Manual
Double Sheet Detector-series I20
Mounting
B0069991 / Rev. 1.7
44
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
4.4
Sensor mounting in magnetic conveyors
Note
If the sheets are transported with magnetic conveyors, then the receiver
sensor should be mounted on the side that is opposite to the magnets.
If electromagnets are used in the conveyor belts, they must be supplied
with DC current. The residual ripple of the supply voltage must not exceed
5%. The supply voltage / current of the electromagnets may not be pulsed
during the measurement, as this distorts the measurement result.
The mounting of the sensors according to the following picture results in reliable double sheet
detection. It is important that the holding magnets are arranged in such a way that no secondary
magnetic flux develops between two magnetic conveyors rails either through the air or the sheet. It
is important that the mounting of the magnets in the conveyor belts results in an opposite magnetic
flux configuration of the type N<-->N or S<-->S.
Fig. 19: Sensor mounting, lateral view
Whenever possible the sensors should not be mounted close to the magnetic rails, but with the
greatest possible distance between the conveyors rails. The mounting brackets should consist of
plastic or stainless steel. Aluminum or materials of high electrical conductivity dampen the sensors
and reduce the performance substantially.
In order to reduce the disturbing effect of the magnets in dynamic measuring mode, we suggest
to mount the receiver at the largest possible distance. As a minimum distance for sensor type
IE42-30GS we require 40 mm.
N
Ax
N
S
Primary
flux
Conveyor rails
Conveyor rails
No secondary flux
Sensor
Transmitter
Sensor
Primary
flux
Ax: see sensor diagram
for the sensor
Ay
Ay
Ay: > 30 mm
40...60(70) mm
10 mm
40...60(70) mm
10 mm
Use plastic brackets with a cap of about 3 mm
to prevent bended sheets from damaging the
sensor
Receiver
