General
Measurement ranges	0,08 A…3 A | 0,5 A…30 A | 0,5 A…300 A | 0,5 A…3000 A
Enclosure diameter	14 cm
Loop length	45 cm
Battery operating time	300 Stunden

The flexible current transformer AmpFlex® A110 from Chauvin Arnoux is a current measurement device for AC measurements with high flexibility and low weight. It enables easy encircling of conductors of various shapes and sizes, such as cables, busbars or cable bundles, thanks to its flexible measurement loop. The loop has an encircling diameter of 14 cm and a length of 45 cm, allowing even larger conductors or multiple conductors to be measured simultaneously. The device is designed for measurements from very low to high AC currents, with a maximum measurement range up to 30 kA. Measurement is performed using the Rogowski coil principle, which does not require a magnetic circuit, enabling flexibility and low weight. This eliminates magnetic saturation effects and heating, increasing measurement accuracy and device lifespan.

Functions and equipment in detail
The AmpFlex® A110 features four measurement ranges: 0.08 A to 3 A, 0.5 A to 30 A, 0.5 A to 300 A, and 0.5 A to 3000 A. The output signals are AC voltages with transformation ratios of 1 V/A, 100 mV/A, 10 mV/A, and 1 mV/A. Typical accuracy is ≤ 1 %. The bandwidth of 10 Hz to 20 kHz makes the device suitable for analysing industrial frequencies and harmonics. The low and constant phase shift enables precise power measurements. The device is powered by two AA batteries, providing a runtime of 300 hours, or alternatively by an external power supply with a µUSB Type-B connector (5 V). The housing features three LEDs indicating operating status: green LED for power supply, yellow LED for auto-shutdown (which can be disabled), and red LED for exceeding the measurement range.

Technology explained simply
The device operates on the Rogowski coil principle, where current measurement is based on induced voltage proportional to the rate of change of current. The measurement electronics in the housing convert the signal into a measurable output signal. Since no magnetic circuit is present, the device is flexible and lightweight. Output signals are transmitted via a two-wire cable with two straight, insulated banana plugs Ø 4 mm, which can be directly connected to multimeters, wattmeters or recorders. The IP67 protection rating for the measurement loop and IP54 for the housing ensure high protection against dust and water, allowing use even in outdoor environments. The safety category 1000 V CAT IV enables use in high-voltage installations.

Compatibility and accessories
The AmpFlex® A110 is compatible with a wide range of measuring instruments, including multimeters, wattmeters, recorders and power analysers equipped with an AC voltage input (mV AC / V AC). Available accessories include BNC plug/4mm socket adapters, opening clamps for AmpFLEX (black, 10 pieces), Velcro straps (5 pieces), and a USB power adapter. These components facilitate adaptation to various measurement environments and devices.

Mounting and installation
Installation is performed by simply encircling the conductor to be measured with the flexible loop. The loop can also be operated with safety gloves, thanks to the new plug system for opening and closing. The device is directly connected to the measuring instrument, with banana plugs securely and insulated. Power supply is either via the included AA batteries or via an external power supply with a µUSB connector.

Advantages in operation
The AmpFlex® A110 offers high flexibility and user-friendliness. The low phase shift enables precise power measurements. The error detection via the red LED when exceeding the measurement range increases safety. The long runtime of 300 hours on battery power and the option of external power supply make the device suitable for extended measurement campaigns. The IP67 protection rating and 1000 V CAT IV safety category extend the application range to demanding environments.

Application areas
The device is used in various fields, including industrial maintenance and repair services, energy generation, distribution and supply, transport sector (e.g. railway), research and testing laboratories, development departments, as well as testing organisations and authorities. It is suitable for single-phase and three-phase networks and can be used in residential buildings, service industries and industrial environments.

Scope of delivery
The scope of delivery includes the flexible current transformer AmpFlex® A110, a connection cable with two straight, insulated safety banana plugs Ø 4 mm, a user manual, and two AA batteries.