HIOKI PD3129-10 Non-Contact Phase Detector | Insulated wire outer diameter φ7mm to 40mm, AC 70–1000 V, CAT IV 600 V／CAT III 1000 V, 200 h battery life

HIOKI (Japan) PD3129-10 Large-Diameter Non-Contact Phase Detector: Three-Phase Sequence Testing on Thick Cables Without Contacting Live Conductors

Overview

In high-voltage panel maintenance, new large three-phase motor installations and plant electrical inspections, the conventional method of touching live terminals with bare metal probes is cumbersome and carries a high risk of arc flash (Arc Flash) and electric shock. The genuine authorized HIOKI (Japan) product PD3129-10 digital non-contact phase detector is designed for large-diameter main feeders and safe field electrical diagnosis without shock risk.

It uses non-contact metal sensing: without stripping insulation or touching exposed metal terminals, simply clamp the three large clips onto the insulated wires (insulated wire outer diameter φ7mm to 40mm) to complete three-phase sequence detection (positive／reverse phase). Safety rating CAT IV 600V／CAT III 1000V, a field instrument for electricians, safety personnel and high-voltage power teams.

Key Technical Specifications

Large-Diameter Clips and Non-Contact Sensing

• Large clips for φ7mm to 40mm: Designed for thick high-voltage cables, feeder conductors and extra-large industrial wire sizes, solving the problem of small clips that cannot fit around main feeders.
• Measurement by clamping on insulation: Phase detection by clamping on the outer insulation of the wire, without contacting the metal conductor.
• Arrow LED flashing and buzzer alerts: In positive phase, a rapid intermittent beep sounds and green lights rotate clockwise; in reverse phase, the phase indicator goes out, the 4 rotation lights flash in reverse and a continuous tone sounds, allowing clear judgment even in dark or noisy machine rooms.

Visual Arrow Indicators and Protective Design

• Magnet on the back: A strong magnet built into the back holds the unit securely on steel panel doors, freeing the operator's hands for efficient one-person testing.
• Safety rating: CAT IV 600V／CAT III 1000V.
• Power: LR6×2, approx. 200 h continuous use, auto power-off after 15 minutes.

Applications

• Installation of large three-phase motors and drives: Confirming supply phase sequence to prevent large motors from running in reverse and burning out, avoiding costly equipment damage.
• High- and low-voltage panels and feeder work: Quickly confirming phase sequence by clamping directly on thick insulated cables, without opening terminal covers.
• Power acceptance in commercial buildings and power plants: Phase sequence confirmation on new feeder circuits; safety spot checks at high-voltage construction sites.