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China Xian Ruijia Measurement Instruments Co., Ltd.
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Xian Ruijia Measurement Instruments Co., Ltd.
Xian Ruijia Measurement Instruments Co., Ltd. में सेंसर का एक पेशेवर निर्माता हैराज्य स्तरीय उच्च तकनीक उद्योग विकास क्षेत्र, शीआनवर्ष 2005 से हम दबाव सेंसर, वजन सेंसर आदि के विकास और उत्पादन पर ध्यान केंद्रित कर रहे हैं।                                                               Xian ruijia के पास प्रथम श्रेणी की तकनीकी टीम है, जिसमें मजबूत आर एंड डी क्षमता और उत्पादन प्रबंधन में समृद्ध अनुभव है। उत्पादन लाइन में,हमारे पास उत्पाद की गुणवत्ता और विश्वसनीयता सुनिश्चित करने के लिए सबसे उन्नत और पूर्ण उपकरण सेट हैं.   सियान रुजियाहमारे पेशेवर और तकनीकी कर्मियों द्वारा डिजाइन किए गए हमारे उन्नत परीक्षण उपकरण के सॉफ्टवेयर और हार्डवेयर को एक साथ लाता है।हमने राष्ट्रीय पेटेंट कार्यालय से कई उपयोगिता साधन पेटेंट प्राप्त किए हैं।.   हम ग्राहकों को किफायती, उच्च गुणवत्ता वाले उत्पाद प्रदान करते हैं। एशिया के लाभ प्राप्त करने के लिए, गुणवत्ता और लागत के मामले में पूर्ण लाभ,जर्मनी और संयुक्त राज्य अमेरिका से प्रमुख घटकों की खरीद, और चीन में उत्पादन और विनिर्माण. हम चीन में सबसे अच्छा आपूर्ति श्रृंखला और भागों निर्माताओं है, और गुणवत्ता और नवाचार का एक ठोस रिकॉर्ड है,साबित करने के लिए कि हमारे कई वर्षों के प्रदर्शन के सेंसर.     गुणवत्ता उत्पाद प्रदर्शन और अच्छी प्रतिष्ठा, हमारे उत्पादों को न केवल चीन में सफल बिक्री कर रहे हैं, और सहित दुनिया में 50 से अधिक देशों और क्षेत्रों के लिए निर्यात किया गया हैः जर्मनी,जापान, इटली, रूस, जापान, दक्षिण कोरिया, तुर्की, ब्राजील, भारत, संयुक्त अरब अमीरात, सऊदी अरब और अन्य देशों में, उत्पादों का बहुत स्वागत और प्रशंसा की जाती है।   भविष्य की ओर देखते हुए, कंपनी विकास की तेज पटरी में आगे बढ़ रही है और वैश्विक ग्राहकों की सेवा के लिए गुणवत्तापूर्ण उत्पाद बनाने की अवधारणा का पालन करना जारी रखेगी।हमारा मिशन सबसे मूल्यवान और प्रतिस्पर्धी ऑटोमोटिवदुनिया में सेंसर।
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The selection of weighing sensors must pay attention to 5 major parameters 2025-10-01 The selection of weighing sensors must pay attention to 5 major parameters   When facing a detailed technical specification sheet of a load cell, the numerous parameters can indeed be overwhelming. Selecting a model is not just a simple parameter comparison, but a precise matching based on application requirements. This article aims to help you get straight to the point, clarify which parameters are the "critical points" that you must understand and focus on, and how to interpret the meaning behind them, so as to make a wiser choice and effectively distinguish the professionalism of suppliers. ### 1. Understanding Load Cell Parameters: Basic Concepts as a Bridge for Communication The core of "understanding" lies in demand matching: Indeed, you don't need to be a sensor design expert. But having a deep understanding of the core requirements of your own application (such as accuracy, range, environment, installation, service life, regulatory requirements, etc.) is a prerequisite. This enables you to ask precise questions when communicating with manufacturers and understand the rationality of their suggestions. **Value and Risk of Professional Manufacturers**: Relying on professional manufacturers is a wise move, but the word "professional" needs to be verified: - **Risk Points**: There are many salespeople in the market who have only a superficial understanding of technical details or make excessive promises. If you are completely unfamiliar with basic concepts, you are easily misled, leading to wrong model selection. At best, the accuracy is not up to standard; at worst, the sensor is overloaded and damaged, equipment shuts down, and even safety accidents are caused. - **Self - protection Strategy**: The subsequent "key parameter knowledge" in this article is your most powerful "shield" against being deceived. Being able to ask key questions (for example: "In a high - temperature environment, how is the temperature drift parameter guaranteed? ", "What is the OIML R60 error limit for this precision level? ") can quickly distinguish the professional depth of the other party. - **Verify Professionalism**: Require the manufacturer to provide model selection suggestions for your specific application scenario and explain the basis for their parameter selection; inquire about their production standards (such as whether they follow