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4. MOUNTING
The paddle must be fixed to the device by inserting the two attached pins before
the installation. When using a mounting plate, it must be mounted first, followed by
the paddle. The cable of cable-extended units can be secured the same way as
the pins.
To customize the cable extension’s length, cut the cable starting from the lower
end. First, remove the grub screws from the lower cable holder. Then cut the cable
to the required length. It is recommended to wrap adhesive tape around the wires
of the cable when cutting to prevent them from fanning out. After cutting the cable,
the holder must be assembled with the probe. If a rigid tube is attached to the unit,
it must be cut for the appropriate length before re-assembling!
Modifying the insertion length of an extended rod version is possible with the
optional sliding sleeve. It needs a 1½" BSP / NPT nozzle. The BSPT thread can be
screwed into a suitable BSP or an NPT threaded nozzle with a hex neck.
5. WIRING
EK
–, EH
–
–
devices:
EL
–, EM
–
–
devices:
6. OPERATION
The device must be connected to the protective grounding with its internal or
external grounding screw! After energizing the supply terminals, the unit is fully
operational.
-
If the paddle is rotating freely (not immersed in the medium), the status LED
is green. When the medium reaches the paddle and stops it from rotating,
the output microswitch changes its state, the motor stops, and the status
LED turns red.
-
If the LED of the device is blinking, the supply voltage is too low for the
device to operate
(EL
–, EM
–
–4M, –8M
devices).
To adjust the sensitivity of
EK
/ EH
devices, the following must be considered:
The spring provides reliable operation with mediums of different densities. The
default state of the sensitivity adjustment of the spring is position 1. This setting is
suitable for almost all applications. However, if the medium is wet, sticky, and
prone to form deposits on the paddle, it alters the sensitivity of the device
substantially, especially in horizontal or inclined positions. By adjusting the spring
tension (
SENSITIVITY 1–4
), the sensitivity of the device can be adjusted to the
desired level. Remember to clean the device regularly.
The sensitivity of
EL
/ EM
devices can be adjusted by loosening the
SWITCHING FORCE
adjustment screw, moving the sensitivity adjustment spring,
then retightening the switching force screw.
The purpose of the switching force screw is to ensure the proper operation with a
great variety of materials. The default setting for the screw is the weakest.
This setting may be used for all applications. However, if the medium is wet, sticky,
and prone to form deposits on the paddle, it alters the sensitivity of the device
substantially, especially in horizontal or inclined positions. By adjusting the
SWITCHING FORCE
, the sensitivity of the device can be adjusted better to suit
the application, device variant, and medium.
When the medium’s density or the grain size is not appropriate for the number of
blades, the medium may not be able to stop the rotation of the paddle. Therefore,
the output switch will not change its state despite the medium reaching the paddle.
By choosing the right paddle type and
SENSITIVITY
settings and
SWITCHING
FORCE
according to the density of the medium, reliable switching can be ensured
in most cases. A custom-sized paddle is required for very low-density materials.
Remember to clean the paddle regularly and occasionally the housing as
well!
Operation Status
Power Supply
Status LED
Paddle
Output
ON*
Green Rotates
NC
Red
Does not rotate
NO
OFF
Dark
Does not rotate
NC**
*EL
–, EM
–
–4M, –8M devices indicate low supply voltages by blinking the LED!
** The output of EK
/ EH
devices are not defined!
7. SPECIAL CONDITIONS OF SAFE USE
The device housing must be protected against dust!
The housing cover may only be removed only in a de-energized state and
only after the necessary waiting time!
(See: 2.2.1 Temperature data for ex certified models)
The power supply and the output terminals may only be connected to
electrical circuits with short-circuit protection.
The device may only be operated with a power supply specified in 2.2
Explosion Protection Data!
8. MAINTENANCE, REPAIR
The instrument does not require regular maintenance. If necessary possible dirt
deposited should be cleaned off. The warranty conditions are included in the
warranty card.
Before returning the device for repairs, it must be cleaned carefully, the parts in
contact with the medium that might contain harmful substances must be
decontaminated. Our official form (Returned Equipment Handling Form) must be
enclosed. Download it from our website www.nivelco.com. The device must be
sent with a declaration of decontamination. Please provide a statement in the
declaration that the decontamination process is completed, the device is clean and
free from harmful materials, and there are no hazardous substances on it.
9. STORAGE CONDITIONS
Ambient temperature:
−
30…+60 °C (
−
22…+140 °F)
Relative humidity:
max. 98%
eka7021a0600h_07
April 2021.
NIVELCO reserves the right to change technical data without notice!