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Kingmach Capacitive Accelerometer: Practical Field Monitoring

capacitive accelerometer

Capacitive accelerometers are a mainstay in geotechnical monitoring, but not all are built for the rough realities of field work. Some drift with temperature swings, others fail after a few weeks of damp soil. Kingmach takes a different tack. Our sensors are designed around long-term stability and simple installation, rather than chasing lab-grade specs. We focus on sealing, temperature compensation, and flexible signal options so engineers can wire them directly into existing data loggers. Whether you’re tracking slow slope creep or fast construction vibrations, there’s a configuration that fits without over-engineering your budget.

Technical Detail

Configured around process stability, mold life, and long-term uptime.

Kingmach’s capacitive accelerometers use MEMS sensing elements with low noise density, typically around 25 µg/√Hz, enabling clear data even at tiny tilt angles. Standard ranges span ±2g to ±200g, covering most civil monitoring needs from micro-seismic detection to impact recording. Frequency response is flat down to 0 Hz, so you capture both dynamic events and static tilt without gap. The stainless steel body and potting inside hold up against moisture and dust – IP67 is the baseline, with IP68 available as an upgrade. Output is your choice: 4-20 mA current loop for long cable runs, 0-5 V for local controllers, or RS485 Modbus when you want digital access. Temperature compensation comes baked in from -20°C to 80°C, with calibration sheets showing typical thermal zero shift under 0.1% of full scale per degree. Installation usually involves a three-point mounting plate and a shielded cable with strain relief; we’ve seen too many field failures from pinched wires, so we reinforce the exit point. When paired with Kingmach loggers, you can pull drift-corrected data directly without dealing with conversion scripts. Custom requests – like specific cable lengths, different connector standards, or even a right-angle mount for cramped spots – are common for us, especially on tunnel lining and deep excavation jobs. The whole package is aimed at the middle ground: professional enough for serious monitoring, but without the aerospace price tag that makes project managers cringe.

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FAQ

Common technical questions

How does a capacitive accelerometer compare with a piezoelectric type for long-term monitoring?

Piezoelectric sensors leak charge over time, which makes them lousy for static or very low-frequency measurements – think slow bending of a retaining wall. Capacitive ones measure down to zero Hz, so they track both tilt and vibration decade after decade without signal decay. That’s why we lean capacitive for geotechnical work.

Can your accelerometers survive in a deep excavation with water and mud?

Yes, as long as you order the IP68 version. The standard unit is sealed to IP67, which is fine for rain and condensation. If the hole might flood, we add O-rings and a pressure-resistant cable gland, and we test each one at double its rated depth before shipping.

Do I need a special readout, or can I connect to a PLC?

Most customers order 4-20 mA or 0-5 V analog outputs, which go straight into any PLC analog input card. If you want digital, we can supply an RS485 Modbus version. Just let us know your existing setup; we’ll recommend the pinout and power requirements.

How do I pick the right measuring range for my project?

For building monitoring or bridge health, ±2g to ±10g usually captures all the action. Pile driving or blasting might need ±50g or ±200g to avoid clipping. Send us a quick sketch of your site and the goal – we’ll suggest a range and even send a sample with a calibration sheet for your own tests.

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