KM Bolt-On Weight Sensors - Kistler-Morse

{INTRODUCTION}
As you fill and empty a silo, the vessel support structure
deflects. The KM Bolt-On sensors are mounted to that
support structure and measure the deflection to within a
useful tolerance.
The operator will see this deflection as weight readings
and can reliably utilize the information for bulk inventory
weighing. By providing actual live material load capacity
(e.g. 120 tons) and a cross section support dimension
(e.g. each support leg is 10 in 2 ) it is simple to derive a
loading factor and predict system accuracy.
For compartmentalized bins or other structures that cannot
be weighed, contact KM for level monitoring solutions.
KM Bolt-On
Weight
Sensors
How to analyze vessel support structures and apply
the KM L-Cells and Microcells to your new and existing
vessels. This creates a weighing system better utilizing
your bulk storage capacity.
L-CELL ®
{RAW BULK MATERIAL}
{IN-PROCESS}
{BULK LOADOUT}
Stress Level - Carbon Steel Applications:
Maximum: ±15,000 psi (10.5 kg/mm 2 )
Recommended: 5,000 ± 3,500 psi (3.5 ± 2.5 kg/mm 2 )
Stress Level - Aluminum Applications:
Maximum: ±6,500 psi (4.6 kg/mm 2 )
Recommended: 3,000 ± 1,500 psi (2.1 ± 1.1 kg/mm 2 )
Sensitivity - Carbon Steel:
35 mV ± 1%/1,000 psi (35 mV ± 1%/0.7 kg/mm 2 )
FINISHED
{ PRODUCT}
Sensitivity - Aluminum:
80 mV ± 1%/1,000 psi (80 mV ± 1%/0.7 kg/mm 2 )
{BULK RECEIVING}
{IN-PROCESS}
To proceed, simply complete the following 4 STEPS and
contact your local KM sales representative or a factory
applications engineer:
STEP 1: SELECT VESSEL TYPE
STEP 2: COMPLETE CALCULATIONS
STEP 3: SELECT ELECTRONICS
STEP 4: CONTACT KM REPRESENTATIVE
MICROCELL
Stress Level - 3-inch Microcell:
Maximum: ±10,000 psi (7.0 kg/mm 2 )
Recommended: 5,000 ± 2,500 psi (3.5 ± 1.75 kg/mm 2 )
Stress Level - 2-inch Microcell:
Maximum: ±15,000 psi (10.5 kg/mm 2 );
Recommended: 7,500 ± 3,750 psi (5.3 ± 2.6 kg/mm 2 )
Sensitivity - Carbon Steel 3-inch Microcell:
70 mV ± 1%/1,000 psi (70 mV ± 1%/0.7 kg/mm 2 )
Sensitivity - Carbon Steel 2-inch Microcell:
56 mV ± 1%/1,000 psi (56 mV ± 1%/0.7 kg/mm 2 )
Due to the L-Cell’s superior thermal characteristics,
it is the preferred bolt-on weight sensor for all
applications with the exception of pipe legged
vessels. The Microcell must be used on pipe legged
vessels as the horizontal axis of the L-Cell cannot be
conformed to the radius of the pipe leg without
damage to the sensor.

Bulk
Inventory
Weight
Measurement
Using:
Product
Selection
and
Application
Guide
{VESSEL TYPES}
{VERTICAL LEG VESSELS}
{HORIZONTAL BEAM VESSELS}
STEP 1 STEP 1
STEP 1
{KISTLER-MORSE}
{SKIRTED SILOS}

