells

1 Housing (WXT: white powder-

coated, WXS: stainless steel)

2 Weighing pan retainer

with plastic cover

3 Connector for electronic unit

4 Hanger opening for weighing

below (on bottom side)

5 Level bubble (leveling aid,

on WXT model only)

6 Adjustable feet (WXT only)

7 Base plate with mounting

ﬂange (WXS only)

Electronic units

8 Housing (WXT: white powder-

coated, WXS: stainless steel)

9 Load cell connector

10 Terminal connector

11 Optional interface plug-in

12 “Aux” connectors (for

“ErgoSens,” hand or footoperated buttons)

13 RS232-C standard interface

14 Connector for AC adapter

Terminals

15 Display (PWT: color,

SWT: monochrome)

16 Keyboard

17 “SmartSens” sensors

(PWT only)

The WXS and WXT weighing modules at a glance

WXT WXS

PWT SWT

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Weighing pans

18 Standard weighing pan

19 Adapter weighing pan

Mounting materials

20 Mounting bracket for WXS

electronic unit, including DIN clip and screws

21 Terminal holder for SWT

terminal, including screws

Connecting cables

22 Electronic unit – load cell

connector cable (0.5m/1.6ft or

1.5m/5ft long) Note: The maximum allowable

cable length is 5m/16.4ft.

23 Terminal – electronic

unit connector cable (0.575m/1.9ft or 2m/6.5ft long)

Note: The maximum allowable cable length is 5m/16.4ft.

Power supply

24 25

24 AC adapter

25 Power cable (country-

speciﬁc)

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Contents

1 Introduction .................................................................................................................................................... 6

1.1 Introduction to the WXS/WXT weighing modules ............................................................................................................ 6

1.2 What you should know about this manual .....................................................................................................................6

1.3 Safety ﬁrst! ...................................................................................................................................................................7

1.4 Available documentation ..............................................................................................................................................8

2 Initial startup of weighing modules .................................................................................................................. 9

2.1 Unpacking the weighing module and notes on packaging..............................................................................................9

2.2 Scope of delivery .......................................................................................................................................................10

2.3 Assembling of WXS weighing module .........................................................................................................................11

2.3.1 Load cell installation ..................................................................................................................................................11

2.3.2 Electronic unit assembly and mounting ....................................................................................................................... 12

2.4 Weighing module WXT setup ...................................................................................................................................... 12

2.4.1 Choosing a location ................................................................................................................................................... 12

2.4.2 Levelling the load cell.................................................................................................................................................13

2.5 Place weighing pan....................................................................................................................................................13

2.5.1 Standard weighing pan ..............................................................................................................................................13

2.5.2 Adapter weighing pan ................................................................................................................................................14

2.5.3 Notes on weighing below ...........................................................................................................................................14

2.5.4 Overload protection .................................................................................................................................................... 15

2.6 Connect load cell and electronic unit ..........................................................................................................................16

2.7 Connect terminal and adjust settings .......................................................................................................................... 16

2.7.1 SWT Terminal ............................................................................................................................................................16

2.7.2 PWT Terminal ............................................................................................................................................................17

2.8 Connect the unit to the power supply .......................................................................................................................... 18

3 Conﬁguring the weighing module .................................................................................................................. 19

3.1 Extended SICS command set for WXS/WXT weighing modules without terminal ............................................................21

3.2 Standard SICS command set for WXS/WXT weighing modules without terminal .............................................................21

3.3 Preparatory steps for conﬁguration ..............................................................................................................................24

3.4 Conﬁguring the weighing module ...............................................................................................................................25

3.4.1 Adjusting the weighing module ................................................................................................................................... 25

3.4.2 Set readability ............................................................................................................................................................25

3.4.3 Set stability criteria .....................................................................................................................................................26

3.4.4 Activating and deﬁning the ﬁxed ﬁlter .......................................................................................................................... 28

3.4.5 Adjustments to ambient conditions (ﬁlter damping) .....................................................................................................29

3.4.6 Setting the update rate for continuous weight transmission ..........................................................................................29

3.4.7 Recording user settings .............................................................................................................................................. 30

3.4.8 Resetting user-speciﬁc settings to factory default .........................................................................................................31

3.4.9 Information on the memory location for user-speciﬁc settings ...................................................................................... 32

4 Weighing operation ......................................................................................................................................33

4.1 Transmission of weight values ....................................................................................................................................33

4.2 Taring function ........................................................................................................................................................... 34

4.3 Zeroing functions ....................................................................................................................................................... 35

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Contents

4.4 Troubleshooting weighing module errors and malfunctions .........................................................................................36

4.4.1. If your weighing module doesn’t perform correctly until it has been powered up for quite a while .................................. 36

4.4.2 If the weighing module does not transmit the expected weight readings ....................................................................... 36

4.4.3 If the weighing module doesn’t react to your commands at all ..................................................................................... 36

5 Maintenance and Service .............................................................................................................................. 37

5.1 Cleaning the weighing module ...................................................................................................................................37

5.2 Maintenance .............................................................................................................................................................37

6 Technical Data, Accessories, and Replacement Parts ....................................................................................... 38

6.1 General data .............................................................................................................................................................. 38

6.2 Model-speciﬁc data ....................................................................................................................................................40

6.3 Key to types and list of available models .....................................................................................................................42

6.4 Dimensions ...............................................................................................................................................................43

6.4.1 WXS load cell dimensional drawing ............................................................................................................................43

6.4.2 WXT load cell dimensional drawing ............................................................................................................................. 44

6.4.3 Adapter weighing pan dimensional drawing ................................................................................................................ 45

6.4.4 WXS electronic unit dimensional drawing (including mounting bracket) ....................................................................... 45

6.4.5 WXT electronic unit dimensional drawing (including terminal holder) ...........................................................................46

6.4.6 SWT terminal dimensional drawing (mounted using terminal holder) ........................................................................... 47

6.4.7 PWT terminal dimensional drawing ............................................................................................................................ 48

6.4.8 Adapter for weighing below (optional), dimensional drawing ........................................................................................49

6.5 RS232C interface (standard interface) speciﬁcations ................................................................................................... 50

6.6 Speciﬁcation for Aux connections ................................................................................................................................ 50

6.7 Accessories and Replacement Parts ............................................................................................................................51

6.7.1 Accessories ...............................................................................................................................................................51

6.7.2 Replacement parts ..................................................................................................................................................... 52

7 Appendix .....................................................................................................................................................53

7.1 Conversion table for weight units ................................................................................................................................ 53

7.2 SOP - Standard Operating Procedure ........................................................................................................................... 54

7.3 Updating ﬁrmware ......................................................................................................................................................55

7.4 Glossary ....................................................................................................................................................................55

8 Index ........................................................................................................................................................... 58

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Introduction

1 Introduction

Thank you for choosing a METTLER TOLEDO weighing module. This section will provide you with basic information on the WXS and WXT weighing modules. Even if you have previous experience with

other scales or METTLER TOLEDO scales, please read this section carefully. It is VERY IMPORTANT that you obey all safety instructions!

1.1 Introduction to the WXS/WXT weighing modules

These instructions apply to all WXS and WXT weighing modules. The models differ in their weighing ranges, resolution, mechanical structure, features, and the included accessories. The text makes a special point of mentioning items that have an impact on operating the unit.

The weighing modules are available in two different versions: a benchtop version (WXT) and a component version (WXS). Each weighing module consists of a load cell, an electronic unit and a terminal (optional). The load cell and electronic unit are avail-

able in either a benchtop or component version. There are two terminals available that can be used with both the benchtop and the component versions. The smaller SWT terminal has a monochrome display and built-in applications. The large PWT terminal has a color display, supports multiple user proﬁles and also has an added “MinWeigh” application. There are separate instruction manuals available for the terminals.

All WXS/WXT models have the following features: – “Fact” adjustment and linearization with two internal weights – Integrated RS232C interface – Optional interface plug-in – Standard weighing pan and additional adapter weighing pan provided for users to create their own setups – Plastic cover provided for cleaning the weighing module and establishing ingress protection of IP65 – A full set of cables and mounting accessories is provided – A CD-ROM with additional instructions and a PC program for setup and operation of the weighing module are also included

A brief word regarding standards, directives and procedures for quality assurance: The WXS and WXT weighing modules comply with all commonly accepted standards and guidelines. They support standard processes, requirements and work methodologies in accordance with GLP (Good Laboratory Practice) and GMP (Good Manufacturing Practice) and allow for the creation of SOPs (Standard Operating

Procedures). The WXS/WXT weighing modules have been issued a CE-Declaration of Conformity. METTLER TOLEDO, the manufacturer,

is both ISO 9001 and ISO 14001certiﬁed.

1.2 What you should know about this manual

The following conventions apply to the entire manual:

These symbols mark safety and hazard warnings. Failure to comply with these warnings may result in personal risk to the user, damage to the weighing module or other property, or unit malfunction.

This symbol marks additional information and notes. Following these instructions will make it easier for you to work with the weighing module and ensure proper and efﬁcient use of the unit.

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Introduction

These symbols mark speciﬁc information on setting up, conﬁguring, or operating weighing modules without a terminal (“–T”) or with a terminal (“+T”).

+T–T

1.3 Safety ﬁrst!

Please follow the tips and instructions given below on the safe operation of your WXS/WXT weighing module. Always operate and use your weighing module solely in accordance with the instructions given in this manual. Failure to do so may limit the protection the unit can offer you. Be sure to follow the instructions on the initial startup of your new weighing module.

WXS/WXT weighing modules may be used only in closed indoor spaces. Never operate these units in areas where there is any explosion hazard.

METTLER TOLEDO recommends that you use the AC adapter provided with your unit to operate it. Make sure that the voltage printed on the adapter matches your local power supply. Plug the adapter into a grounded outlet only.

Your WXS/WXT weighing module is built to be tough, but it is still a precision instrument. Handle it carefully.

Do not open the weighing module. There are no user-servicable parts inside. If you should ever have a problem with your weighing module, please contact the METTLER TOLEDO ofﬁce nearest you.

Use only METTLER TOLEDO accessories and peripheral devices with your weighing module; these items are designed to work optimally with your WXS/WXT weighing module.

Disposal

In compliance with the requirements of the EU Waste Electrical and Electronic Equipment Directive 2002/96/EU (WEEE), this unit may not be disposed of with household waste.

The spirit of this Directive also applies to countries outside the EU in accordance with currently valid national regulations.

Please dispose of this product in compliance with local regulations in a separate collection for electrical and electronic equipment.

If you have any questions, please contact the responsible authority or the dealer from whom you purchased your unit.

If you sell or give your unit to someone else (e.g., for private or commercial/industrial use), this stipulation must be made known to the new owner as appropriate.

Thank you for helping protect the environment.

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Introduction

1.4 Available documentation

The table below lists all documentation available for the WXS and WXT weighing modules, along with the document numbers for each document.

