• 4-20 mA Output
  • +15 VDC Operation
  • Low Cost
  • High Performance
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The Columbia Models SI-701AI and SI-701AIHP are force balance inclinometers designed with an output circuit configuration made for use in 4-20 mA data transmission systems. The 4-20 mA system is used extensively in industrial installations in order to transmit data over long distances in environments where interference from nearby electrical power lines could be a problem.

A single +15 volt supply powers both the sensor and 4-20 mA line driver. Special desensitization circuitry allows these devices to provide accurate tilt data while in substantial vibration environments. Both configurations are also available with a convenient 6-pin electrical interface. Refer to Columbia Models SI-701AIC and SI-701AIHPC. Models SI-701BI and SI-701BIHP Inclinometers are similar configurations that provide voltage output in addition to current output. Consult the factory for customized versions of these sensors.


Output Impedance 50 Megohm Typical
Ranges Available +5°, +10°, +15°, +30°, +45°, +90°
Excitation +15 +1 VDC <50 mA
Scale Factor Tolerance +1%
Scale Factor Temp Coefficient +0.02% / Deg C
Output Current 4-20 mA
Output Function Io = 12 + K Sin (mA) +0.5% of Normal Into a Maximum Load of 600 Ohms
Non-Repeatability +0.1% F.R.
Non-Linearity +0.1% F.R.
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