OIML R60, NTEP, etc.), calibration procedures, and quality control measures. ### 2. In - depth Analysis of Core Parameters of Load Cells: "Hard Indicators" That Must Be Looked at for Model Selection (1) **Accuracy - related Parameters**: The Golden Standard for Measuring "Accuracy" - **Nonlinearity**: The maximum deviation of the sensor's output curve from its ideal straight line. It reflects the quality of the sensor's "linearity" throughout the range. - **Repeatability**: The consistency of the sensor's output when loaded to the same load multiple times under the same conditions. It reflects the stability and reliability of the sensor. This is a very critical indicator for measuring the internal quality of the sensor. - **Hysteresis**: The maximum difference between the output values of the sensor during the loading process and the unloading process at the same load point. It reflects the energy loss of the sensor material or structure during the force application/unloading process. - **Clarification and In - depth Interpretation of User Misconceptions**: The one - sidedness of "the values are probably consistent": Although the values of these three errors in the specification sheet are often close or even the same (for example, all marked as ±0.02% F.S.), this is not an absolute rule, and it does not mean that they are the same concept. Excellent sensor design will strive to optimize these three indicators to make them all reach a high level and be balanced. The true meaning of accuracy grade: The comprehensive accuracy (Accuracy/Class) of a sensor is determined by these three core error items: nonlinearity, repeatability, and hysteresis (usually also including creep, zero - point temperature influence, sensitivity temperature influence, etc.). The accuracy grade on the specification sheet (such as C3, 0.03%) is a comprehensive indicator, representing the upper limit of the overall performance that the sensor can achieve under standard conditions. When checking the specification sheet, be sure to confirm whether the marked accuracy grade includes these core error items. How to "Understand" Accuracy: Look for "comprehensive accuracy" or "accuracy class": This is the most intuitive indicator. For example, "Accuracy: 0.05% F.S." or "Compliant with OIML C3 class". Check error components: If only single - item errors are listed (such as nonlinearity ±0.017% F.S., repeatability ±0.01% F.S., hysteresis ±0.02% F.S.), the comprehensive accuracy is usually equal to or slightly greater than the maximum value of these single - item errors. A more rigorous calculation requires reference to the formulas defined in relevant standards (such as OIML R60, EN 12640), and each error is synthesized in a specific way (usually Root Sum of Squares, RSS). Key to model selection: If your application requires an accuracy of ≤0.1% R.O., be sure to choose a sensor with a nominal comprehensive accuracy better than 0.1% F.S. (such as 0.05% or 0.03%). Because there are also additional errors introduced by installation, environment (temperature), signal processing, etc. in actual applications. Leaving a margin is the key to ensuring system accuracy. (2) **Capacity/Range**: The Cornerstone of Safety and Accuracy - **Selection Iron Law - Redundancy**: The 30% redundancy you mentioned is an industry consensus and best practice. For example, if the maximum weight to be measured is 1000kg, a sensor with a capacity ≥1300kg should be selected. - **In - depth Interpretation and Expansion**: - **Prevent Accidental Overload**: Material impact, operational errors, equipment vibration, etc., may cause the instantaneous load to exceed the design maximum. Redundancy is the last line of defense to prevent plastic deformation (permanent damage) of the sensor's core elastic body. - **Protect Measurement Accuracy**: When the sensor is close to its full range, errors such as nonlinearity and creep usually increase. The best performance can be obtained when operating within 70 - 80% of the range. - **Extend Service Life**: Avoid long - term operation under extreme stress to reduce fatigue damage. - **Dynamic Load Consideration**: If the application involves frequent impact or vibration (such as batching scales, dynamic weighing), a larger safety factor (such as 50% or even higher) is required, or a sensor specially designed for impact/dynamic response should be selected. - **Minimum Load**: