Rice Lake BenchMark SLHE - Manual (Page 6)

2 Benchmark Series Single Point Bench Scales
1.2 10" x 10" and 12" x 12" SL Models
All seven models of the 10" x 10" and 12"x12" SL series have stainless steel covers and frame systems. All models
use a single point load cell. The 10, 20, 30, 50, and 100 lb models come standard with a potted single point load cell
that offers extra protection against water infiltration but is not designed for washdown use. The 30, 50, and 100 lb
models can also be supplied with an RL1140 stainless steel load cell. Extra load cell protection is also available in
optional stainless steel “clamshells” which enclose the load cell. See Section 5.0 for information about clamshell
installation. All load cells come with 10 feet of cable.
Overload Protection Springs
Figure 1-1. Overload Springs
The SL series scales use a sensitive 4-point, spring-plate suspension to minimize shock and overload damage
susceptible of light-capacity scales. The system uses a bolt and an overload protection spring at each of four
loading points beneath the top cover (see Figure 1-1). Each spring is set for a specific tension so that it will
compress to prevent overload damage. If a potentially damaging load is placed on a corner of the scale, the spring
at that corner compresses. When the spring compresses, the load is taken off the load cell. This eliminates the
possibility of overloading the load cell. Likewise, if a load more than 150% of total capacity is placed anywhere on
the deck, the springs will compress and remove the load from the load cell.
In addition to the overload protection spring, the SL models incorporate a load cell overload protection screw
beneath the load cell to help prevent overload damage.
To protect the load cell from being accidentally forced upward and damaged by improperly lifting the scale by the
spider, a lift up protection screw is incorporated into the design (see Figure 1-2).
Lift up Protection Screw
Overload Protection Screw
Figure 1-2. Lift up Protection Screw