Sartorius WZA225-CW User manual

Installation Instructions
Sartorius Weigh Cells
Models WZA225-CW, WZA26-CW
98648-014-15

Contents Warnings and Safety Precautions
2Warnings and Safety Precautions
3General View of the Equipment
4Installation
4 Storage and Shipping Conditions
4 Incoming Inspection
4 Equipment Supplied
4 Installation Instructions
4 Connecting the Weigh Cell to the
Electronics Module
5 Connecting the Weigh Cell to
AC Power
6 Setting up the Weigh Cell
6 Attaching a User-specific Transducer
7 Leveling the Weigh Cell
Operation
8 Notes on Analytical Weighing
9 Below-Cell Weighing
10 Configuration
11 Parameter Settings (Overview)
13 Interface Port: RS-232
16 Pin Assignment Chart
17 Cabling Diagram
18 Troubleshooting Guide
19 Overview
19 Specifications
20 Dimensions (Scale Drawings)
22 Accessories (Options)
23 Declaration of Conformity
Description
of the System
– The WZA225-CW/WZA26-CW is a
compact weigh cell that can be affixed
to a smooth surface.
– The weigh cell has a built-in calibration
weight and can be calibrated and
adjusted by transmitting a control
command, or at the press of a key using
the optional display and control unit.
– These compact weigh cells can be used
to determine weights within restricted
space.
The weigh cells have been developed
for:
– Installation in measuring devices and
production machinery
– High-precision weighing within limited
space
– Precise weight determination on active
production lines
Safety Precautions
§Once it has been installed, the weigh
cell must be checked for the following:
– Compliance with directives and stan-
dards for electrical apparatus
– Electromagnetic compatibility of the
complete weighing instrument
– Compliance with mandatory safety
regulations
§To prevent damage to the equipment,
read these installation instructions care-
fully before operating the weigh cell.
§These installation instructions describe
only the technological specifications of
the weigh cell and the conditions that
must be observed during installation.
The specific procedures to follow when
performing installation will depend
on the particular system in which the
weigh cell is installed.
!Always make sure the equipment is
disconnected from power before per-
forming any installation, maintenance
or repair work.
!Exposure to excessive electromagnetic
interference can cause the readout
value to change. Once the disturbance
has ceased, the instrument can be used
again in accordance with its intended
purpose.
!The equipment may be opened only
by authorized service technicians who
have been trained by Sartorius and who
follow Sartorius’ standard operating
procedures for maintenance and repair
work.
!Make absolutely sure to disconnect the
electronics module from power before
you connect or disconnect any elec-
tronic peripheral devices to or from the
data interfaces.
Installation Requirements
!Do not use this equipment in hazardous
areas, zones exposed to explosive gases
or dusts, nor areas exposed to poten-
tially explosive materials.
!Use of the weigh cell in areas where
medical equipment is operated is not
permitted.
!If you connect a different weigh cell or
electronics module from Sartorius, make
sure to connect devices that are made
to be operated together. Check the
equipment numbers before connecting
the devices.
!Any incoming inspection or installation
work that does not conform to the
instructions in this manual will result in
forfeiture of all claims under the manu-
facturer’s warranty.
!If you use electrical equipment in
installations and under ambient condi-
tions subject to stricter safety standards
than those described in the manual,
make sure you comply with the provi-
sions as specified in the applicable reg-
ulations for installation in your country.
!All components in the system must be
grounded (earthed), including any draft
shield added to the equipment. Connect
an equipotential bonding conductor.
!If you use electrical equipment in
installations and under ambient condi-
tions subject to stricter safety standards
than those described in the manual,
make sure you comply with the provi-
sions as specified in the applicable reg-
ulations for installation in your country.
– Warning when using pre-wired RS-232
connecting cables: RS-232 cables pur-
chased from other manufacturers often
have incorrect pin assignments for use
with Sartorius equipment. Be sure to
check the pin assignments against the
chart in these instructions before con-
necting the cable, and disconnect any
lines identified differently from those
specified by Sartorius.
– Note on installation:
The operator shall be responsible for
any modifications to Sartorius equip-
ment and for connections of cables
not supplied by Sartorius and must
check and, if necessary, correct these
modifications. On request, Sartorius will
provide information on the minimum
operating specifications (in accordance
with the standards for defined immuni-
ty to interference).
$If there is visible damage to the equip-
ment or power cord, disconnect the
equipment from power and replace the
weigh cell and electronics module.
– Do not expose the equipment to
aggressive chemical vapors or to
extreme temperatures, moisture, shocks,
or vibration.
$If you have any problems with the
equipment, contact your local Sartorius
office, dealer or service center.
Hotline
§For technical support regarding the
design, specifications or installation of
the weigh cells, contact your local
Sartorius dealer or contact the Sartorius
hotline (in Germany) at:
Phone: [phone]
Fax: [phone]
2

