gb
fr
de
ibs ibs ibs ibs ibs

CAPACITIVE MEASURING SYSTEMS

Our state-of-the-art capacitive systems offer world beating accuracy and unmatched speed.

A range of systems is available depending on your needs: resolution; speed; ease of integration or all three. The capacitive position or displacement measuring system consists of a driver and probe(s). Each driver offers a range of probes. System performance is determined by the driver-probe combination. In this way the optimum system for your requirements can be specified.

Systems are factory calibrated for the chosen range and a traceable calibration certificate provided. The table below provides an overview of available drivers and their performance specifications. 

 

Typical applications

  • Position measurement
  • Displacement measurement
  • Thickness measurement
  • Run-out / eccentricity measurement
  • Deformation measurement
  • Vibration measurement

 

Driver options

 Available probes* depend on your driver choice. Please contact us for expert advice.

Driver name:

CPL490

CPL190/290

CPL230

CPL350

Strength Best performance / bandwidth up to 50 kHz / modular design High performance / modular design Great performance / Compact size / Multi-channel Great performance / Compact size / Single channel
Maximum resolution 0,05 nm @ 1 kHz 0,05 nm @ 100 Hz 0,07nm @ 100 Hz 0,07 nm @ 100 Hz
Typical resolution @ 15 kHz 0,0007% F.S.* RMS 0,003% F.S.* RMS 0,004% F.S.* RMS 0,004% F.S.* RMS
Max. bandwidth 50 kHz 15 kHz 15 kHz 15 kHz
Measurement range 10 - 100 um 10 um - 12,5 mm 10 um - 12,5 mm 10 um - 12,5 mm
Typical linearity 0,2% F.S.* 0,2% F.S.* 0,5% F.S.* 0,5% F.S.*
Number of channels 1-3 1-8 1-6 1
Zero/Offset adjust Yes Yes No No
Typical thermal drift 0,02% F.S.*/°C 0,04% F.S.*/°C 0,04% F.S.*/°C 0,04 F.S.*/°C
LED range indicator Yes Yes No No
Cost indication €€€ €€
Other features Optional signal processing and meter module / Easy DAQ connection Optional signal processing and meter module / Easy DAQ connection Embeddable / OEM design Embeddable / OEM design

More details & probe options (click a system name)

CPL490 CPL190/290 CPL230 CPL350

* A probe is also refered to as sensor / F.S. = full scale

 

How does capacitive measuring work?

In a capacitive position sensor, the electrified plate is the sensor surface and the second plate is the target. The electronics continuously change the voltage on the sensor surface. This is the excitation voltage. The amount of current required to change the voltage is detected by the electronics and indicates the amount of capacitance between sensor and target. An AC bridge circuit or other active electronic circuit is typically used to convert the capacity change into a current or voltage signal and output. In typical capacitance-based position measurement, the size of the sensor and the target, and the dielectric medium (usually air) remain constant. The only variable is the gap. All changes in capacitance are therefore the result of a change in the position of the target relative to the sensor. The driver is calibrated and the output scaled to provide a specific voltage for a corresponding change in capacitance (i.e., gap or displacement).