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Unit of Measure

Features

N/A

  • Precison Load Sensing
  • Rugged
  • Internally Sealed Strain Gages
  • Easy Installation
  • Direct Force Measurement
  • High Strength Stainless Steel

Dimensional Drawing

Dimensional Drawing

 N/A
RCP-SCP Force Sensing Shackle Bolt
 RCPdim_page14_new.jpg

Specifications

Shackle Size

 N/A 1/2 Inch

Load Capacity

 N/A 4000 lb

Material

 N/A Stainless Steel 17-4, H-1025 (Standard)

Dp - Nominal Shackle Bolt Diameter

 N/A 0.625 in

AE - Shackle Opening

 N/A 0.81 in

AE - Tolerance ±

 N/A 0.06 in

BC - Width of Shackle Ear/D (Nominal)

 N/A 0.5 in

C - Clevis Bolt Head Diameter

 N/A 2.000 in

H - Inside Length of Anchor Shackle

 N/A 2.22 in

R - Outside Diameter of Shackle Ear (Nominal)

 N/A 1.43 in

T - Thread Size

 N/A 1/2-20 UNF

Shackle Type

 N/A Anchor Shackle

Connector Type

 N/A Permanently Attached Cable

Performance Specs

Overload without Zero Shift

 N/A 150%

Overload without Failure

 N/A 300% (Minimum)

Bridge

 N/A Full bridge 350 Ohm (Nominal)

Excitation

 N/A 12 V AC (Maximum) 12 V DC (Maximum)
Output Signal1 N/A 2-mV/V (Nominal) 2-mV/V (Standardized Output)

Non-Repeatability

 N/A ±0.15% FS (Nominal)

Non-Linearity

 N/A ±0.50% FS (Nominal)

Hysteresis

 N/A ±0.50% FS (Nominal)

Service Temp Range

 N/A to 150 °F

Temp Effects (on Zero)

 N/A 0.005% FS / °F (Nominal)

Temp Effects (on Output)

 N/A 0.008% load / °F (Nominal)
Zero Balance2 N/A ±2% FS (Nominal)

Electrical Specifications

Cable

 N/A #20(26x34) AWG., rubber insulation, shielded, rubber jacket, 4-Conductor (Standard Cable)

     Function 

 N/A Wire Code

     (+) Excitation 

 N/A Red

     (-) Excitation 

 N/A Black

     (+) Signal 

 N/A Green

     (-) Signal 

 N/A White

General Information

N/A Shackle Load Pins are strain gage transducers developed by Strainsert (U.S. Patent No. 3,695,096). They are manufacured utilizing the internal strain gage process perfected by Strainsert since 1960. They offer precision force measurement by simply replacing existing shackle pins.

The pin design is a double-shear arrangement. Typically, force P is applied at the center of the pin while 2 equal opposing forces of P/2 are applied at each end at the shackle ears. Strain gages are sealed inside a small axial hole and are positioned at the 2 shear locations at the interface between the shackle ears and the shackle eye. The strain gages are positioned and oriented with great precision along the neutral plane relative to the specific direction of force.

An anti-rotation device is necessary for proper reading and alignment. If a force P is applied to the pin at an angle other than the specified direction, the theoretical bridge output will be offset by a component of the force along the sensitive direction, i.e. P cos X.

The four strain gages (two at each shear location) are electrically connected to form a full bridge, the signal from each gage being additive so that the bridge output is proportional to the sum of the forces transmitted by the shear planes of the pin. The circuit typically includes temperature compensation, signal trim (optional), and zero balance resistors terminating in a suitable connector socket or integral cable, and potted with a sealing compound inside the gage hole for enhanced environmental protection.

Standard models include detailed calibration data up to 500,000 lbs. Higher capacity calibration data is available at an additional charge. Strainsert factory calibrations are intended to simulate installed conditions, however, it is recommended that an in-place calibration be performed to account for any installation, tolerance, and/or alignment influences affecting sensor measurement.

Standard models are typically used in new applications where the designer can develop the specific load pin joint around the standard load pin dimensions, to optimize force measurement performance. In addition, the standard load pin may fit or can be incorporated through the use of bushings or modification of the assembly.

  • 1 Exact output provided with calibration data. (Standardized outputs are optional). In addition, Strainsert factory calibrations are intended to simulate installed conditions, however, it is recommended that an in-place calibration be performed to account for any installation, tolerance, and/or alignment influences affecting sensor measurement.
  • 2 Prior to loading, it is necessary to initially/periodically null the zero load output to account for any residual offset.