Single Point
Single-Point Load Cells for Bench Scales, Checkweighers & OEM Platforms
An engineering reference for selecting, specifying, and integrating single-point load cells in platform scales, checkweighers, packaging machines, and OEM weighing systems.
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TL;DR — Single-Point Load Cell Overview
- What: A single-point load cell — also called a platform load cell, bench scale load cell, checkweigher load cell, or moment-compensated load cell — is a bending-beam strain-gauge sensor that supports an entire weighing platform with one sensor and maintains accuracy under off-center loading.
- Key advantage over multi-cell systems: One sensor replaces a four-cell configuration with junction box and corner trimming, reducing cost, complexity, and installation time for platforms within the rated size.
- Primary applications: Bench scales, industrial platform scales, checkweighers, packaging machines, ingredient batching/dosing, OEM weighing modules, retail and counting scales.
- Transcell families: FAK (low-capacity precision, from 3 kg), FAS (30–50 kg general purpose), FASB (mid-capacity), FAV (100–500 kg, cross-compatible), FAY (250–1,000 kg, large platforms). Aluminum and stainless steel options.
- Key specs: Capacities from 1 kg to 1,000 kg, combined error ≤ ±0.02–0.03% F.S., output 2.0–3.0 mV/V, IP65–IP67, OIML R60 and NTEP models available.
- When NOT ideal: Platforms exceeding the model’s rated size (use shear beam multi-cell systems instead), floor-scale capacities above 1,000 kg, suspended or tension loads (use S-type), high-capacity compression (use pancake).
- Manufacturer: Transcell Technology, Buffalo Grove, IL — U.S.-based manufacturer with OIML/NTEP certified models, calibration services, and OEM integration support including cross-reference compatibility with Tedea, HBM, Rice Lake, and NMB models.
What Is a Single-Point Load Cell?
A single-point load cell is a strain-gauge sensor — often classified as a type of bending beam — designed so that one sensor can support an entire weighing platform. The internal geometry and strain-gauge arrangement compensate for bending and torsion, allowing the sensor to maintain accuracy even when loads are applied off-center within the rated platform area. Engineers and weighing-system designers also refer to these as platform load cells, single-point weighing sensors, or moment-compensated load cells.
For OEMs and scale builders, this means a compact weighing system can be constructed with a single sensor instead of a four-corner configuration that requires a junction box and corner trimming. The result is lower component cost, simpler wiring, and faster assembly.
A single-point load cell is only one component in the measurement chain. System accuracy also depends on platform rigidity, mounting quality, and the indicator or signal conditioner used to amplify and display the mV/V output.
Single-point design compensates for off-center loads across the entire rated platform area.
How Single-Point Load Cells Work
Single-point load cells use a machined aluminum or stainless steel element with a precision-cut internal aperture. This aperture controls the thickness of the metal at critical points, creating predictable flexure zones. When a load is applied — even off-center — the geometry distributes strain to bonded strain gauges in a pattern that compensates for bending moments and torsion.
The strain gauges are wired into a Wheatstone bridge that produces a differential mV/V output proportional to the applied force. With proper excitation (typically 5–10 VDC), this signal is amplified by an indicator or conditioner and converted to engineering units (kg, lb, N).
The key engineering feature is moment compensation: the aperture geometry and gauge placement are tuned so that loads placed anywhere within the rated platform area produce the same output (within specification) as a centered load. If the platform exceeds the rated size, this compensation breaks down and off-center errors increase.
When Engineers Choose Single-Point Load Cells
- Compact platform scales: Bench scales, retail scales, table-top platforms where one sensor simplifies construction and reduces cost.
- Checkweighers and packaging machines: High-throughput production lines where packages land at varying positions on the platform. The off-center tolerance eliminates the need for precise load centering.
- Ingredient batching and dosing: Filling systems, recipe batching, and small-vessel weighing where fast response and compact form factor are needed.
- OEM weighing modules: Embedded sensors inside equipment — printers, medical devices, lab instruments, portioning systems — where the load cell is a hidden component.
- Counting scales and parts counting: High-resolution models (OIML C3 or higher) support division counts sufficient for piece-counting applications.
