6
RD8AA50
→
DKRCI.PD.SC0.A1.0 / 50H009
Danfoss A/S, (AC-DSL / MWA), 04 - 006
Technical leaflet
Liquid level transmittter, type AKS 41 / 41U
Signal damping
Signal damping is factory-set at 15 seconds.
This setting can be altered by activating the
calibration switch (see page 4).
The setting range is 1 to 10 seconds.
Settings can also be made whilst the system is
operating.
Procedure:
1.
Connect the supply voltage.
.
Push the calibration pushbutton once for each
second by which you want to increase the
damping.
Example:
1. push
⇒
1 sec.
. pushes
⇒
sec.
etc.
10. pushes
⇒
10 sec.
11. pushes
⇒
10 sec.
10 seconds after the last push, the value will be
saved in the memory and the green LED will start
flashing again.
After 10 seconds, a further push will start
1-second signal damping again.
(If the damping setting is set too high, restart the
procedure from step 1).
Calibration of the
AKS 41 / 41U
AKS 41 / 41U will not need calibration if it is
installed in refrigerant which is defined in AKS
41 / 41U and the ordered length corresponds to
actual refrigerant measuring range.
Calibration of the AKS 41 / 41U may be relevant:-
If the default setting does not fit and the max.
/min. calibration points have to be adjusted.
If the AKS 41 / 41U is used in a refrigerant, not
already defined in AKS 41 / 41U.
If the electronic head is replaced on an
existing AKS 41 / 41U sensor.
Usually the min. calibration point is chosen to be
4 mA and the max. calibration point to be 0 mA,
but it is also possible to calibrate the transmitter
at other calibration points.
This opportunity can be useful when cali brating
on a plant with no possibility of bringing the level
to the limit points.
Adjusting the min. /max. calibration points:
Min. calibration:
1.
Bring the refrigerant liquid level to desired
minimum level.
.
Press the calibration pushbutton and keep it
activated in approx. 5 seconds, until green LED
stopps flashing.
3.
Activate, within the next 10 seconds, the
calibration pushbutton once
(If calibration
pushbutton is not activated within 10 seconds,
it will automatically leave calibration mode
and return to normal operation)
Green LED is ON in a few seconds, and then
flashing.
Output is now 4 mA and AKS 41 / 41U is in
normal operation
Max. calibration:
1.
Bring the refrigerant liquid level to desired
maximum level.
.
Press the calibration pushbutton and keep it
activated in approx. 5 seconds, until green LED
stopps flashing.
3.
Activate, within the next 10 seconds, the
calibration pushbutton twice
(If calibration
pushbutton is not activated within 10 seconds,
it will automatically leave calibration mode
and return to normal operation)
Green LED is ON in a few seconds, and then
flashing.
Output is now 0 mA and AKS 41 / 41U is in
normal operation
Continued next page....
Default factory setting is:
0% (AKS 41 / 41U free of liquid) output signal: 4 mA
100% (AKS 41 / 41U fully covered by liquid) output
signal: 0 mA
The max. /min. points can be set to any value.
