Load Sensor (Load Cell) for LMI Systems | Specifications & Selection

Product Specifications

Technical details and manufacturing context for Load Sensor (Load Cell)

Definition

A load sensor, commonly referred to as a load cell, is a critical component within a Load Moment Indicator (LMI) system. It measures the actual load or force applied to a structure, such as a crane boom or lifting apparatus, providing the primary input data for calculating the load moment to ensure safe operation and prevent overload conditions. The sensor operates on the principle of strain gauge technology: when a force is applied, the internal element deforms slightly, changing the electrical resistance of bonded strain gauges. This change produces a proportional output voltage or current signal, calibrated to represent the applied load. Load cells are available in various configurations and materials, including alloy steel, stainless steel, and aluminum alloy, to suit different environmental and mechanical requirements. Key parameters to consider when selecting a load cell include rated capacity (0.5–200 t), accuracy class (C3–C6 per OIML R60), nonlinearity (±0.02–±0.05 %FS), hysteresis (±0.02–±0.05 %FS), repeatability (±0.01–±0.03 %FS), creep over 30 minutes (±0.02–±0.05 %FS), excitation voltage (5–12 V DC), bridge resistance (350–700 Ω), insulation resistance (≥5000 MΩ at 50 V DC), operating temperature range (-40–85 °C), temperature effect on zero and span (±0.02–±0.05 %FS/10K), ingress protection (IP65–IP68 per IEC 60529), and material (e.g., 17-4PH stainless steel per ASTM A693). These values are directory reference ranges; actual specifications must be confirmed with the manufacturer for the specific model and application. The load cell's output is typically connected to a signal conditioner or indicator that displays the load and integrates with the LMI system. Proper installation, calibration, and regular verification are essential for accurate and safe operation. Overloading beyond the rated capacity, exposure to extreme temperatures outside the specified range, or physical damage can lead to performance degradation or failure. Maintenance signals include erratic readings, zero drift, or nonlinear output, which may indicate the need for recalibration or replacement. Always consult the manufacturer's documentation and verify compliance with relevant standards for your specific use case.

Working Principle

The load sensor operates based on strain gauge technology. When a force is applied, the sensor's internal element deforms slightly. This deformation changes the electrical resistance of bonded strain gauges, producing a proportional change in output voltage or current signal that is calibrated to represent the applied load. The output signal is typically in millivolts per volt (mV/V) and requires signal conditioning to be converted into a readable load value. The sensor's design ensures that the deformation is within the elastic limit of the material, allowing for repeatable and accurate measurements.

Common Materials

Alloy Steel, Stainless Steel, Aluminum Alloy

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Capacity	0.5–200 t	Select based on max applied load with safety factor.
Accuracy Class	C3–C6	C3 typical for industrial scales; C6 for high precision.OIML R60
Nonlinearity	±0.02–±0.05 %FS	Lower value indicates better linearity.
Hysteresis	±0.02–±0.05 %FS	Difference in output for same load during loading and unloading.
Repeatability	±0.01–±0.03 %FS	Consistency of output under repeated identical loads.
Creep (30 min)	±0.02–±0.05 %FS	Output change under constant load over 30 minutes.
Excitation Voltage	5–12 V DC	Recommended range for stable operation.
Bridge Resistance	350–700 Ω	Common values: 350, 700; affects signal conditioning.
Insulation Resistance	≥5000 MΩ	At 50 V DC; ensures electrical safety.
Operating Temperature Range	-40–85 °C	Beyond this range, performance may degrade.
Temperature Effect on Zero	±0.02–±0.05 %FS/10K	Change in zero output per 10K temperature change.
Temperature Effect on Span	±0.02–±0.05 %FS/10K	Change in sensitivity per 10K temperature change.
Ingress Protection	IP65–IP68	IP68 for submersible applications.IEC 60529
Material	17-4PH	Stainless steel for corrosion resistance.ASTM A693

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Elastic Element (Spring Element) Part
Deforms elastically under applied load, transmitting strain to the gauges.

Material: Alloy Steel
Strain Gauges Part
Bonded to the elastic element; change resistance proportionally to strain.

Material: Constantan or Karma foil
Sealing & Housing Part
Protects internal components from environmental factors like moisture, dust, and chemicals.

Material: Stainless Steel or Aluminum
Cable & Connector Part
Transmits power (excitation) to the sensor and carries the output signal back to the indicator.

Material: Copper, PVC/Neoprene insulation

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Load Sensor (Load Cell).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Load Moment Indicator (LMI)

View system integration details

Manufacturers of Load Sensor (Load Cell)

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

HK LEE HING INDUSTRY CO., LIMITED

Guangdong, CN

Also makes: Spray Nozzle, Probes

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the typical rated capacity range for load sensors?

The rated capacity range for load sensors is typically 0.5 to 200 tons, as listed in the directory. The actual capacity should be selected based on the maximum applied load with an appropriate safety factor, and must be confirmed with the manufacturer for the specific application.

What accuracy classes are available for load sensors?

Load sensors are available in accuracy classes C3 to C6 according to OIML R60. C3 is typical for industrial scales, while C6 is used for high-precision applications. The required class depends on the measurement accuracy needed for your specific use case.

What materials are load sensors made of?

Common materials include alloy steel, stainless steel, and aluminum alloy. For corrosion resistance, stainless steel grades such as 17-4PH (per ASTM A693) are often used. The material choice affects durability and suitability for different environments.

How should I verify the performance of a load sensor?

Verify performance by checking parameters such as nonlinearity, hysteresis, repeatability, and creep against the manufacturer's datasheet. Ensure the sensor is calibrated and tested under conditions similar to your application. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Not applicable (load cells measure force, not fluid pressure)
other spec:	Maximum Load Capacity: 0-100% of rated capacity, Overload Protection: Typically 150% of rated capacity, Environmental Protection: IP65/IP67 common for industrial use
temperature:	-40°C to +85°C (typical industrial range, varies by model)

Load Sensor (Load Cell)

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards