The problem with portable pads is, in general, accuracy. In order to get a reasonable accuracy when weighing a vehicle with pads, it is necessary that:
* The whole vehicle is on a flat, horizontal area;
* The pads are placed on a hard and firm surface;
* If the vehicle has got adjacent axles (tandems or triplets), these must be at the same level when being weighed. For this reason, one must use rolling mats or planks for about 3 m before and after the pads.If the vehicle does not have tandem axles, then it is possible to use the pads without leveling mats.
LMI supplies two types of wheel weighing pads:
1) Heavy duty pads
Because of their height (about 100 mm), these pads are indicated mainly for two-axled vehicles. They are simply laid on the floor, even on firm ground. They can also be used with tandem-axled vehicles, provided they are placed into a pit, so that their top is level with the ground.
They can be easily transported because of their light weight. However they require a firm surface such as cement or tar. Being very thin they can be used with tandem-axled vehicles. The weighing accuracy can be improved with the use of leveling mats before and after the pads.
Both types of pads (light or heavy duty) can be used statically or dynamically (max speed 10 km/h).
The readout instrument (LS210 type) can be used with 220V AC or with 12 V DC. The printer can be incorporated inside the instrument (tally roll printer, 12 V DC), or it can be separate (dot-matrix printer or laserjet, 220 V AC)