3
Pos. Designation
1 Load receptor
2 Shield ring
3 Weigh cell
4 Threaded bore hole (M6) for mounting the weigh cell
5 Connector (male) for electronics module
6 Level indicator
Pos. Designation
7 Bore hole for an equipotential bonding terminal
8 Electronics module
9 COM -interface for peripheral device
10 Printer interface*
11 DC jack
12 Socket for connecting the weigh cell
* = Functional only when the FF03-VF3659 indicator (optional)
is connected
General View of the Equipment
8
2
9
11
12
1
3
4
5
6
7
10

Installation
The weigh cells are available in various
versions. If you have ordered special
options, the weigh cells are equipped
with the requested features at the
factory.
Storage and Shipping Conditions
– Once the equipment has been removed
from the packaging, it may lose accura-
cy if subjected to strong vibration.
Excessively strong vibration may com-
promise the safety of the equipment.
– Do not expose the equipment unneces-
sarily to aggressive chemical vapors or
to extreme temperatures, moisture,
shocks, or vibration.
$It is a good idea to save the box and all
parts of the packaging until you have
successfully installed your equipment.
Only the original packaging provides
the best protection for shipment.
$Before packing your equipment for
shipment, unplug all connected cables
to prevent damage.
!If the equipment is to be shipped or
otherwise transported over long dis-
tances, it must be packed in the original
packaging; otherwise, Sartorius is not
liable for any damage to the equipment.
$Do not expose the equipment to
gravitational acceleration in excess of
0300 m/s2(unless additional equip-
ment is installed on the load receptor
that enables it to withstand this force).
Incoming Inspection
The customer shall inspect the product
and packaging immediately upon deliv-
ery for proper functioning, complete-
ness, and absence of defects. This is to
be performed in an incoming inspection
within 10 days of delivery of the prod-
uct. The incoming inspection must take
place before the equipment is installed.
Any obvious defects, errors, or incorrect
delivery must be reported in writing.
Defects detected at a later date must be
reported in writing immediately upon
detection.
Important note on incoming inspection:
– We recommend performing a repeata-
bility test using an auxiliary draft shield
to make sure the weigh cells were not
damaged in transport. You can use the
YAD01IS software or the optional
FF03-VF3659 display and control unit
as an aid for this test.
Equipment Supplied
– Weigh cell
– Electronics module
– Installation instructions (this document)
– Special accessories as listed on the bill
of delivery, if ordered, or in accordance
with specific arrangements
Installation Instructions
The equipment is designed to provide
reliable results under normal ambient
conditions. If you have any questions or
difficulties when developing your
weighing system, please contact the
specialists at Sartorius. When designing
and setting up your weighing system,
please observe the following so that
you will be able to work with added
speed and accuracy:
– Avoid exposing the equipment to the
effects of extremely high temperatures;
for example, caused by other electronic
components, heaters or direct sunlight.
– Protect the equipment from drafts that
come from open windows or doors.
– Maintain a constant ambient tempera-
ture when operating the equipment.
– Avoid exposing the equipment to
excessive vibrations during weighing;
for example, caused by motors or
valves.
– Protect the equipment from aggressive
chemical vapors.
– Do not expose the equipment to
extreme moisture over long periods.
!Always calibrate the weigh cell after
transport.
– Equipment installed on the load recep-
tor can interfere with weigh cell func-
tions. The operator of the equipment
accepts all liability for production
release and the overall specifications of
the equipment as connected within the
particular system. The overall specifica-
tions attained by your system may dif-
fer from the specifications listed for the
weigh cell in these instructions.
Conditioning the equipment:
Moisture in the air can condense on the
surface of a cold weighing instrument
or other device whenever it is moved to
a substantially warmer place. If you
transfer the equipment to a warmer
area, make sure to condition it for
about 2 hours at room temperature in
the new location, leaving it unplugged
from AC power.
Connecting the Weigh Cell to the
Electronics Module
– Plug the male connector on the cable
into the female connector on the elec-
tronics module. Make sure the devices
have identical serial numbers to avoid
connecting components incorrectly.
4

