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
The above description encapsulates the entire product series. Specifications for individual configurations may vary depending on the selection chosen.
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Selected Configuration

Model #:

Model 786LF Series

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Configuration

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Agency Approvals

  • CE

Temperature Range

  • -50° to 120° C (-58° to 248° F)

Sensitivity

  • Base Strain Sensitivity, Maximum: 0.0002 g/μstrain
  • Electromagnetic Sensitivity, Equivalent g, Maximum: 70 µg/gauss
  • 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 Maximum: 5% of Axial

Non Linearity

  • Amplitude Nonlinearity: 1%

Vibration

  • Vibration Limit: 500g Peak

Shock

  • Shock Limit: 5,000g Peak

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)

Power Requirement

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

Output Impedence

  • Maximum 100 Ohms - Model 786LF
  • Output Impedance, Maximum: 200 Ohms - Model 786LF-250
  • Output Impedance, Maximum: 300 Ohms - Model 786LF-500

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

Electrical Connectors

  • Mating Connector: R6 Type
  • Output Connector: 2-Pin, MIL-C-5015 Style

Voltage

  • Bias Output Voltage: 13 Vdc

Mounting

  • 1/4-28 UNF Tapped Hole

Enclosure/Body Material

  • 316L Stainless Steel

Noise

  • 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 (Broadband: 2.5 Hz to 25 kHz): 400 µg rms - Model 786LF
  • 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): 250 µg rms - Model 786LF-500