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Real-Time Dam Safety Alerts with Differential Pressure Water Level Sensors
Key Takeaways An alert chain needs more than a sensor: define field in...
Strain-type Vibration Pickup for Field Monitoring
Strain-type Vibration Pickup
Tunnel monitoring often means burying sensors in concrete or soil for years. Under those conditions, a pickup that stays stable without recalibration is more useful than one with the highest sensitivity on paper. That is where the strain-type design comes in — it measures vibration through mechanical strain on a sensing element, which gives it strong low-frequency response and a sturdy build that handles rough installations. Kingmach has been supplying geotechnical instruments long enough to know that projects rarely fit a template. This pickup is part of a wider line that can be adjusted for specific frequency ranges, cable lengths, or mounting fittings. It is aimed at engineers who need readings they can trust over long deployment periods, not just lab-grade numbers.
Technical Detail
Configured around process stability, mold life, and long-term uptime.
A strain-type vibration pickup converts mechanical motion into an electrical signal by measuring strain on a resistive element. The operating principle makes it inherently suitable for low-frequency vibration — typically below a few hundred hertz — which covers most civil engineering needs: bridge pier movement, tunnel convergence, or blasting vibration in mining. Unlike piezoelectric sensors that need charge amplifiers and struggle with static deflection, strain-type pickups can read down to near DC, so they catch slow drift and long-period dynamics. They also run without external excitation in many configurations, which simplifies cabling on large sites. Kingmach positions this pickup as a mid-range solution: built with industrial-grade components, tested for moisture and dust ingress, but without the overhead of high-end seismic research units. That means engineers get fieldwork-ready hardware with known response curves, plus the option to request custom damping or temperature compensation if the site demands it. Typical outputs are bridge-based voltage signals that interface with most data loggers; we can pre-wire connectors to match existing monitoring networks. Because Kingmach manages production in-house, lead times for non-standard mods tend to be shorter than with OEM-only channels. Technical support covers installation advice, troubleshooting during commissioning, and long-term recalibration services. Distribution is handled through regional partners who stock common variants, so replacements or spare mounting kits arrive without excessive delay.
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FAQ
Common technical questions
How does a strain-type vibration pickup differ from a piezoelectric accelerometer?
The main difference is the sensing mechanism. Strain-type pickups use a resistive element that bends with vibration, giving a direct voltage or resistance change. They work well at low frequencies, even down to static deflection. Piezoelectric units generate charge under acceleration and need high-impedance signal conditioning; they are better for high-frequency, dynamic measurements. For structural monitoring where signals are slow — like bridge settlement — the strain-type pickup often provides a simpler signal chain.
What is the typical frequency range of this pickup?
Most standard strain-type vibration pickups cover from near DC up to around 200–500 Hz. The exact range depends on the mechanical design and damping. Kingmach can tune the range to match project requirements, but in general these sensors are not meant for ultrasonic or high-speed rotating machinery. They fit seismic, structural, and geotechnical monitoring applications where vibrations are below a few hundred hertz.
Can the sensor be installed in wet or buried environments?
Yes, with proper sealing. Kingmach offers versions with IP67 or higher protection, suitable for direct burial in soil or installation in concrete. For long-term submersion, we recommend additional waterproofing of cable splices. The stainless steel housing resists corrosion, and the strain element is enclosed to prevent moisture damage. Installation procedures are documented, and our support team can review site plans to flag potential issues.
What kind of output signal does it provide?
It typically outputs a millivolt-level signal from a Wheatstone bridge, which can be read by any standard strain gauge amplifier or datalogger. Some configurations include built-in amplification to deliver a 0–5V or 4–20mA signal. If you already have a Campbell Scientific, Geokon, or similar logger, we can match the wiring and scaling factors to integrate seamlessly.
Are custom mounting brackets or cable lengths available?
Yes, that is a core part of what we do. Standard models come with a fixed mounting stud and 5-meter cable, but we regularly supply extended cables up to 50 meters, custom brackets for awkward attachment points, or even stainless steel armored cables for environments with rodent risk. Just give us the details in the inquiry, and we will confirm the lead time.
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