Connecting the Weigh Cell to AC Power
§Check the voltage rating and the plug design.
If they do not match your local rating or standard, contact your supplier.
Use only
– Genuine Sartorius AC adapters or power supplies
– AC adapters or power supplies approved by an authorized technician
§Insert the right-angle plug from the AC adapter into the jack on the electronics module.
§Connect the equipment to power:
plug the AC adapter into the wall outlet (mains)
$Power is supplied over the DC jack.
If the voltage specified on the label or the plug design of the AC adapter do not match
your local rating or standard, please contact your Sartorius office or dealer.
$Using an AC adapter other than that supplied with the equipment:
The device can be operated with a supply voltage of 12 V to max. 26 V.
!The power connection must be made in accordance with the regulations applicable in
your country.
Safety requirements for operation of the evaluation electronics connected to a safety
extra-low voltage (SELV) source:
The external power supply must meet the requirements of EN 61010-1, Section 6:
“Protection Against Shock Current.” Please also refer to the specifications for classifica-
tion of electrically operated equipment in EN 61010-1, Appendix H.
Safety Precautions
The power supply must be rated to safety extra low voltage (SELV) or grounded (earthed)
safety extra low voltage (SELV-E).
An AC adapter rated to Class 2 can be plugged into any wall outlet without taking addi-
tional safety precautions. The ground terminal is connected to the weigh cell housing.
The electronics module must be grounded for operation. The data interface is also elec-
trically connected (grounded) to the weigh cell housing.
EMC requirements:
The connector is designed for DC connections between equipment/systems that are not
connected to a DC power supply. The cable length must not exceed 3 m.
To use an external power supply, the power source must meet the requirements
of EN 61326. The following standards apply: Fast transients IEC 61000-4-4,
Surge voltage IEC61000-4-5, Conductive HF signals IEC 61000-4-6
Connecting Electronic Peripheral Devices
§Make absolutely sure to unplug the weigh cell from AC power before you connect or dis-
connect a peripheral device (display and control unit or PC) to or from the interface port.
NOTE: This equipment has been tested and found to comply with the limits pursuant to part
15 of FCC Rules. These limits are designed to provide reasonable protection against harmful
interference. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with these instructions, may cause harmful interference
to radio communications.
For information on the specific limits and class of this equipment, please refer to the Decla-
ration of Conformity. Depending on the particular class, you are either required or requested
to correct the interference.
If you have a Class A digital device, you need to comply with the FCC statement as follows:
“Operation of this equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.”
If you have a Class B digital device, please read and follow the FCC information given below:
“However, there is no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and receiver.
– Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
– Consult the dealer or an experienced radio/TV technician for help.”
Before you operate this equipment, check which FCC class (Class A or Class B) it has
according to the Declaration of Conformity included. Be sure to observe the information
in this Declaration. 5

Warmup Time
The amount of warmup time required depends in part on the system in which the weigh
cell is installed. To deliver exact results, the weigh cell must warm up for at least 4 hours
after initial connection to AC power or after a relatively long power outage.
Only after this time will the device have reached the required operating temperature.
§Position the components listed below on the weigh cell in the order given:
– Shield ring
– Load receptor
Attaching a User-specific Transducer
§Attach any user-specific transducer to the threaded fastener on the load receptor and
tighten it as indicated in the table of torque values below.
!Make sure the user-specific transducer is rigid, and is firmly attached to the
load receptor.
Maximum permissible load on load receptor:
Model Mcorner M1 M2
WZA225-X 0.5 Nm 1 Nm 0.8 Nm*
WZA26-X 0.25 Nm 0.5 Nm 0.8 Nm*
*) No weighing pan installed
The off-center load moment listed under Mcorner must not be exceeded by off-center loads,
as this may result in damage to the weigh cell.
The force “G” is made up of the weight force exerted by the sample and the off-center load
exerted on the load receptor.
The load receptor must be resistant to bending and twisting forces.
The overload protection of the weigh cell protects only against vertical overloading.
The equipment operator must take steps to prevent other overloads that may occur during
operation.
6
G
R
G = Load
R = Distance from pan center
Mcorner = G · R

Example: Maximum length of the cantilever in the WZA225-CW
A uniform cross-section of the cantilever is assumed. The weight of the cantilever
is estimated at 50 g.
Mcorner cantilever ≈1R +Gcantilever Gcantilever = 9.81 m/s2+0.05 kg
= 0.49 N
Mcorner load = R +Gload Gload = 9.81 m/s2+0.15 kg
= 1.47 N
Mcorner = Mcorner cantilever + Mcorner load
= R (1+Gcantilever + Gload)
Mcorner
R=
(1Gcantilever + Gload)
R = 0.5 Nm / 1.715 N
R = 0.29 m
7
In this example, the cantilever must not
exceed 290 mm in length, otherwise dam-
age to the system may result. Handling of
the equipment during use may exert addi-
tional moment which, must be taken into
account. Generally, we recommend testing
the cantilever with the weigh cell before
putting the equipment into operation, to
avoid unwanted feedback effects in the
control loop and to account for the effects
of drafts.
Leveling the Weigh Cell in a Portable Weighing System (Leveling Feet Optional)
Purpose:
– To compensate for uneven areas at the place of installation.
– To ensure that the weigh cell is placed in a perfectly horizontal position for consistently
reproducible weighing results.
Always level the weigh cell again any time after it has been moved to a different location.
$Leveling feet are not included with the equipment supplied. The following leveling feet
are available:
– Standard leveling foot, order number 69B20005
– Designer feet (set of four), order number 69MA0195
§Adjust the leveling feet until the air bubble is centered within the circle
on the level indicator.
Permanently Installed Weigh Cells
– Adjust the weigh cell after it has been installed in the system in its permanent location
(see next page).
The weigh cell must be leveled again any time the location or position of the weighing
system is changed.
– For optimum operation, install the weigh cell in a horizontal position.
1) Bottom plate of the weigh cell
2) Fastening frame of the system
§Fastening with M6 screws:
Connection to the threaded fasteners on the weigh cell (1) (torque: 2.5 Nm)
§Fastening with M4 screws:
Connection to the threaded fasteners of a user-specific frame (2).
1
1
2
2

