HIOKI Phase Sequence Testers – Safe Testing in Three-Phase Systems

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How do non-contact phase sequence testers improve safety?

Phase sequence testers – also referred to as phase rotation testers, phase indicators, or phase rotation meters – are essential tools for electricians, service technicians, and commissioning engineers. They verify the correct phase order, detect wiring errors, and help prevent equipment damage in three-phase networks.

All HIOKI phase sequence testers use non-contact voltage clamps. This measurement method allows measurements to be performed directly on insulated conductors without exposing live parts. Phase checks therefore become faster, safer, and possible even in situations where direct electrical contact would normally require higher qualifications or additional protective measures.

FT9847

FT9847 - Signal induction clamp

The Hioki FT9847 Signal Induction Clamp is a key accessory for the FT6041 Earth Tester, designed to inject measurement signals during two-clamp earth resistance tests. This clamp ensures efficient and accurate measurements when used with the FT6041. It supports signal injection through conductors up to 52 mm in diameter or busbars with dimensions of 78 mm × 20 mm. With a maximum input current of 1000 A (for 1 minute) and a rated current of 50 A, it is ideal for precise signal injection in field testing. Built for tough conditions, it operates in temperatures from −25°C to 65°C and offers IP40 protection during storage. Technical Information: Maximum input current: 1000 A (1 minute, 45 Hz to 128 Hz) Rated current: 50 A (45 Hz to 128 Hz) Measurable conductor diameter: 52 mm or less Cable length: 2 mOperating temperature: −25°C to 65°C Dust and water resistance: IP40 (storage condition)Safety category: CAT III 600 V / CAT IV 300 V Connector: 4 mm banana plug

€518.00*

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PD3129

PD3129 - Non-Contact Phase Rotation Tester for Three-Phase Systems

Phase sequence tester with non-contact voltage clips for phase order and live-line checks on three-phase circuits, fits insulated conductors with 2.4 mm to 17 mm diameter, CAT III 600 V

€218.00*

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PD3129-10

PD3129-10 - Non-Contact Phase Rotation Tester for Three-Phase Systems

Phase sequence tester with non-contact voltage clamps for phase sequence and live-line checks on three-phase circuits, fits insulated conductors with 7 mm to 40 mm diameter, CAT IV 600 V, CAT III 1000 V

€238.00*

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PD3259-50

PD3259-50 - Non-Contact Digital Phase Rotation Tester with Integrated Voltmeter

Digital phase sequence tester with voltmeter and non-contact clamps for safe checks of phase sequence, line-to-line voltage, frequency, and missing-phase detection; CAT IV 600 V, IP54, optional Bluetooth (Z3210 required).

€1,138.00*

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PD3259-90

PD3259-90 - Safe Non-Contact Phase Rotation Tester with True Voltage Measurement

Non-contact phase sequence tester with integrated voltmeter to check phase order, true lineto-line voltage, frequency, and missing-phase in three-phase systems, CAT IV 600 V, IP54, Bluetooth connectivity (Z3210 included)

€1,198.00*

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Product Comparison: Select your HIOKI Phase Sequence Detector

HIOKI offers a complete range from traditional non-contact testers for residential and small commercial sites to advanced digital meters with true voltage measurement and Bluetooth connectivity for industrial environments.

Comparison of non-contact phase rotation testers
Feature	PD3129 Non-contact Phase Sequence Tester (600 V)	PD3129-10 Non-contact Phase Sequence Tester (1000 V)	PD3259-50 Non-Contact Digital Phase Rotation Tester	PD3259-90 Non-Contact Digital Phase Rotation Tester (incl. Bluetooth)
Voltage range	70 – 600 V AC	70 – 1000 V AC	90 – 520 V AC	90 – 520 V AC
Safety rating	CAT III 600 V	CAT IV 600 V / CAT III 1000 V	CAT IV 600 V, IP54	CAT IV 600 V, IP54
Conductor diameter	2.4 – 17 mm	7 – 40 mm	6 – 30 mm	6 – 30 mm
Functions	Phase sequence, rotation, live-line check	Phase sequence, rotation, live-line check	Phase sequence, true line-to-line voltage, frequency, missing-phase detection	Phase sequence, true line-to-line voltage, frequency, missing-phase detection
Voltmeter included	No	No	Yes	Yes
Bluetooth	–	–	Optional (Z3210)	Included (Z3210)

Made in Japan – Built for Lasting Precision

All HIOKI phase sequence testers are designed in Japan and manufactured at our own R&D center and factories, ensuring the highest standards of precision, reliability, and lasting accuracy trusted by technicians worldwide.