Hioki CT7742 2000 A AC/DC Auto-Zero Current Sensor

Key Features At A Glance

• Rated measurement current from 100 A to 2000 A AC/DC across the CT7731, CT7736, and CT7742 models
• Maximum rated voltage to earth up to 1000 V AC/DC (CAT III) or 600 V AC/DC (CAT IV), depending on model
• AC/DC current sensing with a DC to 5 kHz (−3 dB) frequency band and 36.5 kHz sampling
• Hioki PL14 output connector for automatic sensor recognition on compatible instruments
• Auto-zero design reduces temperature-induced zero-point variability for continuous day-and-night measurement
• Operating temperature range of −25°C to 65°C at 80% RH or less, with no condensation
• 7.4 kV AC dielectric strength for 1 minute and a 3-year product warranty period

The Hioki CT7731, CT7736, and CT7742 are AC/DC Auto-Zero Current Sensors built around a Hioki PL14 output connector, which lets each sensor be automatically recognized when connected to a compatible instrument for simple setup. The design reduces zero-point variability caused by temperature, making the sensors well suited to applications characterized by temperature variations, such as continuous measurement spanning daytime and nighttime hours.

A clamp-on current sensor measures the current flowing in a conductor by closing its jaw around a single wire, without breaking the circuit. These sensors support a multiple-winding technique for low current levels: passing the conductor through the jaw multiple times increases relative sensitivity, where ten windings multiply the measured current by a factor of ten. When this technique is used, the windings should be made radially with a diameter of at least 20 cm. The most accurate measurement is obtained when the conductor is clamped in the center of the jaw.

ValueTronics stocks and holds its own inventory in a 20,000 square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois.

Compare Other Models in This Series

The CT7731, CT7736, and CT7742 form a family of AC/DC Auto-Zero Current Sensors that share a common architecture: a Hioki PL14 output connector for automatic instrument recognition, a DC to 5 kHz (−3 dB) frequency band, a 36.5 kHz sampling frequency, and an auto-zero design that limits temperature-induced zero-point drift. The three models differ primarily in rated measurement current and the size of conductor each jaw can accommodate.

All three carry a 3-year product warranty and a 3-year guaranteed accuracy period, and all are rated for operation from −25°C to 65°C at 80% RH or less. The choice between them is driven by the current to be measured, the conductor diameter, and the maximum rated voltage to earth appropriate to the circuit.

Each model below links to its own dedicated product page with new-condition pricing. Select the CT7731, CT7736, or CT7742 that matches your rated current and conductor-diameter requirements, and review that model's individual specifications before ordering.

The CT7731 is the 100 A AC/DC member of the family, with a 1 mV/A output rate and a 150 A peak rating. It accepts conductors up to φ33 mm, is rated to 600 V AC/DC (Measurement Category IV), and is the smallest and lightest of the three at approximately 58 × 132 × 18 mm and 250 g. Its offset drift between −25°C and 65°C is within ±0.5% f.s.

Rated measurement current steps from 100 A AC/DC on the CT7731 to 600 A AC/DC on the CT7736 and 2000 A AC/DC on the CT7742, with corresponding peak ratings of 150 A, 900 A, and 2840 A. Output rate is 1 mV/A on the CT7731 and CT7736 and 0.1 mV/A on the CT7742. The CT7731 and CT7736 accept conductors up to φ33 mm, while the CT7742's larger jaw accepts up to φ55 mm.

Maximum rated voltage to earth is 600 V AC/DC (Category IV) on the CT7731, 1000 V AC/DC (Category III) on the CT7736, and 600 V AC/DC (Category IV) on the CT7742. Offset drift is within ±0.5% f.s. on the CT7731 and within ±0.1% f.s. on the CT7736 and CT7742, and the effect of an external magnetic field (400 A/m, DC) tightens from ±1.5% f.s. on the CT7731 to ±0.5% f.s. on the CT7736 and ±0.2% f.s. on the CT7742. Mass increases across the family, from approximately 250 g on the CT7731 to 320 g on the CT7736 and 510 g on the CT7742. The comparison table below summarizes these per-model differences.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Accessories Supplied

• Instruction Manual
• Current Sensor Operating Precautions

Product Core & Specifications

Important: Attach the clamp around only one conductor; clamping single-phase (2-wire) or three-phase (3-wire) conductors together will prevent the device from making a measurement.

Important: This current sensor is an output device that must be connected to a compatible Hioki instrument via its PL14 output connector; it does not display readings on its own.

Important: Peak input measurement is only available in conjunction with the CM7290 Display Unit. For combination accuracy with the instrument, see the instrument's instruction manual.

Important: Initial zero-adjustment must be performed under no-input conditions before use; once performed, zero-point movement stays within the guaranteed range.

Important: Risk of electric shock from the conductor being measured increases when wet (Grip IP54 rating on CT7736/CT7742 applies only when measuring an insulated conductor).

Important: Be sure to also read the separate booklet "Current Sensor Operating Precautions" before use.

Recommended pairing: use the CM7290 Display Unit, which is required to enable peak input measurement with these sensors.

About this New unit

This is a brand-new, factory-sealed unit, supplied exactly as it arrives from the manufacturer and backed by the full manufacturer warranty. For the exact configuration, available options, included accessories, or current lead time for your application, our Test Architects can confirm the details before you order.

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.