Operation
Notes on Analytical Weighing
with Weigh Cells
Handling of Samples and Containers
Samples should be acclimatized to the
temperature of the weigh cell to avoid
negative effects on results, such as mea-
surement errors and fluctuations caused by
air buoyancy resulting from convection
currents across the surface of the sample.
These negative effects increase as the
volume and/or surface area of the sample
increases. For this reason, the size of the
container should be appropriate for the
sample.
Samples and containers should not be
touched by the operator’s hands, as the
hygroscopic effect of fingerprints and
the effect of the hand’s temperature can
influence the measurement results.
Samples must be applied very carefully,
whether manually (using a forceps) or
automatically (by a robot or filling system).
When designing a draft shield device, steps
must be taken to keep the resulting
increase in temperature within the weigh-
ing chamber to a minimum (e.g., using
a bypass).
Weighing Electrostatically Charged
Samples or Containers
If a sample or container is electrostatically
charged, significant errors may result dur-
ing weighing. Materials with low conduc-
tivity, such as glass, plastic or filters, are
particularly susceptible to static electricity
(resulting e.g. from friction) because the
weighing pan can discharge the static elec-
tricity only very slowly.
The result is a force action between the
charge on the sample and the permanently
installed parts of the weigh cell. This
causes the readout to fluctuate constantly.
Ionization can be applied, to make the air
around the sample conductive. This allows
the charge to be compensated through
the air, or discharged through the ground
(grounded).
Aside from purely mechanical solutions
(e.g., using a special weighing pan to
shield the system), bombarding the sample
with ions of opposing polarity to neutral-
ize the surface charge is one of the most
effective methods for eliminating static
electricity. Sartorius can provide ionization
devices for installation in weighing
systems.
The area around the weigh cell can also
contain charges that negatively affect the
accuracy of weighing results. Appropriate
steps taken in the design of a draft shield
device can counteract such effects.
8
Weighing Magnetic or
Magnetizable Samples
For technical reasons, the use of magnetiz-
able materials in the manufacture of weigh
cells is unavoidable, primarily because the
operating principle of high-resolution
weigh cells is based on compensation of
the load through magnetic forces.
When weighing magnetic or magnetizable
samples or containers, interaction between
the sample or container and certain parts
inside the weigh cell may have a distorting
effect on the weighing results.
To keep such effects to a minimum, we
recommend increasing the distance
between the sample/container and the
weighing system using a non-magnetic
material. The force is reduced quadratically
with the increase in distance.
Magnetizable or magnetized samples and
the weigh cell itself interact with magnetic
fields and magnetizable or magnetized
parts in the area surrounding the weighing
system. The system can be shielded from
external magnetic fields to some extent
using (soft magnetic) plates.
Calibration/Adjustment
Calibration/adjustment can be
performed as follows:
– Using control commands sent by the
YAD01IS configuration software from
Sartorius, installed on a computer
(see page 14 for the commands),
or
$Using an optional display and control
unit

Below-Cell Weighing
A port for a below-cell weighing hanger is located on the bottom of the weigh cell.
§Remove the cover plate: remove the screws and then remove the plate.
$Threaded fastener for hook: M3
!There is no overload stop.
§Install the special hook (not included in delivery) carefully; max. torque: 0.5 Nm
$If desired, install a shield for protection against drafts.
9

