ER‑QA‑03D High‑Temperature Dedicated Sensor for Petroleum MWD (Measurement While Drilling)

ER-QA-03D (-55~180℃):
1. High-Temp 180℃;
2. Small Size Ф25×21.5mm;
3. Weight: ＜55g.

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Introduction

The ER‑QA‑03D series is a high‑temperature‑resistant and vibration‑resistant dedicated sensor for petroleum Measurement While Drilling (MWD) applications. Featuring a circular flange design, this product offers excellent repeatability and start‑up performance, along with high‑temperature tolerance, vibration resistance, and high reliability. It is suitable for both static and dynamic testing and also serves as a standard vibration sensor.

This product adopts a circular flange design and has excellent high-temperature performance. It is mainly applied in the field of petroleum inclinometer. It can replace the high-temperature acceleration sensor products of foreign counterparts such as QA650, T185, T160, and JAE series products . We adopt a dual-torque structure, which is different from other companies' products. This can make the bias and proportional coefficient of the accelerometer more stable and it has independent intellectual property rights.

Since its launch in 2010, the product has matured and become widely adopted, particularly in petroleum inclinometry and MWD applications.

Specification

Parameter	ER-QA-03D01	ER-QA-03D02	ER-QA-03D03
Output range	±30g	±30g	±30g
Bias K0/K1	<10mg	<15mg	<15mg
Bias monthly repeatability（1σ, 1month)	<50µg	<200µg	<200µg
Bias Temperature coefficient	<50µg/℃	<100µg/℃	<100µg/℃
Scale factor K1	1.2±0.1 mA/g	1.2±0.1 mA/g	1.2±0.1mA/g
Scale factor error	8.3%	8.3%	8.3%
Scale factor repeatability （1σ, 1month)	<80 ppm	<150 ppm	<150 ppm
Scale factor temperature coefficient	<100ppm	<200ppm	<200ppm
Installation error	<1500µrad	<1500µrad	<1500µrad
Vibration rectification error	<30µg/g 2rms(50-500Hz)	<100µg/g 2rms(50-500Hz)	<100µg/g2rms (50-500Hz)
Noise	<3000µg-rms (0-10000Hz)	<3000µg-rms (0-10000Hz)	<3000µg-rms (0-10000Hz)
Operating temperature range	-55~96℃	-55~155℃	-55~180℃
Shock	500g 0.5ms	1000g 0.5ms	1000g 0.5ms
Vibration	25g@30-500Hz	25g@30-500Hz	25g@30-500Hz
Resolution	<10µg	<10µg	<10µg
Bandwidth	>300Hz	>300Hz	>300Hz
Current consumption	＜20mA	＜20mA	＜20mA
Power dissipation@ ±15VDC	＜480mW	＜480mW	＜480mW
Input voltage	±13 to ±18V	± 13 to ± 18V	±13 to ± 18V
Weight	＜55g	＜55g	＜55g
Mounting diameter	Ф25mm	Ф25mm	Ф25mm
Height	＜21.5mm	＜21.5mm	＜21.5mm
Shell material	300 series stainless steel	300 series stainless steel	300 series stainless steel

Dimension

Electrical interface

The servo circuit electrical interface relationships are shown in Table 1. The terminal arrangement and description should conform to the following diagram. The terminal arrangement is shown from the bottom view (pins facing upward).

Table 1 Servo circuit electrical interface relationship (AD590)

Lead-out terminal Serial number	symbol	Pin function	Lead-out terminal Serial number	symbol	Pin function
1	M_L	Signal output terminal	6	T_se	Self-check terminal
2	M_H	Current test terminal	7	C_ext1	Differential capacitance detection terminal 1
3	V_-	Negative power supply terminal	8	C_ext2	Differential capacitance detection terminal 2
4	V₊	Positive power supply terminal	9	V_O-	AD590 low-end
5	GND	ground	10	V_O+	Regulator positive output(AD590High-end)