WPI SI-BAM21-LC User manual
WORLD
PRECISION
INSTRUMENTS
SI-BAM21-LC
KG Optical Force Transducer Amplier
Serial No._____________________
www.wpiinc.com
INSTRUCTION MANUAL
090519
SI-BAM21-LC
World Precision Instruments i
Copyright © 2019 by World Precision Instruments. All rights reserved. No part of this publication may be
reproduced or translated into any language, in any form, without prior written permission of World Precision
Instruments, Inc.
CONTENTS
ABOUT THIS MANUAL ................................................................................................................................. 1
INTRODUCTION ............................................................................................................................................ 1
Features.................................................................................................................................................... 1
How the Amplier Works...................................................................................................................... 2
Notes and Warnings .............................................................................................................................. 2
Parts List ................................................................................................................................................... 2
Unpacking................................................................................................................................................. 2
INSTRUMENT DESCRIPTION ...................................................................................................................... 3
Front Panel............................................................................................................................................... 3
Back Panel................................................................................................................................................ 4
Setup ......................................................................................................................................................... 4
OPERATING INSTRUCTIONS....................................................................................................................... 5
Calibrating the SI-BAM21-LC .............................................................................................................. 5
Making Measurements ......................................................................................................................... 8
MAINTENANCE .............................................................................................................................................. 8
ACCESSORIES................................................................................................................................................. 9
TROUBLESHOOTING .................................................................................................................................10
SPECIFICATIONS..........................................................................................................................................10
APPENDIX A: SETTING SYSTEM GAIN FACTOR.....................................................................................11
INDEX.............................................................................................................................................................13
DECLARATION OF CONFORMITY ............................................................................................................14
WARRANTY ...................................................................................................................................................15
Claims and Returns..............................................................................................................................15
Repairs ....................................................................................................................................................15
ii World Precision Instruments
SI-BAM21-LC
World Precision Instruments 1
ABOUT THIS MANUAL
The following symbols are used in this guide:
This symbol indicates a CAUTION. Cautions warn against actions that can cause
damage to equipment. Please read these carefully.
This symbol indicates a WARNING. Warnings alert you to actions that can cause
personal injury or pose a physical threat. Please read these carefully.
NOTES and TIPS contain helpful information.
Fig. 1—SI-BAM21-LC KG Optical Force Transducer Amplier
INTRODUCTION
The
SI-BAM21-LC
KG Optical Force Transducer Amplier is used in conjunction with the SI-H
Muscle Bath system and the related line of SI-Heidelberg muscle physiology products. The
SI-
BAM21-LC
powers the force transducer and outputs an analog voltage proportional to the
force applied to the force transducer. The force feedback signal can be multiplied by a factor
of 1, 2, 5 or 10 to provide better resolution for a minimal change in applied force.
NOTE
: An optional factory setting increases the multiplier by a factor of 10, allowing the
signal to be multiplied by 10, 20, 50 and 100.
Features
The
SI-BAM21-LC
is a KG optical force transducer amplier that:
• Supplies an analog output (-10VDC to +10VDC) representing the force applied to the
tissue sample.
• Delivers a DC power supply voltage to the force transducer.
2 World Precision Instruments
How the Amplier Works
In a typical setup, a muscle is held by a force transducer and suspended in a tissue bath. The
force transducer is connected to the
SI-BAM21-LC
. As the muscle contracts or releases, the
force transducer converts the force into an electrical current signal which is proportional to
the force applied to the force transducer.
Before initiating an experiment, the
SI-BAM21-LC
must rst be zeroed. This sets the baseline
for measurements to follow.
The output signal is buered and multiplied by 1, 2, 5 or 10, depending on the front panel
Gain
switch setting. The X10 setting is useful when output signals are extremely small. Finally,
the force proportional signal is sent through the output amplier circuit.
The analog output has a range of -10V to +10V that drives a data acquisition system,
multimeter or oscilloscope.
Notes and Warnings
NOTE
: This system is designed for use exclusively with the SI-H line of KG force transducers.
It is not congured for use with the SI-H MicroTweezer or other types of force transducers.