Configuration
Purpose
The weigh cell is configured at the fac-
tory. The factory settings can be adapt-
ed to individual requirements by editing
the operating menu (“Setup”).
Features
The parameters are divided into the
following groups (highest menu level):
1 Weigh cell functions
(“Weighing”)
5 Interface
6 & 7 Print in weighing mode
8 Extra functions
9 Restore factory settings
Factory Settings for Menu Parameters
The factory-set configurations are
identified by an “o” in the list below.
Customer-specific settings can be
configured on request.
Preparation
$Using the YAD01IS configuration soft-
ware from Sartorius, you can process
the operating menu parameters as
follows:
– read
– edit
– print
– save
$Operation with the optional display and
control unit:
– The menu is extended by the addition
of application programs.
– The display and control unit has a
separate processor for configuring the
settings.
!Not all of the settings remain effective
when the display and control unit has
been disconnected.
For more detailed information on
configuration of the weigh cell, please
contact Sartorius.
10
Parameter Settings (Overview)
o Factory setting
WUser-defined setting
Operating 1 Weighing 1 1 Adapt filter 1 1 1 Very stable conditions
menu 1 1 2 o Stable conditions
1 1 3 Unstable conditions
1 1 4 Very unstable conditions
1 2 Application filter 1 2 1 o Final readout
1 2 2 Filling (manual)
1 2 3 Low filtering
(computer-aided filling)
1 2 4 W/o filtering (checkweigher operation)
1 3 Stability range 1 3 1 1digit
The stability symbol 1 3 2 4digit
remains displayed 1 3 3 1 digit
when the value 1 3 4 o 2 digits
is stable within 1 3 5 4 digits
this range 1 3 6 8 digits
1 4 Stability 1 4 1 No delay
delay 1 4 2 o Short delay
1 4 3 Long delay
1 4 4 Extremely long delay
1 5 Tare function 1 5 1 Without stability
1 5 2 o After stability
1 6 Auto zero 1 6 1 o On
1 6 2 Off
1 7 through 1 15 see next page

11
Operating 1 Weighing 1 1 through 1 6 see previous page
menu 1 7 Weight unit 1 1 7 2 Grams (display: g)
1 7 4 Carats
1 7 5 Pounds
1 7 6 Ounces
1 7 7 Troy ounces
1 7 8 Hong Kong taels
1 7 9 Singapore taels
1 7 10 Taiwanese taels
1 7 11 Grains
1 7 12 Pennyweights
1 7 13 o Milligrams
1 7 14 Parts per pound
1 7 15 Chinese taels
1 7 16 Mommes
1 7 17 Austrian carats
1 7 18 Tola
1 7 19 Baht
1 7 20 Mesghal
1 8 Display/output 1 8 1 o All digits
accuracy 1 8 2 Reduced for load change
1 8 3 Index +1
1 8 4 Index +2
1 8 5 Reduced by 1 digit
1 9 Calibration/ 1 9 1 External calibration/adjustment with
adjustment, factory-set weight value
linearization 1 9 2 External calibration/adjustment with
and preload weight detection
1 9 3 External calibration/adjustment with
user-defined weights
1 9 4 o Internal calibration/adjustment
1 9 6 External linearization with
factory-set weight value
1 9 7 External linearization with
user-def. weights
1 9 8 Store preload
1 9 9 Clear preload
1 9 10 Calibration/adjustment/linearization blocked
1 10 Calibration/ 1 10 1 o Calibrate, then auto adjust
adjustment sequence 1 10 2 Calibrate; manual adjust if desired*
1 11 Zero-setting range 1 11 1 1 %/max. cap.
1 11 2 o 2 %/max. cap.
Extended zero-setting range
available on request
1 12 Initial zero 1 12 1 o 3 to 5 %/max. cap. (depending on model)
setting range 1 12 2 2 %/max. cap.
1 12 3 5 %/max. cap.
1 12 4 10 %/max. cap.
1 13 Tare/zero 1 13 1 o On
at power-on 1 13 2 Off
1 13 3 Only zero at power on
1 14 Display 1 14 1 o Normal output rate
update 1 14 2 Accelerated output rate
* = Activate the calibration function again to adjust the weigh cell, or press CF to end the calibration routine without adjusting.

12
Operating 5 Interface 5 1 Baud rate 5 1 1 150 baud
menu 5 1 2 300 baud
5 1 3 600 baud
5 1 4 o 1,200 baud
5 1 5 2,400 baud
5 1 6 4,800 baud
5 1 7 9,600 baud
5 1 8 19,200 baud
5 2 Parity 5 2 1 Mark
5 2 2 Space
5 2 3 o Odd
5 2 4 Even
5 3 Number of stop bits 5 3 1 o 1 stop bit
5 3 2 2 stop bits
5 4 Handshake mode 5 4 1 Software
5 4 2 Hardware, 2 characters
after CTS
5 4 3 o Hardware, 1 character
after CTS
5 5 Communication 5 5 1 o SBI mode (ASCII)
mode 5 5 2 XBPI mode (binary) 1)
6 Print 6 1 Manual/auto print 6 1 1 Manual without stability
6 1 2 o Manual after stability
6 1 3 Manual at stability
6 1 4 Automatic without stability
6 1 5 Automatic at stability
6 2 Stop automatic 6 2 1 Manual with print command/key
printing function 6 2 2 o Not stoppable
6 3 Time-dependent 6 3 1 o 1 display update
printing 6 3 2 2 display updates
6 3 3 5 display updates
6 3 4 10 display updates
6 3 5 20 display updates
6 3 6 50 display updates
6 3 7 100 display updates
7 Print 7 2 Line format 7 2 1 o 16 characters
of printout 7 2 2 22 characters 2)
8 Extra 8 1 Menu 8 1 1 o Parameter settings alterable
functions 8 1 2 Parameters “read only”
8 4 External switch 8 4 1 o Print
function 8 4 2 Tare
8 4 3 Function key F1
8 4 4 “Toggle” function key
8 6 Power-on mode for 8 6 1 Off/on/standby 2)
weighing platform 8 6 2 Off/on2)
8 6 3 On/standby 2)
8 6 4 o Auto on
9 Reset menu 9 1 Factory settings 9 1 1 Restore
9 1 2 o Do not restore
1) XBPI extended operating mode = additional commands for communication between weigh cell and computer. For more information,
please contact Sartorius.
2) Function available only when operating the optional display and control unit or YAD01IS software