Specifications often mark the minimum measurable load. If your application needs to measure very small weights (such as no - load or tare weight), pay attention to this parameter, as it is related to sensitivity and signal noise. (3) **IP Rating**: Armor Against the Environment - **Interpretation of IP Code**: IPXX (e.g., IP67) - The first digit (X): Solid foreign object intrusion grade (0 - 6). For example: 6 represents complete dustproof. - The second digit (X): Waterproof grade (0 - 9K). For example: 7 represents short - term immersion in 1m deep water without water ingress for 30 minutes; 8 represents continuous water immersion, and the depth and time are specified by the manufacturer; 9K represents the ability to withstand high - pressure/high - temperature water jet cleaning. ### Key Points for Model Selection: - **Matching the Environment**: Select an appropriate IP rating based on the dust, moisture, flushing (especially high-pressure and high-temperature flushing in food, chemical, and pharmaceutical industries), oil contamination, etc. at the sensor installation location. IP65/IP66 are basic requirements for common industrial environments; IP67/IP68/IP69K are strongly recommended for humid and flushing environments. - **Sealing Material**: Sensors with high protection ratings typically use special sealing rings (such as fluororubber FKMI) and sealing processes. Ask the manufacturer whether the sealing material can withstand possible chemical corrosion or high temperatures in your field. - **Cable Inlet**: The protection rating also includes the sealing at the cable inlet. Ensure that the selected cables and connectors (or potting treatment) can meet the same IP rating requirements. ### (4) Excitation Voltage and Rated Output/Sensitivity: The Source and Intensity of Signals - **Excitation Voltage (V exc)**: The input voltage supplied to the sensor bridge. The common range is indeed DC 5V - 15V (a typical value is 10V). ### Notes for Model Selection/Use: - **Matching the Instrument**: Ensure that the excitation voltage provided by your weighing instrument (or signal conditioner) is within the allowable range of the sensor. - **Stability Requirements**: The stability of the excitation voltage directly affects the stability of the output signal. The ripple of the excitation voltage provided by the instrument should be small. - **Power and Temperature Rise**: A higher excitation voltage can bring a larger output signal (with better signal-to-noise ratio), but it also means an increase in the internal resistance power consumption of the sensor, which may lead to an increase in temperature drift. In occasions with extremely high accuracy requirements, trade-offs need to be made (sometimes using constant current source excitation is also a solution). - **Rated Output/Sensitivity (Sensitivity/Rated Output - RO)**: Defined as the millivolt-level (mV) output change generated by the sensor per unit excitation voltage under the rated load (full range). The unit is mV/V. Values of 1 - 3 mV/V are most common (such as 2 mV/V). ### In - depth Interpretation and Calculation: - **Signal Magnitude Calculation**: Actual output signal (mV) = Excitation voltage (V) * Sensitivity (mV/V) * (Current load / Full - range load). For example: With 10V excitation, 2 mV/V sensitivity, and measuring 500kg (full range 1000kg), the output signal ≈ 10V * 2 mV/V * (500/1000) = 10 mV. - **Estimation of Minimum Detection Limit**: - **Sensor End**: Theoretically, the minimum weight change that a sensor can distinguish is limited by its noise level (it may be marked as "resolution" or "minimum static load output recovery" in the specification sheet, or reference to repeatability error may be required). - **High - sensitivity sensors** output larger signals under the same excitation, which helps improve the signal-to-noise ratio (SNR), thereby possibly distinguishing smaller weight changes. - **System End**: The minimum detectable weight of the actual system is determined by sensor noise + signal conditioning circuit noise + ADC resolution. - **Simplified Estimation Formula**: Min Detectable Weight ≈ (Comprehensive accuracy error % * F.S. * 1000) / (Sensitivity mV/V * Excitation voltage V * System gain * uV corresponding to ADC resolution). This requires knowing the details of the entire signal chain. - **A more practical approach**: Choose sensors with higher sensitivity (such as 2 mV/V or 3 mV/V) and excellent repeatability/noise indicators, and select high - resolution ADCs (such as 24 - bit) and low - noise amplifiers for the instrument. - **Matching Instrument Range**: The measurement range (mV input) of the instrument needs to cover the output signal range of the sensor under the maximum and minimum loads. Sensors with high sensitivity output larger mV under the same excitation and load, making it easier to match the input range of the instrument and make full use of the resolution of the ADC. ### (5) Other Key Parameters to Focus on as Needed - **Temperature Influence**: - **Zero Temperature Drift**: The change in the sensor's zero - point output when the temperature changes. The unit is usually %F.S./10°C. - **Sensitivity Temperature Drift**: The change in the sensor's sensitivity (output signal magnitude) when the temperature changes. The unit is the same as above. - **Key for Model Selection**: If the temperature change in the working environment is large (> ±10°C), these two parameters are crucial! Select sensors with small temperature drift coefficients (such as < 0.002% F.S./10°C), or confirm whether temperature compensation has been performed inside the sensor and whether the compensation range covers your working conditions (such as -10°C ~ +40°C). High - precision applications may require external temperature sensors for real - time compensation. - **Creep**: The amount by which the sensor output slowly changes over time under constant load and environment. The unit is %F.S./xx min (such as 30 min). It affects long - term weighing or process control. - **Material**: - **Elastic Body**: Alloy steel (economical and commonly used), stainless steel (corrosion - resistant, necessary for food and pharmaceutical industries), aluminum alloy (lightweight). Select according to environmental corrosiveness. - **Cable**: PVC (general - purpose), PUR (abrasion - resistant, oil - resistant), Teflon (high - temperature resistant, corrosion - resistant). Select according to mechanical wear, chemical contact, and temperature. - **Mounting Type**: Column type, cantilever beam type, S - type, shear beam type, bellows type, compression type, tension type, etc. It must match your mechanical structure and force - bearing method perfectly! Choosing the wrong mounting type will greatly affect accuracy and even cause damage. This is the top priority when communicating with the manufacturer's engineers. - **Safe Overload and Ultimate Overload**: After safe overload (such as 150% F.S.) and internal loading, the sensor performance should be recoverable; ultimate overload (such as 300% F.S.) is the load at which the sensor may suffer permanent damage. The redundancy is mainly aimed at safe overload. ### Summary and Golden Suggestions - **Demand is King**: Clearly define your application scenario (range, accuracy, environment, installation, regulations). - **Accuracy Core**: The comprehensive accuracy grade is the primary indicator. Understand that it is composed of nonlinearity, repeatability, hysteresis, etc. Ensure it is better than your system requirements. - **Range Iron Law**: Be sure to reserve a redundancy of ≥30%, and a larger redundancy is needed in dynamic impact environments. - **Protection Matching**: Select the IP rating according to the severity of the environment (IP65/IP66 for basic industry, IP67/IP68/IP69K for humid and flushing environments), and pay attention to the sealing material. - **Signal Foundation**: Understand the excitation voltage range and match it. Use the output sensitivity (mV/V) to estimate the signal magnitude and evaluate the minimum detection potential (combined with system noise and ADC). - **Environmental Adaptability**: Pay attention to temperature influence (zero - point and sensitivity drift) and material selection (corrosion resistance, wear resistance). - **Installation Matching**: The mounting type is the basis for physical implementation, so be sure to confirm it correctly. - **Professional Communication**: For special requirements (extreme temperature, strong corrosion, high dynamics, special installation, regulatory certification such as OIML/NTEP), unconfirmable parameters, or complex applications, be sure to have direct and detailed technical communication with the application engineers of the sensor manufacturer. Provide as many application details as possible.  
