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Model 786LF Series Extremely Low-Frequency Accelerometer

Brand: Wilcoxon Sensing Technologies
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Wilcoxon’s 786LF series delivers clear signals at low frequency, low vibration levels. The low frequency series has superior performance down to 0.1 Hz. The sensors are optimized with extended low-end frequency response and improved signal-to-noise ratio compared to other general-purpose models. The sensors are designed with unique circuitry helping prevent washover distortion, a condition that can occur when both high amplitude, slow and fast frequencies are present.

The 786LF series can be used for detecting vibration on slow turning machinery such as cooling tower fans and slow-speed gearboxes.
Features
  • High sensitivity
  • Extended low end frequency response
  • Clear signals at low vibration levels
  • Low frequency performance
  • Hermetically sealed
  • ESD-protected
  • Reverse wiring protection
  • Manufactured in an approved ISO 9001 facility
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Wilcoxon’s 786LF series delivers clear signals at low frequency, low vibration levels. The low frequency series has superior performance down to 0.1 Hz. The sensors are optimized with extended low-end frequency response and improved signal-to-noise ratio compared to other general-purpose models. The sensors are designed with unique circuitry helping prevent washover distortion, a condition that can occur when both high amplitude, slow and fast frequencies are present.

The 786LF series can be used for detecting vibration on slow turning machinery such as cooling tower fans and slow-speed gearboxes.
Features
  • High sensitivity
  • Extended low end frequency response
  • Clear signals at low vibration levels
  • Low frequency performance
  • Hermetically sealed
  • ESD-protected
  • Reverse wiring protection
  • Manufactured in an approved ISO 9001 facility
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Specifications

Brand

Approvals & Certifications

  • CE

Electrical Connectors

  • Cable [J10 / J9T2A, < 100 feet (30 metres)]
  • Mating Connector: R6 Typical
  • Output Connector: 2-Pin, MIL-C-5015 Style

Enclosure, Body Material

  • 316L Stainless Steel

Frequency

  • Frequency Response (± 10 %): 0.25 to 8,000 Hz (12 to 480,000 CPM)
  • Frequency Response (± 3 dB): 0.10 to 13,000 Hz (6 to 780,000 CPM)
  • Frequency Response (± 5 %): 0.35 to 5,000 Hz (18 to 300,000 CPM)
  • Resonance Frequency, Mounted, Nominal: 30 kHz

Mounting

  • 1/4-28 UNF Tapped Hole

Noise

  • Electrical Noise, Equivalent G (Broadband: 2.5 Hz to 25 kHz): 250 µg RMS - Model 786LF-500
  • Electrical Noise, Equivalent G (Broadband: 2.5 Hz to 25 kHz): 350 µg RMS - Model 786LF-250
  • Electrical Noise, Equivalent G (Broadband: 2.5 Hz to 25 kHz): 400 µg RMS - Model 786LF
  • Electrical Noise, Equivalent G, Nominal (Spectral: 10 Hz): 4.0 µg/√Hz - Model 786LF-250
  • Electrical Noise, Equivalent G, Nominal (Spectral: 10 Hz): 5.0 µg/√Hz - Model 786LF
  • Electrical Noise, Equivalent G, Nominal [Spectral: 10 Hz (Model 786LF-500), 100 to 1,000 Hz (Model 786LF, 786LF-250)]: 3.0 µg/√Hz

Non-Linearity

  • Amplitude Non-Linearity: 1 %

Output Impedence

  • Maximum 100 to 300 Ω

Power Requirement

  • 18-30 Vdc
  • Current Regulating Diode: 2-10 mA

Range

  • Acceleration Range, Vdc > 22 V: 10 G Peak - Model 786LF-500
  • Acceleration Range, Vdc > 22 V: 20 G Peak - Model 786LF-250
  • Acceleration Range, Vdc > 22 V: 50 G Peak - Model 786LF

Sensitivity

  • Base Strain Sensitivity, Max.
  • Electromagnetic Sensitivity, Equivalent G, Max.
  • Sensitivity, ± 10 %, 25° C (77° F): 100 mV/g - Model 786LF
  • Sensitivity, ± 10 %, 25° C (77° F): 250 mV/g - Model 786LF-250
  • Sensitivity, ± 10 %, 25° C (77° F): 500 mV/g - Model 786LF-500
  • Transverse Sensitivity: Max. 5 % of axial

Shock

  • Shock Limit: 5,000 G Peak

Temperature Range

  • -50° to 120° C (-58° to 248° F)

Vibration

  • Vibration Limit: 500 G Peak

Voltage

  • Bias Output Voltage: 13 Vdc
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