- Conveyor belt weighing: Compact conveyor scales with short weigh zones where a single sensor is mounted under the belt frame.
When Single-Point Load Cells Are Not Ideal
- Platform exceeds the rated size: Off-center compensation degrades. Use a multi-cell shear beam system with a junction box instead.
- Capacities above ~1,000 kg: Most single-point models top out around 500–1,000 kg. For heavier loads, consider shear beams or pancake compression load cells.
- Tension or suspended loads: Single-point cells are compression-only. Use an S-type load cell for hanging or in-line tension applications.
- Floor scales and pallet scales: Typically require larger platforms and higher capacities best served by four shear beam cells.
- Extreme dynamic speed: For very high-speed dynamic weighing (multi-head combination weighers), specialized high-frequency single-point models may be needed — confirm natural frequency with the datasheet.
Single-Point vs. Shear Beam: Choosing the Right Platform Sensor
| Criterion | Single-Point | Shear Beam (Multi-Cell) |
|---|---|---|
| Number of sensors | 1 | 3 or 4 |
| Off-center compensation | Built into the sensor geometry | Achieved by corner trimming in junction box |
| Typical platform size | Up to ~18 × 18 in. (model dependent) | Larger — 3 × 3 ft. to 5 × 5 ft. and beyond |
| Typical capacity range | 1 kg to ~1,000 kg | 500 lb to 50,000 lb+ |
| System cost | Lower (1 sensor, no junction box) | Higher (4 sensors + junction box + corner trim) |
| Installation complexity | Simple — one bolt pattern | More complex — leveling, cabling, trimming |
| Best for | Bench scales, checkweighers, OEM modules | Floor scales, pallet scales, tank/hopper systems |
If your platform fits within the single-point model’s rated size and capacity, a single-point system will typically be simpler and more cost-effective. When the platform exceeds those limits, transition to a shear beam configuration.
Transcell Single-Point Load Cell Families
Transcell manufactures several single-point families to match different capacities, platform sizes, and operating environments. All families are available with datasheets, dimensional drawings, and 3D CAD files.
FAK Series — Low-Capacity Precision
Aluminum single-point load cells from 3 kg to 10 kg. Designed for small retail scales, laboratory balances, and precision dosing equipment. Cross-compatible with Rice Lake RL1521A, Tedea 1022, HBM PW6KRC3, and Scaime LP.
FAS Series — Mid-Capacity General Purpose
Aluminum single-point load cells for 30 kg and 50 kg applications. A versatile choice for bench scales, counting scales, and compact packaging equipment. Cross-compatible with Rice Lake RL1042, Tedea 1042, and HBM SP4.
FASB Series — Mid-Capacity
Aluminum single-point load cells covering mid-range capacities. Suited for general-purpose bench weighing and OEM integration where a compact envelope is required.
FAV Series — Mid-Capacity, Cross-Compatible
Aluminum single-point load cells from 100 kg to 500 kg. Used in industrial bench scales, checkweighers, and OEM platforms. Cross-compatible with Tedea 1263, HBM PW24, and NMB C2L1.
FAY Series — High-Capacity, Large Platforms
Aluminum single-point load cells from 250 kg to 1,000 kg for larger platform scales and heavier-duty checkweighing. Cross-compatible with Rice Lake RL1250, Tedea 1250, HBM PW12, and Celtron LOC. Supports wider platform dimensions than lower-capacity families.
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Key Specifications
The following table summarizes typical specification ranges across Transcell single-point families. Always consult the model-specific datasheet for exact values.
| Parameter | Typical Range / Options |
|---|---|
| Rated Capacity | 1 kg to 1,000 kg (model dependent) |
| Material | Aluminum alloy (standard) or stainless steel (select models) |
| Rated Output | 2.0–3.0 mV/V nominal |
| Recommended Excitation | 5–12 VDC (model dependent; see datasheet for maximum) |
| Combined Error | ≤ ±0.02% to ±0.03% F.S. |
| Repeatability | ≤ ±0.01% F.S. |
| Rated Platform Size | Up to manufacturer-specified maximum per model (e.g., 18 × 18 in.) |
| Safe Overload | 150% F.S. typical |
| Ultimate Overload | 300% F.S. typical |
| Sealing / Protection | IP65 or IP67 (model and material dependent) |
| Approvals | OIML R60 C3, NTEP (select models) |
For exact capacity, dimensional, and certification details, see individual product pages or contact Transcell engineering.
