Double-Ended Shear Beam Load Cells

How Double-Ended Shear Beams Work

Double-ended shear beam load cells employ a fundamental mechanical principle: deformation of the load cell’s shear web under axial loading produces a proportional electrical signal. Unlike single-ended cantilever designs, double-ended cells feature structural support at both ends, creating a symmetric load path that resists lateral deflection and improves stability in multi-cell weighing platforms.

Shear Web Deformation and Measurement

When a load is applied vertically to a double-ended shear beam, stress concentrates in the shear web—a thin, engineered section of the load cell body. Four strain gauges are bonded in a full Wheatstone bridge configuration across this web. As the web deforms in shear, two gauges experience tension while the other two experience compression. This symmetric strain distribution produces an output signal proportional to the applied load.

The DBS series achieves ±0.03% nonlinearity by precision machining the shear web and careful strain gauge placement. This level of accuracy ensures that signal output remains linear across the entire 2,500 to 75,000 lb range, critical for applications requiring repeatability and certified calibration.

Dual-End Stability and Platform Integration

The dual-end design mounts securely at both load cell ends—typically through clevis or stud connections—providing exceptional stability in multi-cell weighing systems. When four or more load cells support a platform, each cell bears a proportional share of the total load. The double-ended geometry minimizes tilt and rocking that could otherwise occur with single-ended designs, especially important in truck and rail scale applications where load distribution may shift dynamically.

mV/V Output and Integration

Each DBS cell outputs 2.0 mV/V at rated load. This passive bridge output (no excitation voltage supplied by the cell itself) integrates seamlessly with standard weight indicators, data acquisition systems, and junction boxes. A typical truck scale platform will sum outputs from four to eight DBS cells through a summing junction box, then feed the combined signal to a calibrated weight indicator for display and data logging.

Cable and Connector Standards

The standard 6-conductor shielded cable (42 ft) carries excitation voltage to the load cell bridge and returns the signal output without interference. The shield protects against electromagnetic noise common in industrial weighing facilities. Extended cable runs up to 300 ft are available; consult engineering support for runs exceeding standard lengths.

DBS Series Specifications

All DBS models include: Nickel-plated alloy steel construction, 6-conductor shielded cable (42 ft standard), passive mV/V bridge output, clevis or stud mounting options, operating temperature range −10 to +60°C, and NIST-traceable calibration certificate.

Key Features

Who These Load Cells Are For

Selecting the Right Capacity

Divide Total System Load by Number of Cells

Begin by determining the total maximum load (platform weight + maximum product weight) and divide by the number of load cells supporting the platform. For example, an 8,000 lb truck scale platform with a 40,000 lb scale capacity using four load cells requires:

Total Load ÷ Number of Cells = Load per Cell
(8,000 lb platform + 40,000 lb capacity) ÷ 4 cells = 12,000 lb per cell
Choose DBS-25000 (25,000 lb capacity)

Apply Safety and Dead Load Margin

Never select a load cell with a capacity equal to the calculated per-cell load. Always choose the next standard capacity above your requirement to account for dead load (platform structure, instrumentation, mounting hardware) and dynamic loading (shock, tipping, uneven distribution).

A common mistake is selecting a 10,000 lb cell for a calculated 10,000 lb per-cell load. This leaves zero safety margin. Use the DBS-25000 instead, which provides 2.5× safety factor and protects against overload events.

Legal-for-Trade Weighing

For systems requiring legal metrology approval (truck scales, commercial retail scales), verify that your weight indicator and load cell combination meet NTEP Certificate requirements. Transcell provides NIST-traceable calibration and can supply systems with OIML R60 compliance documentation. Contact engineering support for certification requirements in your jurisdiction.

Overload and Shock Protection

The 150% safe overload rating protects against accidental overloading. If a truck scale experiences a 10,000 lb shock load (impact, braking, or skidding), the 25,000 lb cell rated for 150% overload (37,500 lb) handles this event without damage. The ±0.03% nonlinearity specification remains valid across the safe operating range.

Mounting and Installation

Mounting Surface Requirements

Install double-ended shear beam cells on flat, rigid surfaces. Platform steel should be machined or ground flat within 0.005 in. across the mounting area. Uneven surfaces cause unequal load distribution and compromise system accuracy. Use a precision level to verify platform flatness before bolting load cells.

Anti-Rotation Hardware

Secure both ends of each load cell with clevis pins, studs, or pin-and-bracket hardware specified in the datasheet. For clevis mounting, use hardened steel pins and lock washers to prevent rotation. Tight hardware (torque specifications provided in installation guide) ensures symmetric load introduction and prevents lateral shifting during dynamic weighing.

