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ACCELEROMETER (200°C)

The LH series accelerometers are engineered for 200°C high-temperature operation, tailored to meet the downhole application requirements of extreme thermal environments. Leveraging the company’s core technical expertise, these accelerometers boast an extended operating temperature rating of 200°C, delivering consistent and reliable long-term performance even under such harsh high-temperature conditions.

As high-performance servo-balanced quartz accelerometers, they are specifically designed to withstand the severe environmental rigors of diverse downhole operations, including directional drilling, MWD/LWD and wireline logging. Their field-proven ruggedized design further guarantees stable and dependable long-term operation at the full 200°C operating temperature.

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Product Specifications

Features

● Current output

● Wide dynamic range

● 200°C operating temperature range

● Excellent bias and scale stability

● Non-magnetic

Applications

● MWD Directional Modules

● Near Bit Systems

● Rotary Steerable Systems

Specifications

Environmental
Temperature (operating/non-operating)		-40°C to +200°C
Vibration	Sine	30G 0-peak, 30Hz-500Hz
	Random	20Grms, 15Hz-500Hz
Shock (0.5ms, half sine)	Operating	1,000G
	Survival	1,500G
Electrical
Input voltage		±12.0 VDC to ±18.0 VDC
Input current (quiescent)		10 mA max.
Insulation resistance (power return to case)		50 MΩ min. @ 50VDC
Mechanical
Weight		30 grams max.
Material		Stainless steel (non-magnetic)

Performance
Measurement range			±4.0 G min.
Output voltage			±10.0 VDC min. @±15.0 VDC excitation
Scale factor	Nominal (@ 25°C)		2.50mA/G±5%
	Temperature coefficient	-40°C to +175°C 175°C to +200°C	±120 ppm/°C max. ±300 ppm/°C max.
Bias	Nominal (@ 25°C)		±10.0 mG max.
	Temperature coefficient		±100 μG/°C max.
Axis alignment	Nominal (@ 25°C)		±3.0 mrad max.
Noise	1 Hz to 500 Hz		5 μA rms max.
Resolution and Threshold			±1 μG max.
Linearity			±0.01 % full scale max.
Frequency response (bandwidth)			500 Hz min.
Long term stability (1 year)	Combined Scale factor and Bias shift		1,800 μG max.