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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
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. Image Credit: Columbia Research Laboratories, Inc.
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 | |
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