German English French Spanish Italian

Instructions for Installation and Operation of the WXS and WXT weighing modules (this document)

11780991 11780992 – – –

MT-SICS reference manual – 11780711 – – – Instructions for SWT terminal

(XS scale instruction manual, Part 2)

11781117 11781118 11781119 11781120 11781121

Instructions for PWT terminal (XP scale instruction manual, Part 2)

11781076 11781077 11781078 11781079 11781080

The CD-ROM (11781008) provided with your unit includes all of the documents listed above. Also, printed copies of all instructions are provided in the language of the country to which the unit is delivered. Printed instructions for SWT or PWT terminals are included only for weighing modules with terminals.

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Initial startup of weighing modules

2 Initial startup of weighing modules

This section tells you how to unpack your new weighing module, set it up, and prepare it for operation.

2.1 Unpacking the weighing module and notes on packaging

The load cell, the electronic unit, and the terminal are each packed in separate cardboard boxes along with the associated hardware and appropriate mounting materials. The boxes are labeled with their contents as follows: “Weighing Module,” “Electronic Unit,” and “Terminal”. Depending on whether you’ve ordered a weighing module with or without a terminal, you will receive either 2 or 3 boxes that are placed inside a large transport box.

Unpacking the electronic unit and terminal:

Remove the top foam cushion and remove the electronic unit and the hardware.

Unpacking the load cell: Remove the black foam cushion and take out the hardware. Carefully lift the white cushion containing the load cell out of the box and place it on a

level surface.

Carefully pull the white cushioning material a few inches apart and remove the load cell.

Keep all packaging in case you need to ship the module in the future; the weighing module should only be transported in its original packaging.

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Initial startup of weighing modules

2.2 Scope of delivery

The scope of delivery for your weighing module depends on the speciﬁc model that you ordered. Please check the scope of delivery using the following table. If any parts are missing or defective, please report this to your METTLER TOLEDO representative or the shipper immediately.

WXS204/15

WXS205DU/15

WXS204V/15

WXS205DUV/15

WXSS204

WXSS205DU

WXSS204V

WXSS205DUV

WXTS204

WXTS205DU

WXTS204V

WXTS205DUV

WXTP204

WXTP205DU

WXTP204V

WXTP205DUV

“Weighing Module” Box

WXS load cell (component version) with attached plastic cover to cover the weighing pan retainer.

WXT load cell (benchtop version) with attached plastic cover to cover the weighing pan retainer.

Standard weighing pan

Adapter weighing pan

WXS/WXT weighing module instructions (this document)

Production certiﬁcate and CE Declaration of Conformity

CD-ROM with instructions and PC software

“Electronic Unit” Box

WXS electronic unit (component version)

WXT electronic unit (benchtop version)

Electronic unit-load cell connector cable,

0.5m/1.6ft long Electronic unit-load cell connector cable,

1.5m/5ft long Mounting bracket for electronic unit,

including clip and screws for attaching to DIN standardized rail

Terminal holder, including screws (for attaching the terminal to the electronic unit)

AC adapter

Power cable (country-speciﬁc)

MT-SICS reference manual

“Terminal” Box

SWT terminal (monochrome display), including protective covering

PWT terminal (color display), including protective covering

Terminal-electronic unit connector cable,

0.575m/1.9ft long Terminal-electronic unit connector cable,

2m/6.5ft long Terminal instruction manual

(XS/XP instructions, Part 2)

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Initial startup of weighing modules

2.3 Assembling of WXS weighing module

The WXS (component version) weighing modules can be integrated into higher-level systems (machines, systems, etc.). Be sure to follow the tips in the following sections to select the optimal installation method

2.3.1 Load cell installation

The weighing modules were designed to record weights very quickly and accurately under normal conditions and communicate the result using the integrated interface and/or display the result on a terminal. In practice, ambient conditions (vibration, oscillations, shocks, air movements and temperature changes) affect weighing time and achievable accuracy as well as the repeatability.

You can adjust various parameters on your weighing module (Section 3). We recommend that you adjust the settings to the levels needed for your application; higher requirements increase the weighing time (period between the placement of the weight and the availability of a stable result).

Filter settings must be stricter to compensate for unfavorable ambient conditions (Section 3); this also has a negative impact on weigh-

ing time. Therefore, be sure to note the following: – Mount the load cell on a base that is mechanically decoupled from the system and therefore free of shocks and vibration. If a

mechanical decoupling is not possible, place appropriate cushioning between the system and the load cell mount.

– The location of the load cell should not be in areas that are exposed to drafts, direct

sunlight, or severe temperature ﬂuctuations.

– Make sure that any vibrations in the building are not transferred through the ﬂoor and

to the load cell

– Make sure that the load cell is as perfectly horizontal as possible. Use a precision level

to achieve exact leveling. It is acceptable to have a unit that is not perfectly horizontal if its position is not altered after it has been adjusted (e.g., if it is mounted in a ﬁxed position in the system).

– Attach the load cell to the base across as wide an area as possible. Use the appropri-

ate bores in the front part of the cell’s base plate (4x M5 screws, tightening torque 4 – 6Nm). The base must be perfectly planar to avoid putting tension on the load cell base plate.

– Make sure that vibrations cannot be transferred across the connector cable between

the load cell and the electronic unit.

– Make sure that the load cell housing is connected in an electrically conductive manner

with the machine structure.

If your requirements are extremely demanding (short weighing time, high accuracy), we recommend that you try a test setup ﬁrst and test the entire system under real-world conditions using various settings (Section 3). This will allow you to tweak the system and optimize it bit by bit.

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Initial startup of weighing modules

Pick a location that is stable, vibration-free and shock-free, and as horizontal as possible. The ﬂoor beneath the weighing module must be able to safely hold the weighing module with the maximum possible load on the load cell.

Take care to ensure the proper ambient conditions (Section 6).

Avoid: – Direct sunlight – Strong drafts (e.g. from fans or climate-control systems) – Extreme temperature ﬂuctuations.

2.4 Weighing module WXT setup

The WXT weighing module (benchtop version) does not require any assembly work. Note the information in the following sections about choosing an optimal location and leveling the load cell.

2.4.1 Choosing a location

Your weighing module is a precision instrument. Provided with an optimal location, it will reward you with great accuracy and reliability.

Remove the two existing screws from the bottom side of the electronic unit (Torx T-20) and use the provided Torx T-20 countersunk head screws (A) to secure the mounting

bracket.

Secure the clip (B) to the front face or underside of the mounting bracket. Use the two provided M4 pan head screws (Torx T-20) to do so.

Note: The electronic unit can also be attached directly to the mounting bracket (without a clip) via the M4 thread using a support.

Important: The electronic unit meets the requirements for protection class IP40. If required, appropriate protective measures must be taken to protect the unit from dirt.

Additional assembly items: – Place weighing pan (Section 2.5) – Connect load cell and electronic unit (Section 2.6) – Connect terminal and adjust settings (Section 2.7) – Connect the unit to the power supply (Section 2.8)

2.3.2 Electronic unit assembly and mounting

The electronic unit can be mounted in any position you wish. A mounting bracket and clip for attaching the unit to a DIN standardized

rail are provided. Proceed as follows for mounting:

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Initial startup of weighing modules

2.4.2 Levelling the load cell

Once the load cell has been set up at the desired location, the load cell must be horizontally aligned (leveled).

The load cell is equipped with a level (level bubble) and two adjustable feet. The load cell is completely horizontal when the bubble is precisely in the middle of the level window (left image = properly level, right image = not properly level).

Adjust both feet as necessary until the air bubble is right in the middle of the level window.

Note:You should always level the load cell after moving it to a new location.

Additional tasks:

– Place weighing pan (Section 2.5) – Connect load cell and electronic unit (Section 2.6) – Connect terminal and adjust settings (Section 2.7) – Connect the unit to the power supply (Section 2.8)

2.5 Place weighing pan

The WXS and WXT weighing modules come with two weighing pans: a standard weighing pan and an adapter weighing pan for users to create their own setups.

2.5.1 Standard weighing pan

Remove the white plastic cover (A) from the load cell. This cover protects the weighing pan retainer (B) from damage during transport and keeps liquid out of the load cell during cleaning. Make sure you keep the cover in a safe place!

Place the weighing pan cone into the weighing pan retainer. You do not need to insert it in any speciﬁc position; the standard weighing pan will turn freely.

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Initial startup of weighing modules

2.5.2 Adapter weighing pan

The adapter weighing pan is used for customer-speciﬁc setups to hold the object to be weighed.

The customer-speciﬁc setup can be attached to the weighing pan using the three 120° offset M3 threaded holes (A). See Section 6 for the exact dimensions of the adapter weighing pan.

Keep in mind that your setup must weigh at least 55 g to ensure that the required dead

load of 65 g (weighing pan + setup) is reached. If the required dead load is not reached,

the weighing module will output an underload error message upon startup. To preserve the full weighing range, the total preload (weighing pan + setup) may not

exceed 88 g. Heavier preloads will take away from the available weighing range.

Because customer-speciﬁc setups generally remain in a ﬁxed position, the adapter weighing pan has a positioning pin (B). This pin ﬁts perfectly in the wider of the two grooves in the weighing pan retainer (C) and prevents the weighing pan from turning freely. However, this

anti-displacement measure works only up to a certain torque. If this torque is exceeded,

the weighing pan and weighing pan retainer turn together to prevent damage to the load cell. At the same time, the weighing pan retainer serves a protection from lateral forces.

2.5.3 Notes on weighing below

For weighing beneath the work area (weighing below), the load cell is equipped with a hanger opening. For weighing below, the item to be weighed is not placed on the weighing pan; it is placed on an application-speciﬁc receptacle attached beneath the load cell. For weighing below, the standard weighing pan is removed, and the weighing pan retainer is closed up using the plastic cover so that dirt and foreign matter cannot penetrate the load cell.

Here are some examples of when weighing below is used: – when it is difﬁcult or impossible to put the material to be weighed on the weighing pan – when space will not allow for items to be weighed from above – when weighing from above might soil or contaminate the load cell.

The hanger opening is on the bottom of the cell under a round cover (A).

You’ll need the optional weighing below adapter, which should be installed by a METTLER TOLEDO service technician if possible, to attach the customer-speciﬁc receptacle (see Section 6 for information on how to order).

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Initial startup of weighing modules

Please keep the following in mind when planning a weighing below receptable for objects to be weighed:

– The ﬁxture must weigh at least 52 g, to ensure that the required dead load of 65 g

(weighing below adapter + ﬁxture). If the required dead load is not reached, the weighing module will output an underload error message upon startup. To preserve the full weighing range, the total weight of the weighing below adapter and ﬁxture may not exceed 88 g. Heavier preloads will take away from the available weighing range.

– Secure the ﬁxture to the M4 thread of the weighing below adapter (max. penetration

depth: 8mm, max. tightening torque: 1 Nm, see also dimensional drawing in Section

6.4.8).

