The document describes a capacitive displacement sensor system called idiamCONTROL 801 that measures wear in 8-shaped bore holes of extruder machines. The system uses a double sensor probe that measures the internal diameter and position as it is pushed through the bore hole, allowing a longitudinal profile of the bore hole to be created. The non-contact capacitive sensors can accurately measure different metals without wear and provide data to a PC for analysis and comparison over time to assess wear in the bore holes.

1. A055_e
Capacitive displacement sensors
capaNCDT
Wear measurement at 8-shaped bore holes in extruder machines
The internal bore hole diameter measuring unit Technical details
idiamCONTROL 801 detects the wear in the 8- - Measuring range: 10 mm
shaped bore holes of extruder machines by - Accuracy: 0.1 mm
measuring the internal diameter. For this purpose a - Resolution: 0.05 mm
measuring probe is pushed into the bore hole. An - Axial resolution: 5 mm
integrated capacitive double sensor measures the - max.speed: 5 m/s
actual bore hole diameter. In addition the sensor
position in the longitudinal axis of the bore hole is Ambient conditions
measured with a cable-length measuring system. - Temperature: 5 - 60 °C
This means that every sensor position is assigned - Medium: air
a diameter. Through a computer interface the - Interference: IEC 1000-4-1
measurement data are transferred to a PC, where
they are evaluated. As a result the longitudinal bore Electromagnetical Compatibility (EMC):
hole profiles are available in 6 tracks with an axial EN 50 081-2 and EN 50 082-2
resolution of 6 mm. Information about wear is
obtained by comparing the diameter values at
different
Principle
Electronic evaluation
Machine section with Sensor with guide unit with positioning
“8”-shaped overlapping roller carrier system
bore holes
SA
Sensor A
x
<
Sensor B *
SB
§CR
Diameter: = SA +SB + const.

2. Application
System configuration - IDC 801
- IDS-801-SUDouble sensor capaNCDT with
mechanical locating arrangement
- IDC-801-CUControl unit with computer-interface
(RS232)
Reasons for choosing the system
- capaNCDT sensors measure in a non-contacting
way and without wear
- capaNCDT sensors are calibrated for all metals,
they are independent of any material
inhomogenities
- Due to the double sensor principle exact centre-
line guidance of the measuring probe is not
necessary
Pics: Werner & Pfleiderer, Stuttgart
MICRO-EPSILON A member of micro-epsilon group.
Koenigbacher Str. 15 Tel.: 0 85 42/1 68-0 info@micro-epsilon.com Certified DIN EN ISO 9001 : 2000
94496 Ortenburg / Germany Fax: 0 85 42/1 68 90 www.micro-epsilon.com Modifications reserved Y9781055