Rice Lake BenchMark Series User manual

BenchMark Series
Single Point Bench Scales
Technical Manual
®
January 22, 2019 22125 Rev E

An ISO 9001 registered company
© Rice Lake Weighing Systems. All rights reserved.
Rice Lake Weighing Systems® is a registered trademark of
Rice Lake Weighing Systems.
All other brand or product names within this publication are trademarks or
registered trademarks of their respective companies.
All information contained within this publication is, to the best of our knowledge, complete and
accurate at the time of publication. Rice Lake Weighing Systems reserves the right to make
changes to the technology, features, specifications and design of the equipment without notice.
The most current version of this publication, software, firmware and all other product
updates can be found on our website:
www.ricelake.com

Contents
© Rice Lake Weighing Systems ● All Rights Reserved i
Contents
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.
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 10" x 10"/ 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Leveling Scale. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Connecting the Load Cell Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Grounding the Scale Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.0 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.0 Maintenance/Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1 Load Cell Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1.1 10"x 10" and 12"x 12" SL Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1.2 12", 18", and 24" Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Installing Protective Clamshells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.0 BenchMark Series Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

BenchMark Series
ii Visit our website www.RiceLake.com
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
© Rice Lake Weighing Systems ● All Rights Reserved 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:
The BenchMark SL is a light-capacity scale featuring stainless steel construction in 10" x 10" and 12" x 12" platforms with
capacities from 2-100 lb.
A mid-range model with a 12" x 18" platform and a cover and frame that are constructed of stainless steel. This model is
available in capacities from 50-100 lb.
The medium to high capacity series is constructed with stainless steel covers and mild steel or optional stainless steel frame
construction. They are available in sizes from 12" x 12" up to 24" x 24" in capacities from 30-1000 lb.
A feature of the BenchMark series is its ability to be converted into a checkweigher. Add the neck and head from a CW-80
CheckWeigher to a BenchMark scale and the features of a checkweigher are available. Contact your Rice Lake Weighing
Systems distributor for more information.
Manuals are available for viewing and/or downloading from the Rice Lake Weighing Systems website at
www.ricelake.com/manuals
Warranty information can be found on the website at www.ricelake.com/warranties
1.1 Safety
Safety Signal Definitions:
Indicates an imminently hazardous situation that, if not avoided, will result in death or serious injury. Includes
hazards that are exposed when guards are removed.
Indicates a potentially hazardous situation that, if not avoided, could result in serious injury or death. Includes
hazards that are exposed when guards are removed.
Indicates a potentially hazardous situation that, if not avoided, could result in minor or moderate injury.
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 this manual has been read and all instructions are understood.
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.
Failure to heed could result in serious injury or 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.
DANGER
WARNING
CAUTION
IMPORTANT
WARNING

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1.2 10" x 10"/ 12" x 12" SL Models
All seven models of the 10" x 10" and 12"x 12" 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 4.2 on page 11 for information about clamshell installation. All load cells come with 10' 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
© Rice Lake Weighing Systems ● All Rights Reserved 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' of cabling.
Figure 1-3. 12" x 12" Overload Stops
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 4.2 on page 11 for information about clamshell installation. All load cells come with 10 feet of cabling.
Figure 1-4. 12” x 18” Overload Stops
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
Overload Stops Top Frame

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1.5 Specifications
1.5.1 10" x 10" and 12" x 12" SL Models
Load Cell: Potted single point (5 lb not potted);
Stainless steel load cells available on 30, 50 and 100 lb models
Rated Output: 0.91 mV/V
Maximum Overload: 200%
Overload Protection: Spring loaded spider
Cable Length: 10' (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; Stainless steel load cells available 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' (3 m) – 6 wire shielded
Output Impedance: 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:
Size Capacity Height
10" x 10"/
254 mm x 254 mm
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"/
305 mm x 305 mm
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. SL Model Sizes
Size Capacity Height
12" x 18" /
305 mm x 457 mm
50 lb / 25 kg 4.00" / 102 mm
100 lb / 50 kg 4.00" / 102 mm
Table 1-2. Stainless Steel Model Sizes

Introduction
© Rice Lake Weighing Systems ● All Rights Reserved 5
1.5.3 12", 18" and 24" Models
Load Cell: Potted single point
Available Sizes: 12"x 12", 12"x1 8", 18"x1 8", 18"x 24", 24"x 24":
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
12" x 12" /
305 mm x 305 mm
30 lb / 13.6 kg 3.62" / 92 mm
50 lb / 25 kg
100 lb / 50 kg
12" x 18" /
305 mm x 457 mm
50 lb / 25 kg 3.62" / 92 mm
100 lb / 50 kg
18" x 18" /
457 mm x 457 mm
50 lb / 25 kg 5.25" / 133 mm
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" /
457 mm x 610 mm
50 lb / 25 kg 5.25" / 133 mm
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" /
610 mm x 610 mm
100 lb / 50 kg 5.25" / 133 mm
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. Larger Capacity Model

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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 the 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.
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
IMPORTANT