Blade-passing frequency = RPM × blade count ÷ 60. At 200,000 RPM and 12 blades, the passing frequency is 40 kHz. A nominal 100 kHz bandwidth alone does not guarantee reliable pulse detection.
SENSOR SYSTEMS / ECS-AUTO
High-speed RPM & automotive eddy sensors
Specify shaft phase-reference pulses, turbocharger blade-passing signals and dynamic tip clearance around the actual target geometry.
Specify this system ↗
Turbocharger test stands · valve lift · high-speed shafts
Define the conditions behind the measurement
Define blade material, minimum thickness, tip speed, air gap and trigger electronics. RPM measurement and continuous tip-clearance measurement require separate validation.
For valve lift and piston-motion tests, include temperature, vibration and the conductive target path. Request frequency response and signal-to-noise evidence for the proposed assembly. For thin blade tips, review transit time and peak-signal attenuation as well as blade-passing frequency.
Listed ranges and interfaces are inquiry options. Approved ratings, drawings and calibration data belong to the selected configuration.
Metal grade, thickness and curvature change the curve.
Request factory linearization for AISI 4140 / 42CrMo, aluminum 6061, stainless steel 304 / 316, copper or titanium. Confirm the representative target and calibration conditions in your quote.
| Decision | Eddy current displacement system | Standard inductive proximity switch |
|---|---|---|
| Measurement | Continuous distance or dynamic motion | Target present / absent |
| Output | Calibrated voltage, current or digital distance | Discrete ON / OFF |
| Specify | Range, resolution at bandwidth, target and calibration | Switching distance, hysteresis and switching frequency |
Analog inductive distance sensors also exist. Compare the actual measurement principle and performance, rather than the category name alone.
Before you approve the measuring system
Can the same calibration be used on steel and aluminum?
Do not assume so. Specify the material grade, thickness and curvature and agree the calibration curve for your target.
Can a replacement probe be mixed with an existing driver?
Only after the exact probe, electrical length, driver, target and output curve have been qualified together. Connector fit alone is insufficient.
What does a configuration quote include?
Request a matched probe, cable and conditioner, selected mounting accessories, calibration conditions, performance evidence and confirmed price and delivery.
ECS-AUTO / CONFIGURATION REQUEST
Build the probe, cable and conditioner together.
Include a mounting adapter, armored cable or portable calibration fixture in the request below.