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ISTI - Model SM1500 & SM550 -Strong Motion Acceleration Sensors
The SM550 and SM1500 (Fig. 4 - 6) are two MEMS type, three-component acceleration sensors. Both have wide frequency response. The SM1500 model provides response from DC to 750 Hz, while the SM550 model provides response from DC to 50 Hz. Many output ranges are available for both models: +/-2 g, +/-4 g, +/-5 g, +/-6 g, +/-10 g, +/-12 g. Default sensitivity is 2.4 V/g for the SM1500, and 1.2 V/g for the SM550.
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The SM1500 and SM550 accelerometer technology is based on a variable capacitor transducer and a feedback circuit that operates in a closed-loop configuration. The feedback force is controlled by an application-specific integrated circuit (ASIC), which provides high reliability and low-output noise.
- The SM1500 and SM550 sensors operate from a 12 V DC power supply that can range from 9 V DC to 18 V DC. The typical power consumption is 33 mA.
- Acceleration output is differential analog, swinging between +/-5 V. Other output voltages are available.
- 4 – 20 mA current loop output is also available for both sensors.
- The default cable length between the sensor and the digitizer is approximately 2 meters, but it can be extended. The 2 – 40 mA version can have a long connection cable.
- The sensors are surface or wall mounted over a provided adjustable base, giving the ability for leveling and orientation.
- Seismic accelerometers can be used for early warning systems’ implementation.
- 3 axis accelerometers
- Ultra low power consumption
- Surface/wall mounting
- MEMS (Force balance/ASIC technology)
- DC – 750 Hz
- Wide Dynamic Range 96 dB
- Output range +/-2 g to +/-12 g linear
- Noise level 6 ugrms/sqrt (Hz)
- Operating temperature -20 to +70°C
- Borehole type (optional)
- 4 – 20 mA current loop output – NEW!