– Position the ﬁxture’s center of gravity as close to and vertically beneath the attachment

point as possible.

– The weighing receptacle must hang freely from the attachment point of the weighing

below adapter without touching non-moving parts of the load cell or the system. The maximum diameter or cross-section of the ﬁxture at the attachment point is 8 mm.

– Limit the vertical and horizontal movement and/or torsion of the ﬁxture by using me-

chanical stops to prevent overload of the load cell.

– To minimize weighing time, avoid vibrations and shocks to the ﬁxtures and the objects

to be weighed.

2.5.4 Overload protection

The WXS/WXT weighing modules have overload protection that is effective in all directions up to the following limit values:

Vertical load: 5 kg (all types; centered load) Lateral load: 1 kg (protected by torsion protection; see Section 2.5.2) Torsion: Protected by torsion protection (see Section 2.5.2)

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Initial startup of weighing modules

2.6 Connect load cell and electronic unit

Use the provided cable (0.5 m or 1.5 m long) to connect the load cell to the electronic

unit (a 5 m cable is available as an accessory).

Tighten the plugs on both devices.

Note: The load cell and the electronic unit can be replaced independently of each other if necessary.

Lay the cable so that no one will trip over it and so that no vibration can travel up the cable and be transferred to the load cell.

2.7 Connect terminal and adjust settings

You’ll need this section only if your weighing module was delivered with a terminal.

2.7.1 SWT Terminal

Place the terminal on a ﬂat surface with the display face down. Press the two tabs (A) on the back of the terminal to open it, and open the bottom of the terminal (B).

Feed the terminal cable through the cutout in the back of the terminal and plug in the jack (C). Make sure that the strain relief (D) is inside the terminal.

If you want to permanently afﬁx the terminal to the electronic unit, you can also attach the terminal holder now:

Place the terminal holder (E) into the corresponding cutout on the bottom of the terminal and use the knurled screw (F) provided to secure it from the inside of the terminal.

A A

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Initial startup of weighing modules

Close the bottom of the terminal. Then push in the two side tabs to completely close the terminal.

Note: You can also use the two tabs on the back side to adjust the viewing angle of the terminal while it is in operation: Press both buttons simultaneously and pull the top of

the terminal gently upwards, or press it down until it clicks into the desired position. You can choose from three different positions.

Remove the two screws (Torx T-20) in the bottom of the electronic unit and store them in a safe place. Align the terminal holder exactly with the two bores and secure it with the Torx T-20 countersunk head screws (G).

Plug the terminal cable plug (H) into the appropriate jack on the back of the electronic unit and screw in to tighten. Try to run the terminal cable as close as parallel as possible to the terminal holder.

2.7.2 PWT Terminal

Place the terminal on a ﬂat surface with the display face down. Press the two tabs (A) on the back of the terminal to open it, and open the bottom of the terminal (B).

Feed the terminal cable through the cutout (C) in the bottom of the terminal and plug in the jack (D). Make sure that the strain relief (E) is inside the terminal.

Close the bottom of the terminal. Then press the two tabs (A) on the back of the terminal to completely close the terminal.

Note: You can also use the two tabs on the back side to adjust the viewing angle of the terminal while it is in operation: Press both tabs simultaneously and pull the top of the

terminal gently upwards, or press it down until it clicks into the desired position. You can choose from three different positions.

Plug the terminal plug into the appropriate jack on the back of the electronic unit and screw in to tighten.

A A

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Initial startup of weighing modules

2.8 Connect the unit to the power supply

The electronic unit for your weighing module is delivered with an AC adapter and a power cord for your country. The AC adapter is suit- able for use with the following voltage range:

100 – 240 VAC, 50/60Hz (see Section 6 for exact speciﬁcations). Check whether your local power supply falls within this range. If it does not, DO NOT connect the electronic unit or the AC adapter

to your power supply and contact your local METTLER TOLEDO ofﬁce.

Connect the AC adapter (A) to the connector (B) on the back of the electronic unit and to your power supply. Tighten the connector to ensure a good connection to the electronic unit.

Important: Be sure to lay the cables so that they cannot be damaged or get in your way while you’re working! Remember that the AC adapter may NOT come into contact with any liquids!

Once the weighing module has been connected to the power supply, the weighing module will perform a self-test, and then it will be ready to operate.

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Conﬁguring the weighing module

3 Conﬁguring the weighing module

Once the weighing modules have been installed, they must be conﬁgured, i.e., prepared for operation. For weighing modules with terminals, nearly all conﬁguration work can be performed via the terminal; weighing modules without a terminal are conﬁgured using MT-SICS commands issued from a host computer. An expansion of the MT-SICS command set is available for product-speciﬁc conﬁgu- ration work.

All weighing modules come from the factory with a built-in RS232C interface. In addition, the modules can be equipped with a second optional interface (Section 6) that is inserted into the electronic unit. The optional interfaces are delivered with their own instructions describing installation and all conﬁguration work needed.

The procedure for conﬁguring the weighing modules and interface functionality depend on how the individual weighing module is equipped. There are four possible conﬁgurations:

1 Weighing module without terminal, with built-in RS232C standard interface 2 Weighing module without terminal, with built-in RS232C standard interface and additional optional interface 3 Weighing module with terminal and built-in RS232C standard interface 4 Weighing module with terminal, built-in RS232C standard interface, and additional optional interface.

The following page provides an overview of the various conﬁgurations and the available settings.

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Conﬁguring the weighing module

Conﬁguration

Interface/commands

1 2 3 4

HOST interface Built-in RS232C Optional interface (the built-in

RS232C can be used during operation to connect a printer, for example).

Built-in RS232C (can be conﬁgured via the terminal for “host”, see Terminal instructions)

Choice of built-in RS232C or

optional interface (the terminal

can be used to conﬁgure one of the interfaces for the “host,” see terminal instructions).

Setting interface parameters via MT-SICS “COM” command Host interface: Configured

using SICS command “COPT” via the built-in RS232C (if present—otherwise, a terminal can be hooked up and used to conﬁgure the interface). Built-in RS232C: Not conﬁgurable; will always work with the factory settings..

Via terminal (as per terminal instructions)

Extended SICS Level 3 instruction set for the HOST interface

Commands as in Section 3.1. Note: All SICS commands in the list in Section 3.2 are also supported.

Not available Not available

Expanded SICS Level 3 commands for second interface

––– Commands as in Section 3.1.

Note: All SICS commands in the list in Section 3.2 are also supported (including the “COPT” command to configure the “Host” interface) EXCEPT “SIR,” “SR,” and “SNR”..

––– Not available

“FastHost” commands (as per MT-SICS reference manual)

Available on host interface Available on host interface Available on built-in RS232C,

assuming it is conﬁgured as host interface

Available on built-in RS232C, assuming it is conﬁgured as host interface

Notes When the terminal is removed,

the system behaves like a weighing module without a terminal, with a RS232C standard interface (Conﬁguration 1)

When the terminal is removed, the system behaves like a weighing module without a terminal, with a RS232C standard interface and additional optional interface (Conﬁguration 2)

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3.1 Extended SICS command set for WXS/WXT weighing modules without terminal

The following commands were added to the MT-SICS Level 3 command set speciﬁcally for the conﬁguration of WXS/WXT weighing modules:

Command Meaning

FCUT Set ﬁlter characteristics (limit frequency) RDB Set readability USTB Set stability criteria FSET Restore factory settings LST List user settings

3.2 Standard SICS command set for WXS/WXT weighing modules without terminal

The following list provides an overview of the commands from the standard SICS command set that WXS/WXT weighing modules with- out terminals support. For more detailed information on the individual commands and their parameters, refer to the MT-SICS manual provided with your system:

Command Meaning

SICS Level 0

I0 Lists all commands supported by SICS levels 0-3 I1 Lists supported MT-SICS level and MT-SICS versions I2 Inquiry of weighing module data I3 Inquiry ofSW version and type deﬁnition number I4 Inquiry ofserial number I5 Inquiry of software veriﬁcation number S Send stable net weight SI Send current net weight without regard for stability SIR Send continuous current net weight without regard for stability. Note: This command is not available in the built-in

RS232C standard interface on weighing modules without a terminal and with the optional interface. Z Zero ZI Zero without waiting for stability @ Cancel current commands and send serial number to host

SICS Level 1

SR Send stable weight when weight changes (repeatedly). Note: This command is not available in the built-in RS232C

standard interface on weighing modules without a terminal and with the optional interface. T Trigger taring TA Inquire and set tare memory TAC Clear tare memory TI Trigger taring without waiting for stability. Note: Only permitted on non-calibrated modules.

SICS Level 2

C0 Inquiry/setting of adjustment status Note: Only possible when adjustment is permitted. C1 Adjust using current conﬁguration. Note: Only possible when adjustment is permitted. C2 Adjust using external weight. Note: Only possible when external adjustment is permitted. C3 Adjust using internal weight. Note: Only possible when internal adjustment is permitted.

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Command Meaning

COM Conﬁguration command for built-in RS232C standard interface. Note: This command is only available for weighing

modules without a terminal and without the optional interface.

COPT Conﬁguration command for optional interface. Note: This command is only available for weighing modules without

a terminal and with the optional interface. The command is only available via the built-in RS232C standard

interface. DAT Inquiry/setting of date I10 Inquiry/setting of weighing module ID I11 Inquiry/setting of module type I14 Inquiry of information on the weighing module I15

Inquire duration of operation of the weighing module in minutes since startup I16

Inquiry of next service date I21

Inquiry of assortment tolerance dataset version I22

Inquiry of linearity tolerance I23

Inquiry of repeatability tolerance I24

Inquiry of sensitivity tolerance I25

Inquiry of shift tolerance I26

Inquiry of operating mode M01 Inquiry/setting of weighing mode (ﬁlter characteristics) M02 Inquiry/setting of ambient parameters (ﬁlter damping) M03 Inquiry and activation/deactivitation of AutoZero (automatic zeroing) M17 Inquiry/setting of FACT time criterion. Note: Only possible when time-controlled FACT adjustment is permitted. M18 Inquiry/setting of FACT temperature criterion. Note: Only possible when temperature-controlled FACT adjustment

is permitted. M19 Inquiry/setting of external adjustment weight. Note: Only possible when external adjustment is permitted M20 Inquiry/setting of external test weight. M21 Inquiry/setting of weighing units M27 Inquiry of user adjustment history M28 Inquiry of temperature values M29 Inquiry/setting of reading release M31

Operating mode of the weighing module following restart. Note: Only parameters of 0 (standard) or 3 (diagnostic

mode) are allowed M32

Inquiry/setting of FACT time criteria. Note: Only possible when time-controlled FACT adjustment is permitted. The

“M32” command is the same as the “M17” command, but it has additional setting options. M33

Inquiry/setting of ProFACT days of the week. Note: Only possible when time-controlled FACT adjustment is permit-

ted. M35

Deﬁne zero at power-up (0 = normal, 1 = start in the future with a momentary zero). Note: Command permitted

only on non-calibrated weighing modules. SIS Send net weight with weighing unit and additional information SNR Send continuous stable weight following a deﬁned change in weight. Note: This command is not available in the

integrated RS232C standard interface on weighing modules without a terminal and with the optional interface. TIM Inquiry/setting of time TST0 Inquiry/setting of test conﬁguration (check adjustment with external test weight)

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Command Meaning

TST1 Start test sequence with current conﬁguration TST2 Start test sequence with external weight TST3 Start test sequence with internal weights. Note: Only possible if internal test weight is present UPD Inquiry of host interface update rate

FAST Host

B00 Lists all available FastHost commands (“Bxx”) B01 Inquiry of individual reading B02 Start/stop continuous data transmission B03 Inquiry of reading counter time base (SV counter) B04 Inquiry/setting of FastHost format speciﬁcation B05 Inquiry/setting of FastHost stability criteria B06 Inquiry/setting of FastHost output reduction (output cycle) B07 Inquiry/setting of automatic sending following restart B08 Zeroing using FastHost stability criterion (“B05”)

These commands are not yet listed in the current MT-SICS reference manual. For more information, please contact your local

METTLER TOLEDO sales ofﬁce.

