Parallel Beam Weighing Sensor CZL629

Product Introduction

Parallel beam load cells are force-sensitive detection elements based on the strain-resistive principle, with a double parallel beam or single parallel beam elastomer as the core structure. When subjected to force, the bending deformation of the beam drives the strain gauge to produce a resistance change, which is then converted into a standardized electrical signal. They combine advantages such as high precision under light loads, planar anti-off-center load capacity, and convenient installation, and are widely used in small-range weighing, planar force, and embedded measurement scenarios. The following provides a detailed explanation from the core dimensions to meet the needs of product selection, technical evaluation, and solution writing:

1. Product Features and Functions

Core Features

• Structural Design: Adopts an integrated parallel beam structure (beam thickness 2-15mm, length 20-150mm), with uniform stress distribution concentrated in the middle section of the beam, supporting multi-angle forces in the plane, and featuring outstanding anti-off-center load capacity (able to withstand planar off-center loads of ±20%-±30% of the rated load), with no obvious stress blind spots.

• Precision Performance: Accuracy levels cover C1-C3, with mainstream models reaching C2. Nonlinearity error ≤±0.01%FS, repeatability error ≤±0.005%FS, zero drift ≤±0.002%FS/℃, and better precision performance than similar sensors in small-range scenarios of 0.1kg-500kg.

• Materials and Protection: The elastomer commonly uses aluminum alloy (for lightweight scenarios), alloy steel (for general industrial scenarios), or 304/316L stainless steel (for corrosive scenarios), with the surface treated by anodizing, nickel plating, or passivation; the protection level is typically IP65/IP67, and food-grade models can reach IP68, suitable for various complex environments.

• Installation Compatibility: Standardized mounting holes (threaded holes or smooth holes) are provided at the bottom, supporting bolt fixing or adhesive installation. Some miniature models can be installed in an embedded manner, suitable for the narrow installation space of desktop weighing instruments and automated equipment, and a single unit can meet planar weighing requirements.

Core Functions

• Light Load Force Measurement: Focuses on static/quasi-dynamic light load weighing (response time ≤4ms), with a range covering 0.1kg-500kg, and typical applications concentrated in the 1kg-200kg range. Miniature models can achieve ultra-small range measurement of 0.01kg.

• Multiple Types of Signal Output: Provides analog signals (4-20mA, 0-3V, 0-5V) and digital signals (RS485/Modbus RTU, I2C). Miniature intelligent models integrate signal conditioning modules and can be directly connected to single-chip microcomputers and IoT modules.

• Safety Protection Function: Integrates wide temperature range temperature compensation (-10℃~70℃), has overload protection (150%-200% of the rated load, usually 150% for aluminum alloy models), and some models include anti-shock buffer structures.

• Long-Term Stability: Fatigue life ≥10⁷ cycles of load, with annual drift ≤±0.01%FS under rated load, suitable for long-term continuous operation scenarios such as supermarkets and laboratories.

2. Core Problems Solved

• Insufficient Precision in Light Load Scenarios: Aiming at the problem of excessive error of traditional sensors in small-range scenarios below 10kg, through optimized design of beam stress, the measurement error is controlled within ±0.005%FS, solving the problems of food weighing, drug countingHigh-precision requirements such as quantity.

• Inaccurate measurement of planar eccentric load: The uniform stress distribution characteristic of the parallel beam structure can effectively offset the influence of eccentric load caused by the offset of the weighing object, solving the accuracy problem of non-fixed material placement positions in desktop weighing instruments and sorting equipment.

• Difficulties in equipment integrated installation: The compact structure and flexible installation method solve the embedded installation requirements of automated equipment and smart home appliances, without the need to modify the main structure of the equipment, reducing integration costs.

• Poor adaptability to multiple environments: Through material and protection level upgrades, problems such as sensor damage and signal drift in scenarios such as humidity (e.g., aquaculture weighing), corrosion (e.g., chemical reagent weighing), and dust (e.g., flour processing) are solved.

• Cost pressure on small equipment: A single sensor can meet the planar weighing requirements, eliminating the need for multiple sensors to be used in combination. At the same time, the aluminum alloy material reduces the product weight and cost, solving the cost control problem of small weighing instruments and consumer electronics.

3. User Experience

• Extremely simplified installation: Standardized mounting holes and positioning reference surfaces eliminate the need for professional calibration tools. Installation can be completed with an ordinary screwdriver, with low flatness requirements (≤0.1mm/m), and a single person can complete debugging within 10 minutes.

