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S453 Microhmmeter 220A

  • Current Output: Up to 220 A DC (8 coarse gears + 87 fine steps at 2.5 A/step)

  • Resolution & Range: 0.01 µΩ resolution across 1 µΩ ~ 3.5 Ω dynamic range

  • Measurement Accuracy: ±(0.1% rdg + 0.2% range + 1 µΩ) at 30 A ~ 220 A

  • Battery & Power: Built-in 12.6 V / 9000 mAh rechargeable lithium battery

  • Portability & Screen: Handheld 2.2 kg chassis with 5.6-inch color LCD

  • Data & Safety: 999 records auto-storage, Bluetooth App Excel export & overheat protection


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Product Description

Measuring contact resistance and joint conductivity in high-voltage circuit breakers, disconnectors, and busbar connections is essential for identifying contact surface oxidation or loosening, thereby preventing localized thermal rise and potential equipment failure during service.

 

  • The S453 Portable 220A Micro-ohmmeter measures contact resistance across circuit breakers, SF6 switchgear, transformer bus connections, and metallic joints with test currents up to 220 A and resolution down to 0.01 µΩ.

  • Current & Range Versatility: Offers 8 coarse steps (≤5A to 220A) and 2.5 A fine adjustment across 87 levels, spanning 1 µΩ to 3.5 Ω with high accuracy across 30A~220A ranges.

  • Four-Wire Kelvin Sensing & Safety: Utilises true 4-wire Kelvin sensing to substantially mitigate lead and contact errors. Integrated thermal monitoring and automatic open-circuit protections safeguard equipment and personnel under heavy-duty testing.

  • Cordless Portability & Data Export: Powered by an internal 12.6V / 9000mAh lithium battery, the 2.2 kg handheld unit operates independently of substation AC supply. Stores up to 999 records and supports wireless Excel export via Android Bluetooth App alongside USB PC logging.

  • Application Scope: Suited for Factory Acceptance Testing (FAT), on-site commissioning, routine preventive maintenance, and fault diagnosis in power transmission and distribution systems.


Technical FAQ
Does a portable micro-ohmmeter meet the current requirements of international standards such as IEC 62271-100 for circuit breaker testing?
Yes. International standards for high-voltage circuit breakers and switchgear (such as IEC 62271-100 and IEEE C37.09) specify applying a DC test current of at least 100 A to measure main contact resistance. A 220A portable micro-ohmmeter provides selectable coarse outputs including 100 A, 200 A, and 220 A, fulfilling standard requirements while offering higher test current to overcome surface contact resistance during factory acceptance testing and site commissioning.
Can a battery-powered 220A contact resistance tester replace traditional heavy benchtop units for all-day field testing?
Traditional high-current micro-ohmmeters often weigh 15 kg to 30 kg and rely strictly on external AC generators or grid power. In contrast, an integrated battery-powered contact resistance tester houses a 12.6 V / 9000 mAh rechargeable lithium pack inside a compact 2.2 kg handheld chassis. Designed to cover routine on-site inspection tasks on a single charge and supporting the energy-efficient Rapid test mode, it allows testing engineers to move freely across remote substations, overhead platforms, and bucket trucks without pulling long mains extension cables.
How does the 2.5 A fine-step current adjustment benefit testing across different substation equipment beyond circuit breakers?
Unlike instruments limited to fixed current outputs, this unit provides 8 coarse gears (≤5 A, 10 A, 30 A, 50 A, 80 A, 100 A, 200 A, 220 A) alongside 2.5 A fine-step tuning across up to 87 levels. This flexibility allows users to apply high currents (such as 100 A to 220 A) on heavy-duty switchgear, while fine-tuning output to lower levels for smaller busbar joints, cable terminations, metallic welds, and conductors across a wide 1 µΩ to 3.5 Ω dynamic range, helping avoid excessive thermal rise on smaller test specimens.
What built-in safety protections and on-site accuracy checks does the instrument provide for field operation?
The instrument complies with IEC 61010-1 safety specifications and CAT III 600V ratings. It incorporates open-circuit protection and temperature-monitored overheat protection. If a test lead disconnects or test loop contact is poor, the device identifies the condition and discontinues current output. Under prolonged continuous high-current operation, internal temperature monitoring triggers a high-temperature prompt and halts output to safeguard internal components. Furthermore, each unit is supplied with a dedicated standard reference resistor, enabling operators to perform a quick self-test in the field before testing mission-critical assets.
What options are available for data recording, report generation, and customer handover in field testing?
The instrument offers multi-tier documentation options: internally, it automatically records up to 999 test data sets with cyclical storage. For immediate paper handover, an optional external thermal printer outputs test slips on site for witness sign-off. For paperless workflows, the built-in Bluetooth interfaces with an Android smartphone application to view live measurement parameters, assign equipment numbers, and export standardized Excel (.xlsx) reports. For extended logging or laboratory analysis, the unit connects to PC software via USB for second-by-second continuous data acquisition.