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	7 cm
Loop length	25 cm
Degree of protection measurement loop	IP67
Battery operating time	300 Stunden

The flexible current transformer MiniFlex® MA110 from Chauvin Arnoux is a measuring instrument for non-invasive acquisition of alternating currents in industrial, energy, and technical applications. It is particularly suitable for measurements at hard-to-reach locations where a direct connection to the conductor is not possible. The measuring loop, due to its high flexibility and low mass, can be easily placed around conductors, cable bundles, or busbars. The device operates on the principle of a Rogowski coil, meaning no magnetic circuit is required – this prevents saturation effects and heating that can occur with conventional current transformers. The output is an alternating voltage, which is evaluated via a connected measuring instrument, such as a multimeter or power meter.

Applications

The MiniFlex® MA110 is used in various fields, including maintenance and repair services in industry, energy generation and distribution, transportation, and research and testing laboratories. It is suitable for harmonic analysis and power measurements, as it features low and constant phase shift. The bandwidth of 10 Hz to 20 kHz also makes it suitable for frequencies outside the mains frequency, for example, when examining power electronics or welding equipment.

Functions and Equipment in Detail

The device features four measuring 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 turns ratios are 1 V/A, 100 mV/A, 10 mV/A, and 1 mV/A, with a typical accuracy of ≤ 1 %. The measuring loop has an encircling diameter of 7 cm and a length of 25 cm. Additional variants with encircling diameters of 4.5 cm and 10 cm, as well as loop lengths of 17 cm and 35 cm, are available. The output signal is transmitted via a two-wire cable with two straight, insulated banana plugs Ø 4 mm.

Technology Explained Simply

The technology of the MiniFlex® MA110 is based on a Rogowski coil, which inductively detects current in a conductor. Since no magnetic saturation occurs, linearity remains high and phase shift is minimal. Power supply is either via two AA batteries (1.5 V) or externally via a µUSB Type-B connector with 5 V. Battery life is 300 hours. The protection rating of the measuring loop is IP67, meaning it is dust- and waterproof, enabling outdoor use. The housing has a protection rating of IP54. The safety category is 600 V CAT IV, ensuring high safety during measurements in electrical installations.

Compatibility and Accessories

The MiniFlex® MA110 can be connected to any measuring instrument that has an AC voltage input (mV AC / V AC) with banana plugs. Suitable accessories include a set of two adapters (BNC plug / 4 mm socket), Velcro straps (5 pieces), and a USB power adapter. These components allow flexible adaptation to various measuring instruments and operating conditions.

Mounting and Installation

Installation is performed by wrapping the flexible measuring loop around the conductor to be measured. The loop can also be placed in switch cabinets or distribution enclosures. Connection to the measuring instrument is made via the included cable with banana plugs. Power supply can be via batteries or externally via USB. The connection cables are insulated and designed for safe measurements.

Operational Advantages

The MiniFlex® MA110 offers high flexibility, as it can adapt to conductors of various shapes and sizes. The low phase shift enables precise power measurements. The long battery life of 300 hours reduces the need for maintenance. The IP67 protection rating of the measuring loop makes the device suitable for outdoor use. The combination of high bandwidth and low phase shift makes it particularly suitable for harmonic analysis and industrial applications.

Scope of Delivery

The scope of delivery includes the flexible current transformer MiniFlex® MA110, a connection cable with two straight safety banana plugs Ø 4 mm, the user manual, and two AA batteries.