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Accelerometer production

After accumulating over 23 years of field experience in oil, gas, and coal fields, the LHT series accelerometers have been launched, specifically designed for inclinometer applications, with an annual production capacity of over 2,000 units. These accelerometers adopt a single torque feedback design, utilize vacuum brazing technology for internal assembly, and employ thick-film technology for device interconnection. The entire assembly process is carried out under nitrogen protection. They are suitable for both static and dynamic acceleration measurement, and the output range can be adjusted by using different output load resistors.

The LHT series accelerometers are designed for operation at high temperatures up to 175°C, aiming to meet the requirements of downhole applications in extreme thermal environments. Leveraging the company's core technical expertise, these accelerometers offer an extended operating temperature range of 175°C, providing stable and reliable long-term performance even under stringent high-temperature conditions.

As high-performance servo-balanced quartz accelerometers, they are specifically engineered to withstand the harsh conditions of various downhole operations, including directional drilling, MWD/LWD, and downhole wireline logging. Their field-proven rugged design further ensures the stability and reliability of the equipment across the full 175°C operating temperature range.

1.Features

a. Current output;
b. Wide dynamic range;
c. 175°C operating temperature range;
d. Excellent bias and scale factor stability;
e. Non-magnetic.

2.Applications

a. MWD directional modules;
b. Near-bit systems;
c. Rotary steerable systems.

3.Technical Specifications of 175℃ Accelerometer

Environmental
Temperature (operating/non-operating)		-40°C to +175°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)

4.Technical Specifications of 200℃ Accelerometer

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)

5.Performance of 175℃ Accelerometer

Performance
Measurement range			±4.0 G min.
Output voltage			±10.0 VDC min. @±15.0 VDC excitation
Scale factor	Nominal (@ 25°C)		1.30mA/G±5%
	Temperature coefficient	-40°C to +175°C	±120 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.

6.Performance of 200℃ Accelerometer

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.