Wood’s Powr-Grip POSF1P9AC - Manual (Page 13)

Rev 11.0/12-13 11 POS-1P9AC: #35120
Load Capacity and the Vacuum Gauge
The Maximum Load Capacity is rated at a vacuum level of 16" Hg [-54 kPa] (see
SPECIFICATIONS). Vacuum higher than this level registers in the green range on the vacuum
gauge, to indicate that the product is ready to support the maximum load weight.
WARNING: Never attempt to support maximum load weight unless vacuum level
registers higher than 16" Hg [-54 kPa].
Do not use the product to support the maximum load weight while vacuum registers lower than
16" Hg [-54 kPa]; this could result in a load release and possible injury to the operator.
Note: Some forces applied to a load can increase the effective load weight and/or break the
vacuum seal between the pad and the load. While using the product to support a load, avoid
any actions that could result in the release of the load and possible injury to people.
Vacuum Level with Smooth, Nonporous Load Surfaces
When loads with clean, smooth, nonporous load surfaces are attached to the vacuum pad, the
product should be able to maintain a vacuum level in the green range on the vacuum gauge,
except when used at high elevations (see SPECIFICATIONS: Operating Elevation). If not,
perform the V
ACUUM
T
EST
(see MAINTENANCE) to determine whether there is a deficiency in the
vacuum generating system.
Vacuum Level with Rough or Porous Load Surfaces
When loads with rough or porous load surfaces are attached to the vacuum pad, the product
may not be able to maintain a vacuum level in the green range on the vacuum gauge, due to
leakage in the seal between the pad and the load surface. In such cases, the operator must
exercise special care to determine whether the product can safely support a load.
WARNING: Although pad may seal against load at lower vacuum levels, load
capacity decreases proportionally with decreasing vacuum.
Although the vacuum level may remain below 16" Hg [-54 kPa], the product should be able to
support a load provided that the load is light enough and the pad seals sufficiently .
However, be advised that the product’s load capacity is proportional to the vacuum level
attained: For example, at a vacuum level of 10" Hg [-34 kPa], the product’s load capacity is
reduced to 62.5% of maximum. Whenever the vacuum level is lower than 16" Hg [-54 kPa],
make sure that vacuum is sufficient to support the load’s weight
before using the product to
support a load . Furthermore, never attempt to support a load when the vacuum level
is lower than 10" Hg [-34 kPa] , no matter how light the load may be.