Parts List
After unpacking, verify that there is no visible damage to the instrument. Verify that all items
are included:
(1)
SI-BAM21-LC
KG Optical Force Transducer Amplier
(1) Universal input (100-120VAC to 200-240VAC) AC adapter
(1) Power cord
(1)
13661
Potentiometer Adjustment Tool
(1) Instruction Manual
Unpacking
Upon receipt of this instrument, make a thorough inspection of the contents and check
for possible damage. Missing cartons or obvious damage to cartons should be noted on
the delivery receipt before signing. Concealed damage should be reported at once to the
carrier and an inspection requested. Please read the section entitled “Claims and Returns”
on page 15 of this manual. Please contact WPI Customer Service if any parts are missing at
Returns: Do not return any goods to WPI without obtaining prior approval (RMA # required)
and instructions from WPI’s Returns Department. Goods returned (unauthorized) by collect
freight may be refused. If a return shipment is necessary, use the original container, if
possible. If the original container is not available, use a suitable substitute that is rigid and
of adequate size. Wrap the instrument in paper or plastic surrounded with at least 100mm
(four inches) of shock absorbing material. For further details, please read the section entitled
“Claims and Returns” on page 15 of this manual.
SI-BAM21-LC
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INSTRUMENT DESCRIPTION
Front Panel
The front panel of the
SI-BAM21-LC
is shown in
Fig. 2
.
Zero Button
Gain Switch
Data
Acquistion
Output
Force
Transducer
Connection
Fine Tune
Switch
Fine Tune LEDs
Zeroing LED
Gain Indicator LEDs
Gain Calibration
Potentiometer
Fig. 2—Front panel of the SI-BAM21-LC
Zero Button
–When pressed, the
SI-BAM21-LC
output comes close to zero and the
Zeroing LED
illuminates. Before any measurements are taken, the
SI-BAM21-LC
should be
zeroed to establish a baseline value for the force transducer.
Fine Tune Switch
–This toggle switch allows you to ne tune the system after zeroing. Press
and hold the toggle switch to the left if you want to raise the baseline. Or, press and hold
the toggle switch to the right to lower the baseline. If the baseline is more that 0.3V above
zero, the High LED illuminates, and if it is less than –0.3V, the Low LED illuminates. When the
baseline is within 0.3V of zero, the LEDs are o.
Gain Switch
–Under normal conditions, the
Gain
switch is set to X1. The current output
of the force transducer can be amplied by a factor of 2, 5 or 10. Press the
Gain
switch to
toggle between the gain settings. A
Gain Indicator LED
illuminates to show which gain
factor is applied. Larger gains are essential when working with extremely small forces.
Gain Calibration Potentiometer
–Adjusting this potentiometer denes the gain applied.
Use the provided potentiometer adjustment tool (WPI #
13661
) to calibrate the output
voltage scale factor to the force transducer current. See “Calibrating the
SI-BAM21-LC
” on
page 5.
Data Acquisition Output
–Connect a data acquisition system like WPI’s
Lab-Trax
to this
BNC connector to record the
SI-BAM21-LC
voltage output. For test purposes, a multi-meter
or oscilloscope may be connected using a standard BNC cable (WPI #
2851
).
Force Transducer Connection
–A SI-KG series force transducer is plugged into this DIN
connector. Align the pins, and insert the connector until it is fully seated.
Digital Interface
–This connection is reserved for future use with an anti-oscillation unit.
4 World Precision Instruments
Back Panel
The back panel of the
SI-BAM21-LC
is shown in
Fig. 3
.
Power
Switch
Power
Input
Connector
(2.5mm DC barrel)
Ground
Connector
(std. banana plug)
Fig. 3—Back panel of the SI-BAM21-LC
Power Switch
–This toggle switch turns the power o (0) and on (I).
Power Input Connector
–Plug the power cord into this connector.
Ground Connector
–Use a ground wire with standard banana plug connector in this socket
to ground the entire unit to the desired reference.
Setup
Once the instrument has been inspected and accessories accounted for, make the cable
connections for system interfaces as shown in
Fig. 4.
12V DC Power SupplyGround
Force Transducer
Data Acquisition (BNC)
Fig. 4—SI-BAM21-LC Connections
1. Connect the force transducer cable to the
Force Transducer
connection port (labeled
Transducer
) on the front of the
SI-BAM21-LC
. Align the pins and insert the connector.
2. Connect a BNC cable from the data acquisition system input to the
Output
on the front
panel of the
SI-BAM21-LC
.
