Rice Lake BenchMark Series Manual

22125 Rev B
BenchMark Series
Single Point Bench Scales
Installation and Service
Manual
®

Contents
1.0 Introduction.................................................................................................................................. 1
1.1 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 10" x 10" and 12" x 12" SL Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 12", 18" and 24" Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 12" x 18" Stainless Steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.5 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5.1 10" x 10" and 12" x 12" SL Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5.2 12" x 18" Stainless Steel Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5.3 12", 18" and 24" Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.0 Installation ................................................................................................................................... 5
2.1 Leveling Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Connecting the Load Cell Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Grounding the Scale Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.0 Calibration ................................................................................................................................... 6
4.0 Troubleshooting Guide................................................................................................................. 7
5.0 Load Cell Replacement................................................................................................................ 8
5.1 10"x10" and 12"x12" SL Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 12", 18", and 24" Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.3 Load Cell Replacement Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Installing Protective Clamshells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.0 Replacement Parts .................................................................................................................... 12
6.1 10" x 10" and 12" x 12" SL and SL/HE Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.2 12" x 12" and 12" x 18" Models, Mild Steel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.3 12" x 18" Model, Stainless Steel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.4 18" x 18", 18" x 24" and 24" x 24" Models, Mild and Stainless Steel . . . . . . . . . . . . . . . . . . . . . . . 18
BenchMark Series Limited Warranty .................................................................................................... 20
For More Information ............................................................................................................................. 21
Technical training seminars are available through Rice Lake Weighing Systems.
Course descriptions and dates can be viewed at www.ricelake.com/training
or obtained by calling 715-234-9171 and asking for the training department.
© Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.
Specifications subject to change without notice.
Rice Lake Weighing Systems is an ISO 9001 registered company.
March 2013

ii Benchmark Series Installation & Service Manual
Rice Lake continually offers web-based video training on a growing selection
of product-related topics at no cost. Visit www.ricelake.com/webinars.

Introduction 1
1.0 Introduction
Congratulations on choosing a scale from the BenchMark™series, the highest-quality single-point benchtop scale
available. The following types of NTEP-approved BenchMark scales are available:
Authorized distributors and their employees can view or download this manual from the Rice Lake Weighing
Systems distributor site at: www.ricelake.com
• The light-capacity SL series featuring stainless steel construction in 10"x10" and 12"x12" platforms with
capacities from 5 lb to 100 lb.
• A mid-range model with a 12"x18" platform and a cover and frame that are constructed of stainless steel.
This model is available in capacities from 50 lb to 100 lb.
• The medium-capacity series is constructed with stainless steel covers, and mild steel—or optional stainless
steel—frame construction. This series is available in sizes from 12" x 12" up to 24" x 24" in capacities
from 30 lb to 1,000 lb. This manual covers each scale series.
One exciting feature of the BenchMark series is its ability to be converted into a checkweigher. By adding the neck
and head from a CW-80 CheckWeigher to your BenchMark scale, the features of a checkweigher are available to
you. Contact your Rice Lake Weighing Systems distributor for more information.
1.1 Sa fe ty
Safety Symbol Definitions:
Indicates a potentially hazardous situation that, if not avoided could result in death or serious
injury, and includes hazards that are exposed when guards are removed.
Indicates information about procedures that, if not observed, could result in damage to
equipment or corruption to and loss of data.
General Safety
Do not operate or work on this equipment unless you have read and understand the
instructions and warnings in this Manual. Failure to follow the instructions or heed the warnings
could result in injury or death. Contact any Rice Lake Weighing Systems dealer for replacement
manuals. Proper care is your responsibility.
Failure to heed may result in serious injury of death.
DO NOT allow minors (children) or inexperienced persons to operate this unit.
DO NOT operate without all shields and guards in place.
DO NOT jump on the scale.
DO NOT use for purposes other then weight taking.
DO NOT place fingers into slots or possible pinch points.
DO NOT use any load bearing component that is worn beyond 5% of the original dimension.
DO NOT use this product if any of the components are cracked.
DO NOT exceed the rated load limit of the unit.
DO NOT make alterations or modifications to the unit.
DO NOT remove or obscure warning labels.
Before opening the unit, ensure the power cord is disconnected from the outlet.
Keep hands, feet and loose clothing away from moving parts.
WARNING
Important
WARNING

