Piezoelectric Accelerometer for Cryogenic Services in Cold Temperatures

The Model 876 Piezoelectric Accelerometer from Columbia Research Laboratories has been designed for vibration measurement or tracking applications that need operation at extremely cold temperatures.

The accelerometer is ideal for event and vibration tracking of valves and pumps applied in the cryogenic service.

The shear plate construction offers utmost mechanical isolation from thermal shock transients and strain-induced inputs. The electrically separated and double case construction provides electrostatic shielding as well as decreasing power line frequency noise due to multi-point grounding. The accelerometer equips a 10 to 32 top connector.

Users can consult the factory for tailored versions of this sensor.

Piezoelectric Accelerometer for Cryogenic Services in Cold Temperatures

Image Credit: Columbia Research Laboratories

  • Extreme cold temperature
    Vibration and shock measurements
  • Electrical isolation
  • Sealed hermetically
  • Low base strain sensitivity

Specifications

Source: Columbia Research Laboratories

Transfer / Electrical 876
Charge Sensitivity1
@ 75 Deg F Nominal
@ -420 Deg F to –295 Deg F

50 +/-10 pC/g
25 pC/g +/-5%
Capacitance
@ 75 Deg F Nominal
@ -420 Deg F To –295 Deg F

4,200 +/-100 pF
1,700 pF +/-5%
Frequency Linearity2 +/-5% Max
2 Hz To 4,000 Hz
Mounted Resonant Frequency 20 KHz, Min.
Transverse Sensitivity 5% Max
Amplitude Linearity +/-1.0% (BFSL) / 2,000 g
Insulation Resistance 10,000 M Ohm Min, 50 VDC Test
Isolation Resistance 50 M Ohm, Min.
Housing to Signal Output Terminals Shorted

 

Environmental 876
Vibration Limit 3,000 g Max (Sine)
Shock Limit 10,000 g Peak ½ Sine
Temperature Range -450 To +300 Deg F (-267 To +149 Deg C)
Humidity3 0 To 100% R.H.
Base Strain Sensitivity 0.005 g/μE Equiv, Typical
Electromagnetic Sensitivity 0.005 g (Equiv / 100 Gauss)
Acoustic Sensitivity 1.0 g Max @ 170 dB Whitenoise 75 To 960 Hz

 

Physical 876
Configuration Bolted Shear Plate
Size 0.625 In. Hex. x 1.000 In. H (15.9 mm Hex x 25.4 mm H)
Weight 1.2 Oz (33 Gm)
Case Material 18-8 Stainless Steel
Electrical Interface Coaxial 10-32 Thread
Mounting 10-32 UNF Tapped Base

 

Notes:

1 At +75 Deg F, 10 g Peak, 100 Hz; Lower Frequency Limit is Determined by Associated Electronics
2 Referenced to Sensitivity @ 100 Hz.
3 Unit is Hermetically Sealed.

Accessories Supplied

  • Mounting Stud, St Stl measures around 10-32 x 0.5
  • Standard room temperature calibration data
  • Comes with a hardwood storage case
  • Provided with a Certificate of Calibration Traceable to N.I.S.T.

Optional Accessories

  • Low temperature calibration data

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