SI-BAM21-LC
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3. Connect the AC power adapter to the
Power Input
(labeled
12V DC, 2.5A
) on the back
panel of the
SI-BAM21-LC
.
4. Turn the
Power
switch on the back panel on (I).
5. Allow 30 minutes warm up time for the system to stabilize with the transducer.
OPERATING INSTRUCTIONS
Calibrating the SI-BAM21-LC
Before taking measurements, the
SI-BAM21-LC
must be calibrated. Each
SI-KG
force transducers shown responds linearly within its respective measurement ranges.
Consequently, the
SI-BAM21-LC
can be calibrated using only two reference points.
Force
Transducer
Force
Range
Range
(g)
Noise
(µN)
Compliance
(nm/mN)
Resonance
Frequency
SI-KG2 0-2 N 0-200 250 150 1.3 kHz
SI-KG2B 0-0.2 N 0-20 80 590 Hz
SI-KG4 0-50 mN 0-5 15 0.5 1.2 kHz
SI-KG4A 0-20 mN 0-2 4 1 1.2 kHz
SI-KG7 0-5 mN 0-0.5 0.2 10 250 Hz
SI-KG7A 0-5 mN 0-0.5 0.4 5 500 Hz
SI-KG7B 0-10 mN 0-1.0 1 1.5 550 Hz
SI-KG20 0-0.2 N 0-20 80 590 Hz
Under ideal conditions, use a model of
SI-KG
transducer that has a full-load range that is
no more than 120% of the maximum force that is anticipated. For example, if the greatest
force to be measured is 4g, use a transducer that has a full-load range of 5g, like the
SI-KG4
transducer. To use the transducer at its full-load range, set the gain of the
SI-BAM21LC
to
X1. Higher resolutions are possible using the other gain settings (X2, X5, or X10). However,
using a gain of X10 allows only a tenth of the full-load range of the transducer to be displayed
as an output. In general, it is best to choose a gain factor that does not need to be changed
during an experiment, since each gain factor can have slight variances in its oset. If it is
necessary to switch between gain ranges during an experiment, check the osets in each of
the ranges after the calibration and before conducting the experiment. Then, use the
Oset
Adjustment
switch to set the minimum average oset between the ranges.
NOTE
: Before calibrating the
SI-KG
transducer, position the tissue mount being used on the
actuator rod of the transducer. During the calibration, place the weight on the tissue mount
at the same position where the tissue will be attached.
The basic procedure for calibrating the
SI-BAM21-LC
involves:
1. Setting a zero reference point with the force transducer un-loaded.
2. Applying a load with a known mass to the tissue mount on the transducer.
3. Choosing one of the two calibration methods that best serves the application. Use the
6 World Precision Instruments
Gain Calibration Potentiometer
to adjust the amplier’s output range to:
• Maximize the resolution for the intended measurement range. For the greatest
precision, maximize the resolution of the
SI-BAM21-LC
by calibrating the 10.0V
output of the amplier to 10-20% above the maximum expected force. For example,
if the maximum expected value is 4.0-4.5g, set the
SI-BAM21-LC
so that a 5g mass
yields a 10.0V output. The maximum expected output would then be 9.0V, with a
4.5g applied load.
• Numerically correlate the force with a voltage output. For quick visualization, you
may choose to establish a numerical correlation by calibrating the
SI-BAM21-LC
so
that a force like 5.0g generates a 5.0V output.
The following calibration procedure may be used with any
SI-KG
force transducer. For
illustration purposes, a
SI-KG4
force transducer is used in the example. Note that a 5g mass
is the maximum force that a
SI-KG4
can measure. If a gain of X10 is used with the
SI-KG4
transducer, then 0.5g, which is about 10% of the total range of the
SI-KG4
force transducer,
is the largest mass that can be used with this force sensor.
1. Connect the force transducer to the transducer input of the
SI-BAM21-LC
. Connect
the output of the
SI-BAM21-LC
to an input of a data acquisition system or a digital
multimeter. See “Setup” on page 4.
• If a multimeter is used to track the output of the amplier, set the scale of the meter
to measure DC voltages between -10.0 and +10.0VDC.
• If a computerized data acquisition system, like a LabTrax 8/16, is used to record the
output of the amplier, use the autoscale feature of the recording software to track
the changes in the output voltage as the calibration is performed.
2. Mount the force transducer on the calibration stand on the base of the
SI-MT
,
SI-MKB
or
SI-HTB
system.
