PRODUCT DESCRIPTION
DOL 20R is a capacitive sensor for detecting
loose and solid materials. The sensor has a 5-
way connection, power supply and a
potential-free relay with NC and NO outputs.
The sensor comes as standard with two
trimmers for adjusting the sensitivity and a
delayed disconnection of between 0 and 600
seconds. See the information on the product
label for special variants.
APPLICATIONS:
•Level control in silos,
containers and feed lines.
•Emptying/filling control.
•Alarms for feed
accumulation/errors in
transport systems, e.g. worm
conveyor.
MOUNTING METHODS, FIG. 1:
A. Measurement through plastic material:
The sensor with mounting clip can be
used for plastic types with a minimum
of moisture absorption.
B. Measurement in recessed holes:
Mounting clips can be mounted outside
the hole.
Fit the sensor so that it is protected from the
build-up of dust and the impact of water on
the detection area of the sensor, including
condensation.
If there is significant wear, the sensor should
be mounted behind a wear plate made of a
suitable plastic material.
MOUNTING, FIG. 2:
The sensor is not side sensitive, but to avoid
incorrect detection as a result of uncertainty
with regard to mounting, it is best to keep the
sensor away from any metal components, see
the dimensions in figure 2. (5 mm gap)
ELECTRICAL MOUNTING, FIG. 3:
The sensor must be connected as per the
diagram in figure 3.
FUNCTIONAL DESCRIPTION, FIG. 4:
When there is material in front of the sensor,
the output is in the reference position (NO).
When the material disappears, the timer
starts, and the output will change to (NC)
after the set delay.
The status of the sensor is indicated with a
yellow LED. Other functions are possible for
special variants.
TECHNICAL DATA:
Supply voltage: 90–250 VAC
Frequency: 50–60 Hz
Relay contact max. 250 VAC
Ohm load max. 1 A
Inductive load max. 0.5 A
Minimum current at 12 VDC 100 mA
Operating temperature: -20 - +70 °C
(More information is available under
Technical Info at www.dol-
sensors.com).
SENSOR DIMENSIONS, FIG. 5
Cable: 2 m
Conductor dimensions: 5 x 0.5 mm2
MAINTENANCE:
There is no need for maintenance.
However, it may be necessary to clean
around the sensor if it is used in a dirty
environment..
