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How to choose high-precision explosion-proof electronic scales? 5 key parameters to teach you how to avoid pitfalls
Date: 2025-11-22Read: 26
When selecting a high-precision explosion-proof electronic scale, it is important to focus on the five core parameters of explosion-proof level, accuracy and division value, range, sensor quality, and protection level. Combined with the comprehensive evaluation of usage scenarios and certification qualifications, the following is a specific analysis:
1、 Explosion proof rating: matching the core indicators of hazardous environments
Explosion proof level is the primary parameter for selecting explosion-proof electronic scales, and the corresponding level should be selected based on the hazardous medium (gas or dust) and area division (such as Zone 1/21, Zone 2/22) of the usage environment. Common explosion-proof types include:
1. Intrinsic safety type (Ex ia/ib): suitable for Zone 1 (persistent danger) or Zone 21 (dust environment) in explosive gas environments, achieving intrinsic safety by limiting circuit energy, such as in chemical raw material proportioning scenarios.
2. Explosion proof type (Ex d): suitable for Zone 2 (which may pose a danger) or Zone 22, isolating internal explosions through an outer shell, such as mine gas environment.
3. Composite type: Combining intrinsic safety and explosion-proof technology to adapt to more complex environments, such as pharmaceutical workshops with both gas and dust risks.
Avoiding pitfalls tips:If the equipment is labeled as "explosion-proof" but the level is not clearly defined or does not match the usage scenario (such as using intrinsic safety for Zone 2), there may be safety hazards.
2、 Accuracy and division value: the key to determining measurement accuracy
Accuracy directly affects the reliability of weighing results, and should be selected according to the application scenario:
1. High precision requirements: Chemical raw material proportioning, laboratory analysis and other scenarios require a precision of 0.01g level (such as division value d=0.01g) to ensure precise control of trace components.
2. General industrial requirements: For scenarios such as weighing goods and warehouse management, an accuracy of 0.1g~1g is sufficient. For example, the division value of an electronic scale with a range of 150kg is 50g.
3. Dividing value and verification dividing value: Dividing value (d) is the minimum scale actually displayed, and verification dividing value (e) is the benchmark for metrological verification. It needs to be confirmed that e ≤ d and complies with national metrological standards (such as OIML R76-1).
Avoiding pitfalls tips:Merchants may confuse "actual division value" with "calibration division value" and need to check product certificates or test known weight items to verify accuracy.
3、 Range: Covering daily needs with margin
The measuring range should be selected based on the maximum weight of the weighing item, and it is recommended to cover 120% of the daily maximum weighing to cope with sudden overload situations:
1. Small range: Laboratories, jewelry industry, etc. require a range of 0.1g~30kg, such as 6000g/0.01g explosion-proof electronic scales.
2. Medium to large range: Chemical, warehousing and other scenarios require a range of 30kg to 600kg, such as a 150kg explosion-proof electronic platform scale.
3. Ultra large range: Logistics, mining and other scenarios require ton level range, and dynamic explosion-proof electronic scales or weighing scales should be selected.
Avoiding pitfalls tips:A range that is too small may cause overload and damage to the sensor, while a range that is too large may reduce accuracy (such as weighing 1kg of an item with a 1-ton scale).
4、 Sensor quality: the core guarantee of stability
Sensors are the "heart" of electronic scales, and the following indicators should be considered:
1. Material and Craftsmanship: High quality sensors are made of stainless steel or aluminum alloy, which have anti fatigue and corrosion properties. For example, strain gauges detect weight through resistance changes.
2. Accuracy and stability: The internal resolution of high-precision sensors can reach over 2 million (such as 24 bit A/D converters), and the external resolution can reach one in 50000. Environmental interference is reduced through temperature compensation, linear compensation, and other technologies.
3. Brand and Certification: Choose sensor brands that have passed ISO9001 quality management system certification to ensure long-term stability.
Avoiding pitfalls tips:Low priced products may use inferior sensors, resulting in large fluctuations in weighing data or short lifespan. Stability can be verified by testing the same item multiple times.
5、 Protection level: a physical barrier that adapts to harsh environments
The protection level (IP code) indicates the device's ability to protect against external solids and liquids, and should be selected according to the usage environment:
1. IP65: Dustproof (Level 6) and anti low pressure water column splash (Level 5), suitable for humid or chemical splash environments, such as chemical workshops.
2. IP67: dustproof (level 6) and can be immersed in water for a short period of time (level 7), suitable for outdoor or frequent cleaning scenarios, such as food processing plants.
3. IP54: Dustproof (Level 5) and splash proof (Level 4), suitable for general industrial environments, but direct flushing should be avoided.
Avoiding pitfalls tips:If the device is labeled with IP65 but experiences frequent water ingress during actual use, there may be a problem of false labeling, and it is necessary to check the inspection report or test the waterproof performance.
Additional parameters: bonus points for functionality and authentication
1. Function extension: Select functions such as peeling, accumulating, counting, data recording, and connecting to computers or apps according to needs. For example, the automatic calibration function can reduce manual intervention and improve efficiency.
2. Certification qualifications: Ensure that the equipment has passed international explosion-proof certification (such as ATEX, IECEx, CNEx) and domestic measuring instrument license (CPA), avoiding legal risks caused by the use of unlicensed products.