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.

Troubleshooting Guide 7
4.0 Troubleshooting Guide
Use the following troubleshooting tips for the Benchmark scale if necessary.
Symptom Probable Cause Remedy
No display Power disconnected Connect power
Cable cut or disconnected Repair cable
Signal leads incorrectly wired at indicator Connect according to the manual
Display starts at zero Incorrect load cell cable connections Connect according to the manual
Faulty indicator Service indicator
Erratic Weight display Vibration near the scale Remove the source of the vibration, or adjust
digital averaging of indicator to minimize erratic
display
Scale not level Level the scale
Water damage to the load cell or cable Replace the load cell
Faulty indicator Service the indicator
Loose load cell screws Tighten to correct torque
Faulty load cell Test and replace if necessary
Consistently low weight Indicator not properly adjusted to zero Zero indicator correctly
Scale deck cover binding Obtain adequate clearance
Overload stops set too high Reset the stops correctly
Indicator not calibrated for scale Calibrate the scale
Faulty load cell Test and replace if necessary
Table 4-1. Benchmark Troubleshooting Table

8Benchmark Series Installation & Service Manual
5.0 Load Cell Replacement
5.1 10"x10" and 12"x12" SL Models
1. Unplug AC power from indicator and disconnect load cell cable from indicator.
2. Lift off scale top cover.
3. Locate two upper load cell screws. Use 7/16" wrench to unscrew and remove those two load cell screws.
Do not remove four spring-loaded screws that attach load plate to spider assembly.
4. Lift off load plate/spider assembly as a unit.
5. Remove spacer between load plate and load cell and set it aside.
Figure 5-1. Load Cell Mount Diagram
6. Turn scale over and back off overload protection screw one complete turn. Completely unscrew and
remove lift up protection screw.
7. Use 7/16" wrench to unscrew and remove two lower load cell screws. The load cell and cable can now be
removed from scale. Do not lose shim beneath load cell.
8. Thread cable of replacement load cell through rubber grommet. Position load cell on shim and screw in
two lower load cell screws. Torque to 80 in-lb.
9. Replace lift up protection screw by screwing it in until it lightly bottoms, then back it off 1/4 turn.
10. Turn scale right side up. Position spacer on load cell, then place load plate/spider assembly into position.
Screw in two upper load cell screws. Torque to 80 in-lb.
11. Using an accurate caliper, check compressed spring length on four overload springs (Figure 5-2). If
necessary, adjust spring length to specifications shown in Table 5-1. Replace top cover and re-level scale if
necessary.
12. Connect load cell cable to indicator.
13. Recalibrate scale as described in Section 3.0.
14. Adjust overload protection screw on bottom of scale by loading scale to 125% capacity. Place this weight
on top cover, centered on platform. Use a hex wrench to screw in overload protection screw until it touches
load cell, then back off 1/6 turn. Recheck calibration.
Important
Lift up
Protection
Screw
Overload
Protection
Screw
Load Cell Screw
Load Cell Screw Top Sub-Assembly
Load Plate / Spider
Top Cover
Scale Model Spring Length "H"
10 x 10 - 5 Lb 1.06
10 x 10 - 10 Lb .94
10 x 10 - 20 Lb .97
10 x 10 - 30 Lb 1.43
12 x 12 - 30 Lb 1.43
12 x 12 - 50 Lb 1.12
12 x 12 - 100 Lb 1.16
Table 5-1. Overload Spring Length
H ±.02
Figure 5-2. Spring Height

