Posted in | Accelerometers

Linear Accelerometers: Seismic Event Sensors

Models SA-207LN and SA-307LN from Columbia Servo Accelerometers are low-noise, high-sensitivity sensors used in seismic and low-level, low-frequency motion research. The accelerometers are self-contained and generate a high-level, low-impedance signal. In most cases, signal conditioning is unnecessary.

These multi-axis sensors, like the single-axis SA-107LN, provide readings in the low-frequency micro-G region. Apart from the usual DC-coupled zero output, the SA-207LN and SA-307LN Accelerometers also provide an AC-coupled zero output that removes tilt-induced or offset errors while also allowing for significant amplification of the fundamental output.

Note: Exports of accelerometers from the United States are subjected to the Export Administration Regulations (EAR) and/or the International Traffic in Arms Regulations (ITAR) authorization procedures.

  • Two or three axes
  • Ultra-low noise
  • Seismic event sensors
  • High-level output

Specifications

Operational

Table 1. Source: Columbia Research Laboratories, Inc.

Operational SA-207LN SA-307LN
Ranges Available +0.1 G to +2 G +0.5 G to +2 G
Output Voltage +7.5 Volts into 100 K Load
Excitation +12 to +15 VDC
<20 mA
+12 to +15 VDC
<30 mA
Output Impedance <1000 Ohms
Sensitive Axis Alignment Better Than 0.25 Deg
Scale Factor Tolerance +1%
Scale Factor Temp Coefficient 0.01% / Deg C Max.
Zero Output
A.C. Coupled
D.C. Coupled

<5 mV
<1 mG
Null Temp Sensitivity 75 μV./ Deg C
Natural Frequency 100 to 200 Hz
Dependent Upon Range
Damping 0.7 +0.1
Cross Axis Sensitivity 0.002 G/G Exclusive of Sensitive Axis Alignment
Output Noise <2.5 μV RMS From 0 to 50 Hz
Non-Linearity <+0.1% F.R.
Hysteresis & Non-Repeatability <0.5 mG
Threshold & Resolution Better Than 1 μG

 

Environmental

Table 2. Source: Columbia Research Laboratories, Inc.

Environmental SA-207LN SA-307LN
Temperature, Operating -40 to +80 Deg C
Temperature, Storage -50 to +90 Deg C
Vibration Survival (2 to 2,000 Hz) 5 G RMS, 0.5” Disp D.A.
Shock Survival 200 G, 5 mSec (1/2 Sine)
Ambient Pressure 0 to 5 Atmospheres
Humidity 95% R.H.

 

Physical

Table 3. Source: Columbia Research Laboratories, Inc.

Physical SA-207LN SA-307LN
Weight 8 Oz (227 Gm) 12 Oz (340 Gm)
Size 3.31 In L x 2.80 In W x 2.00 In H
(8.4 cm L x 7.1 cm W x 5.1 cm H)
4.06 In L x 3.13 In W x 2.13 In H
(10.3 cm L x 7.9 cm W x 5.4 cm H)
Case Material Anodized Aluminum
Sealing Environmental
Electrical Interface 7 Terminal Pins MS3443412-10P or Equiv.
Optional Mating Connector N/A PT06A-12-10S(SR)

 

SA-207LN Outline

Linear Accelerometers: Seismic Event Sensors

Image Credit: Columbia Research Laboratories, Inc.

SA-307LN Outline

Linear Accelerometers: Seismic Event Sensors

Image Credit: Columbia Research Laboratories, Inc.

Z Option

Linear Accelerometers: Seismic Event Sensors

Image Credit: Columbia Research Laboratories, Inc.

I/O Terminal Pin Functions

Table 4. Source: Columbia Research Laboratories, Inc.

SA-207LN SA-307LN
Pin Function Pin Function
A +15 VDC A +15 VDC
B Ground B Ground
C -15 VDC C -15 VDC
D DC Output X D DC Output X
E AC Output X E AC Output X
F DC Output Y F DC Output Y
G AC Output Y G AC Output Y
    H DC Output Z
    J AC Output Z

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