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3.3 Preparatory steps for conﬁguration

For weighing modules with terminals, the conﬁguration tasks described in the following sections are performed using the terminal. Therefore, no preparatory work is required; however, it is assumed that you have the terminal instructions handy and are already familiar with how to operate the terminal and use the menu structure.

On SWT terminals, the menu options for conﬁguring the weighing module are with the system settings. On PWT terminals, part of the conﬁguration menu is also with the system settings. Because the PWT terminal

supports multiple users, additional conﬁguration options are located with the user-speciﬁc settings. The conﬁguration tasks described in the following section are for weighing modules without a terminal. At the

end of each section, you will see a note for users of weighing modules with terminals telling you where the equivalent settings can be found on the terminal.

Weighing modules without a terminal are confugred via the interface with MT-SICS commands. You’ll need a

host computer (PC) and a terminal program to do this. Under Microsoft Windows XP® , you can use HyperTerminal,

which is included with Windows. Microsoft Windows Vista® does not come with a terminal program. In this case, you can use the “WM_term_disp” program (“WM Terminal Display”) provided on the CD-ROM. You can use this program to conﬁgure the PC interface and transmit SICS commands, among other things. Please read the help ﬁle on the CD-ROM before you install “WM_term_disp.”

Connect the host computer with the built-in RS232C standard interface on the weighing module. Set the communications parameters of the terminal program as follows:

Baud rate: 9600 Data bits: 8 Stop bits: 1 Parity: None End of line: <CR><LF> Handshake: Xon/Xoff

These are the factory settings for the built-in RS232C standard interface on the weighing module. For weighing modules that have only a RS232C standard interface, you can change the RS232C standard

interface communications parameters using the “COM” command (SICS level 2). Once you have made your changes, you must adjust the terminal program’s communications parameters accordingly so that you can continue to communicate with the weighing module.

For weighing modules that have an additional optional interface, you can conﬁgure them using the “COPT” command “SICS level 2). Only the RS232C standard interface supports the “COPT” command; therefore, for this conﬁguration, the weighing module must ﬁrst be connected with the host computer via the standard interface. Once you have conﬁgured your system, you can connect the host computer with the optional interface. The RS232C standard interface itself cannot be conﬁgured; it always uses the factory settings (see above). If an optional interface is available, the RS232C standard interface is used as a service interface. Note: If you have a terminal, you can connect it temporarily and conﬁgure the optional interface using the terminal. This is easier and faster than conﬁguring it with the “COPT” command. Once you’ve conﬁgured the optional interface, you can disconnect and remove the terminal.

The next section describes the most important conﬁguration task (user settings) with special consideration given to the expanded MT-SICS command set for WXS/WXT weighing modules without a terminal (Section 3.1). The standard SICS commands are available for additional conﬁguration work (Section 3.2).

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3.4 Conﬁguring the weighing module

It is recommended that the weighing modules are conﬁgured before they are used in order to achieve best weighing performance. The following sections provide information on the most important conﬁguration tasks.

3.4.1 Adjusting the weighing module

Following initial startup, the weighing module must be adjusted using a built-in or external weight. Various parameters can be set for the adjustment. The WXS/WXT weigh modules have the ProFACT fully automatic adjustment function. During operation, ProFACT adjusts the module automatically on the basis of speciﬁed criteria.

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For weighing modules without a terminal, the commands “C0,” “C1,” “C2,” and “C3” (SICS level 2) are used for the adjustment and the corresponding settings. If you use an external adjustment weight, you can set its weight using the “M19” command. The fully automatic ProFACT adjustment function can be conﬁgured with the “M17” and “M18” commands. You can ﬁnd the corresponding explanations in the MT-SICS reference manual.

Weighing module with terminals: The settings for manual adjustment and the ProFACT fully automatic adjustment function are part of the system settings. See the description of the “Weighing” application for how to perform the adjustment. You can ﬁnd more information in the terminal instructions.

3.4.2 Set readability

Readability refers to the smallest difference in weight that the weighing module can still measure and transmit via the interface and/or

show on the display (see also the technical data in Section 6). The factory-set readability (= maximum possible number of places after the decimal point) can be reduced if necessary to shorten weighing time.

For weighing modules without a terminal , use the “RDB” command to set readability:

Command: RDB Inquire current readability Answer: RDB A dp Readability expressed as the number of places after the decimal point (dp)

when weighing in grams (g).

Command: RDB dp Set readability (dp = number of places after the decimal point) Responses: RDB A Command executed, readability set

I4 A "..." Restart performed (the system always restarts after readability has been

set)

Responses (errors): RDB L Incorrect “dp” parameter

RDB I Command cannot be executed right now ES Terminal connected

For example: RDB 2 Set readability to 2 places after the decimal point (0.01 g) Responses: RDB A Command executed

I4 A "..." Restart performed

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Notes:

– The deﬁnition of readability always uses grams (g) as the unit, regardless of what the current unit of display

is.

– The “RDB” command will let you reduce readability by a maximum of 3 places after the decimal point below

the maximum resolution of the weighing module.

– Once an “RDB” command has been executed, the weighing module automatically restarts, a new zero point

is set, and the tare memory is cleared.

– The selected readability affects various other settings and functions such as stability criteria for weighing,

taring, and zeroing as well as adjustment.

For weighing modules with a terminal, use the “1/10d” function key to set readability. Note: Depending on your particular weighing module, you may have several of these function keys available, such as “1/100d” and “1/1000d”. For more information on these function keys, see the description for the “Weighing” application (terminal instructions).

3.4.3 Set stability criteria

The stability criterion speciﬁes when a weighing result is considered stable. A stability criterion must also be fulﬁlled to perform the zeroing and taring functions. A separate stability criterion can be deﬁned for every mode (weighing, zeroing, and taring). A value is considered to be stable when it moves within a deﬁned bandwidth during a speciﬁed observation period. These two parameters (length of observation and bandwidth) deﬁne the stability criterion.

For weighing modules without a terminal, use the “M29” command (refer to the MT-SICS reference manual) or the “USTB” command (explained below) to set stability criteria.

Important: This command is not available to users with calibrated scales!

Command: USTB Inquire all stability criteria Response: USTB B 0 0.000 0.000

USTB B 1 0.000 0.000 USTB A 2 0.000 0.000

Current stability criteria for weighing, taring, and zeroing

Command: USTB x Inquire stability criterion for speciﬁc mode:

x = 0: Weighing x = 1: Taring x = 2: Zeroing

Response: USTB A 1 0.000 0.000 Current stability criterion (Example “Taring”)

Command: USTB x y z Set stability criterion:

x: Modes (0, 1 or 2, see above) y: Bandwidth (in digits of current readability) z: Observation period (in seconds)

Response: USTB A Command executed, stability criterion set

Responses (errors): USTB L Incorrect parameter (e.g. bandwidth > 100d, observation

period > 10s )

ES Calibrated scale or terminal connected

For example: USTB 0 5.0 0.3 Set stability criterion for weighing with a bandwidth of 5 digits

and an observation period of 0.3 seconds

Response: USTB A Command executed

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The ﬁgure below illustrates how the stability criterion works.

Notes: – At the factory, all “USTB” stability criteria are set to 0.0000 (in this case, the settings for reading release are

used that were set with the “M29” command). – A bandwidth of <0.001d and an observation period of <0.001 s are interpreted as 0.0. – If one of the parameters for the “USTB” command is not equal to zero, the setting for reading release (“M29”

command for the corresponding mode (weighing, taring, or zeroing) is invalidated. – The observation period is event-oriented; it restarts each time the reading falls outside the deﬁned

bandwidth – The stability criteria apply to the entire weighing range; it is not possible to adjust them when the weighing

range (gross/ﬁne range for dual-range weighing modules) changes. – The user-speciﬁc stability criteria take effect only when the system is operated without a terminal. If a terminal

is later connected, the settings saved in the terminal become effective. – For adjustment, factory-set stability criteria are always used, with consideration given to the reading release

setting (“M29” command).

For weighing modules with a terminal, stability criteria settings (reading release) are part of the weighing parameters. On the SWT terminal, you’ll ﬁnd these settings in the system settings; on the PWT terminal, they are under the user-speciﬁc setttings.

0.0 0.1

0.2 0.3

0.0 0.1

0.2 0.3

The value measured at the end of the observation period is transmitted as a stable value or saved as a tare value.

Time [s]

Tolerance exceeded. Wait until the stability criterion is met.

Criterion met Criterion not met

Time [s]

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3.4.4 Activating and deﬁning the ﬁxed ﬁlter

Use the “M01” command to set the weighing type and the “M02” command to set the ambient conditions (Section 3.4.5). These two settings determine the type and strength of signal ﬁltering that will occur.

For the “Sensor mode” weighing type, the “FCUT” command offers an additional option for deﬁning ﬁlter behavior. Filtering in “Sensor

mode” is chronologically linear (ﬁxed, non-adaptive ﬁlter) and is appropriate for continuous reading processing.

Important: The “FCUT” command is only available for the “sensor mode” weighing type. The ﬁxed ﬁlter is deactivated at the factory.