Load Cell Replacement 9
5.2 12", 18", and 24" Models
1. Unplug AC power from indicator and disconnect load cell cable from indicator.
2. Lift off scale top cover. Locate upper load cell screws. Depending on model of scale, there will be either
two or four upper load cell screws. Unscrew and remove those load cell screws. Lift off top spider.
Remove spacer plate and set it aside.
Figure 5-2. 12" x 12" Load Cell Mount
3. Loosen four overload stop screws and turn each screw in one turn to provide ample clearance for the new
load cell. Turn scale over and back off overload protection screw one complete turn to provide clearance.
4. Unscrew and remove lower load cell screws. Depending on model of scale, there will be either two or four
lower load cell screws.
5. Remove bottom shim beneath load cell and set it aside.
6. Remove load cell and cable from scale.
7. Thread cable of replacement load cell through rubber grommet.
8. Position bottom shim directly beneath load cell and screw in lower load cell screws. Torque to 80 in-lbs for
12" x 12" and 12" x 18" scales, to 120 in-lb for 18" x 18", 18" x 24", and 24" x 24" scales.
9. Turn scale right side up. Position spacer plate on load cell, then place top spider into position.
10. Screw in four upper load cell screws. Torque to 80 in-lbs for 12" x 12" and 12" x 18" scales, to 120 in-lb
for 18" x 18", 18" x 24", and 24" x 24" scales.
11. Connect load cell cable to indicator.
12. Recalibrate scale as described in Section 3.0 of this manual.
13. Adjust overload protection screw on bottom of scale by loading scale to 125% capacity. Place this weight
on top cover, centered on platform. Use a hex wrench to screw in overload protection screw until it touches
the load cell, then back off 1/6 turn. Recheck calibration.
14. To reset corner overload stop screws, load top spider over one corner with approximately 30% of scale
capacity. Adjust screw under that corner to just touch top frame. Place a drop of a non-permanent,
high-strength locking compound such as LOCTITE®on the thread. Back screw off slightly so it is not
touching.
Overload Stop
Screws
Overload
Protection Screw
Load Cell Screws
Load Cell
Screws
Load Plate
Top Frame
LOCTITE is a registered trademark of the Loctite Corporation

10 Benchmark Series Installation & Service Manual
5.3 Load Cell Replacement Table
The following table illustrates the load cell replacement numbers used with the Benchmark scales.
SL Series
Deck Size Capacity Load Cell P/N
10 x 10 2 lb Load Cell, RL1042-3 kg 40956
10 x 10 5 lb Load Cell, RL1042-5 kg 40957
10 x 10 10 lb Load Cell, RL-SP4-10 kg 91726
10 x 10 20 lb Load Cell, RL-SP4-20 kg 91728
10 x 10 30 lb Load Cell, RL-SP4-30 kg 91729
12 x 12 30 lb Load Cell, RL-SP4-30 kg 91729
12 x 12 50 lb Load Cell, RL-SP4-50 kg 91730
12 x 12 100 lb Load Cell, RL-SP4-100 kg 91732
SL/HE Series
10 x 10 5 or 10 lb Load Cell, RLPC6-10 kg 87027
10 x 10 / 12 x 12 20 or 30 lb Load Cell, RLPC6-20 kg 87028
12 x 12 50 lb Load Cell, RLPC6-50 kg 87029
12 x 12 100 lb Load Cell, RLPC6-100 kg 87030
Mild Steel/Stainless Steel
12 x 12 30 lb Load Cell, RL-SP4-30 kg (Mild Steel Only) 91729
12 x 12, 12 x 18 50 lb Load Cell, RL-SP4-50 kg 91730
12 x 12, 12 x 18 100 lb Load Cell, RL-SP4-100 kg 91732
18 x 18, 18 x 24 50 lb Load Cell, RLPMW16 50 kg 91684
18 x 18, 18 x 24, 24 x 24 100 lb Load Cell, RLPMW16 100 kg 91687
18 x 18, 18 x 24, 24 x 24 150 lb Load Cell, RLPMW16 150 kg 91688
18 x 18, 18 x 24, 24 x 24 200 lb Load Cell, RLPMW16 200 kg 91689
18 x 18, 18 x 24, 24 x 24 250 lb Load Cell, RLPMW16 250 kg 91690
18 x 18, 18 x 24, 24 x 24 300 lb Load Cell, RLPMW16 300 kg 91691
18 x 18, 18 x 24, 24 x 24 500 lb Load Cell, RLPMW16 500 kg 91692
18 x 18, 18 x 24, 24 x 24 1000 lb Load Cell, RLPMW12 1000 kg 91683
Mild Steel/Stainless Steel, Potted
18 x 18, 18 x 24 50 lb Load Cell, RL1250-N5 50 kg 32849
18 x 18, 18 x 24, 24 x 24 100 lb Load Cell, RL1250-N5 100 kg 32855
18 x 18, 18 x 24, 24 x 24 150 lb Load Cell, RL1250-N5 150 kg 32854
18 x 18, 18 x 24, 24 x 24 200 lb Load Cell, RL1250-N5 200 kg 32853
18 x 18, 18 x 24, 24 x 24 250 lb Load Cell, RL1250-N5 250 kg 32852
18 x 18, 18 x 24, 24 x 24 300 lb Load Cell, RL1250-N5 300 kg 32851
18 x 18, 18 x 24, 24 x 24 500 lb Load Cell, RL1250-N5 500 kg 32850
HE Series
12 x 18, 18 x 18, 18 x 24 50 lb Load Cell, RLPC-6 50 kg 87029
12 x 18, 18 x 18, 18 x 24, 24 x 24 100 or 150 lb Load Cell, RLPC-6 100 kg 87030
18 x 18, 18 x 24, 24 x 24 200 lb Load Cell, RLPC-6 200 kg 87031
18 x 18, 18 x 24, 24 x 24 250 or 300 lb Load Cell, RLPCBC-60 250 kg 87024
18 x 18, 18 x 24, 24 x 24 500 lb Load Cell, RLPCBC-60 500 kg 87025
18 x 18, 18 x 24, 24 x 24 1000 lb Load Cell, RLPCBC-60 1000 kg 87026
Table 5-2. Load Cell Replacement Parts

