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.
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