The Pointek Cls200 Electrode - Siemens Pointek CLS200 Operating Instructions Manual

Specifications: standard model
See
product nameplate on the enclosure, for details of your particular instrument.

The Pointek CLS200 electrode

The Pointek CLS200 electrode is the primary sensor of the system. It supplies the
electrical capacitance value. The reference is the environment at the time of setup.
The design of the Pointek CLS200 probe makes it very sensitive to changes in
capacitance in the immediate vicinity of the antenna tip.
R = Ratio between initial
capacitance and total
capacitance
Ca = Initial capacitance of the
1
CLS200
Ca = Initial capacitance (air)
2
between the probe and the
installation
Cm = Capacitance increase of the
1
CLS200 caused by product
replacing air
Cm = Capacitance increase
2
between the probe and the
installation caused by
product replacing air.
The initial capacitance of the CLS200 itself makes it possible to operate the CLS200 in a
plastic tank where the Ca
grounded metal tank will reduce the effects of external influences on the sensor.
The sensor can be set to detect either the change in capacitance as the product level
approaches the antenna tip, or the change when the probe becomes covered.
7ML19985JH01 Pointek CLS200/300 Standard – INSTRUCTION MANUAL
, page 6, for performance information; also check the
R = Ca
Ca
and Cm terms would disappear. However, a properly
2 2
+ Ca
1 2
Ca + Ca + Cm + Cm
1 2 1 2
Measuring
Circuit
Cm
1
1
Ca
2
Cm
2
Page 33