Biaxial Force Balance Inclinometers

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

Biaxial Force Balance Inclinometers

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	I_o = 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

Biaxial Force Balance Inclinometers

Image Credit: Columbia Research Laboratories, Inc.

Vibration Overload vs. Frequency

Biaxial Force Balance Inclinometers

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

Biaxial Force Balance Inclinometers

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

标签：Inclinometers

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