Weighing In-Motion

How does Weighing In Motion work?

It is a relatively simple concept:

A dynamic weighing system involves 3 parts. The first is an accurate weighing device such as weighpads or axlepads. The output signal from these devices are then fed through the second component, a very high speed A/D converter to change the voltage signal into something that the computer can use. The third requirement is a software package on a computer that determines the weight that has crossed over the weighing sensors.

All the vehicle driver has to do is slow down to between 5 and 20 km/h and drive over the weight sensors. The computer and software do the rest, and by the time that the vehicle is off the weigh sensors, a printout is ready for him showing total weight, individual axle weight, speed, and a host of other statistics.

The order of operations for setting up and using a typical low speed weigh in motion system with our portable axle pads is as follows:

• Setup and connect the weighing hardware to the computer. (weighpads, levelling track)
• Start the Weigh in Motion software, set the weighing parameters. (weight units, pad width, sample time, etc.)
• Change the weighing mode to dynamic.
• Let the software do the rest.

Here are our recommendations for a weigh in motion computer:

• ATX single/dual CPU layout motherboard support Supports Pentium II, Pentium III processors
• Light weight aluminum chassis
• Super-durable high impact ABS plastic shell
• 105-key Win95 detachable keyboard with 12 function keys
• Add-on card stabilizer
• Drive shock-mount
• Air circulation fan with filter
• LCD Brightness control and backlight on/off switch
• LED indicator for power and HDD
• 5.25" Drive bay x 2, 3.5" Drive bay x 2, and 3.5" Hidden dive bay x 1
• 5mm impact-resistant LCD screen glass
• Four full-length slots access
• Three half-length slots access
• 300 watt ATX power supply
• Built-in stereo amplified speakers.
• Built-in pointing device
• Soft wheeled carrying case

Use your own computer:

You can either purchase the computer from Davco, or supply it yourself. If we supply the computer, we will install all of the hardware and software that you need and optimize it for your weigh in motion software.

Here are our recommendations if you wish to use your own computer:

• Pentium III, 500mhz or better processor.
• Hard Drive with at least 50MB of free space (for installation and data files)
• 64 MB RAM (128MB recommended)
• 3D AGP video card
• 1 open ISA card slot
• ISA LCIC loadcell interface card (supplied) Additional cards will require additional open slots.
• Optional: Epson TMU-295 Impact, Dot Matrix, Ticket Printer

If you supply your own computer you will have to:

• Install the LCIC loadcell interface card
• Install the calibration settings for the LCIC card (these settings are supplied)
• Install the Weigh in Motion software
• Adjust the Weigh in Motion parameters to work with your system

It is recommended that you feel comfortable working with computers, both hardware and software, to accomplish these tasks. Using the Weigh in Motion software after the installation of the components is user friendly, and easy.

You can also use a low cost weighing in motion digital indicator.

More information can be obtained by e-mailing Davco.

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Davco Weight Scales Inc.
P.O. Box 4104
Quesnel, British Columbia, Canada
V2J 3J2

Toll Free 1-877-747-8371
Phone 1-250-747-8371, Fax 1-250-747-8372

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