Load Cell Replacement 11
5.4 Installing Protective Clamshells
Stainless steel enclosures called clamshells are available to provide extra protection for the load cell of every
BenchMark scale. All clamshells are pre-drilled for load cell screws, overload screws, and cables. Any existing
load cell shims or spacers are installed inside the clamshells.
1. The lower clamshell fits inside the upper clamshell and is installed first. Position the clamshell so that no
part of it touches the load cell, then tighten the lower load cell screws to the specifications given
Section 5.1 or Section 5.2.
When installing the upper clam shell, position it so there is clearance on all sides to prevent any binding
problems with the lower clam shell.
2. Tighten the upper load cell screws to the required torque.
3. When installation is complete, reset all overload protection screws as described in Section 5.1 or
Section 5.2.
4. Calibrate the scale according to the procedure described in Section 3.0.
Figure 5-3. Clamshell Enclosure
Important
UPPER
CLAM SHELL LOWER
CLAM
SHELL

12 Benchmark Series Installation & Service Manual
6.0 Replacement Parts
6.1 10" x 10" and 12" x 12" SL and SL/HE Series
Figure 6-1. 10 x 10 and 12 x 12 SL and SL/HE Parts Illustration
Section BB (Enlarged)
Top View of Scale
with cover
18 19 20
21
23
22
26
27
24
25
2
3
4
5
7
8
910 11 13
14
15
16
17
A
A
B
B
12
Section AA (Enlarged)