NOTE
: The calibration stand holds the force transducer and its tissue mount in the
proper orientation for an accurate calibration. This angle is critical in establishing a
proper calibration ratio. When gravity pulls the mass hung on end of the tissue mount
down, the actuator rod of the transducer is pulled in the same direction as the force
created by the tissue used in the experiment. If the force is not pulling on the tissue
mount in this direction, the output signal has to be adjusted correspondingly.
Calibration
Stand
Force
Transducer
Assembly
Tissue
Mounting
Hook
Fig. 5—When the force transducer is properly mounted in the calibration stand on the muscle
tester, the force transducer is held at the same angle used when making measurements.
SI-BAM21-LC
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3. Gently slide the tissue mounting hooks up on the pin that extends from the arm of the
micrometer. Some mounting hooks require an adapter (
Fig. 6
).
If you are using one of the mounting hooks (type 1-8), which is designed for use with the
SI-KG4A
,
SI-KG4B
and
SI-KG7B
force transducers, you must rst slide the mounting
hook into the adapter (
Fig. 6
) before sliding the adapter into the pin of the micrometer
arm. When the
SI-KG2
force transducer is used with the large mounting hooks (types
9-11), no adapter is needed.
Fig. 6—The mounting hook slides into the adapter before it is installed in the micrometer assembly.
4. Set the
Gain
switch on the front panel of the
SI-BAM21-LC
to the gain (X1-X10) that is
suitable for the mass being used for the calibration of the selected transducer.
5. With no weight suspended from the transducer, press and release the
Zero
button
on the
SI-BAM21-LC
. Use the multimeter or data acquisition system to monitor the
transducer output signal from the
SI-BAM21-LC
. A reading of 0.0VDC ±50mV should
be seen. Remember that the zeroing error is larger with higher gains. Use the
Oset
Adjustment
switch to move the baseline of the recording closer to zero if a smaller
oset error is desired.
NOTE
: When the
Zero
button is pressed, the zeroing LED illuminates to indicate that
the zeroing function is processing.
6. Use the
Oset Adjustment
switch to adjust the baseline to zero. Press and hold the
toggle switch to the left, if you want to raise the baseline. Or, press and hold the toggle
switch to the right to lower the baseline. If the baseline is more than 0.3V above zero,
the
High LED
illuminates, and if it is less than –0.3V, the
Low LED
illuminates. When the
baseline is within 0.3V of zero, the LEDs are o.
NOTE
: Once the baseline is zeroed to the desired position, do not touch the
Oset
Adjustment
switch until the calibration procedure is completed.
7. From the point on the tissue mount of the transducer where the tissue will be attached,
suspend a known mass that is close to the maximum range for the amplication factor
and force transducer being used. In the example for the
SI-KG4
force transducer, a
weight less than 5.0g is used for X1 or less than 0.5g for X10.
NOTE
: Mass in grams can be converted to force in Newtons (N) by multiplying the weight
hung on the transducer by gravitational acceleration. Since force equals mass times
acceleration (F=ma), a 0.5g weight is equal to 4.9mN (0.0005kg * 9.8m/s
2
= 0.0049N).
Make sure that the mass used to calibrate the transducer amplier creates a force that
falls within the operating range of the force transducer and amplication factor you
selected.
Tissue hook to transducer or adapter
Adapter for motor or
micrometer
8 World Precision Instruments
8. After the suspended mass becomes motionless, monitor the output of the amplier
while adjusting the
Gain Calibration
potentiometer on the
SI-BAM21-LC
. Use a
potentiometer adjustment tool to adjust the
Gain Calibration
potentiometer to any
desired value up to the limit of 10.0V.
9. If you intend to use multiple amplication factors, cross-check your calibration. For
example, if a 0.5g mass was used to calibrate the
SI-BAM21-LC
as close as possible to
10.0V at a gain of X10, then at a gain of X1, the monitor should display an output very
close to 1.0V for the same 0.5g calibration mass.
Making Measurements
After the
SI-BAM21-LC
has been calibrated, measurements may be taken.
1. Turn the
SI-BAM21-LC
Power
switch on (I).
NOTE
: Allow the system to stabilize for about 30 minutes. This allows all the
components to reach thermal equilibrium, minimizing measurement changes due to
thermal variations.