Purpose
The weigh cell has a communication
interface for peripheral devices, such as a
computer or other device.
A printer interface is also available. The
printer interface functions only if the
optional FF03-VF3659 display and control
unit is connected.
Connecting a computer:
You can connect a computer to change,
start and monitor the functions of the
weigh cell.
Features
Type of interface: Serial interface
Operating mode: Full duplex
Standard: RS-232
Transmission rates: 150, 300, 600, 1200, 2400, 4800, 9600 and
19,200 baud
Parity: Space, odd, even
Character format: Start bit, 7-bit ASCII, parity, 1 or 2 stop bits
Handshake mode: For 2-wire interface: software (XON/XOFF)
For 4-wire interface: hardware (CTS/DTR)
Operating mode: SBI (ASCII), XBPI*
* XBPI operating mode:
9600 baud, 8 bits, odd parity, 1 stop bit.
There are a number of commands for use in communication between weigh cell
and computer.
For more information, please contact Sartorius.
Factory settings for SBI operating mode:
Transmission rate: 1200 baud (menu code 5 1 4)
Parity: Odd (menu code 5 2 3)
Stop bits: 1 stop bit (menu code 5 3 1)
Handshake mode: Hardware, 1 character
after CTS (menu code 5 4 3)
Operating mode: SBI (menu code 5 5 1)
Print manually/automatically Manually after stability (menu code 6 1 2)
Stop automatic printing: Not possible (menu code 6 2 2)
Time-dependent autoprint: After 1 display update (menu code 6 3 1)
Preparation
§See page 16 for the pin assignment chart and cabling diagram.
Data Output Format with 16 Characters
Display segments that are not activated are output as spaces. Values with no decimal point
are output without a decimal point.
The type of character that can be output depends on the character’s position:
Normal Operation
Position 1 2345678910111213141516
+DDDDDDDDD*UUUCRLF
or –......... ***
or **********
*: Space
D: Digit or letter
U: Unit symbol
CR: Carriage return
LF: Line feed
13
Interface Port: RS-232
Data Output Format
Data is output with 16 characters per line.
Example:
+ 253 pcs

Special Codes
Position 1 2345678910111213141516
******––******CRLF
or H H
or L L
or C
*: Space
– –: Final readout mode
H: Overload
H H: Overload in Checkweighing
(Function available only when operating the optional display and control unit
or the YAD01IS software)
L: Underload
L L: Underload in Checkweighing
C: Calibration/adjustment
Error code
Position 1 2345678910111213141516
***Err*###****CRLF
*: Space
# # #: Error code number
Example: Output of the weight value +1255.7 g
Position 1 2345678910111213141516
+* * *1255 .7*g**CRLF
Position 1: Plus or minus sign or space
Position 2: Space
Positions 3–10: Weight with a decimal point; leading zeros = space
Position 11: Space
Positions 12–14: Unit symbol or space
Position 15: Carriage return
Position 16: Line feed
Data Input Format
The computer connected to the interface can be used to send commands controlling
weigh cells functions.
These control commands may have different formats. Control commands consist of up
to 26 characters. Each character must be transmitted according to the settings configured
in the operating menu for data transmission.
Formats for Control Commands
Format 1: Esc ! CR LF
Format 2: Esc ! # _ CR LF
Esc: Escape !: Command character
#: Digit
_: Underline (ASCII 95)
CR: Carriage return (optional)
LF: Line feed (optional)
Max: depends on command character; i.e. parameter input beyond the maximum length
is truncated, not discarded as in the case of keypad input
Format 1 (example: ESC K)
! Meaning
K Adapt filter (ambient conditions):
very stable conditions
L Adapt filter: stable conditions
M Adapt filter: unstable conditions
N Adapt filter: very unstable conditions
O Block all keys
Q Acoustic signal (beep)
P Print
R Release (unblock) keys
S Restart
T Tare and zero
Z Internal calibration/adjustment
Format 2 (example: ESC f3_)
!# Meaning
f1_ Calibration/adjustment in
accordance with menu
code 1 9 xx
f3_ Zero
f4_ Tare without zeroing
s1_ External calibration/adjustment
s3_ Clear function [CF]
x0_ Internal calibration
x1_ Print weigh cell type
x2_ Print serial no. of weigh cell
x3_ Weigh cell software version
14

