Mass Comparator: Driving Precision Measurement Upgrades, Domestic Substitution is the Right Time

In the field of metrology, weights serve as the core medium for transferring mass values and are fundamental reference standards in the calibration and verification of weighing instruments and the traceability system of mass measurement. The weight comparator, as a key supporting device for weight verification, plays a crucial role in transmitting national primary mass standards down to working measuring instruments. From provincial metrology research institutes to municipal, district, and county-level metrology stations, and from statutory metrological verification institutions to third-party testing laboratories, the weight comparator is an essential precision instrument in the development of modern metrological systems.
Shenyang Longteng Electronics Co., Ltd., established in 1990, is one of the earliest manufacturers in China to produce electronic balances. The company independently develops and manufactures mass comparison instruments using advanced electromagnetic force sensor technology, featuring digital direct display, fast weighing, high precision and stability, and automatic calibration. Fully domestically produced, these products are protected by independent intellectual property rights. They meet the verification requirements for F1, F2, M1 and lower-grade weights, and have proven their excellent performance through successful applications in precision weighing fields such as aerospace. These instruments are an ideal choice for replacing imported equipment and achieving high-precision autonomous metrology.

Advanced technology, covering full-scale calibration requirements
Shenyang Longteng's balance weights comparator product line is comprehensive, covering full-scale verification requirements from milligram to ton-level quantities. The F1-grade series ranges from 20kg/0.01g to 5g/0.001mg, meeting the requirements for high-precision weight value transmission; the F2-grade series covers 20kg/0.02g to 1g/0.02mg, suitable for routine metrological calibration applications; the M1-grade and lower series further include verification of large-mass weights ranging from 1g to 20kg, 50kg, 100kg, 200kg, up to 1000kg and 2000kg. The company is a leading domestic manufacturer of comparators for hundred-kilogram and ton-level heavy weights. For comparators with specifications of 10kg to 25kg and above, the company has specially equipped safety stop devices along with manual or electric loading/unloading mechanisms, effectively preventing impact errors caused by manual handling of large weights, significantly improving verification accuracy, reducing labor intensity, and avoiding damage resulting from lifting and dropping heavy weights.
The mass comparator differs fundamentally from a conventional electronic balance — it features high resolution and excellent repeatability, primarily used for comparing the masses of standard weights and test weights with high precision to deliver accurate comparison results. Shenyang Longteng products are strictly designed and manufactured in accordance with JJG 99-2022 ”Weights” verification regulations and JJF 1326-2011 “Calibration Specification for Mass Comparators," ensuring that every device accurately transmits mass values.

Provincial, Municipal, District, and County Metrology Institutes: A Solid Backing for Precise Calibration
At the provincial-level metrology research institute, weight verification involves substantial workload and high precision requirements. Taking an automatic kilogram weight verification system as an example, the entire process — from customer submission, receiving at the dispatch room, fully automated testing in the laboratory, to final return—demands high performance in terms of device accuracy, stability, and efficiency. As a result, most provincial metrology institutes are equipped with advanced devices from Germany or Switzerland, which are highly expensive. However, municipal, district, and county-level metrology institutes, as well as third-party testing organizations, often lack the resources to fully equip themselves with such high-end foreign products. The Shenyang Longteng F1/F2-grade high-precision comparator, with excellent specifications such as 20kg/0.01g and 10kg/0.005g, meets the requirements for F1/F2-grade weight verification at municipal and county levels. Notably, it offers outstanding cost-effectiveness, enabling users to obtain a complete series of comparators at a low cost while still achieving reliable F1/F2 weight verification.
Municipal and district-level metrology institutes must strictly follow the JJG 99-2022 "Weighing Instruments" verification regulations when conducting work, systematically performing visual inspections and mass comparisons, and accurately completing data calculations. From meticulous examination of weight appearance and precise measurement of dimensional parameters, to accurate calibration of error values and standardized recording of verification data, every step requires continuous refinement. Shenyang Longteng offers a comprehensive product line of F2 and M1 grade comparators, providing precise selection options tailored to different range and accuracy requirements, ensuring compliance with verification procedures, data accuracy, and full traceability throughout the process for grassroots metrology institutions.
County-level metrology institutes and third-party testing organizations often face large quantities of weights with diverse specifications and heavy periodic verification workloads. Verification personnel need to organize weight records in advance, count quantities, verify serial numbers, and rationally plan verification spaces. The Shenyang Longteng product is simple to operate, stable and reliable, and offers excellent cost performance, effectively improving the efficiency of grassroots verification while reducing equipment procurement and maintenance costs. It serves as a powerful assistant for county-level metrology institutes and third-party organizations in conducting weight verification tasks.

Calibration of Large Mass Weights: From Challenges to Confident Handling
Calibration of large mass weights has always been a challenging issue in metrology. Imported large-scale comparators are expensive and lack safety stop mechanisms, resulting in high repair costs if damaged. Traditional electromagnetic balances are bulky, cumbersome to operate, and prone to frequent malfunctions. The Shenyang Longteng M1-grade series of mass comparators offers a complete solution ranging from 50 kg to 2000 kg: ES-50M (50 kg/0.2 g), ES-100M (100 kg/0.5 g), ES-200M (200 kg/1 g), as well as ES-1000M/S (500 kg/2 g, 1000 kg/5 g) and ES-2000M/S (1000 kg/5 g, 2000 kg/10 g), fully covering the calibration needs for large mass weights. For calibration of ton-level M1-grade weights, a safety stop device is integrated. When ton-level weights are lowered onto the platform using cranes or forklifts, they are securely supported by fixed brackets, ensuring that no damage occurs to the balance regardless of impact force. During weighing, pressing a button or remote control gently lowers the weighing platform into position, enabling measurement. This design ensures both safety and reliability while improving measurement accuracy. The use of high-resolution mass comparators combined with the direct weighing method has proven to be an effective and feasible technical approach.

Domestic substituton is timely,with policy benefits continuing to unfold.
The "Key Points of National Metering Work for 2026" clearly states the need to "implement the major special project on market supervision equipment renewal and further promote the enhancement of capabilities in metrological reference standards and metering verification devices." Against the backdrop of comprehensive upgrades to metrological reference standards, the strategic value of domestically advanced metering instruments is becoming increasingly evident. The Shenyang Longteng weight comparator features advanced technology, robust durability, and outstanding cost-effectiveness, making it an ideal choice for responding to national equipment renewal policies and achieving import substitution. Widely used in metrology institutes and third-party testing organizations at provincial, municipal, district, and county levels, as well as in metrology laboratories of large and medium-sized industrial and mining enterprises, this instrument plays a crucial role in weight mass transfer and is an indispensable precision metering device for modern metrology and laboratory development.
Choosing Shenyang Longteng means choosing precision, reliability, and efficiency. Shenyang Longteng Electronics Co., Ltd. will continue to contribute to the high-quality development of China's metrology industry with its core electromagnetic force sensor technology accumulated over thirty years.