2. Turn on the data acquisition system.
3. Press the
Zero
button to set the baseline value for the measurements.
NOTE
: When the
Zero
button is pressed, the zeroing LED illuminates to indicate that it
is functioning properly.
4. Measurements may be taken.
MAINTENANCE
The
SI-BAM21-LC
is maintenance free. However, to protect your
SI-BAM21-LC
, follow these
guidelines:
• Place the
SI-BAM21-LC
in a clean, dry location.
• Use only a 12V DC, 2.5A power supply.
• Keep liquids away from the
SI-BAM21-LC
connections.
SI-BAM21-LC
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ACCESSORIES
Part Number Description
13661 Potentiometer Adjustment Tool (Tweaker)
2851 BNC Cable
801513 Universal Input Power Supply AC Adapter
SI-KG2 0-2N Force Transducer
SI-KG2B 0-0.2 N Force Transducer
SI-KG4 0-50mN Force Transducer
SI-KG4A 0-20mN Force Transducer
SI-KG7 0-5mN Force Transducer
SI-KG7A 0-5mN Force Transducer
SI-KG7B 0-10mN Force Transducer
SI-KG-MOUNT 0.25” Rod Mount
LAB-TRAX-4 4-Channel Data Acquisition System
Force Transducer mount pictured on the left;
Motor/micrometer mount pictured on the right.
SI-TM1 SI-TM4
SI-TM
9
SI-TM
7
SI-TM
10
SI-TM
11
1. papillary muscle
2. general purpose
4. trabeculae
5. papillary muscle
6. muscle rings
8. muscle rings
7. small skeletal
9. strong skeletal muscle
10. strong skeletal muscle
11. very strong skeletal
muscle
12. SI-OPT system
SI-TM2
SI-TM8
SI-TM6
SI-TM5
3. small skeletal muscle
SI-TM3
SI-TM12
Fig. 7—Mounting hooks can be used in a variety of combinations, depending on the type of tissue
to be examined.
10 World Precision Instruments
TROUBLESHOOTING
Issue Possible Cause Solution
No output Signal
(0.0V DC)
Poor force transducer connec-
tion
Verify that the cables are securely con-
nected.
BNC cable is bad Try substituting a dierent BNC cable to
troubleshoot the cause.
Transducer failed Try substituting a dierent force trans-
ducer to troubleshoot the cause.
Exces-
sive
Noise
Lack of ground Use the rear ground (banana) connection
to connect to a quality ground.
Drift
Insucient warm up time Allow at least 30 minutes for the SI-
BAM21-LC and the KG force transducer
to warm up before running tests.
Temperature variations Try to keep the room or environmental
temperature stable.
NOTE
: If you have a problem/issue with that falls outside the denitions of this
troubleshooting section, contact the WPI Technical Support team at 941.371.1003 or
SPECIFICATIONS
The
SI-BAM21-LC
conforms to the following specications:
Input Conguration Current to voltage converter
Gain 1X, 2X, 5X, 10X - Switch slectable
Output Impedance 470 Ohm
Power Requirements 12V DC at 2.5A (wall adaptor included–
WPI #801513), 2.5mm DC barrel
Output Range ±10V DC
SI-BAM21-LC
World Precision Instruments 11
APPENDIX A: SETTING SYSTEM GAIN FACTOR
The
SI-BAM21-LC
gain multiplier setting is selected with an internal jumper that is
congured at the factory for use with the muscle tester system of your choice (
SI-MT
,
SI-
MKB
,
SI-HTB
). The
X1
setting (
SI-MT/SI-HTB)
allows for 1X, 2X, 5X and 10X gains. The
X10
setting (
SI-MKB)
allows for 10X, 20X, 50X and 100X gains that may be needed when recording
passive tension or small muscle contractions.
1. Turn o the
SI-BAM21-LC
and unplug it from the power outlet.
2. Remove the four screws on the lid of the
SI-BAM21-LC
unit.
Screws
Fig. 8—The screws are identied on the top of the box.
3. Remove the lid from the amplier.
Fig. 9—If you tip the box upside down, the back end of the lid opens and you can slide it o the box.
4. Locate the 3-pin jumper J16. Jumper pins 1 and 2 to use the
SI-BAM21-LC
with the
X1
gain multiplier, or jumper pins 2 and 3 for use with the
X10
gain multiplier.