Synchronization
During data communication between
the weigh cell and a connected computer,
messages consisting of ASCII characters
are transmitted via the interface. For error-
free data communication, the parameters
for baud rate, parity, handshake mode and
character format must be the same for
both units.
You can set these parameters in the oper-
ating menu so that they match those of
the connected device. You can also define
parameters in the weigh cell to make data
output dependent on various conditions.
The conditions that can be configured are
listed in the descriptions of the application
programs.
If you do not connect a peripheral device
to the interface port, this will not generate
an error message.
Handshake
The weigh cell interface (SBI) has transmit
and receive buffers. You can define the
handshake parameter in the operating
menu (menu code 5 4 x):
– Hardware handshake (CTS/DTR)
– Software handshake (XON, XOFF)
Hardware Handshake
With a 4-wire interface, 1 more character
can be transmitted after CTS (clear-to-
send).
Software Handshake
The software handshake is controlled via
XON and XOFF. When a device is switched
on, XON must be transmitted to enable
any connected device to communicate.
When the software handshake is config-
ured in the operating menu, the hardware
handshake becomes active after the soft-
ware handshake.
The data transmission sequence is
as follows:
Weigh cell ––– byte –––> Computer
(trans- ––– byte –––> (receiving
mitting ––– byte –––> device)
device) ––– byte –––>
<––– XOFF –––
––– byte –––>
––– byte –––>
…
(Pause)
…
<––– XON –––
––– byte –––>
––– byte –––>
––– byte –––>
––– byte –––>
Transmitting device:
Once XOFF has been received, it prevents
further transmission of characters. When
XON is received, it re-enables the transmit-
ting device to send data.
Receiving device:
To prevent too many control commands
from being received at one time, XON is
not transmitted until the buffer is almost
empty.
Activating Data Output
Data output can be activated by sending
a print command or automatically, either
synchronously with the display or at
defined display update intervals (see appli-
cation program descriptions and autoprint
setting).
Data Output by Print Command
The print command can be transmitted by
sending a software command (Esc P).
Automatic Data Output
In the “auto print” operating mode, data
is output to the interface port without a
print command. You can have data output
automatically at defined display update
intervals, with or without the stability
parameter. The length of a print interval
depends on the weigh cell model and
operating mode.
If you select the auto print setting, data
is transmitted immediately as soon as you
turn on the weigh cell. In the operating
menu, you can define whether or not
automatic printing can be stopped by
pressing the “Print” key.
Faster Output Speeds
If you require measured value output at
speeds faster than 10 Hz, please contact
Sartorius for further information (see also
menu item 1 14 2 in the chapter entitled
“Configuration”).
15

Pin Assignment Chart
Female interface connector:
25-contact D-Submini (DB25S) with screw
lock hardware
Male connector used (please use connec-
tors with the same specifications):
25-pin D-Submini (DB25S) with shielded
cable clamp assembly (Amp type
826 985-1C) and fastening screws
(Amp type 164 868-1)
Pin assignments:
Pin 1: Signal ground
Pin 2: Data output (TxD)
Pin 3: Data input (RxD)
Pin 4: Signal return (TxD/RxD)
Pin 5: Clear to send (CTS)
Pin 6: Internally connected
Pin 7: Internal ground
Pin 8: Internal ground
Pin 9: Reset _ In*) Universal Control Control Control Control
Pin 10: –12 V switch output 1: output 2: output 3: output 4:
Pin 11: +12 V function “lighter” 1) “equal” 1) “heavier” 1) “set” 1)
Pin 12: Reset _ Out *)
Pin 13: + 5 V
Pin 14: Internal ground
Pin 15:
Pin 16:
Pin 17:
Pin 18:
Pin 19:
Pin 20: Data terminal ready (DTR)
Pin 21: Supply voltage ground, COM
Pin 22: Not connected
Pin 23: Not connected
Pin 24: Supply voltage input +15 to 25 V
Pin 25: +5 V
*) = Hardware restart
1) = Control output only in conjunction with the optional FF03-VF3659 display
and control unit
16

17
Cabling Diagram
For connecting a computer or other peripheral device to the weigh cell using the RS-232C/V24 protocol
and cable lengths of up to 15 m (approx. 50 ft).
Important: Do not connect any other pins in the weigh cell.
Cable type: AWG 24 specification
B
alance/scale Computer,
25-pin 25-contact
male connector female connector
TxD 2 3
R
xD 3 2
CTS 5 20
D
TR 20 5
GND 4/7 6
GND 14 7
B
alance/scale Computer,
25-pin 9-contact
male connector female connector
TxD 2 2
R
xD 3 3
CTS 5 4
D
TR 20 8
GND 4/7 6
GND 14 5

18
Troubleshooting Guide
Error codes are displayed for about 2 seconds. The program then returns automatically to the previous mode.
Display Cause Solution
No segments appear No AC power is available Check the AC power supply
Power supply not plugged in Connect power supply to the
wall outlet (mains)
HThe load exceeds the weigh cell capacity Unload the weigh cell
Lor Err 54 Load receptor is not in place Place load receptor on weigh cell / Set preload
Err 01 Data output not compatible Change the configuration in
with output format the operating menu
Err 02 Calibration/adjustment condition Calibrate only when zero is
not met, e.g., displayed
– not tared Tare the weigh cell
– load on load plate Unload the weigh cell
Err 03 Calibration/adjustment could not Allow the scale to warm
be completed within the up again and repeat the
the required time period adjustment
Very unstable conditions Adapt menu settings
Err 06 Built-in calibration weight defective Contact the Sartorius Service Center
Err 07 Function not allowed Contact your local Sartorius
Service Center for assistance in changing
configuration settings
Err 08* The load on the weigh cell is too Check whether the “Initial
heavy to zero the readout zero-setting range” is configured
Err 09* No tare possible when gross <zero Zero the weigh cell
Err 10 Tare key blocked when there is Delete the tare memory by
data in tare memory (net-total). by pressing CF (clear function)
Only one tare function can be to make the tare key
performed at a time accessible again
Err 11 Tare memory not allowed Check the value entered
Err 12 Tare memory greater than weighing Check the sample or
range or range limits container
Err 17 Internal adjustment not possible Reduce preload, change the
because preload is too heavy configuration settings, or use the
YAD01IS software to set the preload
Err 30 Interface port for printer output Contact the Sartorius Service Center
blocked
Err 235 Connecting cable not Connect the cable correctly
plugged in correctly
Cable connected to electronics Connect the equipment
module from a different weigh cell Connect the components correctly
Err 340 Operating parameters (EEPROM) Contact the Sartorius Service Center
are defective
NO WP Weighing platform defective Contact Sartorius the Service Center
Function blocked None
The weight readout Unstable ambient conditions Set up the weigh cell
changes constantly (excessive vibration or draft) in another area
at the place of installation
A foreign object is caught between Remove the foreign object
the load plate and the housing
The weight readout The weigh cell was not calibrated/adjusted Calibrate/adjust the weigh cell
is obviously wrong The weigh cell was not tared Tare before weighing
The weigh cell is not level Level the weigh cell
If any other errors occur, contact the Sartorius Service Center.
* Occurs only when operated over the SBI interface (ESC f3_)_/f4_)

19
Overview
Specifications
Standard specifications Customer-specific
modifications
Model WZA225-CW WZA26-CW
Weighing capacity g 220 20
Readability mg 0.01 0.001
Maximum preload on
pan support w/o limiting
the weighing range; average2) g 0 12.5 g necessary
Maximum preload on pan
support when using the
built-in motorized calibration weight,
average2) g 110 12.5 g
Tare range (subtractive) g 100% of the maximum capacity
Repeatability <±mg 0.03 0.003
(standard deviation) 1)
Linearity <±mg 0.15 0.02
Response time 1)s<6<6
Adaptation to ambient conditions By selection of 1 of 4 optimized filter levels
Display update (depends on
filter level selected) s 0.1 to 0.4
Operating temperature range °C 10° to 30° (50° to 86°F)
Allowable ambient
operating temperature °C 5° to 40° (41° to 104°F)
Sensitivity drift within +10 to +30 °C <±/K 1 ·10–6
External calibration weight g 50 (E2) 5 (E2)
(of at least accuracy class...)
Material:
– Weigh cell Nickel-plated aluminum (load receptor: chemically nickel-plated aluminum)
– Electronics module: Painted aluminum
Net weight, approx. kg 7.2
AC power source/ V~ Portable AC adapter, 230 V or 115 V
power supply +15% to –20% (IP20 protection), power consumption: up to 35 VA
Frequency Hz 48–60
Alternatively:
Supply voltage VDC max. 12–25
from customer’s system VDC typically 14.5
Ripple 50/60 Hz 0.5 Vpp (Voltage peak-to-peak)
Power consumption Average: 4 W (weigh cell only)
Power consumption: switch-on current Average: 6 W (weigh cell only);
with optional display and control unit: 7 W (weigh cell + display
and control unit)
Built-in interface RS-232C-S/V24-V28; 7-bit; parity: even, odd, mark, or space;
transmission rates: 150 to 19,200 baud;
1 or 2 stop bits; software/hardware handshake
1) = depends on system design
2) = for operation with greater preload setting, please send e-mail to request YAD01IS configuration software;
e-mail address: [email protected]

Overview
Dimensions (Scale Drawings)
Electronics module:
All dimensions are given in millimeters
20