Strainsert Co.
12 Union Hill Rd.,West Conshohocken, PA 19428
Phone: 610-825-3310
Fax: 610-825-1734
Toll-free: 800-529-1502
Email: tfoley@strainsert.com
Website: http://www.strainsert.com
All Products > Load Pins > SPA Series, Wire Rope Load Pins > Item # SPA-300  


Item # SPA-300, SPA Series, Wire Rope Load Pins





Features  · Dimensional Drawing  · Specifications  · Performance Specs  · Electrical Specifications  · General Information

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


Dimensional Drawing

Dimensional Drawing


Specifications

Load Capacity
300,000 lb

Wire Rope Diameter
2.75–2.88 Inch

Material
Stainless Steel 17-4, H-1025 (Standard)

A - Width of Center Loading Section
3-7/8 in

B - Width of Clevis Support Section
2-11/16 in

C - Length of Pin Reduced Section, Instrumented Zone
1-1/8 in

Dp - Nominal Pin Diameter
5.000 in

E - Active Length of Pin
11-1/2 in

F - Clevis Pin Head Length
2.25 in

G - Extension of Pin for Keeper Plate Installation
1-1/2 in

H - Width of Keeper Plate Slot
25/32 in

J - Depth of Keeper Plate Slot
1 in

L - Overall Length of Pin
15-1/4 in

U - Nominal Spacer Thickness
1/4 in

Weight
83.0 lb

Safety Factor
4.1

Keeper Plates
SPA-300-112-1-A

Connector Type
Axial Connector
Permanently Attached Axial Cable


Performance Specs

Overload without Zero Shift
150%

Overload without Failure
300% (Minimum)

Bridge
Full bridge 350 Ohm (Nominal)

Excitation
12 V AC (Maximum)
12 V DC (Maximum)

Output Signal1
2-mV/V (Nominal)
2-mV/V (Standardized Output)

Non-Repeatability
±0.15% FS (Nominal)

Non-Linearity
±0.50% FS (Nominal)

Hysteresis
±0.50% FS (Nominal)

Service Temp Range
to 150 °F

Temp Effects (on Zero)
0.005% FS / °F (Nominal)

Temp Effects (on Output)
0.008% load / °F (Nominal)

Zero Balance2
±2% FS (Nominal)
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.


Electrical Specifications

Receptacle
PTIH-10-6P

Mating Plug
PT06A-10-6S (SR)

     Function
Pin

     (+) Excitation
A

     (-) Excitation
D

     (+) Signal
B

     (-) Signal
C

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

     Function 
Wire Code

     (+) Excitation 
Red

     (-) Excitation 
Black

     (+) Signal 
Green

     (-) Signal 
White


General Information
Wire Rope 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. We offer precision force measurement by simply replacing existing wire rope load pins.

The 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. Strain gages are sealed inside a small axial hole and are positioned at the 2 shear locations at the interface between the center eye and pin ends. 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.

Calibration data up to 500,000 lbs. Higher capacity calibration data is available at an additional charge. Inquire for custom product ranges.

Applications include mooring lines, clam shells, crane cables, bridge support cables, and cable dead ends.