• Low operation threshold: Supports one-key zeroing and single-point calibration of weighing instrument meters (only requires a standard weight of 100% of the rated load). Digital models can be quickly calibrated through computer software, and non-professionals can easily operate them.

• Extremely low maintenance cost: The fully sealed structure reduces the intrusion of dust and moisture, with an annual average failure rate ≤0.2%; the aluminum alloy model is light in weight (minimum only 5g), easy to replace, and does not require disassembly of large structures during maintenance.

• Accurate data feedback: Static measurement data fluctuation ≤±0.003%FS, no hysteresis in quasi-dynamic scenarios; digital models come with zero drift compensation function, eliminating the need for frequent calibration, with strong data stability.

• Good integration adaptability: The micro model is small in size (minimum size 20mm×10mm×5mm), can be embedded inside smart devices without affecting the device's appearance design; signal output is compatible with mainstream small controllers, plug and play.

4. Typical Application Scenarios

1) Civil and Commercial Light Load Weighing Instruments

• Supermarket pricing scales/electronic platform scales: The core sensing unit of 3-30kg pricing scales, with lightweight design of aluminum alloy material. The anti-eccentric load characteristic ensures consistent weighing accuracy at different placement positions, with an error ≤±1g.

• Express delivery electronic scales: 1-50kg express delivery weighing equipment, made of stainless steel for easy cleaning and anti-fouling, with IP67 protection level suitable for the humid and dusty environment of express delivery outlets, supporting fast and continuous weighing.

• Kitchen scales/baking scales: 0.01-5kg high-precision kitchen scales, with micro parallel beam sensors achieving milligram-level accuracy. Digital signal output is compatible with high-definition displays, meeting the requirements for accurate ingredient proportioning.

2) Industrial Automation Equipment

• Automated sorting equipment: Weight sorters in the food and hardware industries, installed under the sorting conveyor belt, detect product weight in real time and link with the sorting mechanism, with sorting accuracy up to ±0.1g.

• Material detection on assembly lines: Material shortage detection on electronic component assembly lines, determining whether materials are missing through weighing (e.g., mobile phone battery assembly), with a response time ≤4ms is suitable for high-speed pipelines.

• Quantitative control of packaging machines: Quantitative weighing for small particle/powder packaging machines, with C2 accuracy models ensuring the weight error per bag ≤ ±0.2%, meeting metrological standards.

3) Food and pharmaceutical industries

• Weighing of pharmaceutical ingredients: Weighing of small-dose raw materials (0.1 - 10kg) in the pharmaceutical industry, with 316L stainless steel material + GMP certification, surface polished without dead corners for easy disinfection and sterilization, accuracy ≤ ±0.01%FS.

• Weighing of aquatic products/meat: Cutting and weighing equipment in slaughterhouses and aquatic product markets, with waterproof and anti-corrosion design (IP68), can be directly washed, suitable for humid and water-rich working environments.

4) Scientific research and experimental equipment

• Weighing in biological experiments: Weighing of reagents and samples in laboratories, ultra-small range models (0.01 - 1kg) can meet the high-precision requirements of microbial culture and chemical reagent proportioning.

• Force measurement in medical equipment: Force/weight measurement of rehabilitation equipment (such as handgrip dynamometers) and medical scales (baby scales), with lightweight aluminum alloy design to improve equipment portability, accuracy up to ±0.005%FS.

5) Intelligent consumer electronics and IoT devices

• Smart home appliances: Detection of laundry weight in washing machines and weighing of coffee bean bins in coffee makers, with micro-embedded sensors enabling intelligent control of equipment and enhancing user experience.

• IoT end points: Weight monitoring of smart shelves and smart trash cans, low-power digital models supporting NB-IoT wireless transmission, suitable for IoT remote management scenarios.

5.Usage Instructions (Practical Guide)

1)Installation Process

• Preparation: Clean the installation surface (remove oil stains and burrs), check the appearance of the sensor (no deformation of the beam body and no damage to the cable), select the appropriate mounting bolts according to the range (avoid using high-strength bolts for aluminum alloy models).

• Positioning and Fixing: Horizontally install the sensor on the load-bearing surface, ensure that the load acts vertically above the beam body (avoid lateral impact); use a torque wrench for bolt tightening (5 - 10N·m for aluminum alloy models, 10 - 20N·m for alloy steel), prevent over-tightening from damaging the beam body.