Command: FCUT Inquire cut-off frequency of the ﬁxed ﬁlter Response: FCUT A frq frq = currently set cut-off frequency (in the 0.1 Hz – 10.0 Hz range)

Command: FCUT frq Set cut-off frequency for the ﬁxed ﬁlter (frq = 0.1 Hz – 10.0 Hz) Response: FCUT A Command executed, cut-off frequency set

Responses (errors): FCUT L Incorrect parameter (outside the allowed range)

FCUT I Command cannot be executed right now ES Terminal connected

Example 1: FCUT 0 Set cut-off frequency to 0 (= ﬁxed ﬁlter deactivated = factory setting) Response: FCUT A Command executed, cut-off frequency set to 0

Example 2: FCUT 3.4 Set cut-off frequency to 3.4 Hz Response: FCUT A Command executed, cut-off frequency set to 3.4Hz

Notes: – The ﬁxed ﬁlter is deactivated at the factory, and the ﬁltering is deﬁned by setting the ambient conditions (“M02”

command, see Section 3.4.5).

– If the ﬁxed ﬁlter is activated (frq ≠ 0), it will override any settings for ambient conditions (“M02” command)

in sensor mode.

– Values for frq < 0.05 will be interpreted as zero (in this case, the ﬁlter frequency will be used in accordance

with the “M02” command)

For weighing modules with a terminal, selecting the weighing type is part of the weighing parameters. On the SWT terminal, you’ll ﬁnd these settings in the system settings; on the PWT terminal, they are under the userspeciﬁc settings. The ambient conditions (Section 3.4.5) determine ﬁlter damping of the weighing signal. These two settings determine the ﬁltering of the weighing signal. When you activate the sensor mode, the weighing module automatically works with a factory-deﬁned ﬁxed ﬁlter with 5 selectable levels.

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3.4.5 Adjustments to ambient conditions (ﬁlter damping)

Adjusting ﬁlter damping allows for the weighing module to be otimally adapted to ambient conditions at the site. This setting determines how quickly the weighing module will react to a change in weight, but also how sensitive the module will be to outside disturbances. Strong ﬁlter damping will cause the module to react more slowly to small changes in weight, but it will also make it less sensitive to ambient conditions such as air movements and vibration. This also increases the achievable measurement accuracy (repeatability). You can also affect the effective measurement accuracy and the weighing time by changing the settings for stability criteria (Section

3.4.3).

For weighing modules without a terminal, use the “M02” command to adjust your system to ambient conditions (ﬁlter damping). This command from the standard SICS command set (level 2) is described in the MT-SICS reference manual.

Note: If the “sensor mode” weighing type is active, and the “FCUT” command has been used to deﬁne a ﬁxed ﬁlter (Section 3.4.4), the ambient condition settings for the “sensor mode” will not take effect. In this case, the weigh signal is processed by the ﬁxed ﬁlter.

For weighing modules with a terminal, adjusting the system to ambient conditions is part of the weighing parameters. On the SWT terminal, you’ll ﬁnd these settings in the system settings; on the PWT terminal, they are under the user-speciﬁc setttings.

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3.4.6 Setting the update rate for continuous weight transmission

For weighing applications such as dosing to a speciﬁed target weight, the weighing module must constantly record weight changes and forward the readings regardless of their stability to the dosing system so that it can control the dosing process. In such cases, you should activate the “send continuous” mode to ensure a continuous ﬂow of weight readings and set the number of weight readings to be transmitted each second via the interface (update rate).

For weighing modules without a terminal, use the “SIR” command (standard SICS level 0) to activate the “send continuous mode” mode. Use the “UPD” command (standard SICS level 2) to set the number of weight readings to be transmitted per second.

Notes: – For weighing modules with an optional interface, the “SIR” command is available on the optional interface

(host interface), but not on the RS232C standard interface. – Update rates of up to 92 readings per second are possible.

For weighing modules with a terminal, you can activate the “send continuous” mode and set the update rate as part of the interface deﬁnition in the system settings.

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3.4.7 Recording user settings

The current user settings can be output through the interface.

For weighing modules without a terminal, use the “LST” command (expanded SICS command set for WXS/WXT weighing modules) to output a list of all user-speciﬁc settings. The following example shows part of such a list:

LST B C0 0 0 "" LST B FCUT 2.800000 LST B M01 0 LST B M02 2 LST B M03 0 LST B M07 0 LST B M17 00 00 00 0 LST B M18 1 . LST A USTB 2 0.0000000 0.000000

This list can also be used as follows to restore the settings under the following conditions: – The command identiﬁer “LST B” or “LST A” at the beginning of each line must be removed, including the space

after it. – A break of 300 ms must be added after each line. – Empty text strings (“ ”) and the space before them must be removed. This applies to the parameters “C0” and

“TST0,” for example.

For weighing modules with terminals, both the system settings and the user-speciﬁc settings can be recorded. While viewing the system settings or user-speciﬁc settings, simply press the Print key on the terminal (key with the printer symbol). The current settings will be output via the interface.

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3.4.8 Resetting user-speciﬁc settings to factory default

The current user-speciﬁc settings can be reset to the factory default if necessary.

For weighing modules without a terminal, use the “FSET” command to reset:

Command: FSET x Settings to be reset:

x = 0: All settings except communication parameters for the interface(s) x = 1: All settings including user adjustments and communication para-

meters for the interface(s)

x = 2: All settings except communication parameters for the interface(s) and

user adjustments

Responses: FSET A Command executed, selected settings reset

I4 A "..." Restart performed (the system always restarts after settings have been

reset)

Responses (errors): FSET L Incorrect parameter for “x” (see above)

FSET I Command cannot be executed right now ES Terminal connected

For example: FSET 1 Reset all settings back to factory defaults Response: FSET A Command executed

I4 A "..." Restart performed

Notes:

– The date (“DAT”) and the time (“TIM”) are not reset with the “FSET” command. – If the communications parameters are reset (“FSET 1”), the reset will not occur until there is conﬁrmation that

the command has been executed (response).

– The "FSET" command cannot be cancelled (with the @ command).

Weighing modules with terminals: On the SWT and PWT terminal, all settings can be reset in the system settings. On the PWT terminal in the userspeciﬁc settings area, you also have the option of resetting only the settings for the current user proﬁle. Please read the notes and warnings on this subject in the terminal instructions.

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3.4.9 Information on the memory location for user-speciﬁc settings

The memory location for user settings depends on whether you have a weighing module with or without a terminal.

For weighing modules without a terminal, some user settings are permanently stored in the electronic unit, which are the following:

Command Setting

FCUT Fixed ﬁlter for sensor mode I10 ID of the weighing module M01 Weighing mode (ﬁlter properties) M02 Ambient parameters (ﬁlter damping) M03 AutoZero (automatic zeroing) M17 ProFACT time criterion M18 ProFACT temperature criterion M19 External adjustment weight M20 External test weight M21 Weighing unit M29 Reading release M31 Operating mode of the weighing module following restart M32 ProFACT time criteria M33 ProFACT days of the week M35 Zeroing upon startup USTB Stability criteria UPD Update rate for the interface

Note: The parameters for the “C0” (adjustment status) and “TST0” (test conﬁguration) commands are not permanently stored in the electronic unit.

For weighing modules with a terminal, all user settings are permanently stored in the terminal. Exceptions: The settings for zeroing upon startup (“M35”) and for the update rate for the interface (“UPD”) are

stored in the electronic unit.

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4 Weighing operation

This section contains helpful tips for weighing operation and information on possible error messages. Weighing modules with terminals are operated using the terminal, and all error messages are displayed in plain English on the terminal; consult the terminal instructions for more information.

Information in this section applies to users with weighing modules without a terminal. The MT-SICS commands listed here are only some of the available commands you can use in weighing operations. See the MT-SICS reference manual for more information and detailed command descriptions.

4.1 Transmission of weight values

The readings transmitted via the interface refer either to zero or to the reading created as a result of the tare command, depending on whether zeroing or taring was the last function performed. Note that the system zeroes automatically each time it is powered up (zeroing upon startup). Commands that cannot be executed successfully until a stability criterion is met will cancel if stability is not attained within approx. 40 seconds (timeout).

Weight query and transmission of a single stable weight reading

Command: S Transmits the current stable weight reading. If the weighing module is in

the stabilization phase, the weight reading will not be sent until the stability criterion for weighing has been met.

Response: S S [current weight reading] g Stable weight value (the second “S” stands for “stable”)

Response (errors): S I Command cannot be executed, e.g., because the stability criterion for weigh-

ing was not met (timeout).

Weight query and immediate transmission of a single weight reading

Command: SI Immediate transmission of the current weight reading, regardless of its

stability.

Responses: S S [current weight reading] g Stable weight value

S D [current weight reading] g Non-stable weight reading (the “d” stands for “dynamic = not

stable”)

Automatic transmission of each stable weight reading after a change in weight

Command: SNR Transmits the current stable weight reading, and automatically sends all

subsequent weight readings that fulﬁll the stability criterion after any change in weight. You can input the weight change that is necessary to trigger transmission as needed. If you do not want any more readings, cancel automatic transmission with commands such as “S,” SI,” or “@” (reset).

Response: S S [current weight reading] g Stable weight value. After a change in weight and subsequent stabilization,

the module will automatically transmit the next stable weight reading.

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Continuous transmission of all weight readings (“continuous mode”)

Command: SIR Continuously transmits all weight readings, regardless of their stability. This

continuous transmission mode is particularly helpful for dosing to a speciﬁed target weight because it allows the continuous changes in weight to be tracked. The effective number of transmitted readings per second may not deviate more than 1 reading per second from the set transmission rate.

Responses: S S [current weight reading] g Stable weight value

S D [current weight reading] g Dynamic, non-stable weight reading

4.2 Taring function

Taring with fulﬁllment of the stability criterion

Command: T This command makes the current stable weight reading (that references the

current zero) the tare weight, transfers it to the tare memory, and transmits it across the interface. The current weight reading will then be set to zero. If the weighing module is in the stabilization phase, the command will not be executed until the stability criterion for taring has been met, or it will cancel in the event of a timeout.

Response: T S [current tare reading] g The current stable weight reading (net weight) has now been set to zero..

Response (error): T I Tare function cannot be carried out. This could occur if the current weight

reading (referencing the current zero) is negative, or if the stability criterion for taring has not been met (timeout).

Immediate taring without regard for the stability criterion

Command: TI The current weight reading referencing the current zero is immediately

considered to be the tare weight. It is transferred to the tare memory and transmitted across the interface, regardless of whether the stability criterion for the taring function has been met. The current weight reading (net weight) will then be set to zero.

Responses: TI S [current weight reading] g The current stable weight reading (net weight) has now been set to zero.

TI D [current weight reading] g The current dynamic weight reading (net weight) is set to zero (the “D” stands for

“dynamic = not stable”). In this case, the zero is also considered unstable.

Response (error): TI I Command cannot be executed – this may happen if the current weight read-

ing referencing the current zero is negative.

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4.3 Zeroing functions

Zeroing creates a new zero (reference point), sets the current weight reading to zero, and clears the tare memory.The weighing module automatically zeroes itself each time it is powered up. If the weighing module cannot zero upon power-up due to ﬁlter settings and prevailing ambient conditions, it will time out, and the system zero will be used. This means that all weight values will reference this zero. You will not be able to perform a test or an adjustment until a zero command is successfully executed.

