Phase Rotation Meter with Easy-to-Read Arrow and Non-Metallic Contact Clips for 70 V to 600 V Lines

Hioki’s non-contact voltage detection and measurement technology places efficiency and safety as priority considerations with the goal of protecting customers that need to conduct on-site electrical work as part of renovations and expansions of manufacturing plants and buildings. Model PD3129 is a non-contact phase rotation meter that detects the phase of electrical current flow within insulated wires without using metallic contact voltage clips. The green arrow indicates normal phase, which can be useful for visual reports that document the proper completion of electrical work.


How to use the Hioki Phase Detector PD3129/PD3129-10

Introducing safe, contactless phase detection! This video introduces the Phase Detector PD3129/PD3129-10, which provides visual and aural notification of detection results.

Key Features

  • Simply clip clamps onto wire insulation
  • Green LED arrow clearly shows phase direction, perfect for visual reports
  • Rotating LED indicator shows the phase sequence for a 3-phase power supply at a glance
  • Intermittent beeps signal positive phase; continuous tone signals reverse phase
  • Magnetic base allows the instrument to be secured on a distribution panel

Model No. (Order Code)


Easy-to-understand detection of normal phase with lit arrow

The arrow in the center of the instrument turns green to indicate normal phase. In this way, normal phase can be recognized at a glance. In addition, the arrow shows up clearly in photographs, making the PD3129 ideal for documenting proper installation in end-of-project reports.
(Photo: 3129-10)

Safe, no-metal-contact design

The PD3129 uses no-metal-contact clips that need only be clipped to the outside of each insulated wire, allowing phase to be detected safely.
(Photo: 3129-10)

Magnetic back for maximum work efficiency

Four magnets on the back of the instrument allow it to be secured in place on distribution panels. By leaving your hands free for other tasks, this feature dramatically boosts work efficiency.
(Photo: 3129-10)

Basic specifications

Functions Phase detection (positive and negative)
Voltage detection method Static induction
Voltage range 70 to 600 V AC (50/60 Hz) (sine wave,continuous input)
Frequency range 45 Hz to 66 Hz
Object to be connected 2.4 mm (0.09 in) to 17 mm (0.67 in) of insulated wiring
Display Phase detection :Positive ; 4 LEDs lit in clockwise order and the buzzer sounds intermittently, green arrow lights up
Negative ; 4 LEDs lit in counterclockwise order and the buzzer sounds continuously
Battery check function Power ON lamp: lights up (Power ON), blinks (Battery LOW)
Auto power off Auto shut off if no activity is detected after power is turned ON for 15 minutes
Power supply R6P (AA) manganese battery ×2, Continuous use: 70 hr
Dimensions and mass 70 mm (2.76 in)W × 75 mm (2.95 in)H × 30 mm (1.18 in)D, 200 g (7.1 oz), Cord length : 0.7 m (2.30 ft)
Included accessories Carrying case ×1, Strap ×1, Spiral tube ×1, Instruction manual ×1, R6P (AA) manganese battery ×2

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