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Rotary Capacitive Displacement Transducer


RCDT Transducer Range A B C D E
0 to 300 ° 43mm 37mm 20mm 6mm 24mm

The RDP Electronics RCDT transducer measures the rotary position of its shaft, with respect to its body. The unit has integral electronics meaning that it can be supplied with dc and has a dc output. The output ranges from 0.5 to 3.5V for the full-scale range.

One of the main advantages of the RCDT is that there is no physical contact across the sensing element. The rotary position of an eccentric shaft is measured using a well-proven non-contact position measurement technique. This ensures that, unlike Potentiometers, the quality of the data is maintained, as the sensing element does not wear. As the RCDT is absolute, data is accurate from switch on and there is no need for repeated zero referencing.

Applications for the RCDT rotary position sensor include the obvious rotary applications for angular position as well as less obvious applications in incline or tilt measurement. For incline measurement, the unit may have pendulum attached to the rotor such that the output is proportional to the incline of the sensor.

The RCDT sensor contains a precision bearing set to maintain its excellent resistance to off axis forces. In order to protect the bearings the unit should be mounted such that it is well aligned and/or using a flexible coupling as bearing wear may reduce accuracy.


RCDT Nominal Output Graph
The output at 0 degrees is approximately 0.5V. The output rises by a nominal 3V over the range of the transducer. Outside the measurement range, the output is non-linear and may not be repeatable and therefore should not be used for angle measurements.


Specification
　
Measurement Range (Full scale) RCDT/300 = 0 to 300°
Mechanical Range Continual rotation. See graph for output.
Supply 15V ±10%, 6mA stabilised.
Output 0.5 to 3.5V (nominal). Output common floats at 7.25V
with 15V supply and must not be grounded.
Linearity (% error of full scale) ±1%
Resolution Limited by electrical noise output but typically 0.01% F.S.
Repeatability Better than 0.05% F.S.
Output ripple (noise) 5mV (rms) (10kHz to 30kHz), 0.1mV averaged dc
Slew rate 6000 rpm
Temperature Coefficient ±0.01% F.S./°C
Operating Temperature -25°C to +75°C (non-condensing)
Storage Temperature -40°C to +100°C (non-condensing)
Max starting torque 0.42 mNm (milli Newton metres)
Inertia 15gcm²
Weight (w/o cable) 102gms
Weight with cable 140gms
Electrical Termination 2m screened cable
Mounting threads (both ends) 2 off M3 x 0.5 at 24mm centres


Ganged RCDT image For applications where it is necessary to have dual outputs of angle or single redundancy, two units may be 'ganged' together as a factory option. The rotor shaft is common but all electrical circuits are completely separate. Please contact us for full dimensional details of this option.


RDP Electronics can offer a full range of Capacitive Transducer signal conditioning . .


Due to the RDP Electronics policy of on-going development, specifications may change without notice.
Any modification may affect the specification of our equipment.