Zeroing with fulﬁllment of the stability criterion

Command: Z Creates a new zero. If the weighing module is in the stabilization

phase, the command will not be executed until the stability criterion for zeroing has been met.

Response: Z A The current stable weight reading is set to zero and the tare memory

is cleared.

Response (error): Z I Command cannot be executed, e.g., because the stability criterion

for zeroing was not met (timeout).

Immediate zeroing without regard for the stability citerion

Command: ZI A new zero is immediately set, regardless of whether the stability cri-

terion for zeroing has been met. The tare memory is then cleared.

Responses: ZI S Zeroed on the basis of a stable weight reading.

ZI D Zeroed on the basis of a dynamic weight reading (the “D” stands for

“dynamic = not stable”).

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4.4 Troubleshooting weighing module errors and malfunctions

Go through each of the steps offered here and try to remedy the problem yourself – it may be due to system settings. Never, ever open the weighing module housing.

4.4.1. If your weighing module doesn’t perform correctly until it has been powered up for quite a while

If the weighing module responds to transmission, taring, or zeroing commands with “S I”, “T I” or “Z I” for a long time after being powered up:

• Check ambient conditions.

• Check your zero after power-up by executing an “SI” command. If the weight reading deviates more than a few increments from zero,

the unit was unable to get a stable reading upon being powered up, and was then unable to zero upon power-up.

• Temporarily change your ﬁlter settings and/or your stability criterion for zeroing so that you can successfully zero the system with a

“Z” command (response: “Z A”).

• If necessary, restore the ﬁlter settings (Section 3.4).

4.4.2 If the weighing module does not transmit the expected weight readings

• Check the weighing module settings by using the “LST” command (list settings).

• Run testing functions with the “TST2” or “TST3” commands (see the MT-SICS reference manual). The difference sent is the adjustment

error, also called sensitivity deviation, that has developed as a result of drift or heavy use since the last adjustment. The result should give you an idea of whether adjustment is needed. Note: If the difference is in the hundreds of increments (digits), you should assume that the weighing module was handled improperly, dropped, or suffered some other shock or blow. You should have a technician check the unit before you use it again.

• Switch the power off and back on and check the message that the interface sends after the weighing module’s startup phase. If you

see an error message instead of the serial number, contact your METTLER TOLEDO ofﬁce.

4.4.3 If the weighing module doesn’t react to your commands at all

• Check to see that power is being supplied to your unit.

• Check your interfaces and interface parameter settings.

If you, or the person at your company responsible for maintaining the weighing module, cannot remedy the problem, please contact your supplier or METTLER TOLEDO representative. Be sure to have the following information ready when you contact us:

– Your weighing module’s current settings (“LST” command). – Size of preload, if you’re working with the adapter weighing pan and a custom setup for accepting objects to be weighed. – Brief description of weighing application and the error or malfunction you are experiencing.

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Maintenance and Service

5 Maintenance and Service

To ensure that your weighing module remains reliable, accurate, and functional for many years to come, the individual components must be cleaned and maintained periodically as appropriate for the intensity of use and the risk of contamination with debris.

5.1 Cleaning the weighing module

Clean the weighing pan and the load cell housing regularly with a damp cloth. The electronic unit and terminal can also be cleaned in this fashion as needed. For tougher dirt, a mild household cleaner may be used. Make sure that no liquid penetrates inside the components!

Never use cleansers containing solvents or gritty scrubbing particles. They could damage or scratch certain surfaces (this is particularly true of the terminal view window).

You can also clean the load cell using a low-pressure hand sprayer. Before using a sprayer, remove the weighing pan and seal off the weighing pan retainer with the white

plastic cover (A). Make sure that the cover locks on properly! The connector cable to the

electronic unit must be securely screwed on to ensure that the jack (B) is sealed. Under these conditions, the load cell meets IP45 requirements. After you have cleaned the load cell, dry it off with a soft cloth.

The sealing function of the plastic cover may deteriorate over time with frequent use. Check the condition of the cover before you use it. If necessary, a new cover can be ordered as a replacement part (Section 6).

5.2 Maintenance

Your weighing module is a precision instrument, and periodic maintenance is one of the basic requirements to ensure it will perform well for you for many years to come.

Maintenance intervals will depend on the duration of use and the application and ambient conditions. Maintenance must be performed by a technician trained by METTLER TOLEDO.

Ask your METTLER TOLEDO ofﬁce about service packages available – regular maintenance by an authorized service technician will ensure your weighing module remains accurate and lengthen its service life.

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Technical Data, Accessories, and Replacement Parts

6 Technical Data, Accessories, and Replacement Parts

This section includes the most important technical data for your weighing module. Accessories from METTLER TOLEDO will expand the functionality of your weighing module and open up additional applications. This section lists the currently available options and available replacement parts.

6.1 General data

Power supply

• External power supply: 11107909, HEG 42-120200-7 Primary: 100-240V, -15%/+10%, 50/60Hz, 0.5A Secondary: 12VDC +/-3%, 2A (electronically protected from overload)

Please note the detailed information about the power supply on the next page.

• Cable for power supply: Three-prong with country-speciﬁc plug

• Power feed-in at electronic unit: 12 VDC +/-3%, 5W, maximum ripple: 80mVpp Operate only with a certiﬁed power supply with a limited SELV circuit output. Pay special attention to polarity.

Protection and standards

• Overvoltage category: Class II

• Pollution level: 2

• Protection: When the plastic cover is attached and the connector cable is hooked up, the load cell achieves an IP45 rating. If you wish to use a sprayer or waterjet to clean the load cell, take appropriate measures to prevent water from building up between the base plate and the support—this could allow water to penetrate the load cell from below. Seal the gap between the support and the load cell base plate with a suitable gasket or sealing agent. When operating, the load cell is rated IP30. The electronic unit meets IP40. The PWT and SWT terminals are rated IP54.

• Safety and EMV standards: See Declaration of Conformity (provided separately)

• Application range: Use only in closed indoor spaces; DO NOT OPERATE in areas that are an explosion hazard

Ambient conditions

• Height above sea level: to 4000m

• Ambient temperature: 5-40 °C

• Relative humidity: Max. 80% at 31°C, decreasing lineraly to 50% at 40 °C, non-condensing

• Warm-up time: At least 180 minutes after the weighing module has been connected to the power supply; the weighing module can be used immediately if it is turned on from standby mode.

Materials

• Load cell housing: Component version (WXS): Polished chromium steel, X2CrNiMo17-12 (1.4404 resp. 316L), Benchtop version (WXT): Painted chromium steel

• Electronic unit housing Component version (WXS): Polished chromium steel, X2CrNiMo17-12 (1.4404 resp. 316L), Benchtop version (WXT): Painted chromium steel

• Terminal housing: Painted die-cast zinc and plastic

• Weighing pans: Chromium steel X2CrNiMo-17-13-2 and plastic

Standard Equipment See scope of delivery in Section 2.2

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Technical Data, Accessories, and Replacement Parts

Detailed information on your METTLER TOLEDO power supply unit

METTLER TOLEDO weighing modules are shipped with an external power supply. In accordance with Class II protection, it is doubleinsulated and certiﬁed. It is equipped with functional grounding to ensure electromagnetic compatibility (EMC). The ground connection has NO safety-related function. For more information on our products’ conformity, refer to the Declaration of Conformity shipped with each product or download details from www.mt.com.

For testing in accordance with Directive 2001/95/EC, the power supply and weighing module should be treated as double-insulated Class II devices.

Therefore, grounding tests are not required. It is also unnecessary to conduct a grounding test between the protective ground of the power supply and a metallic surface on the weighing module housing.

Because precision weighing modules are sensitive to electrostatic discharge, a coupling resistor (typically 10kΩ is installed between the grounding conductor (at the power supply input) and the power supply output. See the equivalent circuit diagram for placement.

This resistor is not part of the electrical safety plan; therefore, it does not need to be tested at regular intervals.

Equivalent circuit diagram:

10 kΩ coupling resistor for

electrostatic discharge

Input 100…240V AC Output 12V DC

Double Insulation

Plastic Housing

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Technical Data, Accessories, and Replacement Parts

6.2 Model-speciﬁc data

Parameters 205DU 204 Nominal

Maximum capacity nom. 220g 220g Readability nom. 0.1mg 0.1mg Maximum capacity, ﬁne range nom. 111g –– Readability, ﬁne range nom. 0.01mg ––

Measurement properties

Properties apply to environment conditions

Speciﬁcation temperature 10 ... 30 °C 10 ... 30 °C Speciﬁcation humidity 20 ... 80 %rH 20 ... 80 %rH Speciﬁcation pressure –– ––

Limit values

Repeatability (measured at) 0.1mg (200g) 0.1mg (200 g) Repeatability at low load (measured at) –– 0.07mg (10 g) Repeatability, ﬁne range (measured at) 0.04mg (100 g) –– Repeatability at low load, ﬁne range (measured at) 0.03mg (10 g) –– Linearity 0.25mg 0.3mg Eccentric load deviation as per OIML R76 (measured at) 0.3mg (100g) 0.4mg (100g) Sensitivity offset 3 x 10-6 • Rnt 4 x 10-6 • Rnt Sensitivity temperature drift

1.5 x 10-6/°C • Rnt 1.5 x 10-6/°C • Rnt

Sensitivity stability

2.5 x 10-6/a • Rnt 2.5 x 10-6/a • Rnt

Typical values

Repeatability

typ. 0.04mg + 1.2 x 10-7 • Rgr 0.05mg + 1.5 x 10-7 • Rgr

Repeatability, ﬁne range

typ. 0.025 mg + 5 x 10-8 • Rgr ––

Differential linearity deviation typ. √2 x 10

-11

g • Rnt √5 x 10

-11

g • Rnt Differential eccentric load deviation typ. 8 x 10-7 • Rnt 1 x 10-6 • Rnt Sensitivity offest

typ. 7 x 10-7 • Rnt 1 x 10-6 • Rnt

Minimum weight (according to USP) 1)

typ. 120 mg + 3.6 x 10-4 • Rgr 150mg + 4.5 x 10-4 • Rgr

Minimum weight (according to USP), ﬁne range 1)

typ. 75mg + 1.5 x 10-4 • Rgr ––

Minimum weight (@ U=1%, 2 sd)

typ. 8mg + 2.4 x 10-5 • Rgr 10mg + 3 x 10-5 • Rgr

Minimum weight (@ U=1%, 2 sd), ﬁne range 1)

typ. 5mg + 1 x 10-5 • Rgr ––

Dynamics

Settling time (see graphic below) typ. 2s 2s Settling time, ﬁne range typ. 3 s –– Interface update rate max. 23 s 23 s Interface update rate in “FastHost” mode max. 92 s 92 s Weighing time (including time for opening and closing of

standard draft shield)

5s/3 s 3s

Dimensions of load cell

Height nom. 70mm Length nom. 127mm Length nom. 206mm (WXS) / 217mm (WXT) Diameter of standard weighing pan nom. 50mm Diameter of adapter weighing pan nom. 36 mm Weight (with standard weighing pan) nom. 3.415kg (WXS) / 3.412kg (WXT)

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Technical Data, Accessories, and Replacement Parts

0.01 0.02 0.03 0.04 0.05 0.06

< 50g

< 100g

< 200g

4 digits

Settling time [s]

Repeatability [mg]

The settling time is the time between when the object to be weighed is placed on the scale and a stable signal is output – this assumes optimal ambient conditions (including appropriate draft shield) and parameter settings. This graphic shows the approximate settling time as a function of weight and the selected repeatability.

