8
Adjusting of the switch response time potentiometer P2
Adjust the switch response time with the potentiometer P2 according to your requirement between the range
of 0.25 and 5 seconds. By turning P2 to left stop, the delay will be 0.25 seconds. At right stop the delay time
will be 5 seconds. Thereby a fluttering of the relay can be stopped, which have been produced by critical
adjustment of the sensitivity.
Measuring materials with low bulk density or low DK value
In order to detect threshold levels reliably even for materials with low bulk density or low DK values, the
transmitter and receiver unit can also be installed on one side of the pipe (see chapter 4.3, Fig. 2).
In this installation variant, the opposite metallic wall is used as a reflection surface for the microwave. In
this case the orientation of transmitter and receiver must not be exactly parallel to each other. Otherwise
there is a risk that the emitted microwave will not be reflected to the receiver. A slightly angled positioning is
required. Depending on “angle of dip = emergent angle”, a slightly angled positioning is required depending
on the distance of the reflector wall. The distance travelled by the microwave is approximately twice as long
with this arrangement compare to an normal installation. This mounting option can also be use in case of
less space on one side of the container. The settings of the measuring point are then made as described in
chapter 6.
7. Fault clearance
Error
Cause
Action
No reaction on relay contact
when level reached
Low density of material
Measuring point set to maximum
sensitive:
- P1 right stop
- P2 left stop
- S2 OFF
Check installation situation
Low DK-value of material
Transmitter and receiver doesn‘t
see each other
Red LED 1 doesn‘t light up
No power supply
Check power supply (24 V DC)
Check installation situation
Transmitter and receiver doesn‘t
see each other
8. Notice
•
A minimum distance of 15 cm to adjacent walls is recommended to avoid disturbing reflections.
•
In case of less installation space or material with low bulk density or low DK-value, installation on one
side of the container is possible.
•
Various process adapters are available to protect the sensor, observe ATEX zones or solve difficult
process conditions.
