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Automatic computation of standardized exposure values |
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Accurate measurement on all kind of handheld tools, including highly
percussive tools (up to 5000 G) |
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Self contained miniature sensor without wired
connections |
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Fully compliant with the European Vibration
Directive |
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Non intrusive |
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Includes means of avoiding common measurement
errors |
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User friendly implementation and use |
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Reasonable cost |
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| Description : |
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Our innovative measurement system allows taking vibration
measurements on handheld tools thanks to autonomous sensors that
does not need to be wired during measurements.
Stored data is downloaded from the sensor(s) at the end of the
working period using a docking station connected to a PC.
Software allows automatic computation and display of workers’
exposure to hand arm vibration, and indicates how it compares with
limit and action values defined in the vibration Directive.
In order to cover the full range of existing handheld tools two
sensors have been developed: one for usual vibrating tools while
another one is dedicated to highly percussive tools exhibiting high
level of shocks. (Up to 50 000 m/s2)
Our measuring device, that can be attached to any kind of tools, is
currently the only one capable of taking accurate vibration
measurement without disturbing worker’s tasks with annoying and
fragile cabling. A special version of the sensor is specifically
dedicated to measurement on highly percussive tools.
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| Sensors
description : |
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The
sensing device is made of a miniature case to be fixed on the tool
and includes:
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a 3-axis accelerometer |
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an electronic circuit
acquiring , processing (weighting filters), and storing the
acceleration values |
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a compact battery |
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a communication
circuit to access stored values (not used during measurement) |
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an indication of
operation (LED) |
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The available range includes two
sensors looking the same and operating identically, but exhibiting
different characterics :
one allows taking measurements on most common handheld tools, while
the second one is dedicated to highly percussive tools (e.g.
rammers, rock-drills, …)
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Standard sensor
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Highly percussive tool sensor
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Measurement range
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± 2 000 m/s2
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± 50 000 m/s2
(1)
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Maximum measurement
noise
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0,10 m/s2
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0,50 m/s2
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(1)
Sensor range
(including internal mechanical filters)
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| Software for
exposure values computation |
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WindowsTM software |
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Access to measures from one
sensor or more using the supplied docking station |
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Automatic computation and
display of workers’ exposure to hand arm vibration, and comparison
with limit and action values defined in the european vibration
Directive |
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Storage and export of vibration
time history for further processing with analysis software (option) |
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| Operation : |
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The sensors are plugged in the docking station; which is connected
to the PC. These are then made ready to measure. As soon as they are
unplugged from the docking station, they can be attached to the tool(s)
within a given period of time (user parameters). At the end of the
measurement period sensors are plugged again in the docking station.
Measurements are downloaded from each sensor and worker’s exposure
to hand-arm vibration is computed, eventually taking into account
the different tools he has been using.
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| Measurement
errors avoidance : |
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Unwanted effects can lead to inaccurate results. Hand-arm vibration
is prone to measurement errors such as those generated by high
shocks encountered on percussive tools (e.g. DC Shift, …).
In order to avoid those phenomena, special provisions have been
implemented (i.e. integrated 3-axis mechanical filter). Those
provisions allows any user - being an expert in vibration or not -
to get to accurate and consistent measurement results.
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| Supply : |
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Basic configuration:
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A suitcase (4 sensors capacity) including : |
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a vibration sensor (standard
sensor or sensor for highly percussive tools); |
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sensor
fixing means |
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a docking
station (4 sensors capacity) for charging and communication between
the sensors and the software |
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a communication cable between docking station and PC (USB port) |
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a charger |
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a user
manual |
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the dose computation software on CD |
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Additional sensors : (standard sensor and sensor for
highly percussive tools) can be purchased separately and added to
the basic configuration. |
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| Compliance : |
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Fully compliant with the european vibration Directive 2002/44/EC and related standards ISO 5349-1 and 5349-2
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Compliant with the ISO 8041 : 2005 standard (Human response to vibration – Measuring instrumentation)
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Weighting filters according to ISO 5349-1
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The sensors are supplied with coupling devices for firm and stiff attachment to the tools as per ISO 5349-2
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Developed in partnership with INRS (Research Center for Safety, France)
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| Optional
analysis software : |
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Display of vibration time histories
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Different periods of use simulation
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Management of several sensors
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Reporting tools
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Measurement export (spreadsheets, text, …)
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