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QFA-125 Quartz Flexure Accelerometer Series

The Jewell Instruments QFA-125 Series Accelerometers are state of the art quartz flexure technology that provides high accuracy, repeatability and stability even in the harshest of environments.


Additional information


• High Temperature
• Excellent Repeatability
• High Accuracy
• Environmentally Rugged
• High Stability
• Square or Round Mounting Flanges
• Small Compact Design
• Built-in Self Test System
• Low current


• Well borehole logging (Wireline)
• Measure While Drilling (MWD)
• Oil Drilling
• Orientation Systems for Drilling Applications
• Borehole Mapping

Performance Specifications


Acceleration Range (g maximum)1, 2±30
Scale Factor (mA/g)21.1 to 1.4
Bias (mg, maximum @25 °C)20
Axis Alignment (mRad, maximum @25 °C)1.5
Threshold & Resolution (µg, maximum)10
Bandwidth (Hz, minimum)300
Scale Factor Temperature Sensitivity (PPM/°C, maximum)
+25°C to +120°C±150
Bias Temperature Sensitivity (µg/°C, maximum)±100
Scale Factor Stability (1 month composite)<250 PPM
Bias Stability (1 month composite)<250µg
Noise (mgrms, maximum) (0Hz to 10kHz, maximum)3


Input Voltage (Vdc)±12 to ±18
Input Current ±13 mA maximum @ ±18 Vdc input
±10 mA maximum @ ±15 Vdc input
±8 mA maximum @ ±12 Vdc input
Output Impedance (Ω)External Load Resistor Dependent


Operational Temperature Range-55 to +125°C
Vibration (sine, maximum)25 Hz to 500 Hz,25g
Vibration (random) (Rectification, maximum)50 Hz to 500 Hz, 100 ug/g2rms
Shock (g)1000, 0.5msec, ½ sine

1: Specifications apply and are characterized up to ±1g range. The accelerometer is capable of supplying acceleration information up to ±30g but at a reduced accuracy
2: Scale factor shown in mA/g as a standard. If you require scale factor in volts/g, please specify voltage range when ordering.
3: Voltage output via customer supplied load resistor

*Specifications subject to change without notice on account of continued product development.



Round Mounting Flange Outline Drawing
Square Mounting Flange Outline Drawing