Force Balance Accelerometers: Biaxial Sensors

The Columbia SA-220RHT and SA-225RHT Force Balance Accelerometers are designed to be used as Measurement While Drilling (MWD) sensors in downhole well servicing applications. The Model SA-220RHT is powered by ±15 VDC and can withstand temperatures of up to 200 °C.

The model SA-225RHT runs at 190 °C and requires ±5 VDC. Both sensors are self-contained and give a high-level, low-impedance output, avoiding the need for signal conditioning at high temperatures.

The SA-220RHT and SA-225RHT sensors have become the established standard used in downhole high-temperature mapping because of their remarkable high-temperature performance, tough designand low power consumption.

Choice of power options

200 °C and 190 °C operation

Biaxial sensors

Force Balance Accelerometers: Biaxial Sensors

Image Credit: Columbia Research Laboratories, Inc.

Specifications

Operational

Table 1. Source: Columbia Research Laboratories, Inc.

Operational	SA-220RHT	SA-225RHT
Ranges Available	±1 G to ±10 G	±1 G to ±5 G
Output Voltage	±5 Volts ±2%Into 100 K Load	±3 Volts ±2%Into 100 K Load
Excitation	±15 VDC<40 mA	±5 VDC<20 mA
Case Alignment	<0.5°
Non-Linearity	±0.05% F.R.	±0.10% F.R.
Hysteresis	±0.07% F.R.	±0.15% F.R.
Non-Repeatability	±0.10% F.R.	±0.15%FR.
Resolution	<0.001% F.R.	<0.002% F.R.
Zero Bias	±0.15% F.R.	±0.25% F.R.
Zero Bias Temp. Coefficient	±0.002% F.R./°C	±0.003% FR/°C
Scale Factor Temp. Coefficient	±0.025%/°C
Natural Frequency	50 Hz to 300 HzDependent on Range	50 Hz to 250 HzDependent on Range
Damping Ratio	0.6 to 1.0	0.7±0.2
Cross Axis Sensitivity	0.01 G/G

Environmental

Table 2. Source: Columbia Research Laboratories, Inc.

Environmental	SA-220RHT	SA-225RHT
Temperature, Operating	-40 to +200 °C	-40 to +190 °C
Temperature, Storage	-50 to +200 °C
Random Vibration (2 to 2000 Hz)	25 G RMS, 0.5'' Disp. D.A
Shock Survival	500 G, 0.5 mS

Physical

Table 3. Source: Columbia Research Laboratories, Inc.

Physical	SA-220RHT	SA-225RHT
Weight	3.34 oz (94.7 gm)
Size	1.13"Sq. x 2.285"H (2.9 cm Sq x 5.8"H)
Case Material	Nickel Plated Aluminum
Sealing	Environmental
Electrical Interface (Standard)	6 Terminal Pins

Vertical Mounting Plate Columbia P/N AFB04418P01.

Vertical Mounting Plate Columbia P/N AFB04418P01. Image Credit: Columbia Research Laboratories, Inc.

Horizontal Mounting Plate Columbia P/N AFB04418P02.

Horizontal Mounting Plate Columbia P/N AFB04418P02. Image Credit: Columbia Research Laboratories, Inc.

I/O Connector Pin Functions

Table 4. Source: Columbia Research Laboratories, Inc.

SA-220RHT
Pin	Function
1	+15 VDC
2	Ground
3	-15 VDC
4	X Output
5	Ground
6	Y Output
Pins 2 & 5 are common ground to pwr supply and both outputs

Table 5. Source: Columbia Research Laboratories, Inc.

SA-225RHT
Pin	Function
1	+5 VDC
2	Ground
3	-5 VDC
4	X Output
5	Ground
6	Y Output
Pins 2 & 5 are common ground to pwr supply and both outputs

标签：Accelerometers

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