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The UNI-T UT-CS09D is a professional-grade flexible AC current clamp sensor designed to solve the common challenge of measuring high currents in tight or hard-to-reach spaces . Unlike traditional rigid clamp meters, this sensor features a lightweight, flexible Rogowski coil that can wrap around large conductors, busbars, or densely packed wiring without requiring direct contact or circuit disconnection .
This innovative accessory transforms a standard multimeter or oscilloscope into a powerful high-current measurement tool, capable of safely and reliably measuring AC currents up to 3000A . With its CAT IV 600V safety rating and international certifications (CE, UKCA, cETLus), the UT-CS09D is the preferred choice for professional electricians, maintenance technicians, and industrial engineers working in high-voltage environments .
Extremely High Current Capacity: Measures AC current from 1.5A up to 3000A across three selectable ranges
Flexible Rogowski Coil Design: 45.7cm (18-inch) flexible coil wraps around large conductors and fits into tight spaces where rigid clamps cannot reach
Universal Compatibility: Can be connected to any multimeter with AC millivolt (mV) input or specifically to UNI-T UT206B/UT208B meters for direct current display
BNC Adapter Included: Comes with BNC adapter for easy connection to oscilloscopes
Three Measurement Ranges: Selectable 30A, 300A, and 3000A ranges with corresponding voltage output
Robust Safety Rating: CAT IV 600V certified for use on primary power distribution systems
Durable Construction: 1-meter drop-proof design with robust terminal connections
Visual Low Battery Indication: POWER LED flashes when battery voltage drops below approximately 3.3V
The UNI-T UT-CS09D delivers professional-grade accuracy across a wide range of current measurements.
The UT-CS09D utilizes Rogowski coil technology—a specialized electromagnetic coil wound on a flexible air-core former . When placed around a conductor carrying alternating current, the coil produces a voltage signal proportional to the rate of change of current. This signal is then integrated by the sensor's internal circuitry (dual-integration design) to produce an output voltage that accurately represents the AC current waveform .
Key advantages of Rogowski coil technology:
No Saturation Effect: Unlike traditional iron-core CTs, Rogowski coils do not saturate under high currents, ensuring linear performance up to 3000A
Exceptional Linearity: Maintains accuracy across the entire measurement range
Lightweight and Flexible: The air-core design eliminates heavy iron, making the coil flexible and easy to position
Safe Open-Circuit Operation: Can be operated with the secondary open without dangerous voltage buildup
| Item | Quantity |
|---|---|
| UNI-T UT-CS09D Flex Clamp Sensor | 1x |
| BNC Adapter (for oscilloscope connection) | 1x |
| English User Manual | 1x |
| AAA Batteries (1.5V R03) | 3x (check seller; some listings exclude batteries) |
The UNI-T UT-CS09D is widely used across multiple industries :
Monitoring high-voltage lines in substations and switchyards
Measuring current on transformers, circuit breakers, and busbars
Troubleshooting motors, drives, and control panels
Measuring current on welding equipment and heavy machinery
Verifying power supply current on base stations and communication equipment
HVAC system current measurement on compressors and large fans
Elevator and escalator maintenance
Data center PDU (Power Distribution Unit) monitoring
Commissioning new electrical installations
Verifying load currents during plant start-ups
Troubleshooting in tight electrical rooms where rigid clamps won't fit
The UT-CS09D features auto-ranging capability when used with specific UNI-T multimeter models, automatically identifying the function range and scale for direct current display :
The sensor can be connected to any multimeter or oscilloscope with AC millivolt (mV) input capability using the included output leads or BNC adapter . Simply set your meter to the appropriate mV range and use the following conversion:
| Range Setting | Output Ratio | Example |
|---|---|---|
| 30A range | 100mV corresponds to 1A | 250mV = 2.5A |
| 300A range | 10mV corresponds to 1A | 250mV = 25A |
| 3000A range | 1mV corresponds to 1A | 250mV = 250A |
Compatible with any multimeter featuring:
AC millivolt (mV) measurement function
BNC input (with included adapter) or standard test lead inputs
| Feature | UT-CS09D Flex Sensor | Traditional Rigid Clamp Meter |
|---|---|---|
| Maximum Current | 3000A AC | Typically 600-1000A |
| Jaw/Coil Type | Flexible 45.7cm coil | Rigid fixed jaw |
| Conductor Size Capacity | Up to large busbars (fits around any shape) | Limited by jaw opening (typically 30-50mm) |
| Access in Tight Spaces | Excellent - coil bends around obstacles | Poor - requires space to open jaws |
| Weight | Lightweight (260g) | Varies (typically 200-400g) |
| Safety Rating | CAT IV 600V | Varies (typically CAT III) |
| DC Current Measurement | No (AC only) | Some models support DC |
| Standalone Operation | No (requires multimeter) | Yes (all-in-one) |
The UT-CS09D is designed with safety as a priority, but proper usage is essential :
CAT IV 600V Rating: Suitable for measurements on primary supply levels, but always follow local safety regulations
Ensure Power is Off Before Connection: Whenever possible, de-energize circuits before attaching the flexible coil
Wear Appropriate PPE: Always use insulated gloves and protective equipment when working near live high-voltage conductors
Inspect Before Use: Regularly check the coil, cable, and connections for damage or wear. Do not use if insulation is compromised
Avoid Strong Magnetic Fields: External magnetic fields can affect measurement accuracy
Operating Environment: Use only within specified temperature (0°C to 50°C) and humidity ranges
Battery Maintenance: When the low battery indicator (flashing POWER LED) appears, replace all three batteries promptly to ensure accurate measurements
Proper Storage: Store in a dry, ventilated area when not in use
The UT-CS09D stands out as a specialized solution for high-current measurement in challenging environments. Its flexible Rogowski coil design addresses the limitations of traditional rigid clamp meters, allowing professionals to measure currents on large conductors, awkwardly positioned cables, or densely packed busbars that would otherwise be inaccessible .
With a 3000A capacity, CAT IV 600V safety rating, and international certifications, this sensor brings laboratory-grade measurement capability to the field . The included BNC adapter adds oscilloscope compatibility, making it a versatile tool for both troubleshooting and detailed waveform analysis .
Whether you're a utility engineer monitoring substation feeders, an industrial maintenance technician troubleshooting motor drives, or a facility manager verifying data center power distribution, the UNI-T UT-CS09D delivers the flexibility, safety, and performance required for professional electrical work.
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