Aluminum vs. Stainless Steel: Material Selection
| Criterion | Aluminum | Stainless Steel |
|---|---|---|
| Cost | Lower | Higher |
| Weight | Lighter | Heavier |
| Corrosion resistance | Adequate for dry indoor environments | Required for washdown, food processing, and outdoor exposure |
| IP rating (typical) | IP65 | IP67 or higher |
| Best applications | Retail scales, counting, OEM modules, general bench weighing | Food/beverage, pharmaceutical, chemical, outdoor |
| Natural frequency | Generally higher (lighter mass) | Generally lower |
If the operating environment involves water, chemicals, temperature cycling, or sanitation requirements, stainless steel is the safer choice. For indoor, dry, and cost-sensitive applications, aluminum provides excellent performance at lower cost.
Mounting, Platform Design & Installation
Mounting quality is the single largest factor in field accuracy for single-point systems. The sensor’s moment compensation works correctly only when the mounting and platform are mechanically sound.
- Mounting surface: Flat, rigid, and hardened. Both the base and the platform attachment surfaces must be machined flat. Use the recommended bolt torque from the datasheet.
- Platform size: Do not exceed the model’s rated platform dimensions. Oversized platforms degrade off-center accuracy. The rated size is specified on the datasheet — verify before design.
- Platform rigidity: A flexible platform deflects under load and redistributes stress incorrectly. Use sufficient material thickness and stiffening ribs if needed.
- Orientation: Mount with the load arrow pointing in the correct direction. Most single-point cells are top-loaded with the platform attached to the free end.
- Side loads: Avoid lateral forces on the sensor. On conveyor scales, use a floating or pivoting top plate to decouple horizontal belt forces from the load cell.
- Cable protection: Route the cable away from heat, sharp edges, and power lines. Use strain relief at the cable exit to prevent damage during installation or maintenance.
- Leveling: Ensure the base and platform are level. An unlevel system introduces a cosine error that reduces accuracy.
Correct mounting preserves accuracy. Incorrect mounting introduces side loads and off-center errors beyond compensation range.
Wiring & Signal Conditioning
Most Transcell single-point load cells use a standard 4-wire configuration. Always confirm color codes with the model-specific datasheet — conventions vary between series.
| Function | Typical Color |
|---|---|
| Excitation + | Red |
| Excitation − | Black |
| Signal + | Green |
| Signal − | White |
| Shield / Drain | Bare |
The mV/V output connects to a digital indicator, signal conditioner, or PLC analog module. For applications requiring 4–20 mA or 0–10 V output, use a load cell transmitter between the sensor and the controller.
For multi-sensor systems or when combining a single-point cell with other sensors, a junction box may be used. However, most single-point applications use one cell connected directly to one indicator.
Typical 4-wire wiring for a single-point load cell. Confirm colors with the model datasheet.
Applications
Single-point load cells are used wherever compact, cost-effective platform weighing is required. The off-center tolerance makes them especially suited to applications where load placement varies or cannot be precisely controlled.
- Retail and industrial bench scales: Counter scales, pricing scales, postal scales — where compact footprint and legal-for-trade certification are needed.
- Checkweighers: In-line production weighing to verify package fill weight, reject underweight or overweight products, and collect SPC data.
- Packaging machines: Filling, sealing, and labeling equipment with integrated weighing for batch control and quality verification.
- Ingredient batching and dosing: Recipe batching, filling systems, and loss-in-weight feeders for food, pharmaceutical, and chemical processing.
- OEM weighing modules: Embedded inside medical devices, laboratory instruments, vending machines, and automated dispensing systems where the sensor is a hidden component.
- Counting scales: High-resolution models support the division count required for parts counting and inventory management.
