Single-Ended Beam Load Cells
SBS Series precision shear beam load cells. 250 lbf to 20,000 lbf capacity. NTEP legal-for-trade models. Nickel-plated alloy steel construction for floor scales, belt scales, tank weighing, and platform applications.
Quick Overview
- 250 lbf to 20,000 lbf single-ended shear beam range
- NTEP certified models from 1 kLB to 20 kLB for trade applications
- 0.03% nonlinearity, 0.01% repeatability (NTEP models)
- 350Ω output, 10V DC excitation standard
- Nickel-plated alloy steel, sealed design
- Floor scales, belt scales, tank weighing, platform scales
- $180–$285 per unit depending on series
- Ships from Buffalo Grove, IL
SBS Series Standard Specifications
SBS Series Model Selection
Transcell offers 10 distinct single-ended beam models spanning 250 lbf to 20,000 lbf. The SBS-250LB and SBS-500LB are standard industrial versions. Models from 1 kLB upward are available in NTEP-certified variants for scales used in commerce and trade.
| Model | Capacity (lbf) | NTEP Certified | Envelope | Application Notes |
|---|---|---|---|---|
| SBS-250LB | 250 | No | Standard | Light-duty platform scales, small batching systems |
| SBS-500LB | 500 | No | Standard | Compact scales, bench-top applications |
| SBS-1KLB (NTEP) | 1,000 | Yes | Standard | Legal-for-trade floor scales, belt scales |
| SBS-2.5KLB (NTEP) | 2,500 | Yes | Standard | Medium-capacity platform scales, tank weighing |
| SBS-4KLB (NTEP) | 4,000 | Yes | Standard | Heavy-duty platform scales, OEM integration |
| SBS-5KLB (NTEP) – Small | 5,000 | Yes | Small Envelope | Space-constrained installations, compact mounting |
| SBS-5KLB (NTEP) – Large | 5,000 | Yes | Large Envelope | Distributed loading, multi-beam floor scales |
| SBS-10KLB (NTEP) | 10,000 | Yes | Standard | Industrial scales, truck scales, hopper weighing |
| SBS-15KLB | 15,000 | No | Standard | Heavy-duty industrial, non-trade applications |
| SBS-20KLB | 20,000 | No | Standard | Maximum capacity industrial weighing systems |
How Single-Ended Shear Beam Load Cells Work
Single-ended beam load cells operate on the principle of bending strain measurement. Unlike compression or button cells, the SBS design features a cantilevered beam geometry where load is applied at one end and the cell is fixed at the base. This configuration allows precise measurement of vertical loads applied through a single mounting point.
Mechanical Principle
As load is applied to the beam, the cantilevered section flexes slightly. Strain gauges bonded to the beam surface detect this deflection and generate an electrical signal proportional to weight. The 350Ω output is typical across all Transcell single-ended designs, allowing direct integration with modern digital indicators and load cell amplifiers without signal conditioning.
Material & Durability
SBS cells are constructed from nickel-plated alloy steel, which resists corrosion in industrial floor and tank environments. The sealed design (IP67 rating) protects internal strain gauges from moisture, dust, and chemical exposure. This combination of material selection and seal integrity ensures long-term stability and minimal drift even in demanding conditions.
Accuracy Characteristics
NTEP-certified SBS models deliver 0.03% nonlinearity and 0.01% repeatability, meeting legal-for-trade standards for commercial weighing. These specifications mean the cell maintains accurate output across its full capacity range with minimal variation between successive measurements. Non-certified models maintain industrial-grade accuracy sufficient for process control and OEM integration.
Who Specifies Single-Ended Beam Cells
Scale OEMs select SBS cells for floor scales, platform scales, and belt scales where a single fixed mounting point is preferable. The compact cantilevered design eliminates need for multiple support points, simplifying frame design and reducing material costs.
Batch mixing, tank weighing, and hopper discharge systems benefit from SBS reliability. The sealed design and strain gauge configuration perform consistently in high-vibration environments common to manufacturing floors.
Custom scale systems and industrial equipment often integrate SBS cells for their compact geometry and straightforward mounting. Available capacity range (250 lbf–20,000 lbf) accommodates light-duty to heavy-duty applications without requiring custom load cell development.
Retail, food, pharmaceutical, and chemical businesses rely on NTEP-certified SBS models for scales used in commerce. Legal certification ensures regulatory compliance for commercial transactions and contractual weighing obligations.
Selection Guide
Capacity Selection
Select capacity based on expected maximum load plus 20–25% safety margin. For example, a floor scale supporting 4,500 lbf of distributed load should specify the SBS-5KLB (NTEP) to ensure accurate operation within safe working limits. Transcell engineers can assist with load distribution analysis for complex mounting scenarios.
NTEP Certification Requirement
If the scale will be used for commercial transactions (retail sales, commodity trading, laboratory analysis subject to weights and measures regulation), specify an NTEP-certified model: SBS-1KLB through SBS-10KLB. For internal process control, material handling, or non-trade applications, standard SBS models (250 LB, 500 LB, 15 kLB, 20 kLB) offer cost efficiency.
Mounting & Envelope Considerations
Standard SBS models fit most applications. The SBS-5KLB is available in two envelope sizes: the small envelope variant saves space in tight mounting areas, while the large envelope distributes the load more broadly for greater stability in four-point platform designs.
