Level limit switch
Series RF 3000
Technical Information / Instruction manual
page
Advanced programming - Manual calibration
Manual calibration is recommended for special purposes.
The numbers in the table below are applicable for most applications. Some critical applications (e.g. excessive buildup, special
mounting) may be considered different.
A proper selection of the active probe length is necessary in any case to reach a satisfactory change of capacitance between
uncovered and covered probe, see recommendations in the selection list (pricelist). The table below is based on a proper active probe
length.
• Calibration with uncovered probe only:
This method is more easy to realise than calibration with uncovered and covered probe and thus recommended to be done if ever
possible. It is applicable for higher DK values which give a higher change of capacitance between uncovered and covered probe. The
DK value of the material is required to be known to be able to set the sensitivity range and the increase to switchpoint. See external
list for dielectric constant (DK) of different materials.
• Calibration with uncovered and covered probe:
This method is most safe, since it sets the switchpoint in the middle between uncovered and covered probe. This ensures the max.
distance to both uncovered and covered probe and thus ensures the max. tolerance against e.g. material buildup.
It is required for lower DK values which give a lower change of capacitance. The DK value of the material is roughly required to be
known to be able to set the sensitivity range. See external list for dielectric constant (DK) of different materials.
Manual calibation - Calibration guide
Manual Calibration - Calibration guide
DK
Sensitivity
range
Calibration:
Uncovered probe
only
Increase to
Switchpoint
Calibration:
Uncovered and
covered probe
<1.5
-
-
-
-
1.5 .. 1.6
High
-
-
A
1.7 .. 1.9
High
B
+1 pF*
C
2.0 .. 2.9
Low
B
+2 pF
C
3.0 .. 4.9
Low
B
+4 pF
C
5.0 .. 10
Low
B
+10 pF
C
>10
Low
B
+15 pF
C
Calibration prodedure
see page 33
Calibration
prodedure
see page 34
A = Required
B = Recommended (most simple calibration method)
C = Possible as an alternative
- = Not applicable
* Not possible with remote version with remote cable length >10
m (33 ft) and outdoor installation
(temperature drift).
RFnivo
®
1
2
3
4
5
6
7
8
9
10
11
12
RF 3000 f
gi241014
32