Legend:

Rgr = gross weight Rnt = net weight (of sample) sd = standard deviation a = year (annum)

Temperature range 10 ... 30 °C

Stability of sensitivity as from ﬁrst installation with FACT

The MinWeigh weight can be improved using the following measures: – Select suitable weighing parameters – Select a better location – Use smaller tare containers

Graph of settling time

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Technical Data, Accessories, and Replacement Parts

6.3 Key to types and list of available models

The type designation allows you to clearly identify your weighing module. The type designation can be found on the name plate for the load cell and the electronic unit.

The type designation always refers to the conﬁguration as originally shipped. For example, if a weighing module without a terminal has a terminal added to it later, the type designation printed on the name plate will no longer be correct. In this case, the terminal will check all weighing module components and use this information to generate a new type designation. This designation can be queried directly at the terminal or by using a software command.

List of available models

The models in the gray shaded boxes with an order number are currently available.

204 205DU

Standard SI units

(g, mg, ct)

“Non-EU” calibrated

version

“EU” calibrated

version

Standard SI units

(g, mg, ct)

“Non-EU” calibrated

version

“EU” calibrated

version

Component version

WXS

Without terminal

WXS204S/15

#11121023

WXS204SV/15

#11121323

WXS204S/A15 WXS204S/M15 WXS205SDU/15

#11121008

WXS205SDUV/15

#11121308

WXS205SDU/A15 WXS205SDU/M15

With SWT terminal

WXSS204

#11121021

WXSS204V

#11121321

WXSS204/A WXSS204/M WXSS205DU

#11121006

WXSS205DUV

#11121306

WXSS205DU/A WXSS205DU/M

Benchtop version

WXT

With SWT terminal

WXTS204

#11121026

WXTS204V

#11121326

WXTS204/A WXTS204/M WXTS205DU

#11121016

WXTS205DUV

#11121316

WXTS205DU/A WXTS205DU/M

With PWT terminal

WXTP204

#11121027

WXTP204V

#11121327

WXTP204/A WXTP204/M WXTP205DU

#11121017

WXTP205DUV

#11121317

WXTP205DU/A WXTP205DU/M

Version S: Component version T: Benchtop version

Terminal S: SWT terminal P: PWT terminal

*: Weighing module without terminal

Maximum load/readability (display increment) For example:

204: 220g / 0.1mg (4 places)

Weighing module without terminal S: WXS without terminal T: WXT without terminal

*: Weighing module with terminal

Weighing range DU: Dual-range module

*: Single range module

Special versions V: SI units only (g, mg, ct)

*: All units

Calibrated versions A: “Non-EU” calibrated version M: “EU” calibrated version

*: not legal for trade

Additional information 15: Cable length 1.5m for

versions without terminals

*: blank (blank spaces that are not used are left out of the type designation, i.e., the type designation has no spaces and no set

length).

WX /

Page 43

Technical Data, Accessories, and Replacement Parts

6.4 Dimensions

Dimensions in all of the following dimensional drawings are given in millimeters (mm).

6.4.1 WXS load cell dimensional drawing

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Technical Data, Accessories, and Replacement Parts

6.4.2 WXT load cell dimensional drawing

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Technical Data, Accessories, and Replacement Parts

6.4.3 Adapter weighing pan dimensional drawing

This thickness of the adapter weighing pan (not including the cone) is 3.5 mm (+0.2 mm / 0 mm).

6.4.4 WXS electronic unit dimensional drawing (including mounting bracket)

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Technical Data, Accessories, and Replacement Parts

6.4.5 WXT electronic unit dimensional drawing (including terminal holder)

Page 47

Technical Data, Accessories, and Replacement Parts

6.4.6 SWT terminal dimensional drawing (mounted using terminal holder)

Page 48

Technical Data, Accessories, and Replacement Parts

6.4.7 PWT terminal dimensional drawing

Page 49

Technical Data, Accessories, and Replacement Parts

6.4.8 Adapter for weighing below (optional), dimensional drawing

Weighing below adapter detail

Thread: M4 Max. penetration depth: 8 mm Max. tightening torque: 1Nm

Page 50

Technical Data, Accessories, and Replacement Parts

6.5 RS232C interface (standard interface) speciﬁcations

Interface type: Voltage interface as per EIA RS-232C/DIN 66020 (CCITT V24/V.28)

Max. cable length: 15m

Signal level: Outputs:

+5V ... +15V (RL = 3 – 7kΩ) –5V ... –15V (RL = 3 – 7kΩ)

Inputs: +3V ... 25V –3V ... 25V

Connection: D-Sub 9-pin female

Operating mode: Full-duplex

Transmission mode: asynchronous serial bit

Transmission code: ASCII Baud rates: 600, 1200, 2400, 4800, 9600, 19200, 38400

(can be selected using interface

commands)

Bits/parity: 7 Bit/Even, 7 Bit/Odd, 7 Bit/None, 8 Bit/None (can be selected using interface commands)

Stop bits: 1 stop bit Handshake: None, XON/XOFF, RTS/CTS (can be selected using interface commands) End of line: <CR><LF>, <CR>, <LF> (can be selected using interface commands)

Data

GND

Handshake

Pin 2: Transmission line for scale (TxD) Pin 3: Receiving line for scale (RxD) Pin 5: Signal ground (GND) Pin 7: Ready to send (hardware handshake) (RTS) Pin 8: Ready to receive (hardware handshake) (RTS)

38400 baud only possible with:

• Weighing module without terminal, or

• Weighing module with terminal, only via the optional RS232C interface.

6.6 Speciﬁcation for Aux connections

You can plug the “ErgoSens” from METTLER TOLEDO or an external optical sensing device into the Aux 1 and Aux 2 jacks. This allows you to perform functions such as taring, zeroing, printing, etc.

External wiring:

Connection: 3.5 mm stereo jack Electrical data: Max. voltage 12 V

Max. power 150 mA

Switching contact

Do not connect!

∅ 3.5 mm

GND

Page 51

Technical Data, Accessories, and Replacement Parts

6.7 Accessories and Replacement Parts

6.7.1 Accessories

Terminals

SWT Terminal (touchscreen, monochrome display), including 2 terminal cables (0.575 m and 2m long), including protective covering and documentation

11121057

PWT Terminal PWT (touchscreen, color display), including 2 terminal cables (0.575 m and 2m long), including protective covering and documentation

11121058

Interface options (plug-in module) and accessories

RS232C (second RS232C-interface) 11132500 LocalCAN: Connect up to 5 devices with LocalCAN connection 11132505 MiniMettler (backwards compatible with older METTLER TOLEDO devices)

11132510

PS/2: Connect commercial keyboards and barcode readers

11132520

BT (Bluetooth): For wireless control of up to 7 peripheral devices

11132530

BT (Bluetooth): Wireless connection to a BT-P42 printer, a second BT-BLD display or PC

11132535

Ethernet: For connecting to an Ethernet network 11132515 USB RS232C converter 11103691

Connecting cables

Load cell – electronic unit Connecting cable 0.5m/1.6ft

1.5m/5ft 5m/16.4ft

11121442 11121440 11121441

Terminal-electronic unit connector cable, 6-pin 0.575m/1.9ft

0.945m/3.1ft 2m/6.5ft

11132124 11132129 11132133

Miscellaneous

Weighing pan ø 85mm 00238762

Weighing below adapter (for weighing below)

Note: An authorized service technician must perform the installation

11121081

Mounting bracket for WXS electronic unit, including DIN clip and mounting

screws

11121254

Terminal holder for SWT terminal, including mounting screws. 11121255

Flexible glass draft shield with sliding door 11121071 Universal carrying case for all WXS/WXT weighing modules 11121160 Pipette calibration set with evaporation trap 11138010

1) Only with terminal

Page 52

Technical Data, Accessories, and Replacement Parts

6.7.2 Replacement parts

Load cells

WXT Load cell (benchtop version) with mounted plastic cover, standard and adapter weighing pans, documentation, and CD-ROM

WXT204T WXT204TV WXT205TDU WXT205TDUV

11121025 11121325 11121015 11121315

WXS load cell (component version) with mounted plastic cover, standard and adapter weighing pans, documentation, and CD-ROM

WXS204S WXS204SV WXS205SDU WXS205SDUV

11121020 11121320 11121005 11121305

Electronic units

WXT Electronic unit (benchtop version, white powder-coated surface), documentation

WXTE 11121204

WXS electronic unit (component version, chromium steel), documentation WXSE 11121203

Weighing pans

Standard weighing pan ø 50mm 11121257 Adapter weighing pan ø 36mm 11121256

Miscellaneous

Weighing pan retainer (with anti-displacement ﬁxture and shock protection from lateral forces)

00238836

POM Plastic cover (to cover the weighing pan retainer) 11121121 12V Power supply (without country-speciﬁc power cable) 11107909

Protective covering for the SWT terminal 11106870

Protective covering for the PWT terminal 11132570 Replacement panels for ﬂexible glass draft shield (11121071) Side panel

Top panel Sliding panel

00238441 00238443 00238910

Page 53

Appendix

7 Appendix

7.1 Conversion table for weight units

Kilogram 1 kg = 1000.0 g 1 g = 0.001 kg Milligram 1 mg = 0.001 g 1 g = 1000.0 mg Microgram 1 µg = 0.000001 g 1 g = 1000000.0 µg Carat 1 ct = 0.2 g 1 g = 5.0 ct Pound 0.45 kg = 453.59237 g 1 g ≈ 0.00220462262184878 lb

Ounce (avdp) 28.35 g = 28.349523125 g 1 g ≈ 1.000000 g Ounce (troy) 1 ozt = 31.1034768 g 1 g ≈ 0.0321507465686280 ozt Grain 1 GN = 0.06479891 g 1 g ≈ 15.432358 GN Pennyweight 1 dwt = 1.55517384 g 1 g ≈ 0.643014931372560 dwt Momme 1 mom = 3.75 g 1 g ≈ 0.266666666666667 mom Mesghal 1 msg ≈ 4.6083 g 1 g ≈ 0.217 msg Hongkong Tael 1 tlh = 37.429 g 1 g ≈ 0.0267172513291833 tlh Singapore Tael

(Malaysia)

1 tls ≈ 37.799364 g 1 g ≈ 0.0264554714621853 tls

Taiwanese Tael 1 tlt = 37.5 g 1 g ≈ 0.0266666666666667 tlt Tola 1 tola = 11.6638038 g 1 g ≈ 0.0857353241830079 tola Baht 1 baht = 15.16 g 1 g ≈ 0.0659630606860158 baht

Page 54

Appendix

7.2 SOP - Standard Operating Procedure

SOPs are a relatively small, but very important, part of a GLP review. Real-world experience conﬁrms that SOPs drafted inside the company are much more likely to be complied with than SOPs drafted by

an anonymous external source. This section contains a brief overview of the various responsibilities connected with SOPs and a checklist for drafting your own SOP.