Electrical Integration
All SBS cells output 350Ω at 10V DC excitation. Confirm your indicator, amplifier, or data acquisition system supports 350Ω load cell input. Most modern digital scales and industrial controllers handle this specification without additional modules.
Environmental Factors
The nickel-plated alloy steel construction and IP67 sealing provide robust performance in damp warehouse, outdoor, and chemical-storage environments. If corrosive chemical exposure is likely, consult Transcell engineering for optional protective coatings.
Installation and Mounting Best Practices
Structural Design Principles
Single-ended beams mount at the fixed end (base) using bolted or welded attachment. Ensure mounting surface is rigid and level. Load application must be vertical and centered on the load button or platform attachment point. Off-axis or eccentric loading causes measurement error and accelerates fatigue in the cantilever structure.
Cabling & Connector Management
Run signal cables in conduit separate from AC power lines to minimize electrical noise interference. Use shielded cable (typically 4-conductor) for lengths exceeding 50 feet. Connector types vary—Transcell supplies DB9, DIN, or bare-wire terminations depending on integration requirements. Consult the datasheet for specific pin assignments.
Calibration & Verification
After installation, perform zero-load verification and linearity check across the scale range using calibrated test weights. Drift testing over 24–48 hours confirms thermal stability. NTEP-certified cells must be calibrated by an authorized service lab before placing into trade service.
Load Distribution in Multi-Cell Systems
When multiple SBS cells support a single platform, ensure load is distributed evenly across all cells. Use load-sharing plates and adjust platform leveling to prevent one cell from carrying disproportionate weight, which compromises overall system accuracy.
Full Technical Specifications
| Parameter | SBS Standard | SBSB (Higher Grade) |
|---|---|---|
| Capacity Range | 250 lbf–20,000 lbf | 250 lbf–20,000 lbf |
| Nonlinearity | ±0.05% (standard), ±0.03% (NTEP) | ±0.02% |
| Repeatability | ±0.02% (standard), ±0.01% (NTEP) | ±0.01% |
| Electrical Output | 350Ω, 2mV/V nominal | 350Ω, 2mV/V nominal |
| Excitation | 10V DC recommended | 10V DC recommended |
| Input Impedance | 700Ω±10% | 700Ω±10% |
| Temperature Compensated Range | -10°C to +40°C | -10°C to +50°C |
| Operating Temperature Range | -20°C to +60°C | -20°C to +65°C |
| Material Construction | Alloy Steel, Nickel Plated | Alloy Steel, Nickel Plated + Protective Coat |
| Ingress Rating | IP67 Sealed | IP67 Sealed |
| Safe Load Limit | 150% of rated capacity | 150% of rated capacity |
| Ultimate Load Limit | 300% of rated capacity | 300% of rated capacity |
| Cable Length Standard | 6 feet (custom available) | 6 feet (custom available) |
| Connector Options | DB9, DIN, bare wire | DB9, DIN, bare wire |
| Price (per unit) | $180 | $285 |
NTEP Certification & Legal-for-Trade Requirements
The National Type Evaluation Program (NTEP) is a cooperative effort between the National Institute of Standards and Technology (NIST) and state weights and measures authorities. NTEP certification verifies that a load cell meets stringent accuracy, stability, and performance standards for use in commercial weighing applications.
Why NTEP Matters
When a scale is used for commerce—selling commodities by weight, charging fees based on measured load, or conducting official trade transactions—the scale must be equipped with NTEP-certified components. Regulators require this certification to ensure fair dealings and prevent fraud or measurement errors that disadvantage buyers or sellers.
Transcell SBS NTEP Models
The SBS-1KLB (NTEP), SBS-2.5KLB (NTEP), SBS-4KLB (NTEP), SBS-5KLB (NTEP), and SBS-10KLB (NTEP) carry full NTEP approval. These models undergo rigorous third-party testing and must be installed and calibrated according to NTEP regulations before first use in trade. The certificate of approval is supplied with each cell and must be retained for regulatory inspection.
Performance Validation During Installation
NTEP-certified cells must be calibrated within 24–48 hours of installation by an approved service laboratory. The calibration includes full-range linearity verification, repeatability testing, and documentation. Annual recertification is recommended for scales in continuous commercial service.
SBS vs. SBSB: Choosing the Right Grade
SBS Standard Series
The base SBS series delivers proven industrial performance at an economical price point ($180 per cell). Standard models work reliably in typical floor scale, platform scale, and tank weighing applications. Nonlinearity of ±0.05% (or ±0.03% for NTEP models) is sufficient for most industrial process control and batch mixing operations.
SBSB Higher-Grade Series
The SBSB series ($285 per cell) offers tighter specifications: ±0.02% nonlinearity and ±0.01% repeatability across the full operating range. The SBSB also includes an additional protective coating for enhanced corrosion resistance and extends the temperature-compensated range to +50°C (vs. +40°C for standard). Choose SBSB for pharmaceutical, food processing, and laboratory applications where measurement precision and long-term stability are critical.
Related Products & System Integration
Frequently Asked Questions
Ready to Specify Single-Ended Beam Cells?
Transcell engineers are available to assist with capacity calculations, mounting design, and NTEP certification planning. Request a quote today or download the SBS technical datasheet.
Engineering & Technical Support
Need help selecting the right capacity or configuring your scale system? Our engineering team is ready to assist.