Level limit switch
Series RF 3000
Technical Information / Instruction manual
page
Push button calibration - Calibration procedure - Uncovered and covered probe
1. Ensure material level is well
below the probe.
Ensure that the unit is properly mounted and the
material level is
well below the probe
, since the unit
will calibrate to an uncovered probe.
2. Press CAL button
for 3 seconds
Display states "CAL", the red LED is blinking.
Wait until calibration is finished (ca. 10 seconds). Then display states the actual measured
capacitance followed by "u" for "Probe
u
ncovered".
Note: If "Code" is displayed, a Lock Code is required. Set the code number with the arrow
buttons and confirm with the Menu button. Then press again the CAL button for 3 sec to start
calibration.
If other statements on the display are present, see Trouble shooting, page 37.
3. Note actual measured
capacitance (uncovered probe)
Note the actual measured capacitance as stated in the display for uncovered probe.
4. Note actual measured
capacitance (covered probe)
For vertical mounting (rope version) the material level shall
cover the probe weight by 10 - 20 cm (4 - 8").
Note the actual measured capacitance as stated in the
display for covered probe.
5. Set Sensitivity
Calculate the capacitance difference between uncovered and covered probe.
Set sensitivity as follows (Quickstart Menu item "D"):
Horizontal mounting
Vertical mounting (rope version)
Capacitance
difference
uncovered-covered
Sensitivity*
Capacitance
difference
uncovered-covered
Sensitivity**
0.8 .. 1.5 pF
1.5 .. 3 pF
3 .. 6 pF
6 .. 15 pF
15 .. 23 pF
23 .. 38 pF
38 .. 53 pF
> 53 pF
0,5 pF***
1 pF***
2 pF
4 pF
10 pF
15 pF
25 pF
35 pF
0.5 .. 1.0 pF
1.0 .. 2 pF
2 .. 4 pF
4 .. 10 pF
10 .. 15 pF
15 .. 25 pF
25 .. 35 pF
> 35 pF
0.5 pF***
1 pF***
2 pF
4 pF
10 pF
15 pF
25 pF
35 pF
* The difference uncovered to covered should be well above the setted sensitivity (ca. >50%).
** The difference uncovered to covered does not need to be above the setted sensitivity, since
with raising material the capacitance will increase and thus lead to a save switching.
*** Not possible with remote version with remote cable length >10 m (33 ft) and outdoor
installation (temperature drift).
Note: If different materials needs to be measured in the same bin without recalibration, the
Sensitivity must be set for the material with the lowest DK.
Unit is ready to work.
Quickstart
Capacitance
A Capacitance Uncovered probe
B Sensitivity
C Switchpoint
D Capacitance Covered probe
Explanation of calibration procedure:
RFnivo
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RF 3000 f
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