2Benchmark Series Installation & Service Manual
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.
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).
Figure 1-2. Lift up Protection Screw
Overload Protection Springs
Lift up Protection Screw
Overload Protection Screw

Introduction 3
1.3 12", 18" and 24" Models
Larger models in the series use mild steel frames and stainless steel deck covers for light washdown with a damp
sponge. All models are available with mild steel or optional stainless steel underbody frame construction. The
standard load cell is a single point load cell. Options include a stainless steel RL1140 load cell for 12" x 12" and
12" x 18" models and protective stainless steel clamshells for all models using a single point load cell. All load
cells come with 10 feet of cabling.
Figure 1-3. 12" x 12" With Overloads
These medium-capacity bench scales provide overload protection for the load cell by positive stops located beneath
each corner of the top frame (see Figure 1-3). These stops are set at the factory for 100% of scale capacity.
Additional overload protection is provided by an overload screw beneath the load cell to help prevent shock
damage.
1.4 12" x 18" Stainless Steel
The 12" x 18" model has a stainless steel cover and underbody frame to meet USDA requirements and make it
ideal for washdown use. The 12" x 18: comes standard with a single point load cell; a stainless steel load cell is
optional for both the 50 lb and 100 lb models. Extra load cell protection is available with the optional stainless steel
"clamshell" that encloses the load cell. See Section 5.0 for information about clamshell installation. All load cells
come with 10 feet of cabling.
These medium capacity bench scales provide overload protection with positive stops located beneath each corner
of the top frame. These stops are set at the factory for 100% of scale capacity. Additional overload protection is
provided by an overload screw beneath the load cell to help prevent shock damage.
Top Frame
Overload Protection Screw
Overload Stops

4Benchmark Series Installation & Service Manual
1.5 Specifications
1.5.1 10" x 10" and 12" x 12" SL Models
Load Cell: Potted single point
(5 lb is not potted)
Potted single point, stainless steel load
cell
cell optional on 30, 50, and 100 lb
models
Rated Output: 0.91 mV/V
Maximum Overload: 200%
Overload Protection: Spring loaded spider
Cable Length: 10 ft. (3 m) – 6 wire shielded
Output Impedance (ohms): 350
Compensated
Temperature Range: -10°C/14°F to +50°C/122°F
Safe Temperature Range:-30°C/-22°F to +70°C/158°F
Dimensions/Capacities:
1.5.2 12" x 18" Stainless Steel Model
Load Cell: Potted single point
Potted single point, stainless steel load
cell
optional on 50 lb and 100 lb models
Rated Output: 0.91 mV/V
Maximum Overload: 200%
Overload Protection: 5 point, independently adjusted
Cable Length: 10 ft. (3 m) – 6 wire shielded
Output Impedance (ohms): 350
Compensated
Temperature Range: -10°C/14°F to +50°C/122°F
Safe Temperature Range:-30°C/-22°F to +70°C/158°F
Dimensions/Capacities:
1.5.3 12", 18" and 24" Models
Load Cell: 12"x12" and 12"x18":
Potted single-point
18"x18", 18"x24" and 24"x24":
Overload Protection: 5 point, independently adjusted
Cable Length: 10 ft. (3 m) – 6 wire shielded
Rated Output: 0.91 mV/V
Output Impedance: 350
Maximum Overload: 200%
Compensated
Temperature Range: -10°C/14°F to +50°C/122°F
Safe Temperature Range:-30°C/-22°F to +70°C/158°F
Dimensions/Capacities:
Size Capacity Height
10" x 10"/
254mm x 254mm
5 lb / 2.3 kg 3.15" / 80 mm
10 lb / 4.5 kg 3.15" / 80 mm
20 lb / 9.1 kg 3.15" / 80 mm
30 lb / 13.6 kg 3.15" / 80 mm
12" x 12"/
305mm x 305mm
30 lb / 15 kg 3.25" / 92 mm
50 lb / 25 kg 3.25" / 92 mm
100 lb / 50 kg 3.25" / 92 mm
Table 1-1. 10" x 10" and 12" x 12" SL Model Sizes
Size Capacity Height
12" x 18" /
305mm x 457mm
50 lb / 25 kg 4.00" / 102mm
100 lb / 50 kg 4.00" / 102mm
Table 1-2. 12" x 18" Stainless Steel Model Sizes
Size Capacity Height
12" x 12" /
305mm x 305mm
30 lb / 13.6 kg 3.62" / 92mm
50 lb / 25 kg
100 lb / 50 kg
12" x 18" /
305mm x 457mm
50 lb / 25 kg 3.62" / 92mm
100 lb / 50 kg
18" x 18" /
457mm x 457mm
50 lb / 25 kg 5.25" /
133mm
100 lb / 50 kg
150 lb / 75 kg
200 lb / 100 kg
250 lb / 125 kg
300 lb / 150 kg
500 lb / 250 kg
1000 lb / 500
kg
18" x 24" /
457mm x 610mm
50 lb / 25 kg 5.25" /
133mm
100 lb / 50 kg
150 lb / 75 kg
200 lb / 100 kg
250 lb / 125 kg
300 lb / 150 kg
500 lb / 250 kg
1000 lb / 500
kg
24" x 24" /
610mm x 610mm
100 lb / 50 kg 5.25" /
133mm
150 lb / 75 kg
200 lb / 100 kg
250 lb / 125 kg
300 lb / 150 kg
500 lb / 250 kg
1000 lb / 500
kg
Table 1-3. 12", 18, and 24" Model Sizes