{LEG SUPPORTED VESSELS}
Is this a stand-alone vessel supported on legs?
If YES, find the best match for your vessel type from drawings 101 to 401. Proceed to STEP 2.
If NO, go to section entitled HORIZONTAL BEAM SUPPORTED VESSELS.
101
N=0
102
N=0
202
N=1
NOTE: Other L-Cell mounting locations for series 200 and up
may be feasible for increased accuracy. Consult factory.
502 502 502
201
N=1
{HORIZONTAL BEAM SUPPORTED VESSELS}
Is this vessel supported by horizontal beams and/or diagonals?
If YES, find the best match for your vessel type from drawings 502 to 602. Proceed to STEP 2
If NO, go to section entitled SKIRTED SILOS.
551
553
203
N=2
553 553
301
N=2
302
N=2
303
N=2
601 601 601
304
N=2
401
N=2
LEGEND
Mounting Location for L-Cell
N Cross-Brace Effect
STEP 2 STEP 2
602 602
651 651 651 701
LEGEND
Vertical Leg
Vessel Support Point
Ring Supported Vessel
Mounting Location for L-Cell
{SKIRTED SILOS}
Does only the skirt support this vessel?
If YES, find the best match for your Vessels Diameter. Proceed to STEP 2
If NO, consult with the factory.
4 5 3
6
4 5 6
3 7
2
1
8
5 6 7
4 8
3 9
2 10
1
45 6 7 8
9
10
3 11
2 12
1
5
6 7 8 9
10
11
4
3
2
1
12
13
14
7 8 9 10
11
6
12
5
4
3
2
1
13
14
15
16
8 9 10 11
7
12
6
5
13
14
4
3
2
1
15
16
17
8
7
6
5
4
9 10 11 12 13
14
15
16
17
3
2
1
18
19
20
STEP 2
9’ (2.7m) Dia.
9’- 5” (2.9m)
L-Cell Spacing
12’ (3.7m) Dia.
9’- 5” (2.9m)
L-Cell Spacing
15’ (4.6m) Dia.
9’- 5” (2.9m)
L-Cell Spacing
2 1
LEGEND
18’ (5.5m) Dia.
9’- 5” (2.9m)
L-Cell Spacing
21’ (6.4m) Dia.
9’- 5” (2.9m)
L-Cell Spacing
24’ (7.3m) Dia.
9’- 5” (2.9m)
L-Cell Spacing
26’ (7.9m) Dia.
9’- 5” (2.9m)
L-Cell Spacing
28’ (8.5m) Dia.
8’-10” (2.7m)
L-Cell Spacing
L-Cell Set
Junction Box
Door

Number of Similar Vessels
Vessel Type (Select closest type 101-104)
Leg Type
(If pipe leg - use Microcells in same configuration as L-Cells)
LEG TYPES
A
C
B
I-BEAM
Area = (A x 2B) x C
A
C
B
ANGLE
Area = (A + B) x C
Live Load (Working capacity)
lbs
Number of Legs
Live Load per Leg (See formula)
Steel Area Calculation (See Leg Type formula)
Load Factor (See formulas)
Percentage ±Error (From chart at right) ±
Accuracy (In pounds)
±
Proceed to STEP 3
lbs
in 2
psi
%
lbs
FORMULAS
A T T D
B
TUBULAR
Area = (2A + 2B) x T
PIPE
Area = 3.14 x D x T
Live Load per Leg = Live Load (Working capacity) ÷ Number of Legs
Load Factor (psi) = Live Load per Leg ÷ Steel Area Calculation
Accuracy in Pounds = Live Load x ±Error% (From chart at right)
Number of Similar Vessels
Vessel Type (Select closest type 502-602)
LEG TYPE
A
D
Live Load (Working capacity)
Number of Support Beams
lbs
I-BEAM
Shear Area = A x D
Live Load per Support Point Beam (See formula)
Steel Area Calculation (See Shear Area formula)
lbs
in 2
FORMULA
Load factor (See formula)
psi
Percentage ±Error (From chart at right)
±
%
Accuracy (In pounds)
±
lbs
Proceed to STEP 3
Number of Similar Silos
Silo Type (Bolted or Welded)
SILO
TYPE
Live Load (Working capacity)
lbs
Vessel (D)iameter (In inches)
in
Skirt (T)hickness (In inches)
in
T
Load Factor (See formula)
psi
D
Percentage ±Error (From chart at right)
Accuracy (In pounds)
±
±
%
lbs
FORMULA
Load Factor (psi) = Live Load (Working capacity) ÷ (3.14 x D x T)
Proceed to STEP 3
Accuracy in Pounds = Live Load x ±Error% (From chart at right)

