Low-frequency measurements for condition monitoring can present some of the biggest challenges for vibration detection. Applications typically include slow-speed agitators, wind turbines, cooling towers, semiconductor lithography, and seismic monitoring. Low-frequency measurements and low levels of acceleration are closely related, making the electronic circuitry critical to obtaining a good measurement. In order to have adequate voltage levels with high signal-to-noise ratio at the acquisition equipment, low-frequency accelerometers must have sensing elements with higher output than general purpose sensors. The low-end frequency cutoff of the amplifier is designed to offer clear signals down to < 0.1 Hz.

The 793L sensor is available classified by various testing agencies for usage where ignitable concentrations of flammable gases, vapors or liquids are present continuously under normal operating conditions. For proper protection the installation drawing must be followed.

Features:

  • High sensitivity
  • Ultra low-noise electronics for clear signals at low vibration levels
  • Low pass filtered to attenuate high frequencies
  • Hermetically sealed
  • ESD-protected
  • Reverse wiring protection
  • Manufactured in an approved ISO 9001 facility
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Agency Approvals

  • CE
  • CSA Class I, Div 1 Groups A, B, C, D
  • FM Class I, Division 1 Groups A, B, C, D, E, F, G; Class I, Division 2 Groups A, B, C, D, F, G; Class I, Division 3

Tests & Certificates

  • ISO 9001

Temperature Range

  • -50° to 120° C (-58° to 248° F)

Sensitivity

  • Base Strain Sensitivity, Maximum: 0.0001 g/μstrain
  • Sensitivity, ±5%, 25° C (77° F): 500 mV/g
  • Transverse Sensitivity: Maximum 5% of Axial

Non Linearity

  • Amplitude Nonlinearity: 1%

Vibration

  • Vibration Limit: 250g Peak

Shock

  • Shock Limit: 5,000g Peak

Range

  • Acceleration Range: 10 g Peak

Power Requirement

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

Output Impedence

  • Maximum 100 Ohms

Frequency

  • Frequency Response (-10%): 0.4 to 1,000 Hz
  • Frequency Response (-3 dB): 0.2 to 2,300 Hz
  • Frequency Response (-5%): 0.6 to 700 Hz
  • Resonance Frequency: 15 kHz

Electrical Connectors

  • Cable (J9T2A)
  • Mating Connector: R6 Type
  • Output Connector: 2-Pin, MIL-C-5015 Style

Voltage

  • Bias Output Voltage: 10 Vdc

Circuit Protection

  • ESD Protection
  • Reverse Wiring Protection

Mounting

  • 1/4-28 Tapped Hole

Enclosure/Body Material

  • 316L Stainless Steel

Element

  • Sensing Element Design: PZT, Compression

Seal Type

  • Hermetic

Noise

  • Electrical Noise, Equivalent g, Nominal (Spectral: 1,000 Hz): 0.2 µg/√Hz
  • Electrical Noise, Equivalent g, Nominal (Spectral: 100 Hz): 0.4 µg/√Hz
  • Electrical Noise, Equivalent g, Nominal (Spectral: 2 Hz): 2.0 µg/√Hz
  • Electrical Noise, Equivalent g, Nominal (Broadband: 2.5 Hz to 25 kHz): 8.0 µg