Installation 5
2.0 Installation
2.1 Leveling Scale
Remove the scale from the shipping container and place it in the desired location. Lift off the deck cover and locate
the bubble level. Adjust the four corner feet until the scale is level and all feet contact the support surface so the
scale does not rock. Lock the jam nuts on the feet when the final level is correct.
2.2 Connecting the Load Cell Cable
All models come with 10 feet of color-coded load cell cable.
Do not cut this cable. The load cell is temperature-compensated for an exact cable length of 10 feet.
See your indicator manual to determine the proper load cell cable input connectors. Use the following color codes
to wire the load cell cable.
2.3 Grounding the Scale Base
Bench scales can build up a static electricity charge during weighing operations. If powerful enough, this charge
can travel through the load cell cable to the indicator. To prevent this, all bench scales should be adequately
grounded so that static charges and transient electrical surges can drain directly to ground. Recommended practice
is to connect the scale base to an AC ground circuit using at least #12 wire. All BenchMark scales have either a
grounding screw or a hole for such a grounding screw located on the bottom of the lower frame for this purpose.
Important
For 6-wire operation: For 4-wire operation:
6-Wire Color Code Function
Red - Signal
White + Signal
Green + Excitation
Black - Excitation
Blue + Sense
Brown - Sense
Yellow or Bare Shield
Table 2-1. Load Cell Wiring - 6 Wire
4-Wire Color Code Function
Red - Signal
White + Signal
Green and Blue* + Excitation
Black and Brown* - Excitation
Yellow or Bare Shield
* Connect Sense and Excitation wires together
if using 4-wire system without sense leads.
Table 2-2. Load Cell Wiring - 4 Wire

6Benchmark Series Installation & Service Manual
3.0 Calibration
It is recommended that the scale be “exercised” by loading it to near capacity 2 or 3 times before calibration to be
certain that everything is seated. To calibrate your BenchMark:
1. With no load on scale, place the indicator in its calibration mode and perform a zero calibration.
2. Place test weights on platform equal to 70%–100% of scale’s capacity. If several weights are used, they
distribute them evenly around the platform.
3. Perform a span calibration.
4. Remove the test weights and check the zero reading. If necessary, repeat the calibration process.
See the indicator manual for the specific indicator calibration procedure.