LEG ACCURACY CHART
{± ERROR %}
9
8
7
6
5
4
3
2
1
CONSULT FACTORY
{3089 psi}
{example}
Outside N=0
Outside N=1
Outside N=2
Inside N=0
Inside N=1
Inside N=2
EXAMPLE {see example to the left}
Storage silo located outside with a capacity of 120,000 lbs. It is supported
by four 10” I-Beam legs (that are type W10X33). There are no braces.
Vessel Type 101
Leg Type I-Beam W10X33 (10” x 8”)
Live Load
120,000 lbs
Number of Legs 4
Live Load per Leg 120,000 ÷ 4 = 30,000 lbs per Leg
Steel Area Calc. 9.71 in 2
Load Factor
3,089 psi
Accuracy
±2.5% of 120,000 lbs = ±3,000 lbs
2 L-Cells per leg with appropriate electronics.
0
0 1000 2000 3000 4000 5000 6000 7000 8000 9000
{STRESS IN PSI}
See Vessel Drawing for N value.
HORIZONTAL ACCURACY CHART
{± ERROR %}
9
8
7
6
5
4
3
2
1
0
0
CONSULT FACTORY
{example}
{3600 psi}
1000 2000 3000 4000 5000 6000 7000 8000 9000
{STRESS IN PSI}
4 Cells/Beam
2 Cells/Beam
1 Cell/Beam
EXAMPLE {see example to the left}
Load out vessel located outside with a capacity of 120,000 lbs. It is beam
supported by four diagonal 12” I-Beams (that are type W12X53). There
are no other support points. NOTE: In load out applications, batch
accuracy is typically greater than inventory accuracy as stated.
Vessel Type 551
Leg Type I-Beam W12X53 (12” x 10”)
Live Load
120,000 lbs
Number of Beams 4
Live Load per Beam 120,000 ÷ 4 = 30,000 lbs per support Beam
Shear Load per Beam 30,000 ÷ 2 = 15,000
Steel Area Calc. 4.161 in 2
Load Factor
3,605 psi
Accuracy
±1.75% of 120,000 lbs = ±2,100 lbs
2 L-Cells per support beam with appropriate electronics.
STEP 3
SKIRT ACCURACY CHART
{± ERROR %}
18
16
14
12
10
8
6
4
2
CONSULT FACTORY
{2123 psi}
{example}
Best Case
Worst Case
Working Area
EXAMPLE {see example to the left}
Receiving silo for flour is a Peabody bolted TecTank ® that is 12’ in
diameter by 56’ tall and located outside. It has a skirt thickness of 3/16”
and holds 180,000 lbs. The fill method is pneumatic and the use of the
system will be for inventory purposes.
Vessel Type
Skirted Silo (Bolted)
Live Load
180,000 lbs
Vessel Diameter 144 in (12 Feet)
Skirt Thickness 3/16 in (0.1875)
Load Factor
2,123 psi
Accuracy
±3.0 to 5.0% of 180,000 lbs = ±5,400 to 9,000 lbs
4 sets of L-Cells per silo with appropriate electronics.
0
0 1000 2000 3000 4000 5000 6000 7000 8000 9000
{SKIRT STRESS IN PSI}

STEP 3 STEP 4
Select the electronics
and options that meet
your requirements.
SVS2000
A single-vessel weight indicator featuring easy to read
LCD display, menu driven “quick-config” and net/tare/gross
functions with modular output options. NEMA 4X plastic.
WEIGH ll
A 1-4 vessel weight indicator featuring easy to read LCD
display, menu driven “quick-config” and net/tare/gross
functions with modular output options. NEMA 4X plastic.
MVS 4D (MULTI-VESSEL SYSTEM)
A controller for measuring and monitoring bulk material
inventories. By combining simple plug-in input and
output cards to match your specific needs this multivessel
system will monitor and provide control for up
to 32 vessels.
MVS 8D (MULTI-VESSEL SYSTEM)
A vessel controller (19” rack configuration) for
measuring and monitoring bulk material inventories.
By combining simple plug-in input and output cards
to match your specific needs this multi-vessel, rack
mount system will monitor and provide control for
up to 120 vessels.
{FAX TO
FACTORY}
425.402.1500
VESSEL INFORMATION
Type
Capacity
PSI
Accuracy
ELECTRONIC INFORMATION
Type
Options
Date
1
1-4
1-32
Number of Vessels
1-120
SITE INFORMATION
Company Name
Address
City, State, Zip
Phone
( )
Monitored
Opt
Opt
Opt
Opt
Analog (4-20 mA)
CONTACT INFORMATION
Name
Title
Std
Opt
Opt
Opt
Relay Setpoints
Opt
Std
Std
Std
Serial Communications
RS422/485
Opt
N/A
N/A
N/A
Fax
DeviceNet
Allen-Bradley
Remote I/O(RIO)
Opt
Opt
Opt
Opt
( )
Phone ( )
Fax ( )
Std
Std
Std
Opt
Nema 4X Enclosure
Stainless Steel
Enclosure
Opt Std
Opt Std
Opt Std
N/A Std
CE Approval
UL Approval
Std
N/A
N/A
N/A

NOTES:
P/N 97-5092
KM is represented in your area by:
WORLD HEADQUARTERS
19021 120th Ave. NE
Bothell, WA 98011 USA
1.800.426.9010
tel: 425.486.6600
fax: 425.402.1500
kistlermorse.com
EUROPE
Rucaplein 531
B-2610 Wilrijk-Belgium
+32.3.218.99.99
fax: +32.3.230.78.76
kistler.morse@skynet.be