Replacement Parts 13
Item Part No. Description Qty.
214920 Screw, Overload Protection, 8 -32UNC x 1/4, SS 1
335128 Foot, 1/4 - 20 NC x 1 3/16 SS 4
414645 Jam Nut, Foot 1/4 - 20, SS 4
519086 Bottom Subassembly, (2 lb – 30 lb, 10 in x 10 in) 1
35066 Bottom Subassembly, (30 lb – 100 lb, 12 in x 12 in) 1
752342 Label, Bench Scale 1
819091 Cover, Top, 10 x 10 SS 1
35069 Cover, Top, 12 x 12 SS 1
919088 Spider, Top, 10 x 10 1
35068 Spider, Top, 12 x 12 1
10 15148 Lockwasher 1/4 SS 4
11 21948 Screw, Load Cell, 1/4 - 20 x 5/8 SS 4
12 15410 Bubble Level, Plastic, 15 mm 1
13 Load cell (see Table 5-2) 1
14 15132 Lockwasher, #8, SS 1
15 14857 Pan Head Screw, 8 - 32 x 1/4 SS 1
16 15408 Rubber Grommet, 3/16 ID x 1/2 OD 1
17 16141 Cable Tie, 8" 1
18 14984 Cap screw (2 lb-20 lb models) 4
21947 Cap screw (30 lb model) 4
35199 Cap screw (50 lb-100 lb models) 4
19 15412 Spring, overload (2 lb model) 4
21945 Spring, overload (5 lb model) 4
15416 Spring, overload (10 lb model) 4
21946 Spring, overload (20 lb model) 4
21944 Spring, overload (30 lb model) 4
35086 Spring, overload (50 lb model) 4
35200 Spring, overload (100 lb model) 4
20 15149 Flat Washer, 1/4 type A, SS 4
21 14634 Nut, Nylon Insert, 1/4-20, SS 4
22 19089 Load Cell Shim, SS 1
23 15409 Plastic Wire Clamp 1
24 19090 Load Plate, (2 lb – 30 lb, 10 in x 10 in) 1
35067 Load Plate, (30 lb – 100 lb, 12 in x 12 in) 1
25 15150 Washer, Rubber 4
26 15138 Washer, #8, SS 1
27 14862 Screw, 8 - 32 x 3/8 SS 1
Table 6-1. 10 x 10 and 12 x 12 SL and SL/HE Parts List

14 Benchmark Series Installation & Service Manual
6.2 12" x 12" and 12" x 18" Models, Mild Steel
Figure 6-2. 12" x 12" and 12" x 18" Mild Steel Parts Illustration
Top View of 12" Scale Series with cover
removed to show location of rubber pads
13
14
12
11
9
10
8
7
6
4
32
119
10
917
16
15
Section AA (Enlarged)
20
AA

Replacement Parts 15
Item Part No. Description Qty.
135128 Foot, 1/4-20 NC x 1 3/16 4
214645 Jam Nut, Foot 4
332993 Frame, Bottom, 12"X 12"1
32992 Frame, Bottom, 12"X 18"1
452342 Label, Bench Scale 1
614739 Bolt, Overload, 12"X 12"4
719092 Cover, Top, 12"X 12"1
19093 Cover, Top, 12"X 18"
826408 Bumper, Round Self Adhesive 12
915147 Washer, Locking, 1/4 4
10 14962 Screw Cap, 12"X 18"4
11 19089 Spacer, Load Cell 1
12 15410 Spirit Level Bubble, Plastic 1
13 Load Cell, (see Ta b l e 5-2) 1
14 19132 Frame, Top, 12"X 12"1
19134 Frame, Top, 12"X 18"1
15 16141 Cable Tie 1
16 15409 Plastic Wire Clamp 1
17 15418 Rubber Grommet, 3/16 X 1/2 od 1
19 14918 Overload Protection Screw, 8-32 X 1/4 1
20 19139 Square Insert Guide 8
Table 6-2. 12" x 12" and 12" x 18" Mild Steel Parts List

16 Benchmark Series Installation & Service Manual
6.3 12" x 18" Model, Stainless Steel
Figure 6-3. 12" x 18" Stainless Steel Parts Illustration
Top View of Scale with
cover removed
4
24 18
15
16
19
21
20
14
11
822
3
2
117
9
10
12
7