Responsibilities related to SOPs

Testing Unit Manager orders SOPs to be drafted

approves SOPs with a date and signature

Testing Manager ensures that SOPs are submitted

approves SOPs on behalf of management

Personnel follows SOPs and other guidelines

GLP quality assurance reviews whether valid SOPs exist

checks whether those SOPs are being followed checks whether changes are documented, and how they are documented

Checklist for SOP creation

Administrative requirements Yes No

1. Use of SOP forms

2. Name of testing institution

3. Date (SOP creation date)

4. Filing ID (key plan) for SOPs

5. Page numbering (1 of n)

6. Title

7. Effective date

8. Change notice

9. Naming of positions responsible for implementation

10. Dates and signatures: a) Author b) Reviewer c) People authorized to release

11. Distribution list

Page 55

Appendix

Content of SOP Yes No

1. Introduction and objective

2. Required material

3. Description of work steps

4. Description of documentation

5. Data processing and analysis

6. Documentation and samples to be archived, etc.

7. Archiving note

7.3 Updating ﬁrmware

In the interest of its customers, METTLER TOLEDO continuously updates its internal software (ﬁrmware) for the WXS/WXT weighing modules. Inquire at your local METTLER TOLEDO ofﬁce about upgrade and update options.

7.4 Glossary

Adaptive ﬁlter A ﬁlter where damping depends on the development of the weight signal over time (cf. linear

ﬁlter).

Adjustment Trim of sensitivity with the goal of getting as close to the ideal value as possible. On WXS/WXT

weighing modules, the trim is made at two weight points – at the current zero and the value of the adjustment weight.

Available maximum capacity Maximum load that the weighing module can manage to measure when the preload is included.

Available maximum load = nominal maximum load minus preload.

Base load The load that is necessary to use the full weighing range of the weighing module once it is

switched on. Another name for dead load.

Calibration An old term (no longer considered correct) for adjustment.

The technically correct term for the determination of the deviation between the actual and measured value (see calibration factor)..

Calibration factor A term frequently used for the adjustment factor (initial adjustment)

The technically correct term for the factor by which a measured value must be multiplied to obtain the correct (actual) value.

Dead load At METTLER TOLEDO, this term is usually used to denote the base load.

In general usage, dead load may also be used to mean “preload” (including base load). Display accuracy Another term for resolution or readability. Dynamic weight A weight reading that has not met the stability criterion. A value like this is transmitted with a

status of “D” (dynamic), as in “S D 101.01234 g” (cf. stable weight value). Gross weight Weight of an object including its tank, container, or packaging. Handshake Denotes the manner in which the recipient directs data transmission via an RS232 interface to

avoid data overruns.. Hardware handshake Data ﬂow control with the aid of separate control lines whose status is controlled by the recipient.

On WXS/WXT weighing modules, these are the “CTS” (clear to send) and “RTS” (request to send)

lines. Increment Another name for readability.

Page 56

Appendix

Initial adjustment During production of the weighing module, the built-in weight is compared to a traceable

adjustment weight whose weight is known exactly using a software routine. The resulting adjustment factor is stored in the system’s permanent memory. The adjustment factor is responsible for the accuracy of the adjustment using the built-in weight. Following an adjustment by the user, this new factor replaces the factory-deﬁned adjsutment

factor and will remain in use unless the weighing module settings are reset. Initial calibration The term used at METTLER TOLEDO for initial adjustment. Linearity Deviation of a given measured value (weight value) from the ideal straight-line function between

zero load and maximum load. Linear ﬁlter A ﬁlter with a ﬁxed, deﬁned damping independent of how the weight is measured over time. Long-term stability Speciﬁes sensitivity deviation after a deﬁned period of time, such as after one year Maximum load Maximum weight that the weighing module can still barely measure (cf. overload). Net weight Weight of an object excluding its tank, container, or packaging.

Net weight = gross weight minus tare weight (see gross weight, tare weight). Overload Load that exceeds the available maximum load for the corresponding weighing module.

In the event of overload, the weighing module responds with a status of“+”, as in “S +”. Preload Load above and beyond the base load that is on the scale when the weighing module is switched

on or zeroed (see also available maximum load). Readability Another term for resolution or display accuracy. Repeatability (s) A critical factor for the accuracy of weight measurement.

The repeatability value corresponds to the statistical standard deviation “s.”

At METTLER TOLEDO, the standard deviation is calculated from ten consecutive measurements of

the same weight under the same ambient conditions.. Reproducibility Old term for repeatability.

Technically correct term for the “accuracy” with which a measurement can be repeated after time

has passed under similar ambient conditions.. Resolution Another term for readability or display accuracy.

At METTLER TOLEDO, resolution denotes the number of weight increments (points) that a

weighing sensor (scale, weighing module) can differentiate. This ﬁgure is calculated by taking the

maximum load and dividing it by readability.

For example: WXT204: A maximum load of 220 g and readability of 0.0001 g yields 2,210,000

points of resolution. Sensitivity At METTLER TOLEDO, this denotes the relationship between the actual and measured

(transmitted) weight value.

Ideally, the sensitivity of a weighing sensor (scale, weighing module) is equal to one. Sensitivity deviation Deviation of sensitivity from the ideal value (=1) (see adjustment). Sensitivity drift Deviation of sensitivity due to changes in temperature and/or the passage of time (see long-term

stability). Software handshake Data ﬂow control achieved by transmitting a “stop” or “start” control signal from the recipient to

the sender. As a rule, the signals are “Xoff” and “Xon.” Stabilization phase Phase after placement or removal of a load during which the weight reading has not yet achieved

stability. Stabilization time Time from the placement or removal of a load until the ﬁrst stable weight value is reached. Stable weight A weight reading that has met the corresponding stability criterion. Such a value is transmitted

with a status “S” (stable) (cf. dynamic weight value). Startup zero The zero point set when the weighing module is turned on; weighing values will reference this

value until the “Zero” function is used to set a new zero point, or until the scale is tared..

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Appendix

System zero point Zero point set during production at the factory for the weighing module.

If the unit settings and current ambient conditions prevent the weighing module from meeting the stability criterion for zeroing when it is turned on, the system zero will become the current zero once a stability time-out has occurred. Because the system zero is usually somewhat higher than the base load, the current weight value in this case will actually be a negative number rather than zero. You must zero with stability before you can get correct weighing results or use the adjustment and test functions.

Tare memory Weight value memory that is overwritten each time the tare function is activated and cleared at

each zeroing.

Tare weight Weight of the tank, container, or packaging.

The weight on the weighing module relative to the current zero will be considered the tare weight and stored in the tare memory.

Timeout The period of time during which the weighing value must meet the corresponding stability

criterion. If current settings and ambient conditions make this impossible, the command is cancelled and the weighing module responds with the status “I” (Impossible = the command cannot be executed right now), e.g., “S I.” ”.

Underload Load the is less than the base load.

If the load falls below this limit, such as when the weighing platter is missing, the weighing module will respond with a status of “–”, as in “Z –”.

Weighing period, weighing time

The time that elapses between the placement or removal of a weight (weight change) until a result is recorded, usually a stable weight value.

Weighing range Range where the weight to be measured must fall so that the weighing module can record it.

Range between zero and maximum load.

Zero drift Deviation of the zero point from a true zero value (0.000 g) due to temperature changes or the

passage of time.

Page 58

Index

8 Index

AC adapter 7, 18 Adapter weighing pan 14, 52 Adjustable feet 13 Adjustment 25 Ambient conditions 11, 29, 38 Anti-displacement measure 14 Aux connections 50

CD-ROM 8 Cleaner 37 Cleaning 37 Clip 12 Conﬁguring 19 Connecting cable 51 Connector cable 37 Control unit 6 Conventions 6

Dead load 14, 15 Declaration of Conformity 6 DIN standardized rail 12 Disposal 7 Documentation 8 Drafts 11, 12

Electronic unit 6, 12, 16, 52 ErgoSens 50 Extended SICS command set 21

Factory default settings 31 Fault 36 Filter damping 29 Filter settings 11 Firmware 55 Fixed ﬁlter 28

GLP 6, 54 GMP 6 Good Laboratory Practice 6 Good Manufacturing Practice 6

Hanger opening 14 Host computer 19, 24

Interface 51 Interface options 51 ISO 14001 6 ISO 9001 6

Level 13 Level bubble 13 Levelling 13 Load cell 6, 11, 16, 52 Location 11, 12, 13

Maintenance 37 Materials 38 Memory location 32 Mounting bracket 12, 51 MT-SICS 21

Name plate 42

Optional interface 20, 24 Overload protection 15

Packaging 9 Plastic cover 13, 37, 52 Power cord 18 Power supply 18, 38, 52 Power supply unit 39 Protection and standards 38 Protective covering 52

Quality assurance 6

Readability 25 Record settings 30 Reset settings 31 Restore settings 30 RS232C standard interface 19, 24

Page 59

Index

Safety 7 Scope of delivery 10 Self-test 18 Send continuous mode 29 Sensor mode 28 Service 37 Settling time 41 Site 29 SOP 6, 54 Stability criterion 26 Standard Operating Procedure 6, 54 Standards 6 Standard SICS command set 21 Standard weighing pan 13, 52 Startup 9 Sunlight 11, 12 Symbols 6

Tare function 34 Temperature ﬂuctuations 11, 12 Terminal 6, 16, 17, 51 Terminal holder 16, 51 Terminal program 24 Type designation 42

Unpacking 9 Update rate 29 User-speciﬁc settings 31 User settings 24, 30, 32

Vibrations 11 Viewing angle 17

Warming-up time 38 Weighing below 14 Weighing below adapter 14, 49, 51 Weighing pan 13 Weighing range 14 Weighing time 11

Zero set function 35

Page 60

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Page 62

To protect the future of your METTLER TOLEDO product: 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 Service programs. Thank you.

Subject to technical changes and

to changes in the accessories supplied.

Mettler-Toledo AG, Laboratory & Weighing Technologies, CH-8606 Greifensee, Switzerland Phone +41-44-944 22 11, Fax +41-44-944 30 60, Internet: http://www.mt.com

*P11780992*