Fluke ii915 Acoustic Imager (compressed-air leaks, partial discharges)

Acoustic camera with a microphone array that overlays a map of sound sources (SoundMap) on a visible-light image and pinpoints leaks or electrical discharges from distances of several tens of metres, without approaching energized or pressurized equipment. Measurements take seconds and do not require a shutdown.

Within the ii900 Series, the ii915 offers the broadest frequency range and longest working distance, plus two analysis modes in addition to leak detection: PDQ for classifying partial discharges (corona, surface, arcing and internal void discharges) using phase-resolved pulse data, and MecQ for identifying mechanical anomalies.

In substations and overhead traction systems, the camera detects partial discharges on insulators, cable terminations and switchgear; onboard, it locates leaks in pneumatic brake and door systems without removing covers. Frequency-band selection helps filter background noise in workshops or along the track.

Specifications (Fluke ii915, from the 2024 ii905/ii915 technical specifications):

• Acoustic array - 64 digital MEMS microphones
• Frequency range - 2 kHz to 100 kHz
• Working distance - 0.5 m to 120 m (depending on conditions)
• Field of view - 63° ±5°; 2608 × 1952 visible-light camera, 3× digital zoom
• Minimum sensitivity at 1 m - 3 dB SPL at 2 kHz, 6 dB SPL at 35 kHz, 36 dB SPL at 80 kHz
• Modes - LeakQ (leak assessment), PDQ (partial discharges), MecQ (mechanical anomalies)
• Display - 7-inch 1280 × 800 touchscreen LCD; 32 GB memory; video clips up to 5 min
• Li-ion battery - over 6 h operation, 4 h charging
• Operating temperature - –10 °C to +40 °C; IP40 rating
• Weight - 2.05 kg