- Small conveyor belt scales: Compact conveyor weighing with short weigh zones mounted under the belt frame.
Related: Packaging Automation · Production Automation · Manufacturing · Medical Devices
Certifications & Accuracy Classes
Select Transcell single-point models carry OIML R60 and NTEP certifications for legal-for-trade applications. Certification determines the number of scale divisions (nmax) and the accuracy class.
- OIML R60 C3: Supports up to 3,000 verification intervals — the standard requirement for commercial and retail scales.
- NTEP (U.S.): Certificates of Conformance for legal-for-trade use in commercial weighing. Check individual model pages for NTEP certificate numbers.
- RoHS compliance: Available upon request for models integrated into electronics or exported to regulated markets.
For applications that do not require legal-for-trade certification — such as process control, OEM integration, or internal quality checks — general-purpose models provide comparable accuracy at a lower cost. Transcell also offers calibration services with traceable test data for verification and compliance documentation.
CAD Files, Drawings & Engineering Resources
Transcell provides engineering documentation to support fast integration:
- 2D dimensional drawings (PDF) for mounting and envelope verification
- 3D CAD models (STEP format) for direct import into SolidWorks, Inventor, or Creo assemblies
- Load direction diagrams confirming the active measurement axis
- Wiring color-code tables for each series
CAD files are available on individual product pages or by request from Transcell engineering. For custom cable lengths, connectors, or modified configurations, see OEM services.
Mechanical drawing and 3D CAD model for a Transcell single-point load cell.
OEM & Custom Integration
Transcell supports OEM customers who embed single-point load cells inside their own equipment — packaging machines, medical devices, vending systems, automation fixtures, and custom platform scales. Transcell’s OEM engineering scope includes:
- Application review: capacity, platform geometry, duty cycle, and safety factors
- Indicator and transmitter recommendations for the target control architecture
- Custom cable lengths, connectors, and harness configurations for production lines
- Private labeling and branded documentation
- Long-term supply agreements and lifecycle planning for high-volume programs
- Cross-reference guidance for replacing competitor models (Tedea, HBM, Rice Lake, NMB, Celtron, Scaime, Sensortronics)
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Single-Point Load Cell FAQs
What is a single-point load cell?
A bending-beam strain-gauge sensor designed so that one cell supports an entire platform and maintains accuracy under off-center loading within the rated platform size.
What platform size can I use?
Each model has a rated maximum platform size specified on the datasheet. Exceeding it degrades off-center accuracy. Common maximums range from 250 × 350 mm to 400 × 400 mm depending on model and capacity.
When should I use a multi-cell shear beam system instead?
When the platform exceeds the single-point model’s rated size, or when capacity requirements exceed ~1,000 kg. A four-cell shear beam system with a junction box handles larger platforms and heavier loads.
Are Transcell single-point load cells certified for legal-for-trade use?
Select models carry OIML R60 C3 certification and NTEP Certificates of Conformance. Check the individual product page for the model’s certification status.
Aluminum or stainless steel?
Aluminum for dry, indoor, cost-sensitive applications. Stainless steel for washdown, food processing, outdoor, or chemically aggressive environments. See the material comparison table above.
Can I replace a competitor’s single-point load cell with a Transcell model?
In many cases, yes. Transcell FAK, FAS, FAV, and FAY series are cross-compatible with popular models from Tedea, HBM, Rice Lake, NMB, Celtron, and Scaime. Contact us with the current manufacturer, model, capacity, and mounting dimensions for evaluation.
Are CAD files available?
2D PDF drawings and 3D STEP files are available on product pages or by request from the Transcell engineering team.
Need Help Specifying a Single-Point Load Cell?
To receive a recommendation from the Transcell engineering team, provide:
- Platform dimensions (length × width)
- Maximum load on the platform
- Environment (indoor/outdoor, washdown, temperature range)
- Required accuracy or certification (OIML class, NTEP, general purpose)
- Output and controls interface (indicator model, PLC type, required output format)
- Volume and timeline (prototype, production, blanket order)
Our engineering team will recommend the appropriate single-point family, mounting hardware, and instrumentation for your application.
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