• Wiring Specifications: For analog signals, follow "red - power +, black - power -, green - signal +, white - signal -", for digital signals, connect according to the pin definition; avoid pulling the cable when wiring for micro models, it is recommended to reserve 5cm of redundant length.

• Protection Treatment: In a humid environment, seal the cable connector with waterproof tape, and clean the sensor surface promptly after use in the food industry to avoid corrosion by residual materials.

2) Calibration and Debugging

• Zero Calibration: Turn on the power and preheat for 10 minutes, execute the "zero calibration" command, ensure that the zero output is within ±0.001%FS, if the deviation is too large, check if the installation surface is flat.

• Load Calibration: Place a standard weight equivalent to 100% of the rated load (use standard weights for small range scenarios), record the output signal value, correct the error through the meter or software, ensure that the error ≤ the allowable value of the corresponding accuracy level (C2 level ≤ ±0.01%FS).

• Eccentric Load Test: Place the same weight at different positions on the load-bearing surface of the sensor, observe the consistency of the readings, the deviation should ≤ ±0.02% FS, otherwise the installation level needs to be adjusted.

3) Daily maintenance

• Regular inspection: Clean the sensor surface every week, check the wiring for looseness every month; calibrate the supermarket balance every quarter, and calibrate the laboratory equipment every month.

• Fault handling: Check the power supply voltage first when the data drifts (stable at 5-24V DC, usually 5V for micro models); check for overload when the reading is abnormal (aluminum alloy models are prone to permanent deformation due to overload), and replace the sensor if necessary.

6. Selection method (precise matching of requirements)

1)Core parameter determination

• Range selection: Select according to 1.2-1 times the actual maximum weight (such as a maximum weight of 10kg, optional 12-14kg sensor), avoid insufficient accuracy caused by too large range in light load scenarios.

• Accuracy level: Laboratory/medicine chooses C1 level (error ≤ ± 0.005% FS), industrial metrology chooses C2 level (error ≤ ± 0.01% FS), civil weighing instruments choose C3 level (error ≤ ± 0.02% FS).

• Signal type: Civil weighing instruments choose analog signal (0-5V), intelligent devices choose digital signal (I2C/RS485), and IoT scenarios choose models with wireless modules.

2) Environmental adaptability selection

• Temperature: For regular scenarios (-10 ℃~ 60 ℃), choose the regular model; for low-temperature refrigeration scenarios (-20 ℃~ 0 ℃), choose the low-temperature resistant model; for high-temperature scenarios (60 ℃~ 80 ℃), choose the high-temperature compensation type.

• Medium: For dry environments, choose aluminum alloy; for humid/food industries, choose 304 stainless steel; for chemical corrosive environments, choose 316L stainless steel.

• Protection level: For indoor dry environments, ≥ IP65; for humid/flushing environments, ≥ IP67; for underwater or highly corrosive environments, ≥ IP68.

3)Installation and system compatibility

• Installation method: For desktop scales, choose bolt fixing; for smart devices, choose embedded installation; for space-limited scenarios, prioritize micro models with a length ≤ 30mm.

• Compatibility: Confirm that the power supply voltage and signal type of the sensor match the controller. For micro models, check the pin definition to avoid wiring errors and burning the module.

4) Additional requirement confirmation

• Certification requirements: FDA/GMP certification is required for the food and pharmaceutical industry, CMC certification is required for measurement scenarios, and OIML certification is required for export products.

• Special functions: For high-speed sorting, choose a model with a response time of ≤ 3ms; for low-power scenarios, choose an IoT model with a sleep current of ≤ 10μA; for hygiene scenarios, choose an integrated model without threads or dead corners.

Summary

the parallel beam weighing sensor has the core advantages of "light load high precision, flat anti-bias load, and convenient integration". The core solution is to solve problems such as precise weighing of small ranges, material bias load, and embedded installation of equipment. User Experience focuses on simple operation, worry-free maintenance, and controllable cost. When selecting, the four core requirements of range, accuracy, installation space, and environment should be given priority, and system compatibility and additional function decisions should be combined. During use, overload and lateral impact should be avoided, and regular calibration specifications should be strictly followed to ensure long-term stable operation. It is suitable for light load weighing instruments, automation equipment, food and medicine and other fields, and is the optimal sensing solution for small range and flat weighing scenarios.

Detail Display

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