Cost Truth Analysis of Customized Weighing Sensors 2025-10-01 Cost Truth Analysis of Customized Weighing Sensors In the load cell industry, price formation is far from a simple arithmetic problem. It is a deep - seated game interwoven with supply - demand laws, value creation, and industry characteristics. To understand it, one needs to penetrate the surface of "cheapness" and洞察 (insight into) the commercial logic behind it. **The core of price: The dynamic balance of supply and demand?** Admittedly, the law of supply and demand is a basic principle in economics: an increase in demand leads to price rises that stimulate supply; excess supply causes price drops that inhibit production. This seems like a perfect closed loop. However, in the field of load cells, which is technology - intensive and has highly dispersed application scenarios, this closed loop is often complicated. Imagine a scenario: A customer needs to integrate a weighing function into a special container, but there is no ready - made solution on the market. He finds a reliable manufacturer and requests to customize a sensor that takes into account accuracy, safety, and installation adaptability. At this time, the supply - demand relationship is simply "1 customer vs 1 manufacturer". To meet this unique demand, a large amount of resources need to be invested: engineers repeatedly communicate to confirm the demand, conduct structural simulations, select special materials, design exclusive processes, make prototypes, and carry out strict environmental tests (such as temperature, impact, and long - term stability). Behind this are invisible R & D costs, time costs, and risk costs. The final price bears the "value creation" cost of solving specific problems, rather than just the cost of materials and basic processing. This price is a reasonable consideration for customers to pay for "from scratch" and "safe and reliable". **"Cheap" trap: When scale encounters the bottleneck of customization** After the customer uses the product with good results, small - batch orders follow. Due to the分摊 (allocation) of some early R & D costs, the unit price of small batches may decrease slightly. This is in line with the expectation of the scale effect. Subsequently, a larger order (such as 1000 units) comes, and the customer expects the price to drop significantly (for example, from 980 yuan to 580 yuan). After careful calculation, it is rejected - why? The key lies in the "customization" gene. This sensor of Shanghai Haojia Sensing was born to solve the problem of a specific container - a "special product". Its design, materials, processes, and testing standards are all optimized around that unique scenario. Forcing large - scale production cannot bring about an exponential cost reduction like the production of standard resistors. The special procurement of core components, complex manual assembly links, and still strict quality inspection requirements constitute insurmountable cost rigidity. At this time, the scale effect loses much of its magic in the face of highly customized products. Forcibly reducing prices often means sacrificing performance, reliability, or durability - these are precisely the lifelines of industrial load cells. Thus, the customer takes the sample to Manufacturer B, which offers a lower quotation. Manufacturer B may simplify the design, use more general materials, lower the testing standards, and even take on unknown risks to produce a "usable" sample. The customer places orders in batches, seemingly "succeeding in cost reduction". But is this really a victory? "Usable" does not equal "easy to use", let alone long - term "reliable" under complex working conditions. Once accuracy drift or structural failure occurs in actual application, leading to safety accidents or production line shutdowns, the losses will far exceed the cost saved by the sensor. We have witnessed too many cases: Customers are initially attracted by low prices and switch (to other suppliers), but eventually return to paying attention to reliability and technical support due to frequent failures, high after - sales costs, and brand reputation losses. If "cost reduction" is at the expense of core value, it will eventually cost a higher "price". **Differentiation Driven by the Market: Two Paths of Scale and Deep Cultivation** The market is surging forward. With the growth of end - demand, intensified competition, and the existence of downward price pressure, customers will also put pressure on upstream (such as sensor factories). The market's pursuit of profits is indeed as mentioned in the article: "If you don't do it, someone else will." This forces the industry to differentiate: - **Scale is King**: In a very small number of highly standardized fields with huge demand (such as core sensors for consumer electronic scales), large - scale production, improved automation, and high - degree supply chain integration can effectively reduce costs. Price becomes a core competitive factor, and the industrial cluster effect emerges. In such mature markets, competitiveness is maintained through lean production and efficient operation. - **Deep - plowing Value**: In a broader range of areas — industrial automation, precise grasping by robots, load balance of drones, formation detection of new energy batteries, safety monitoring of special equipment — demand is fragmented, customized, and highly demanding. Here, price is not the only weight in supply and demand; value is the way to survival, and it is precisely by focusing on this: - **Doing "Difficult but Right" Things**: Instead of pursuing to dominate all markets, we continue to innovate and deeply cultivate细分 (niche) scenarios. For example, we developed a high - precision online weighing module for coating