AC156 Low-Frequency/High-Dynamic Accelerometer

The CTC AC156 Series is a cost-effective, side-exit IEPE accelerometer engineered to capture both ultra-low-speed vibration and high-frequency fault signatures in a single, rugged package. Delivering a sensitivity of 500 mV/g and an extended frequency span from 0.1 Hz to 10 kHz (±3 dB), it excels on large, slowly rotating assets such as main bearings and gearbox inputs while remaining sharp enough to detect early stage bearing or gear defects at ultrasonic ranges. A shear-mode PZT ceramic sensing element is hermetically welded inside a 316L stainless-steel housing, ensuring outstanding stability, corrosion resistance and submersible operation down to 60 m.

Designed for maintenance teams seeking dependable data at an economical price point, the AC156 combines CE-certified electromagnetic shielding, a 1,000 g shock limit and quick two-second settling time. Choose from three connector styles—2-pin MIL connector, integral CB103 cable, or armored CB2D6 cable—so the same sensor platform can be deployed from laboratory test rigs to harsh outdoor wind farms. Backed by CTC’s unconditional lifetime warranty, the AC156 is built to stay in service far longer than the equipment it monitors.

Key Features of the AC156 Accelerometer

  1. 500 mV/g high-output sensitivity for superior signal-to-noise on low-speed machinery
  2. Broad usable bandwidth: 0.1 Hz – 10 kHz (±3 dB) / 0.6 Hz – 3 kHz (±10 %)
  3. Dynamic range ±16 g peak with 1,000 g shock protection
  4. Shear-mode PZT design minimizes base-strain and thermal errors
  5. Hermetically welded 316L stainless-steel case, IP68-style; submersible to 60 m (200 ft)
  6. Quick 2 s power-up settling, 18–30 V DC IEPE compatible, 2–10 mA constant current
  7. Three wiring options:
     • AC156-1D – 2-pin MIL-C-5015 connector
     • AC156-2D – integral CB103 cable
     • AC156-3D – armored CB2D6 cable
  8. CE marked with ultra-low electromagnetic sensitivity
  9. Supplied with NIST-traceable calibration and lifetime unconditional warranty

Typical Applications for the AC156 Accelerometer

  • Monitoring low-rpm main shafts, pillow-block bearings and gearbox input shafts
  • Wind-turbine main bearings and blade pitch gearboxes
  • Hydro-electric turbine guide bearings and slow-speed generators
  • Paper-machine dryer cans, calender rolls and felt rolls
  • Cooling-tower fan drives and induced-draft fans
  • Marine propulsion shafts and thruster gearboxes
  • General condition-based maintenance where both low-frequency motion and high-frequency fault diagnostics are required

Technical Specification AC156

ParameterValueNotes
Sensitivity500 mV/g ±20 %80 mV/(m·s⁻²)
Frequency response (±3 dB)0.1 Hz – 10 kHz4–400,000 cpm
Frequency response (±10 %)0.6 Hz – 3 kHz36–180,000 cpm
Dynamic range±16 g peak157 m/s²
Resonant frequency18 kHz1,000,000 cpm
Spectral noise1.7 µg/√Hz @10 Hz; 0.2 µg/√Hz @100 Hz—
Power requirement18–30 V DC, 2–10 mA constant currentIEPE
Bias output10–14 V DC—
Output impedance≈100 Ω—
Temperature range−58 °F to +250 °F (−50 °C to +121 °C)—
Shock limit1,000 g peak9,810 m/s²
Case material316L stainless steelWelded, hermetic
Weight5.7 oz (162 g)Without cable
Mounting¼-28 UNF tapped hole (M8x1 adapter available)Torque 2–5 ft-lb (2.7–6.8 N·m)
Connector options2-pin MIL-5015, integral CB103, armored CB2D6Side exit
Environmental ratingSubmersible 60 m, CE compliantIP68-class sealing

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