Danfoss AKS 41 Liquid Level Transmitter
Publication 9-45
Section 9
Page 12 of 18
Issue 1 : 10/11
Fig 6 4 to 20 mA Output Signal Damping
Signal damping is factory set at 15 seconds and can be altered within the
range 1 to 120 seconds. Setting the signal damping is performed while
the transmitter is operating.
(a)
With the transmitter in operation, press the calibration push-button
once for each second by which you want to increase the damping.
Example:
1 press = 1 second
2 presses = 2 seconds
120 presses = 120 seconds
121 presses = 120 seconds
(b)
After the first press the green LED stops ‘flashing’ and now only
illuminates when the button is pressed. 10 seconds after the last
press, the new signal damping value is saved in memory and the
green LED resumes ‘flashing’.
(c)
If signal damping is set too high, repeat the procedure.
Each time damping is set, damping starts at 1 second. For
example, to increase the damping from 15 to 25 seconds, this
cannot be done with 10 presses of the button, it is necessary to
press the button 25 times.
6.5.
Restore Factory Default Settings
To restore default settings, press the calibration push-button and keep it
depressed for a minimum of 20 seconds, until the green LED starts
‘flashing’. Release the push-button. When the LED starts flashing, reset
to factory default settings is completed.
7.
Commissioning
WARNING
The pressure and temperature parameters detailed in
Table 1 must NOT be exceeded when pressure testing
the plant.
When the plant is charged with refrigerant for the first time, leave the
isolating stop valves in the open position. If the level column has been
isolated for maintenance while the vessel to which it is fitted is still under
system temperature and pressure, open the stop valve at the top of the
column first of all, then open the valve at the bottom by a small amount to
allow the column to slowly fill with liquid.
During commissioning, check the probe/level column joint for leaks.
8.
Maintenance
No routine maintenance is required other than periodically checking that
the level indicated corresponds to the liquid level within the vessel. For
applications using R718 (water), if mineral deposits appear on the outside
of the transmitter tube, these should be removed.
4 to 20 mA
Output Signal
Liquid Level
Reaction Time