Cable Routing and Grounding

Route the 6-conductor shielded cable away from motor drives, high-voltage power lines, and RF transmitters. Secure cable with cable ties every 12 inches where practical. Ground the cable shield at the junction box input terminal only—do not ground at both ends, as this creates a ground loop and introduces noise into the measurement signal.

Junction Box Wiring

In a multi-cell system, connect each load cell’s six wires to the summing junction box input terminals in parallel for the excitation voltage lines and in a 4-wire summing configuration for the sense lines. A standard four-load-cell configuration will have four cells wired in parallel to the junction box, which then outputs a single 2.0 mV/V combined signal to the indicator.

Verify junction box wiring using an ohmmeter before connecting power. Expected resistances vary by junction box model; consult the junction box manual for correct values. Incorrect wiring causes erratic readings or complete signal loss.

Corner Test and Balancing

After installation, perform a corner test by applying a known test weight to each corner of the platform individually. Record the weight reading from the indicator for each corner. Readings should not vary by more than 0.5% across corners. If variation exceeds this, check load cell alignment, platform flatness, and junction box wiring.

Some systems require load cell balancing (bridge balance adjustment at the indicator) if individual cell outputs vary slightly. Consult the weight indicator manual for balancing procedure.

Double-Ended vs. Single-Ended Shear Beams

Understanding the structural and performance differences between double-ended and single-ended shear beam designs informs correct load cell selection for your application.

Recommendation: For weighing systems with four or more load cells, specify double-ended shear beams. The superior stability reduces calibration time, minimizes tilt-related errors, and provides long-term reliability. Single-ended cells are appropriate only for three-cell or smaller systems where stability is less critical.

Standards and Calibration

NIST-Traceable Calibration

Every DBS load cell ships with a NIST-traceable calibration certificate documenting output linearity, hysteresis, repeatability, and zero balance at the time of manufacture. Calibration uses precision dead-weight standards and is performed at 70°F (21°C). The certificate confirms ±0.03% nonlinearity and validates 2.0 mV/V rated output within ±0.1% tolerance.

ISO 9001 Quality Assurance

Transcell manufacturing processes maintain ISO 9001 certification. Each load cell batch includes 100% electrical testing, dimensional inspection, and environmental stress screening. Rejected units do not leave the facility; defect rate is tracked and trending analysis prevents recurring issues.

System-Level NTEP and OIML R60 Compliance

Individual load cells do not require NTEP certification; the complete weighing system (load cells + indicator + junction box) achieves NTEP approval as a package. OIML R60 is an international metrology standard for non-automatic weighing devices. Transcell can provide datasheets and test reports to support your system’s legal metrology approval. Consult engineering for your jurisdiction’s specific requirements.

Annual Recalibration Recommendation

For critical applications (truck scales, shipping verification), recalibrate load cells annually using certified dead-weight standards. Over time, material creep and thermal cycling can cause small shifts in output. Annual verification ensures continued compliance with accuracy specifications.

How Transcell Compares

Direct Replacements, No System Redesign

DBS load cells are direct replacements for Rice Lake RL75016, RTI 5203, Sensortronics 65016, and Celtron DSR models. Same mounting dimensions, same 2.0 mV/V output, same cable interface. No code changes to the weight indicator, no recalibration procedures beyond standard corner balance. Swap the load cell and verify system accuracy using a corner test and a known calibration weight.

2–5 Day Shipping from Illinois

DBS cells in standard capacities are stocked in Buffalo Grove, Illinois. Orders placed by 2 PM Central Time ship same business day. Standard ground delivery reaches most U.S. locations within 2–5 business days. Rush and overnight options available.

STEP Files and CAD Integration

Download detailed 3D CAD models (STEP format) for each DBS capacity from the product page. Use in CAD for platform design, mounting hole verification, and cable routing. 2D dimensional drawings (PDF) also available for printing and on-site reference.

Engineering Support and Customization

Transcell engineering team provides application consultation, custom cable lengths, non-standard mounting hardware, and white-label datasheets for OEM customers. Contact support at +1-800-503-9180 or sales@transcell.com.

Quality Assurance and Long-Term Supply

All DBS models undergo 100% electrical testing, dimensional inspection, and 48-hour environmental stress screening. Strict lot tracking and long-term production commitment ensure consistent availability and quality. NIST-traceable calibration is standard with every unit.

Frequently Asked Questions