battery pole pieces for a leading new energy company, solving the problem of stable milligram - level monitoring in high - temperature, high - dust, and strong - vibration environments, which has become the key to improving its yield rate. Although the price of such deep customization is high, the value it creates is irreplaceable. - **Building Technical Barriers**: Continuously invest in research and development in material science, compensation algorithms, structural optimization, and adaptability to extreme environments. Shanghai Dijia's patented sealing technology makes the service life of sensors in harsh environments such as food, medicine, and chemical industry far exceed that of competitors, and the total life - cycle cost of customers is actually lower. - **Providing Solutions Rather Than Just Hardware**: Understand customers' process pain points and provide overall solutions from sensor selection and installation guidance to data integration and analysis. This enhances customer stickiness and also makes the price bear richer service value. The fact is that the price of customized products first reflects the "value - creation" cost of solving unique problems, and the scale effect is limited. Blindly pursuing low prices may fall into the trap of performance and risk. Market differentiation is inevitable. Standardized fields compete on efficiency and cost; fragmented and highly demanding fields compete on innovation, reliability, and deep - seated services. Shanghai Dijia Sensing chooses and adheres to the latter. The customer's real cost is the "Total Cost of Ownership (TCO)", which includes procurement price, installation and commissioning fees, fault shutdown losses, maintenance costs, product/process upgrade costs, etc. A highly reliable, maintenance - free sensor that can improve the customer's core process level, even if the unit price is relatively high, its TCO is often more advantageous. For complex weighing needs in cutting - edge fields such as industrial automation, robots, drones, and new energy, we welcome dialogues with deep - seated value creators like Shanghai Dijia Sensing. We not only provide sensors but also strive to become your cornerstone partner for precise sensing and reliable control, jointly addressing challenges and creating core competitiveness that goes beyond price.
Weighing Sensor Selection Guide 2025-10-01 Weighing Sensor Selection Guide   In the process of looking for load cells and partners, people may have some questions. To provide you with some certainty, as a person in the industry, I would like to share what I have seen and known, hoping to help you avoid detours. 1. Which domestic brand of load cells is good? This question is as difficult to answer as "Which brand of mobile phone is the best". Our manufacturer often receives such inquiries. In fact, each brand has its own positioning and advantages. The domestic load cell market is indeed mixed. Some focus on the high - end market, with product accuracy reaching 0.02%; some focus on cost - effectiveness, suitable for occasions with low accuracy requirements; and some are traders, with uneven product quality. Our manufacturer knows best: there is no absolute good or bad, only what is suitable or not. Three suggestions for procurement: - First, clarify your core needs such as accuracy and range. - Require the manufacturer to provide third - party inspection reports. - Conduct on - site inspections of the production environment (good manufacturers welcome visits). Remember, what is suitable for others may not be suitable for you. Just like one of our customers, who had been using imported brands before, later found that our products could fully meet their needs, but the cost was reduced by 30%. 2. Domestic vs. Imported, how to choose? We have been asked this question for more than ten years. To be honest, now domestic high - end products are no worse than imported brands. Last year, we helped a listed company replace a German brand, with comparable performance and a delivery period shortened by 2 months. Key considerations: - Whether the technical parameters meet the standards. - Whether the cost - effectiveness is reasonable. - Whether the after - sales service is timely. There is a typical case: A certain food factory bought imported sensors at a high price, only to find that the working environment was very humid, and the imported sensors were not as durable as domestic waterproof ones. Therefore, suitability is the most important. ### 3. What kind of load cell is suitable? As a manufacturer, we believe that a good cooperation should meet three dimensions: 1. **Product dimension**: Accuracy, stability, and environmental adaptability. 2. **Service dimension**: Technical support, delivery cycle, and after-sales service. 3. **Cooperation dimension**: Communication efficiency and problem response speed. What we are most proud of is not how many products we sell, but how many practical problems we help customers solve. For example, last year, we customized an anti-impact force sensor for a logistics customer, reducing the failure rate from 15% to less than 1%. **Suggestions for purchasers**: - List the core indicators that must be met. - Evaluate the supplier's continuous supply capacity. - Examine the professionalism of the technical team. Finally, I would like to say that after being in this industry for so many years, we have found that the best cooperation is mutual achievement. Instead of spending time looking for the "best" one, it's better to find the one that understands your needs best. Our manufacturer is also more willing to cooperate with customers with clear needs in the long term, so that we can provide more accurate solutions.
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