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Load Measuring Pins

Product Description

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Magtrol Load Measuring Pins are temperature-compensated transducers used to measure load and force and provide overload protection. The pins are mounted into machines in place of normal shafts and fitted with strain gauges, allowing them to produce a signal proportional to the measured load.

Custom Capabilities

Receive a quotation for a load pin according to your application’s dimensions by filling out our load pin inquiry form.

Safety

The high safety level of Magtrol Load Measuring Pins makes their use possible in the following diversified application fields:

  • Cranes and lifting devices
  • Machine industry
  • Marine, tankers, offshore oil platforms
  • Nuclear industry
  • Aviation
  • Chemical industry

At the customer’s request, Magtrol can subject its load measuring pins to even more demanding tests such as:

  • Authenticity of the steel used
  • Impact tests by the EMPA (Swiss Federal Laboratory for Material Testing and Research)
  • Ultrasonic test
  • Magnetoscopic test
  • Test under reference load

Special Load Measuring Pins

Magtrol also manufactures special load measuring pins according to customer requirements. This shows our great flexibility for applications in extreme environments. Additionally, our computer calculation facilities allow us to respond quickly to any demand for special load measuring pins.

Features (Special Load Pins)

  • Customized Dimensions: diameter up to 250 mm/ length to 600 mm
  • High Load Capacity: up to 2500 kN)
  • Extended Operating Temperature: from -40°C to +200°C
  • High Pressure: up to 100 bar

Features

  • From 2.5 to 1250 kN (0.28 to 140 tons)
  • Admissible overload: 150% of the nominal load
  • Overload at rupture: 350% to 700% of nominal load (according to the model)
  • Temperature-compensated transducers with strain gauges in full-bridge configuration.
  • Pin made of high resistance stainless steel.
  • Insensitive to external mechanical and chemical effects (strain gauges inside the pin)
  • Ideal for use in hostile environments
  • Rugged and tight construction; maintenance-free
  • For new or refitted installations
  • ISO 9001 Certified

Receive a quotation for a load pin according to your application’s dimensions by filling out our load pin inquiry form.

Additional features unique to each series include:

LB 230 Series

  • Certified according to OIML R60 D0.1 from 50 to 200 kN for class IIII scales
  • Hermetically sealed execution for harsh environmental conditions (IP 67 protection class)

LE/LU 2xx, LE 4xx and LE 6xx Series

  • 2-wire (LE 2xx), 3-wire (LE 410), 4-wire (LU 210) or 6-wire (LE 610) electronics for transmission over great distances
  • EMC execution for reliable trouble-free operation
  • Built-in test equipment (B.I.T.E.) included on LE 410 and LE 610

Specifications and Drawings

For complete technical specifications and general dimension drawings, download the corresponding data sheet. For detailed dimension drawings. Click on the underlined link in the table below and a PDF document will open in a new window. Ratings apply to standard load pins only, special models are available by contacting Magtrol.

Model(s)Nominal
Load
(kN)
Nominal
Load
(tf)
Nominal
Diameter
(mm)
Drawing3D Models
LB-210 Series
(PG Radial)
3D Models
LB-210 Series
(PG Axial)
LB 2102.50.2825N/AstepN/A
LB 211
LB 231
50.5625pdfstepN/A
LB 212
LB 232
101.1225pdfstepN/A
LB 213
LB 233
202.2525pdfstepN/A
LB 214
LB 234
505.6235pdfstepstep
LB 235707.8745pdfN/AN/A
LB 216
LB 236
10011.2450pdfstepstep
LB 217
LB 237
20022.4865pdfstepstep
LB 218
LB 238
50056.2085pdfstepstep
LB 220
LB 240
1000112.40100pdfstepstep
LB 221
LB 241
1250140.50120pdfstepstep

Series RatingsLB 210 SeriesLB 230 Series
Mechanical Characteristics
Admissible Overload150%150%
Overload at Rupture500%500%
Electrical Characteristics
Bridge Impedance350 ohms700 ohms
Bridge ConfigurationSingleDouble
Output Signal0.5 to 1.8 mV/V0.5 to 1.8 mV/V
Accuracy (of FSD)0.5% to 0.8%*< 0.4%
Power Supply5 to 12 V DC / AC5 to 12 V DC / AC
AmplifierExternalExternal
Output ConnectionPG or ConnectorConnector Only
Environmental Characteristics
Protection ClassIP 66IP 67
Operating Temperature-25 °C to +80 °C
Storage Temperature-55 °C to +125 °C