5. Reinstall the lid on the unit and secure it with the screws.
12 World Precision Instruments
SI-BAM21-LC
World Precision Instruments 13
INDEX
A
AC adapter 2
B
back panel 4
banana plug 4
C
calibration potentiometer 3
F
force transducer 2, 3, 4, 10
front panel 3
G
ground 4
M
maintenance 8
measurements 8
MicroTweezer 2
O
output 3, 4
P
parts list 2
power 4
R
returns 2
S
specications 10
T
troubleshooting 10
tweaker 9
U
unpacking 2
Z
zero switch 3
14 World Precision Instruments
DECLARATION OF CONFORMITY
SI-BAM21-LC
World Precision Instruments 15
* Electrodes, batteries and other consumable parts are warranted for 30 days only from the date on which
the customer receives these items.
WARRANTY
WPI (World Precision Instruments) warrants to the original purchaser that this equipment, including its
components and parts, shall be free from defects in material and workmanship for a period of one year* from
the date of receipt. WPI’s obligation under this warranty shall be limited to repair or replacement, at WPI’s option,
of the equipment or defective components or parts upon receipt thereof f.o.b. WPI, Sarasota, Florida U.S.A.
Return of a repaired instrument shall be f.o.b. Sarasota.
The above warranty is contingent upon normal usage and does not cover products which have been modied
without WPI’s approval or which have been subjected to unusual physical or electrical stress or on which the
original identication marks have been removed or altered. The above warranty will not apply if adjustment,
repair or parts replacement is required because of accident, neglect, misuse, failure of electric power, air
conditioning, humidity control, or causes other than normal and ordinary usage.
To the extent that any of its equipment is furnished by a manufacturer other than WPI, the foregoing warranty
shall be applicable only to the extent of the warranty furnished by such other manufacturer. This warranty will
not apply to appearance terms, such as knobs, handles, dials or the like.
WPI makes no warranty of any kind, express or implied or statutory, including without limitation any warranties
of merchantability and/or tness for a particular purpose. WPI shall not be liable for any damages, whether
direct, indirect, special or consequential arising from a failure of this product to operate in the manner desired
by the user. WPI shall not be liable for any damage to data or property that may be caused directly or indirectly
by use of this product.
Claims and Returns
Inspect all shipments upon receipt. Missing cartons or obvious damage to cartons should be noted on the
delivery receipt before signing. Concealed loss or damage should be reported at once to the carrier and
an inspection requested. All claims for shortage or damage must be made within ten (10) days after receipt
of shipment. Claims for lost shipments must be made within thirty (30) days of receipt of invoice or other
notication of shipment. Please save damaged or pilfered cartons until claim is settled. In some instances,
photographic documentation may be required. Some items are time-sensitive; WPI assumes no extended
warranty or any liability for use beyond the date specied on the container
Do not return any goods to us without obtaining prior approval and instructions from our Returns Department.
Goods returned (unauthorized) by collect freight may be refused. Goods accepted for restocking will be
exchanged or credited to your WPI account. Goods returned which were ordered by customers in error are
subject to a 25% restocking charge. Equipment which was built as a special order cannot be returned.
Repairs
Contact our Customer Service Department for assistance in the repair of apparatus. Do not return goods
until instructions have been received. Returned items must be securely packed to prevent further damage in
transit. The Customer is responsible for paying shipping expenses, including adequate insurance on all items
returned for repairs. Identication of the item(s) by model number, name, as well as complete description of the
diculties experienced should be written on the repair purchase order and on a tag attached to the item.
USA
175 Sarasota Center Blvd., Sarasota FL 34240-9258
UK
1 Hunting Gate, Hitchin, Hertfordshire SG4 0TJ
Tel: 44 (0)1462 424700 • Fax: 44 (0)1462 424701 • E-mail: [email protected]
Germany
Pngstweide 16, D-61169 Friedberg (Hessen), Germany
China & Hong Kong
WPI Shanghai Trading Co., Ltd.
Rm 18A, No8 Dongfang Rd., Pudong District, Shanghai, 200120 PR China
Brazil
Av. Conselheiro Nébias, 756 sala 2611, Santos-CEP: 11045-002, São Paulo Brazil Tel: (013) 406-
29703 • E-mail: [email protected]
Internet
www.wpiinc.com • www.wpi-europe.com • www.wpiinc.net • www.wpibrasil.com.br
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