Level limit switch
Series RF 3000
Technical Information / Instruction manual
page
Manual calibration - Calibration procedure - Uncovered and covered probe
1. Set Sensitivty range
Check for the required Sensitivity range (low or high) depending on the material to be
measured, use calibration guide on page 32.
Set the Sensitivity range in the Advanced Menu item "H", see page 30.
2. Note actual measured
capacitance (uncovered probe)
Ensure that the unit is properly mounted and the
material level is
well below the probe
.
In Measurement mode:
Note the actual measured capacitance as stated in the display.
If the actual measured capacitance is close to the limits of
what the electronic can measure (400pF with sensitivity
setting "Low" or 100pF with sensitivity setting "High"),
see Trouble shooting, page 37.
3. Note actual measured
capacitance (covered probe)
Ensure that the material level is
above the probe
.
For vertical mounting (rope version):
The material level shall cover the probe weight by 10-20cm (4-8").
In Measurement mode:
Note the actual measured capacitance as stated in the display.
4. Set Switchpoint
covered -> uncovered
Goto Advanced Menu item "K".
Set to the middle between capacitance of uncovered and covered probe as follows:
Switchpoint covered -> uncovered =
uncovered
(1)
+ 0.5 x (covered
(2)
- uncovered
(1)
)
(1)
Capacitance uncovered probe (see step 2 above)
(2)
Capacitance covered probe (see step 3 above)
With Low sensitivity range (Advanced Menu item "H"):
If the difference between uncovered and covered probe is smaller than 4pF, set either to High
sensitivity or use a more sensitive probe (longer active probe). For rope version only a setting
to High sensitivity range is possible.
With High sensitivity range (Advanced Menu item "H"):
If the difference between uncovered and covered probe is smaller than 1pF, use a more
sensitive probe (longer active probe). For rope version call factory.
* For remote version with remote cable length >10m (33ft) and outdoor installation the
difference between uncovered and covered probe must be at least 4pF (temperature drift).
6. Hysteresis
Advanced Menu item "L".
Factory setting is normally not required to be changed.
Unit is ready to work.
Return to measurement mode.
Advanced programming - Manual calibration
Note: Manual calibration must be set to ON (Advanced menu, item K)
A Capacitance uncovered probe
C Switchpoint covered->uncovered
D Hysteresis
E Switchpoint uncovered->covered
F Capacitance covered probe
Explanation of calibration procedure:
Capacitance
RFnivo
®
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2
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RF 3000 d
gi241014
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