LE/LU 2xx, LE 4xx and LE 6xx Series

Model(s)Nominal
Load
(kN)
Nominal
Load
(tf)
Nominal
Diameter
(mm)
LE/LU 210 Series
Downloads
LE 410 Series
(Axial Connector)
Downloads
LE 410 Series
(Axial Cable)
Downloads
LE 610 Series
(Axial Connector)
Downloads
LE 610 Series
(Axial Cable)
Downloads
LE 410
LE 610
2.50.2825NALE 410 pdf |
LE 410 with lubrication pdf
LE 410 pdf |
LE 410 with lubrication pdf
LE 610 pdf |
LE 610 with lubrication pdf
LE 610 pdf |
LE 610 with lubrication pdf
LE/LU 211
LE 411
LE 611
50.5625LE 211 pdf |
LU 211 pdf | step
stepstepstepstep
LE/LU 212
LE 412
LE 612
101.1225LE 212 pdf |
LU 212 pdf | step
stepstepstepstep
LE/LU 213
LE 413
LE 613
202.2525LE 213 pdf |
LU 213 pdf | step
stepstepstepstep
LE/LU 214
LE 414
LE 614
505.6235LE 214 pdf |
LU 214 pdf | step
stepstepstepstep
LE/LU 216
LE 416
LE 616
10011.2450LE 216 pdf |
LE 216 with lubrication pdf |
LU 216 pdf |
LU 216 with lubrication pdf | step
stepstepstepstep
LE/LU 217
LE 417
LE 617
20022.4865LE 217 pdf |
LE 217 with lubrication pdf |
LU 217 pdf |
LU 217 with lubrication pdf | step
stepstepstepstep
LE/LU 218
LE 418
LE 618
50056.2085LE 218 pdf |
LE 218 with lubrication pdf |
LU 218 pdf |
LU 218 with lubrication pdf | step
stepstepstepstep
LE/LU 220
LE 420
LE 620
1000112.40120LE 220 pdf |
LE 220 with lubrication pdf |
LU 220 pdf |
LU 220 with lubrication pdf | step
stepstepstepstep
LE/LU 221
LE 421
LE 621
1250140.50120LE 221 pdf |
LE 221 with lubrication pdf |
LU 221 pdf |
LU 221 with lubrication pdf | step
stepstepstepstep

Series RatingsLE 2xx SeriesLU 2xx SeriesLE 4xx SeriesLE 6xx Series
Mechanical Characteristics
Admissible Overload150%150%150%150%
Overload at Rupture≥500%*≥500%*≥500%*≥500%*
Electrical Characteristics
Bridge Impedance5000 ohms350 ohms350 ohms2x 350 ohms
Bridge Configuration2-wire4-wire3-wire6-wire
Output SignalRated 4 to 20 mA0 to 10 VRated 4 to 20 mA2x rated 4 to 20 mA
Accuracy (of FSD)± 0.1 %± 0.1 %< 0.25%*< 0.25%*
Power Supply12 to 32 VDC12 to 32 VDC19 to 32 VDC1 or 2x 19 to 32 VDC
Output ConnectionAxial connector
Souriau
851 02 E 10 6P50
Axial connector
Souriau
851 02 E 10 6P50
Integrated 3m, 6m,
12m or 20m cable,
Radox K-414
(standard) or axial
connector HUMMEL M16
Integrated 3m, 6m,
12m or 20m cable,
Radox K-814
(standard) or axial
connector HUMMEL M16
Environmental Characteristics
Protection ClassIP 66IP 66IP 66IP 66
Operating Temperature-25 °C to +80 °C-25 °C to +80 °C-25 °C to +80 °C-25 °C to +80 °C
Storage Temperature-55 °C to +125 °C-55 °C to +125 °C-30 °C to +90 °C-30 °C to +90 °C

* Depending on model. See data sheet.

