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The Columbia Models SI-702AI and SI-702AIHP are biaxial force balance inclinometers with a 4–20 mA data transmission output circuit. The 4–20 mA system is widely used in industrial settings to send data over long distances in areas where interference from surrounding electrical power lines is a concern.
Both the sensor and the 4–20 mA line driver are powered by a single +15 volt supply. These devices can deliver reliable tilt data even in high-vibration conditions thanks to special desensitization circuitry. The SI-702BI and SI-702BIHP Biaxial Inclinometers have similar features and provide an output voltage as well as current.
4–20 mA output
High performance and low cost
Biaxial Tilt Sensor

Image Credit: Columbia Research Laboratories, Inc.
Specifications
Operational
Table 1. Source: Columbia Research Laboratories, Inc.
| Operational | SI-702AI | SI-702AIHP |
|---|---|---|
| Ranges Available | ±15º, ±30º, ±45º, ±90º | ±5º, ±15º, ±30º, ±45º, ±90º |
| Output Current | 4-20 mA | |
| Output Function | Io = 12 + K Sin θ (mA) ±0.5% of NormalInto a Maximum Load of 600 Ohms | |
| Excitation | +15 ±1 VDC<50 mA | |
| Output Impedance | 50 Megohm Typical | |
| Non-Linearity | ±0.2% F.R. | ±0.1% F.R. |
| Non-Repeatability | ±0.1% F.R. | |
| Scale Factor Tolerance | ±1% | |
| Scale Factor Temp Coefficient | ±0.02% / Deg C | |
| Zero Bias | 12 ±0.02 mA | |
| Zero Bias Temp. Coefficient | ±0.002% F.R. / Deg C | |
| Resolution | 0.01% F.R. | 0.001% F.R. |
| Bandwidth | 0 to 3 Hz (-18 dB / Octave Rolloff) | |
| Orthogonal Sensitivity | <1% | |
| Case Alignment | ±0.5 Deg | |
| Vibration Overload vs. Frequency | See Figure 1 | See Figure 2 |
Environmental
Table 2. Source: Columbia Research Laboratories, Inc.
| Environmental | SI-702AI | SI-702AIHP |
|---|---|---|
| Temperature, Operating | -40 to +85 Deg C | |
| Temperature, Storage | -40 to +85 Deg C | |
| Random Vibration (2 to 2,000 Hz) | 5 G RMS, 0.25” Disp. D.A. | 15 G RMS, 0.25” Disp. D.A. |
| Shock Survival | 125 G, 5 mSec | 1000 G, 1 mSec |
| Humidity | 95% R.H. | |
Physical
Table 3. Source: Columbia Research Laboratories, Inc.
| Physical | SI-702AI | SI-702AIHP |
|---|---|---|
| Weight | 12 Oz (340.2 Gm) | |
| Size | 4.06 In L x 3.125 In W x 2.13 In H(10.31 cm L x 7.94 cm W x 5.41 cm H) | |
| Case Material | Anodized Aluminum | |
| Sealing | Environmental | |
| Electrical Interface | Connector MS3443412-10P or Equiv. | |
| Mating Connector (Optional) | PT06A-12-10S(SR) or Equiv. | |
Typical Frequency Response
SI-702AI & SI-702AIHP

Image Credit: Columbia Research Laboratories, Inc.
Vibration Overload vs. Frequency

Figure 1. Image Credit: Columbia Research Laboratories, Inc.

Figure 2. Image Credit: Columbia Research Laboratories, Inc.
Output Connector Pin Functions
Table 4. Source: Columbia Research Laboratories, Inc.
| SI-702AI and SI-702AIHP | |||
|---|---|---|---|
| Pin | Function | Pin | Function |
| A | +15 VDC Power | F | Spare |
| B | Power Ground | G | Spare |
| C | Current Return | H | Spare |
| D | Io – X Axis | J | Spare |
| E | Io – Y Axis | K | Spare |
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