Operating Principles

When forces acting on mechanical constructions are to be measured, the additional equipment required can often be costly and difficult to install. The load measuring pin offers an excellent solution since it acts as a direct element in the assembly, replacing a non-instrumented pin or shaft. When employed as a measuring transducer, the load pin can be used as a replacement for existing pins in:

Measurement Principle

The load measuring pins operate on a shearing principle. We measure the deformation proportional to the load through a strain gauge bridge integrated in the pin. When force is applied to the load measuring pin along its sensitive axis , the effect on the strain gauge bridge results in an output signal proportional to the applied force. The powering of the strain gauge bridge, as well as the amplification of its output signal voltage, is performed either by an external amplifier (LB series) or through its internal amplifier (LE and LU series). Depending on the execution, the amplifier allows the monitoring of several levels.

Before load is applied

After – the load is proportional to the signal

Single Bridge vs. Double Bridge

Single Bridge

  • 4 Strain Gauges
  • Output Impedance: 350 Ohms
  • Used on: Simple and symmetrical mountings
  • Standard accuracy

Double Bridge

  • 8 Strain Gauges
  • Output Impedance: 700 Ohms
  • Used on: Asymmetrical mountings
  • High accuracy

Applications

When forces acting on mechanical constructions are measured, the additional equipment required can often be costly and difficult to install. Magtrol’s Load Measuring Pins offers an excellent solution since they acts as a direct element in the assembly, replacing a non-instrumented pin or shaft.

Magtrol Load Measuring Pins and Load Cell Sensors are used for:

  • Mobile weighing and overload protection for cranes, hoisting gear, elevators, floor conveyers, winches, container loading bridges, lorry superstructure, multibucket vehicles, wagons and other lifting equipment.
  • Stationary weighing in silos, on platforms and in tanks.
  • Force measurement for regulation processes in industrial installations and machinery production.
  • Force detection under harsh environmental conditions in: tropical, offshore, submarine and harbor applications.

Double Drum Crane

Instrumentation on balancing wheel. Existing pin can be replaced by instrumented pin. No need for major modification of the machine / crane.


Air-Cargo Measurement During Conveyor Transportation

Magtrol SA developed a specially designed Load Measuring Pin for a German company that provides the world’s leading aerospace OEM manufacturers and air-cargo operators with the most advanced, efficient and cost-effective onboard cargo and baggage-handling systems.

The customer was in need of a measuring device that would monitor the weight of air-freight transported by conveyor belt. The load measuring device needed to be comprised of specific aerospace requirements including first article inspection, COC, 3.1B Material Certificate and a special aerospace marking. The customer also had specific price, design, quality and delivery expectations which Magtrol was able to meet by modifying the existing LB 210 Load Measuring Pin, without sacrificing reliability.

Modified LB 210 Load Measuring Pin designed specifically for air-cargo measurement during conveyer transportation. (Pocketknife is used for size reference only.)

Measuring Loads on a Container Loading Bridge

Using load pins to measure loads on a container loading bridge is a typical application for Magtrol’s Load Measuring Pins. This specific example shows how simple it is to replace existing shafts with load measuring pins just by slightly transforming the fixing system.

Four Magtrol Load Measuring Pins are located in the lifting rope attachments as indicated in the diagram. Knowledge of the pulley configuration allows one to work out the weight of the container held by the quick clamping device.

The LE Series Load Measuring Pin is ideally adapted to this type of assembly, being equipped with the 4 to 20 mA electronic unit. This enables a direct connection to the PLCs or a display in the driver’s cabin, even if the cabin is remotely located. The PLC of the crane will provide simultaneous monitoring of both the corner loads and total loads of a container to provide overload control and warn of shifting or unbalanced loads.

Container loading bridge using Magtrol LE Series Load Pin in place of shaft for accurate load monitoring, load balancing and overload protection.

Overload Protection for Palette Stapler in Automatic Warehouse


Knuckle-Boom


Harbor Crane Protection

Magtrol’s LB Load Measuring Pins are commonly utilized in harbor cranes to provide load acquisition of all crane positions. The pins simply replace the roller shafts in the pulley system making for low cost installation. They provide simultaneous monitoring of corner and total crane loads with high repeatability and high accuracy. With quality direct load measuring along with protection against overload, the user is given the vital information needed to prevent crane accidents.

Replacing roller shafts with load measuring pins provides direct-load measuring, along with information needed to prevent crane accidents.